Research team

Electron microscopy for materials research (EMAT)

Expertise

- Materials study by means of electron microscopy

Unscrambling mixed elements with single atom sensitivity using quantitative scanning transmission electron microscopy. 01/10/2015 - 30/09/2019

Abstract

The goal of this project is to develop and design a powerful method in order to unscramble mixed element nanostructures at the atomic scale in three dimensions (3D). Therefore, novel quantitative measurement tools will be combined with aberration corrected scanning transmission electron microscopy (STEM). Visualisation at the atomic scale in 3D using state-of-the-art STEM is nowadays possible for modellike systems with 1 type of chemical element present. For this purpose counting the number of atoms in each projected atomic column is of great help. However, precise determination of the atomic structure in 3D of hetero-nanostructures is currently limited because of the lack of methods to quantitatively unscramble mixed elements. In this project, atom-counting will be performed for technologically important nanostructures that are more complex than model systems, including systems with adjacent atomic number Z such as Pt-Au, Fe-Co, and Ge-Ga-As. The aim is to quantitatively characterise the number of atoms and atom types of mixed element nanostructures with single atom sensitivity. This highly challenging objective will be reached by a unique combination of physics-based modelling and advanced statistical methods. The outcome of this project will deliver the necessary input for understanding and predicting the properties of complex hetero-nanostructures and to guide the development of new nanomaterials.

Researcher(s)

Research team(s)

Nano consortium of excellence. 01/01/2015 - 31/12/2019

Abstract

The NANO consortium of excellence represents the internationally renowned expertise in nanoscience at the University of Anwerp. It consists of three participating groups that are international leaders in their subfield: EMAT, CMT and PLASMANT. The consortium joins forces towards a uniform communication and collaboration in order to further strengthen the international position of the nanosciences at the University of Antwerp.

Researcher(s)

Research team(s)

Computational modeling of materials. 01/01/2014 - 31/12/2018

Abstract

This is a fundamental research project financed by the Research Foundation - Flanders (Fonds voor Wetenschappelijk Onderzoek Vlaanderen (FWO)). The project was subsidized after selection by the FWO-expert panel.

Researcher(s)

Research team(s)

Quantifying inflow uncertainties for CFD simulations of dispersion in the atmospheric boundary layer. 01/01/2014 - 31/12/2017

Abstract

The objective of this project is to develop a tool that predicts air quality levels in urban environments with quantified uncertainty intervals that account for the atmospheric variability. It is an agreement between the University of Antwerp and IWT

Researcher(s)

  • Promotor: Van Tendeloo Staf
  • Co-promotor: Gorlé Catherine
  • Fellow: Garcia Sánchez Clara

Research team(s)

Structure, valency and bonding at atomic scale in lowdimensional nanomaterials. 01/10/2013 - 31/01/2016

Abstract

This project will focus on the application of high resolution imaging and spatially resolved spectroscopy in a (S)TEM to three specific classes of nanomaterials; nanoscale oxides, superconducting nanocrystalline diamond and hybrid metal-organic frameworks (MOFs). Key research questions in each of these domains will be addressed, in collaboration with renowned materials synthesis labs.

Researcher(s)

Research team(s)

Scientific research in the electronmicroscopy. 01/09/2013 - 31/08/2014

Abstract

This is a fundamental research project financed by the Research Foundation - Flanders (FWO). The project was subsidized after selection by the FWO-expert panel for the sabbatical year of Van Tendeloo.

Researcher(s)

Research team(s)

Revealing the source of emergent properties in complex oxides via direct imaging of charge/orbital/spin ordering. 01/01/2013 - 31/12/2016

Abstract

Oxides form a challenging subgroup of materials for tomorrow's technology and can be applied in fuel cells for greener cars, as faster nonvolatile memory that can reduce power consumption in computers, as ultrasensitive magnetic sensors for medical applications and many more. The range of physical properties of oxides is enormous and can even be expanded by bringing different oxides in contact with each other where so-called emergent properties occur at the interface. The reason why this happens is still heavily debated but naturally occurring ordering phenomena play an important role. In this project we propose to study such ordering of e.g. local atomic charges or atomic orbitals or the spin of atomic electrons with transmission electron microscopy. This is a fundamentally more direct method of studying this topic as compared to commonly used techniques which only give information on the average ordering over large volumes of material. It is exactly this direct visualization that will allow us to study the ordering phenomena near interfaces and defects in crystals in order to better understand the physics and properties of oxide devices.

Researcher(s)

Research team(s)

Modified iron oxide materials for hydrogen production studied by operando XAS and TEM. 01/01/2013 - 31/12/2016

Abstract

This project aims at an atomic scal study of interaction between iron oxide and modifying promoters, added to inhibit deactivation in cycling processes. This implies looking at the materials during heating or reaction with nano-scale techniques such as operando XAS and in situ TEM.

Researcher(s)

Research team(s)

ESTEEM 2 - Enabling science and technology through European electron microscopy. 01/10/2012 - 30/09/2016

Abstract

The ESTEEM2 project integrates European electron microscopy laboratories in a range of activities that provide a service to a range of physical science disciplines. This European Research Infrastructure will offer service provision that enables users to access the most advanced electron microscopes in an integrated fashion.

Researcher(s)

Research team(s)

Turbulence and turbulent mixing: from uncertainty quantification towards statistical models. 01/10/2012 - 30/11/2014

Abstract

The overall objective of the present proposal is the advancement of the predictive capabilities of multi-physics flow simulations. Turbulence and turbulent mixing are fundamental processes in the vast majority of multi-physics applications and the turbulence models currently used within the engineering community lack predictive capabilities beyond the specific conditions for which they were designed. I therefore intend to specifically focus on the epistemic uncertainty quantification (EUQ) of existing turbulence and turbulent mixing models.

Researcher(s)

Research team(s)

Francqui Chair 2012-2013 Prof. Johan Martens. 01/10/2012 - 30/09/2013

Abstract

Proposed by the University, the Francqui Foundation each year awards two Francqui Chairs at the UAntwerp. These are intended to enable the invitation of a professor from another Belgian University or from abroad for a series of ten lessons. The Francqui Foundation pays the fee for these ten lessons directly to the holder of a Francqui Chair.

Researcher(s)

Research team(s)

European development of Superconducting Tapes: integrating novel materials and architectures into cost effective processes for power applications and magnets (EUROTAPES). 01/09/2012 - 28/02/2017

Abstract

The EUROTAPES project will address two broad objectives: 1/ the integration of the latest developments into simple conductor architectures for low and medium cost applications and to deliver +500m tapes. Defining of quality control tools and protocols to enhance the processing throughput and yield to achieve a pre-commercial cost target of 100 €/kAm. 2/ Use of advanced methodologies to enhance performance (larger thickness and Ic, enhanced pinning for high fields, reduction of ac losses, increased mechanical strength).

Researcher(s)

Research team(s)

Functional supramolecular systems (FS2). 01/04/2012 - 31/12/2017

Abstract

The IAP Functional Supramolecular Systems will identify and demonstrate new fundamental concepts in light conversion and manipulation, in catalysis and separations, and in design of responsive and adaptable systems, based on concepts of supramolecular assembly and function.

Researcher(s)

Research team(s)

Influence of coating silica nanoparticles in the electrolyte degradation in Li-ion batteries. 01/11/2011 - 29/02/2016

Abstract

This project represents a formal research agreement between UA and on the other hand Umicore. UA provides Umicore research results mentioned in the title of the project under the conditions as stipulated in this contract.

Researcher(s)

Research team(s)

Novel active protection systems on metals (NAPROM). 01/03/2011 - 30/05/2015

Abstract

The objective of NAPROM is to develop novel active corrosion protection coatings for metals utilizing self-healing organic coatings (employing different healing mechanisms) and corrosion inhibitors (with different delivery mechanisms), aiming at an extended coating life-time and an improved active corrosion protection.

Researcher(s)

Research team(s)

ESMI - European Soft Matter Infrastructure. 01/01/2011 - 31/12/2015

Abstract

The central objective of this ESMI project is to create a top-level interdisciplinary research infrastructure available to a broad European materials research community. This is of crucial importance to the EU in view of the European strategy for nanosciences and nanotechnology and its implementation report that identifies "a lack of leading interdisciplinary infrastructures". ESMI offers the most important experimental and synthesis techniques and combines world-class infrastructures with cutting edge scientific expertise through a sophisticated networking programme.

Researcher(s)

Research team(s)

Diamond shadow and luster. Giving new meaning to diamond with the help of new technologies. 01/01/2011 - 31/12/2012

Abstract

This project relies on a cross-over between artistic jewellery creation on the one hand and innovative materials science and technology on the other. Since observation is highly subjective, the way of presenting "things" can evoke very different feelings. In this project, classical jewellery materials, such as diamond and gold, will be looked at differently, mounted differently and we will experiment with new techniques to change typical colours and connections.

Researcher(s)

Research team(s)

IFOX - Interfacing Oxides. 01/12/2010 - 30/11/2015

Abstract

The goal of the IFOX project is to explore, create and control novel electronic and magnetic functionalities, with focus on interfaces in complex transition metal oxide heterostructures to develop the material platform for novel 'More than Moore' (MtM) and 'beyond CMOS' electronics, VLSI integratable with performance and functionality far beyond the state-of-art.

Researcher(s)

Research team(s)

Aberration-corrected (S)TEM-EELS characterization of 0-D nanomaterials. 01/10/2010 - 30/09/2013

Abstract

We will study the properties of nanoparticles using advanced transmission electron microscopy (TEM) techniques performed in a state-of-the-art aberration-corrected TEM. By harnessing the full potential of aberration-corrected TEM, we will be able to image the morphology and surface structure of nanoparticles down to the atomic level in all three dimensions. Aberration correction will allow these analyses to be performed at low acceleration voltages, meaning beam-sensitive materials and surface functionalisation can be imaged for the first time.

Researcher(s)

Research team(s)

Surface science through advanced electron microscopy. 01/10/2010 - 30/09/2011

Abstract

For materials with decreasing dimensions the surface to bulk ratio will become more and more important. Since the properties of a material are often determined by its surface (e.g. painting can prohibit rust), surface characterization will become extremely important when the dimensions are in the nanometer range. Such nanomaterials can be studied chemically as well as structurally through advanced electron microscopy. The challenge of this project is to study the surface of nanomaterials (hard matter, mostly metallic nanoparticles) in contact with soft matter (polymers, nanotubes, organic molecules, ¿). This is a very delicate experiment and therefore one has to find the most ideal set up for recording and analysis. However we have good hope that this can be realized in the first part of this project with the help of the experienced EMAT group. In the second part of the project we will apply the optimized technique to analyze the interaction between porous materials and metallic nanoparticles and to functionaled nanomaterials.

Researcher(s)

Research team(s)

The active site: from catalysis to reactor. 01/01/2010 - 31/12/2019

Abstract

The project involves a collaboration between chemists and chemical engineers in the field of heterogeneous catalysis. The aim is to characterize and to fully understand the active site of the catalyst on the atomic level, in order to build catalysts with improved properties in a reactor in the chemical industry.

Researcher(s)

Research team(s)

Counting Atoms in Nanomaterials (COUNTATOMS). 01/01/2010 - 31/12/2014

Abstract

This project represents a formal research agreement between UA and on the other hand EU. UA provides EU research results mentioned in the title of the project under the conditions as stipulated in this contract.

Researcher(s)

Research team(s)

Study of the formation of zeolites and porous materials by electrondiffraction. 01/01/2009 - 31/12/2013

Abstract

This project did and will give further insight into the molecular mechanisms of silica structuring to enable design and synthesis of tailor made materials. Zeolite formation has been discovered to be based on self-organization of nanoscopic precursor species. Shear and convection have strong effect on this self organization process, which only can be studied under microgravity conditions.

Researcher(s)

Research team(s)

PRIME Electron Microscope. 01/12/2008 - 31/12/2018

Abstract

This project represents a formal research agreement between UA and on the other hand a private institution. UA provides the private institution research results mentioned in the title of the project under the conditions as stipulated in this contract.

Researcher(s)

Research team(s)

Center of excellence NANO. 01/01/2008 - 31/12/2014

Abstract

This project represents a research contract awarded by the University of Antwerp. The supervisor provides the Antwerp University research mentioned in the title of the project under the conditions stipulated by the university.

Researcher(s)

Research team(s)

Increase of new nanostructures with cluster deposition. 01/01/2008 - 31/12/2011

Abstract

We aim to investigate two routes towards new materials by deposition of nanoclusters with a very specific composition and by using nanoclusters as building blocks in a so far unexplored process of self-assembly, namely the glancing angle deposition of nanoclusters. We will investigate the formation and growth processes, perform a thorough structural characterization of the nano-assembled films and study a number of key properties of these novel materials.

Researcher(s)

Research team(s)

Model-based electron microscopy: From visual interpretation of the observations toward precise measurements of physical structure parameters. 01/10/2007 - 30/09/2009

Abstract

The aim of this project is to realize a breakthrough toward quantitative, model-based electron microscopy so as to obtain precise measurements of physical structure parameters from the observations. From theoretical as well as from experimental point of view, this is the project's goal. On the one hand, this means that the methodology will be further improved and optimized and on the other hand, it will be shown that precise measurements are attainable in practice by applying the methodology to experimental observations.

Researcher(s)

Research team(s)

Growth of Complex Oxides. 01/06/2007 - 31/05/2012

Abstract

The project targets to understand the growth of complex oxide thin films by a detailed characterisation and modelling of the process. The relaxation between a number of layer properties and intrinsic properties of the layers will be evaluated.

Researcher(s)

Research team(s)

Quantum effects in clusters and nanowires. 01/01/2007 - 31/12/2011

Abstract

This project represents a formal research agreement between UA and on the other hand the Federal Public Service. UA provides the Federal Public Service research results mentioned in the title of the project under the conditions as stipulated in this contract.

Researcher(s)

Research team(s)

Growth, characterisation an simulation of nanocrystalline and ultrananocrystalline PE-CVD diamond films. 01/01/2007 - 31/12/2010

Abstract

The aim of the project is the experimental and theoretical study of the growth of nanocrystalline and ultrananocrystalline PE-CVD diamond films, as well as the structural, morphological and (opto)electronic characterisation of these films. The project can be divided in three main parts, which are strongly correlated: A. deposition of NCD and UNCD films B. structural, morphological and (opto-)electronic characterisation C. simulation of the deposition of NCD and UNCD films

Researcher(s)

Research team(s)

The beauty of the invisible: artistic interpretations of nanostructures. 01/01/2007 - 31/12/2008

Abstract

The aim of this project is to bridge the gap between art and science. The starting point is the atomic world and the world of nanotechnology as observed through the electron microscope. Dork Vander Eecken will use these observations as his inspiration source for his graphical work. The project will result in a comon book and portfolio where art and science will touch each other. Iit is the aim to inspire young artists through lectures and workshops.

Researcher(s)

Research team(s)

The real structure and microheterogenecity of complex vanadates and niobates studied by high-resolution electron microscopy. (N. TARAKINA, Rusland) 01/11/2006 - 31/10/2007

Abstract

Researcher(s)

Research team(s)

Advanced electron microscopy of superconducting high Tc materials. (F. BEN AZZOUZ, Tunesië) 01/11/2006 - 30/04/2007

Abstract

Researcher(s)

Research team(s)

Structural and chemical characterisation of nanostructured materials: from qualitative to quantitative, from two to three dimensions. 01/10/2006 - 30/09/2010

Abstract

During the last 20 years, a strong evolution can be observed in the demands that are imposed on microscopic and nanoscopic characterization methods. Newly developed materials are becoming increasingly complex with respect to their chemical composition and structure on the micro/nanoscopic level. This has been the driving force for recent and spectacular developments in the world of transmission electron microscopy (TEM). Besides the race towards a better resolution using aberration corrected microscopes, directly interpretable results are obtained using advanced techniques such as exit wave reconstruction and high angular annular dark field scanning transmission electron microscopy (HAADF-STEM). However, these techniques have often been used to obtain results in well known systems such as Si and Au. Most technological applications however require much more complex materials. Apparently, applying the techniques mentioned above in order to solve problems relevant for solid state physics is not straightforward. This challenge forms the goal of our project.

Researcher(s)

Research team(s)

Electron microscopy for the improvement of the academic competitiveness in Peru. 01/07/2006 - 30/06/2011

Abstract

The low competitiveness of Peru is one of the major development problems of the County. One of the important causes of the low competitiveness is the lack of a solid scientific and technical capacity in the county that can allow the creation of the research - development - innovation chain. Mining & metallurgy is the main activity of the country, it provides the 50% of the county revenues; however no research activity is developed in this sector relthed to materials characterization and products are basically exported as raw material without added value. The current project aims to contribute in the establishment of a research group with an intemàtional level in electron microscopy for materials research with emphasis in nanoscience. The Group will operate at PC-TIM and ]PEN improving the Peruvian scientific production through the publication of scientific & technical papers and training students and professionals in research activities at international standard levels. At the end of the project we expect to have a critical number of researchers in order to make sustainable the research activities in the field, As collateral mid term result, it is expected that the research team will gain prestige and credibility in order to pay attention from the national industry, deserving financial support for research and educational activities.

Researcher(s)

Research team(s)

ESTEEM - Distributed European Infrastructure of Advanced Electron Microscopy for Nanoscience. 01/07/2006 - 30/06/2011

Abstract

This project represents a formal research agreement between UA and on the other hand EU. UA provides EU research results mentioned in the title of the project under the conditions as stipulated in this contract.

Researcher(s)

Research team(s)

NanoSoc: Nanotechnologies for tomorrow's society. 01/02/2006 - 30/06/2010

Abstract

Researcher(s)

Research team(s)

Understanding materials at the (sub)nano level scale. 01/01/2006 - 31/12/2007

Abstract

Researcher(s)

Research team(s)

Synthesis, structure and properties of new low-dimensional manganites. 01/01/2006 - 31/12/2007

Abstract

A first goal of the project is to extend the knowledge on the complicated relationships between the chemical composition, crystal structure, local structure, electronic correlations and magnetic properties of complex oxides. As a second goal we want to develop modern synthesis paths towards new materials based on complex transition metal oxides with promising practical properties, in particular colossal magnetoresistance (CMR). The main steps to achieve this will be the synthesis of new compounds, the detailed structural investigation with various diffraction techniques including transmission electron microscopy (TEM), X-ray diffraction (XRD) and neutron diffraction (ND), and the characterization of the physical properties by magnetic and electric transport measurements. The choice of possible systems for investigation was based on crystal chemistry considerations, on known relationships between the crystal structure and the properties and on existing analogies with complex oxides of other transition metals.

Researcher(s)

Research team(s)

Study with transmission electron microscopy of semi-conductive nanostructures. 01/01/2006 - 31/12/2007

Abstract

Researcher(s)

Research team(s)

Controlling the critical parameters in superconductors : nanograins, clusters and pinning arrays. (V. MISKO, Moldavië) 01/01/2006 - 31/03/2007

Abstract

Nanostructured superconductors play an important role in nanoscience since they provide a unique opportunity to apply quantum-mechanical principles to obtain specific superconducting properties needed for applications, by using nanoscale confinement of the condensate and flux to modify and control the coherent quantum ensembles of correlated eIectrons or holes responsible for the appearance of superconductivity. Designing specific material properties through the application of quantum mechanical principles is "quantum design" - a key idea in nanoscience. Superconductors, with their inherent quantum coherence over even macroscopie scale are in that respect superior to semiconductors, magnetic or normal metallic nanomaterials, where quantum coherence is much more difficult to achieve. In that respect nanostructured superconductors is the best choice for the demonstration of applicability of quantum design to tailor specific properties of materials at nanoscale. The two key properties: the absence of resistance to the dc current flow and quantum coherence of the condensate make superconductors extremely promising materials for nano-technologies and for various applications in micro- and nano-electronics, electrotechnics and as ultra-sensitive field, current and voltage sensors. Due to an intrinsic coherence of the condensate, superconducting eIements are primary candidates for developing physical realizations of the qubits for quantum computing. The possibiIities of the practical applications of superconducting materials, however, are limited by their critical parameters: temperature, field, and current. Remarkably, superconductors are materials where an artificial nanoscale modulation cao drasticalIy improve their critical parameters. In this project, we wilI study the size dependence of the superconducting properties and the critical parameters and we wilI investigate the electron pairing correlations at the nanometer scale.

Researcher(s)

Research team(s)

Multidimensional definition of structure by means of electron diffraction. 01/01/2006 - 31/12/2006

Abstract

Researcher(s)

Research team(s)

W&T cooperation: scholarship A. OLENEV, Rusland. 05/01/2005 - 04/01/2006

Abstract

Researcher(s)

Research team(s)

Structural and chemical characterization of materials at the micro- and nanometer scale. 01/01/2005 - 31/12/2014

Abstract

The study of surfaces, interfaces, microscopic and even nanoscopic structures becomes more and more important in the characterization of very diverse materials in metallurgy, microelectronics, optoelectronics, photographic sciences etc. This characterization is mostly carried out using so-called (micro)beam techniques. By interaction of a "primary" beam (electrons, photons, ions), "secondary" signals are generated at the material's surface (electrons, photons, ions, neutrals), which contain information on the composition and/or structure of the material's surface. The various techniques differ in the kind of information, i.e. information depth, depth resolution, possibility to measure depth profiles, lateral resolution, compatibility with certain types of materials (electrical insulator vs. conductor, refractory vs. labile material), destructive or non-destructive character and type of information (elemental, istopic, molecular) It is clear that one method cannot answer all questions. Moreover, the required equipment is very expensive It is not possible for one research group to have in-house all infrastructure, accessories, know-how, know-why, and experienced personnel. Cooperation is therefore a must. The scientific research community aims at facilitating mutual consultations, exchanges and access to complementary equipment for solving a variety of problems, introduced by one or more of its members.

Researcher(s)

Research team(s)

Design and structural characterisation of new nanoporous materials. 01/01/2005 - 31/12/2008

Abstract

New nanoporous siliceous and non-siliceous materials with a combined micro- and mesoporosity will be developed and catalytically activated with transition metaloxides following several innovative procedures. A combination of macroscopic techniques and electron microscopy will be used to fully characterize the catalysts. TEM will determine the morphology and the pore structure and tries to locate the active metal sites in the porous catalyst matrix. This information is essential to understand the relation between synthesis strategy, catalyst structure and catalytic performance.

Researcher(s)

Research team(s)

Conductimetric gas sensors based on electrically conducting oligomers : physical chemistry and morphology of the active layer. 01/01/2005 - 31/12/2008

Abstract

To stimulate research on the macroscopic or bulk description of sensor materials, in which the microcrystalline layer, of which the bulk properties largely determine the precise activity of the resulting gas sensor, occupies a central position, a consortium of four research groups is created in which expertise in the field of the synthesis of new sensor materials and the electrochemical procedure , which forms the basis of the construction of sensors, is combined with know-how in the field of morphological studies on (organic) materials using nitrogen physisorption methods and electron microscopy, and with expertise in the field of the measurement of phase equilibrium partition coefficients between two phases.

Researcher(s)

Research team(s)

    Polonaise 01/01/2005 - 31/12/2006

    Abstract

    The idea of this project is to break the myth that art and science (in the broad sense) are totally independent worlds. It is our idea that art and science can mutually and positively influence each other. This was the case for e.g. Da Vinci and Escher; there is no reason why this should not happen today. This project wants to bring different forms of art and science closer together.

    Researcher(s)

    Research team(s)

    BIPOM : Design of Bimodal Porous Materials for Catalysis and Sorption. 01/02/2004 - 31/01/2009

    Abstract

    The partners involved in this project aim at knowledge development with economic finality in the area of molecular separation and catalysis. This knowledge development will be based on a new material concept and will be implemented in a broad range of applications. The new concept concerns the development of a generation of catalysts, adsorbents and membranes using the directed assembly of nanoblocks into a variety of macroscopic materials under influence of supramolecular forces. This project further aims at the development of reliable and suitable instruments for computer supported innovation, evaluation of new chemical processes and catalysts, membranes or adsorbents.

    Researcher(s)

    Research team(s)

    Synthesis and characterisation of a new family of hierarchical materials : stacking and coupling of zeolitic nanoslabs into tridimensional mosaic structures. 01/01/2004 - 31/12/2007

    Abstract

    Because of their microporosity, zeolite materials play an important role in a number of molecular processes such as heterogeneous catalysis, molecular separation, adsorption and ion exchange. Materials with a fixed porosity are also important for other applications, such as molecular electronics, non-linear optics and biochemistry. Most zeolites are based on silica and alumina. Traditionally the synthesis of zeolites takes place with the hydrothermal gel method. When the hydrogel is heated, the zeolite crystals nucleate and grow till micron size particles. The selectivity for the crystallisation of the requested zeolite is favoured by adding the appropriate organic structure directing molecules called "templates", which occupy the pore volumes. The microporosity is obtained by evacuation of these template molecules from the inorganic framework. Nanoplates are organic-inorganic hybrid particles with a strong tendency to self organisation. By adding the secondary template molecule the initial self organisation is perturbed and a new organisation is introduced. The aim of this project is to try to understand the interaction mechanism between nanoslabs as well as the interaction with secondary templates. If we can do so, we can try to interfere and make 'customer-made' hierarchic materials. The first level of organisation is at the level of the individual nanoslabs, which form the zeolite structure. The second level is the coupling between these slabs according specific rules which give rise to a chracteristic mesoporosity. The second goal is then to synthesise new hierarchic materials and to characterise their physical and chemical properties.

    Researcher(s)

    Research team(s)

    Focused ion beam (FIB). 01/01/2004 - 31/12/2006

    Abstract

    Researcher(s)

    Research team(s)

    Quantitative high-resolution transmission electron microscopy of interfaces and defects in ceramic thin films. 01/10/2003 - 30/09/2006

    Abstract

    Ceramic thin films have attracted great interest since they exhibit a rich spectrum of physical properties (e.g. ferromagnetism, colossal magnetoresistance and superconductivity). The nature of these properties is determined by very small characteristic length scales. Up till now, high-resolution transmission electron microscopy (HRTEM) was considered as the standard technique to study the atomic structure of thin films. However, the analysis of HRTEM images is hampered by aberrations of the electromagnetic lens system. Another disadvantage of "classical" microscopy is the fact that only intensity (=(amplitude)2), can be recorded and therefore, an essential part of the electron wave, being the phase, is lost. Different techniques have been developed to solve the above-mentioned problems and two of them will be used in this project: the "focus variation" technique and "off-axis electron holography". Up till now, these methodes were only used in experiments in which the structure of the materials was already know. Therefore, the challenge of this project is to use quantitative HRTEM in the study of nanosystems and systems in which local (tiny) structural changes influence their properties. Atom positions near interfaces and defects may deviate from their ideal positions. However, these small changes can have a large influence on the physical properties of the materials. The intention of this project is to determine atom positions (or strain) near planar discontinuities (substrate-film interfaces, crystal defects, ...) in nanostructured materials with a precision of 5-10 pm. In practise, the experiments will primary use superconducting (La-Sr)CuO4 thin films on a LaSrAlO4 substrate and (La-Sr)MnO3 CMR materials, deposited on different substrates.

    Researcher(s)

    Research team(s)

    TEM: the guide to improved III-V semiconductors, GaN in particular. 01/10/2003 - 30/09/2005

    Abstract

    Due to its exceptional physical properties, GaN is a promising semiconductor material for use in both electro-optical devices (LEDs, LDs) and electronic devices (high power, high frequency transistors). The production of GaN based structures remains however difficult, mainly by the lack of a decent substrate. On top, GaN shows piezo-electrical properties which makes that device characteristics are very sensitive to changes in the strain state of the material. Transmission electron microscopy (TEM) is applied to obtain structural and chemical information of GaN (test) structures on an (sub)nanometre scale. This information is very often necessary to explain physical properties of the (test)structures.

    Researcher(s)

    Research team(s)

    01/07/2003 - 31/12/2003

    Abstract

    Researcher(s)

    Research team(s)

    Mechanism of biaxial alignment in thin films, grown by unbalanced magnetron sputtering. 01/05/2003 - 30/04/2007

    Abstract

    The main aim of this project is -to clarify the role of low energetic bombardment by unbalanced magnetron sputtering on adhesion, microstructure, grain boundaries and orientation of thin films. -to obtain a strong preferential orientation in/out of the plane for cubic oxides, metallic and semiconducting materials -to determine the correlation between microstructure and growth mechanism of thin films.

    Researcher(s)

    Research team(s)

    Monodispersed inorganic nanoclusters as building blocks for functional materials. (NanoCluster) 01/07/2002 - 30/06/2006

    Abstract

    Researcher(s)

    Research team(s)

    New mixed-valence perovskites with important physical properties. 01/07/2002 - 31/08/2004

    Abstract

    Researcher(s)

    Research team(s)

    01/05/2002 - 30/04/2004

    Abstract

    Researcher(s)

    Research team(s)

    Quantum size effects in nanostructured materials. 01/01/2002 - 31/12/2006

    Abstract

    Researcher(s)

    Research team(s)

    01/01/2002 - 31/12/2002

    Abstract

    Researcher(s)

    Research team(s)

      Microstructural and phase transformations in advanced materials. 17/12/2001 - 17/12/2004

      Abstract

      Researcher(s)

      Research team(s)

      Structural and chemical analysis of grainboundaries and interfaces in high-Tc superconductors using advanced transmission electron microscopy. 01/10/2001 - 30/09/2003

      Abstract

      Within this project we will investigate grainboundaries and interfaces in superconducting thin films and tapes using high resolution transmission electron microscopy. This will lead to an optimization of the physical properties of these systems.

      Researcher(s)

      Research team(s)

        01/10/2001 - 30/09/2003

        Abstract

        Researcher(s)

        Research team(s)

          Microstructure and nano-structured materials. 01/10/2001 - 30/09/2002

          Abstract

          The microstructure and nanostructure of thin film materials becomes more an more important with a reduction of the components. The idea is to correlate with the help of electron microscopy the local structure with the physical and chemical properties.

          Researcher(s)

          Research team(s)

            The local structure of low-dimensional magnetic transition metal oxides by HREM. 01/04/2001 - 31/12/2001

            Abstract

            Researcher(s)

            Research team(s)

              01/04/2001 - 31/12/2001

              Abstract

              Researcher(s)

              Research team(s)

                The local structure of nano structured materials and thin film ceramic and semiconducting materials. 01/01/2001 - 31/12/2004

                Abstract

                The recent evolution from microtechnology to nanotechnology only increases the importance of transmission electron micrsocopy. The idea is to quantify not only the sub 0.2 nm high resolution electron microsocopy, but also the local energy electron loss spectra.

                Researcher(s)

                Research team(s)

                Quantitative electron microscopy study of nanoparticles and atomic clusters. 01/10/2000 - 30/09/2002

                Abstract

                Using quantitative electron microscopy we will try to determine the internal structure as well as the surface structure of nanoparticles. This for metallic particles of the order of 1nm as well as for larger fullerene particles of the order of 100 nm.

                Researcher(s)

                Research team(s)

                  TEM study of complex transition metal phosphates. 01/10/2000 - 30/09/2001

                  Abstract

                  Investigation of the average and local structure of complex transition metal phosphates prepared under different conditions at Moscow State University.

                  Researcher(s)

                  Research team(s)

                    Scholarship S. KRET; 01/10/2000 - 30/09/2001

                    Abstract

                    Researcher(s)

                    Research team(s)

                      FWO Sabbatical leave. 01/10/2000 - 30/09/2001

                      Abstract

                      Researcher(s)

                      Research team(s)

                        Structure determination of ceramic thin films by quantitative transmission electron microscopy. 01/01/2000 - 31/12/2001

                        Abstract

                        A study of the local atomic structure of ceramic thin films by quantitative TEM. A model for the electron-object interaction and the imaging process has unknown parameters; like the local atom positions, which can to be determined from the experiment with high precision using a criterium.

                        Researcher(s)

                        Research team(s)

                          Changing the electron gun of the 4000EX microscope. 01/12/1999 - 31/12/1999

                          Abstract

                          Researcher(s)

                          Research team(s)

                            Changing work station. 01/11/1999 - 31/12/1999

                            Abstract

                            Changing the work station IBM RS 6000, of the research groups 'Electron Microscopy for materials research' and 'Theoretical study of matter' by the workstation DEC Alpha XP1000 (667 Mhz) with 2.0 gigabyte, incl. 2 PC's to change the existing facilities as an integrated part of the workstation

                            Researcher(s)

                            Research team(s)

                              Structural and microstructural characterisation of perovskite based materials with CMR properties. 01/10/1999 - 30/09/2001

                              Abstract

                              Different materials based on the perovskite structure show CMR behaviour. In order to better understand this phenomenon it is essential to investigate the influence of the composition, the doping and the heat treatment on the structure and the physical properties of these materials.

                              Researcher(s)

                              Research team(s)

                                Structural and chemical analysis of grainboundaries and interfaces in high-Tc superconductors and CMR oxides using advanced transmission electron microscopy. 01/10/1999 - 30/09/2001

                                Abstract

                                Within this project we will investigate grainboundaries and interfaces in superconducting thin films and tapes using high resolution transmission electron microscopy. This will lead to an optimization of the physical properties of these systems.

                                Researcher(s)

                                Research team(s)

                                  TEM investigation of superconductors and related compounds. 01/09/1999 - 31/08/2000

                                  Abstract

                                  Characterisation of new compounds in the Ba-K-O system Investigation of AxNbS2 and Anb2S5 systems (A=Sr,Eu) HREM study of the structure of Eu1.14Nb1.8S5 compound

                                  Researcher(s)

                                  Research team(s)

                                    Electron microscopic study of precursors and phase transformations in nanoscale intermetallic compounds. 01/04/1999 - 31/03/2000

                                    Abstract

                                    Precursors of different phase transformations in Ni-based alloys will be investigated by different advanced TEM techniques, including quantitative high resolution and electron energy loss spectroscopy. This way new detailled information on structure, composition and electronic parameters will be obtained.

                                    Researcher(s)

                                    Research team(s)

                                      Changing the heating holder of the CM-20 electron microscope. 01/02/1999 - 31/12/1999

                                      Abstract

                                      Researcher(s)

                                      Research team(s)

                                        Study of the electrical and magnetic properties of mixed oxides. 01/01/1999 - 31/12/1999

                                        Abstract

                                        Combination of structural studies based on X-ray analysis and transmission electron microscopy. A fundamental study of oxydes with mixed valence which have characteristic electric and/or magnetic properties.

                                        Researcher(s)

                                        Research team(s)

                                          Carbon and BN nanotubes. 01/01/1999 - 31/05/1999

                                          Abstract

                                          Recently BN-SiO2-SiC nanocables have been made with ticknesses of a few tens of nanometers and lengths of several microns. This "hot subject" deserves further investigation.

                                          Researcher(s)

                                          Research team(s)

                                            Comparative study of the primary stages of the cluster formation of Co/Fe, introduced in Ag, Al or SiO2 by ion implantation, co-evaporation or co-sputtering. 21/12/1998 - 21/12/2001

                                            Abstract

                                            Clusters of nanometer sizes have attracted a strong research interest because of their intriguing properties, often related to the large fraction of interface atoms. Potential applications emerge, in particular of granular magnetic material exhibiting G.M.R. effects as required for novel high-density memories. The magnitude of these effects is directly correlated to the total magnetic moment present at the interface between magnetic and non-magnetic phases. Fundamental physiscs investigation is required in this domain to concentrate on the primary stages of the precipitation process, starting from single atoms over dimers to tiny agglomerates, where a large fraction of the cluster atoms is located at the interface. Knowledge of the precise state and magnetic moment formation of atoms at the interface is of great importance and is still lacking. A better insight is stronly needed in that interface, in particular with regard to magnetic aspects, such as the reason for the huge magnetic anisotropy energy, for the record-high coercitivity of clusters and for the lower interface magnetic field compared to the strongly enhanced magnetic moment at the surface of free clusters. The aim of the project is to help elucidate the primary steps in the precipitation, the magnetic structure of Co dimers, the nature of the clusters's interface, structural and magnetic, and its ensuing role in establishing important characteristics of the cluster, als in the interior. This encompasses a systematic and comparative investigation of Co, possibly Fe, upon precipitation from supersaturation in Ag, and possibly also in A1 and SiO2.

                                            Researcher(s)

                                            Research team(s)

                                              Quantitative electron microscopy study of nanoparticles and atomic clusters. 01/10/1998 - 30/09/2000

                                              Abstract

                                              Using quantitative electron microscopy we will try to determine the internal structure as well as the surface structure of nanoparticles. This for metallic particles of the order of 1nm as well as for larger fullerene particles of the order of 100 nm.

                                              Researcher(s)

                                              Research team(s)

                                                Lorentz image formation at magnetic materials implemented in a standard transmission electron microscope: optimalisation and quantitative development. 01/10/1998 - 31/07/1999

                                                Abstract

                                                Magnetic materials have a large technological importance. Lorentz image formation at magnetic materials is limited in resolution, but it is a chalenge to implement this on a standard transmission electron microscope. We will try to study in this way magnetic nanoparticles.

                                                Researcher(s)

                                                Research team(s)

                                                  Structural properties of CMR thin layers. (FWO Vis.Fel.) 01/02/1998 - 31/01/1999

                                                  Abstract

                                                  Thin CMR films deposited on a substrate often show physical properties, different from the bulk properties. By a optimized choice of the substrate stresses are induced in the film which determine the microstructure of the film.

                                                  Researcher(s)

                                                  Research team(s)

                                                    Local structure of superconducting Cu-based oxyfluorides. 17/11/1997 - 16/11/1998

                                                    Abstract

                                                    A number of Cu-based high Tc materials allow the (partial) substitution of oxygen by fluorene. This generally alters the physical properties and very often also the structural properties. These structural properties are studied by electron microscopy.

                                                    Researcher(s)

                                                    Research team(s)

                                                      Investigation of crystal structure of semiconductive thin films and layers. 09/10/1997 - 08/10/1998

                                                      Abstract

                                                      Different thin layer semiconductors (GaAs of GaAs-AlAs), deposited on silicon have been prepared in Russia and will be investigated by transmission electron microscopy in order to establish the quality and the interface structure.

                                                      Researcher(s)

                                                      Research team(s)

                                                        Structural and microstructural characterisation of perovskite based materials with CMR properties. 01/10/1997 - 30/09/1999

                                                        Abstract

                                                        Different materials based on the perovskite structure show CMR behaviour. In order to better understand this phenomenon it is essential to investigate the influence of the composition, the doping and the heat treatment on the structure and the physical properties of these materials.

                                                        Researcher(s)

                                                        Research team(s)

                                                          Organisation workshop "Chemistry and technology of high-temperature superconductors (HTSC) and related advanced materials". 01/08/1997 - 31/12/1997

                                                          Abstract

                                                          Researcher(s)

                                                          Research team(s)

                                                            Artificially layered perovskites: giant magnetoresistance and superconductivity. 01/01/1997 - 31/12/2002

                                                            Abstract

                                                            Perovskite based ceramic materials can show very special properties; high Tc superconductivity and collosal magnetoresistance are among them. The idea is to produce two dimensional artificially layered structures of these materials. Physical properties will be measured at the University of Leuven, structural properties at the University of Antwerp.

                                                            Researcher(s)

                                                            Research team(s)

                                                              Reduced dimensionality systems. 01/01/1997 - 31/12/2001

                                                              Abstract

                                                              Technological applications of modern materials science are often based on thin films (two dimensional), one dimensional fibres or zero dimensional quantumdots. In order to better understand the physical, chemical or mechanical properties, a local structural characterisation is necessary. For this purpose, transmission electron microscopy (RUCA) and surface characterisation (UIA) are necessary techniques.

                                                              Researcher(s)

                                                              Research team(s)

                                                                Study of the premartensitic and martensitic atomic and micro-structures by means of high resolution electron microscopy (HREM) 01/05/1996 - 30/04/1998

                                                                Abstract

                                                                The atomic and micro-structure of alloys which undergo a martensitic phase-transition is studied by means of HREM and related techniques. Considering the present interest for high temperature materials Cu-Zr and Ni-Mn-Ti has been chosen. Fundamental as well as application-directed phenomena are studied.

                                                                Researcher(s)

                                                                Research team(s)

                                                                  Improvement and application of high resolution electron microscopy techniques to the study of materials. 01/01/1996 - 31/12/1999

                                                                  Abstract

                                                                  1) Order-disorder phenomena in metallic alloys - Martensitic transformations; 2) Structure of and defects in ceramic materials; 3) Super-ionconductors; 4) Modulated incommensurable structures; 5) Phase transitions; 6) Characterization of separation surfaces between solid phases.

                                                                  Researcher(s)

                                                                  Research team(s)

                                                                    High resolution electron microscopy investigations of the structure of mercury based superconducting mixed copper oxides and thin films based on fullerenes (C60 and C70) on different substrates. 14/11/1995 - 13/11/1996

                                                                    Abstract

                                                                    Researcher(s)

                                                                    Research team(s)

                                                                      Study of the chemical, structural and physical properties of the Hg-bearing Cu oxide superconductors. 01/11/1995 - 31/10/1998

                                                                      Abstract

                                                                      Recently discovered mercury based superconducting compounds have the highest critical temperature (133K). The structure however is very flexible and allows for various substitutions on the anion as well as on the cation sublattice. We investigate the possibility of creating better superconducting properties by suitable substitutions.

                                                                      Researcher(s)

                                                                      Research team(s)

                                                                        01/11/1995 - 30/09/1996

                                                                        Abstract

                                                                        Researcher(s)

                                                                        Research team(s)

                                                                          High resolution electron microscopy study of new and complex phases in semiconducting materials. 01/02/1995 - 31/05/1996

                                                                          Abstract

                                                                          Researcher(s)

                                                                          Research team(s)

                                                                            Stability, synthesis and plasticity in intermetallic superlattice compounds. 01/01/1995 - 31/12/1998

                                                                            Abstract

                                                                            Microscopic structures being responsible for typical mechanical behaviour of intermetallic systems (e.g. Fe-Al alloys) are investigated by electron microscopy.

                                                                            Researcher(s)

                                                                            Research team(s)

                                                                              In-situ study of point defect reactions in silicon, germanium and their alloys through extendend lattice defect generation by high flux electron irradiation 01/01/1995 - 31/12/1998

                                                                              Abstract

                                                                              High voltage electron microscopy and high resolution electron microscopy will be used for in-situ studies of the atomic structure, the nucleation and the growth characteristics of defects resulting from irradiation. Models derived from image data will be confronted with image simulations based on the model and plausibility considerations concerning the point defect interactions.

                                                                              Researcher(s)

                                                                              Research team(s)

                                                                                Chemical synthesis of novel superconductors. 01/10/1994 - 30/09/1997

                                                                                Abstract

                                                                                Researcher(s)

                                                                                Research team(s)

                                                                                  The influence of the local structure on the superconducting properties for samples in the Y-Ba-Cu-O and related systems. 01/10/1993 - 31/03/1995

                                                                                  Abstract

                                                                                  Researcher(s)

                                                                                  Research team(s)

                                                                                    Synthesis, microscopic and spectroscopic characterization of fullerenes, fullerites and fullerides. 01/01/1993 - 31/12/1994

                                                                                    Abstract

                                                                                    New and existing fullerenes will be produced and characterised based on mass spectroscopy and electron microscopy. Different phase transitions are studied experimentally and theoretically. Together with the group of Prof. Lucas we will try to characterize structurally thin fullerene films on different substrates.

                                                                                    Researcher(s)

                                                                                    Research team(s)

                                                                                      High resolution electron microscopy of structures and defects of solid state materials. 01/01/1993 - 31/12/1994

                                                                                      Abstract

                                                                                      Study of high resolution techniques for their application in the analysis and characterisation of materials, their structure, defects and their physical behaviour upon thermal treatment. Interpretation theories and the development of algorithms and procedures for improving the instrumental capabilities also belong to the programme. These techniques will be applied for studies of materials such as semiconductor elements for microelectronics, alloys, ceramic materials, and other inorganic compounds.

                                                                                      Researcher(s)

                                                                                      Research team(s)

                                                                                        The investigation of grain boundaries and interfaces structure in HTSC films and substrates by HREM. 01/01/1993 - 31/12/1993

                                                                                        Abstract

                                                                                        Researcher(s)

                                                                                        Research team(s)

                                                                                          01/01/1992 - 31/12/1997

                                                                                          Abstract

                                                                                          Researcher(s)

                                                                                          Research team(s)

                                                                                            01/02/1991 - 31/07/1993

                                                                                            Abstract

                                                                                            Researcher(s)

                                                                                            Research team(s)

                                                                                              01/01/1991 - 31/12/1996

                                                                                              Abstract

                                                                                              Researcher(s)

                                                                                              Research team(s)

                                                                                                01/12/1990 - 31/12/1995

                                                                                                Abstract

                                                                                                Researcher(s)

                                                                                                Research team(s)

                                                                                                  01/01/1990 - 31/12/1993

                                                                                                  Abstract

                                                                                                  Researcher(s)

                                                                                                  Research team(s)

                                                                                                    01/11/1989 - 30/10/1994

                                                                                                    Abstract

                                                                                                    Researcher(s)

                                                                                                    Research team(s)