MESA+ University of Twente
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Mesa+

2004

Interview with Andrea Sartori A calixarene is a ring shaped molecule. On this molecule one, two or three ligands able to bind metal ions were attached. Nucleases and Transacylases are hydrolytic enzymes that exploit metal ions in the catalytic process. The idea was to make a calixarene structure able to mimic the catalytic activity of these enzymes. The aim is to produce a molecule that can selectively recognize and cleave the RNA... Interview with Andre Hof Electronic switching on chips these days primarily comprises complementary MOS*-switches called CMOS (*Metal Oxide Silicon, a method to make transistors). The gate dielectric is an insulating layer of two nanometres, which is about ten atomic layers, so in fact hardly anything at all. So when exposed to an electric current of a few Volts the insulating capacity is questionable... Interview with Attila Olah I have been studying the adhesive properties of different polymer surfaces. This was one part of the research and the other was building a device for the adhesion measurements. In the literature this instrument is often referred as JKR adhesion-testing device, but we simply called it ATD. For the studies of surface forces, which intimately relates to the adhesion we have also developed a model material, a kind of artificial latex... Interview with Aurel Ymeti The work we did is based on the development of a highly sensitive multichannel integrated interferometric sensor for measurement of very low concentrations of certain substances in a given sample solution; traces of pesticides in water or virus particles in blood for example. We have shown that this sensor is extremely sensitive and the detection of one single virus particle is feasible... Interview with Beata Marton The aim of the project was to investigate how the alkyd film is drying. Since the solvent borne paints are used less for environmental reasons, the water borne paints have become more important in the industry. But the drying process presents problems. It is an oxidative drying, so it starts on the surface and is not homogeneous in the depth of the film... Interview with Björn Timmer About 15 years ago ECN developed an ammonia monitor, a device to measure ammonia in the air. This was partly commissioned by RIVM (Rijks Instituut voor Volksgezondheid en Milieu) who set up a national programme to ‘sniff’ ammonia in the air, the reason being the intensive cattle breeding and the numbers of live stock in the Netherlands... Interview with Bärbel de Bakker I developed and built a microscope for researching the nanostructure of cell membranes. Cell membranes are complicated structures of lipid bilayer interspersed with special molecules, for instance signal or binding molecules, determining the function of the cell. It is very difficult to image the various molecular components of the cell membrane, as it is such a minute structure... Interview with Danko van der Laan The electrical loss in for instance high voltage cables is under normal circumstances about 10%. A lot of materials have superconductor properties when functioning at a low temperature, which makes a more efficient production and transport of electrical power possible. I investigated the possibilities for improvement of high-temperature superconductors for the use in power applications... Interview with Dragana Mijatovic Magnesium Diboride is a material that has been synthesized in the fifties, but its superconducting properties were announced for the first time in January 2001. Superconductivity means that below a certain temperature a current can be conducted through some material without any resistance. This superconductor can operate at a temperature of 39 Kelvin (about -240C), which means that you can use much smaller coolers with less input power... Interview with Francesca Corbellini The main goal was to synthesize molecular containers soluble in water for potential use as drug delivery systems. We wanted to create a molecular container which could encapsulate a guest molecule. We start from two pieces, one is positively charged and the other is negatively charged... Interview with Frank van Dijk The deposition of cobalt on copper in a wet medium as opposed to Ronald van Moere, who conducted his experiments in a UHV environment. In my case cobalt is electrochemically deposited on copper in a solution of distilled water, cobalt and a bit of hydrochloric acid. Cobalt is chosen because of its magnetic properties... Interview with Henkjan Gersen The aim was to investigate what happens inside a complex photonic crystal structure. In photonic structures light can be caught or goes through it. It has been investigated how the light goes in and how it comes out, but until this moment you could not tell what exactly happens to the light inside the structure... Interview with Hien Duy Tong We have utilized microfabrication techniques to develop new approaches for making both dense as well as porous membranes. The Pd-based membranes are fabricated and used as hydrogen purifiers to get high quality hydrogen, and as membrane reactors for several dehydrogenation reactions. We used palladium because of its unique properties to absorb huge amounts of hydrogen... Interview with Jelena Sekulic Membrane technology is of course one of the specialities of this institute, but titania (Titanium Oxyde) is a new material for membranes, which is in certain areas a definite improvement.
It is highly chemically stable in almost all environments and has a pretty good separation performance...
Interview with Joost van Honschoten The Microflown is an acoustic sensor, a very small device measuring sound. This is of course something a microphone also does. In a microphone the pressure is measured. Sound is not also produced by pressure but also by a rapid movement of particles. The Microflown operates on the principle of measurement of the speed of sound. In a Microflown there are two very thin wires, much thinner than a hair – if air flows past it, one little wire will cool more rapidly than the other... Interview with Maria Monserrat de la Luz Garcia Curiel Actually, I could explain it in a simple way: I have been working with nylon and improved its properties. The idea was to work with thermoplastic polymers, such as nylon, to improve its properties by using silica nanoparticles.
So I studied the effect of the addition of the inorganic material in the polymer. Does it improve the properties of the nylon and if so, in what way?...
Interview with Marta Reinoso Garcia Interview with Marta Reinoso Garcia

What we basically wanted is to make an organic compound to treat nuclear waste, and convert it in a substance with a shorter term of radioactivity. For that purpose we tried to develop chelating agents that bind selectively to the actinide over lanthanide substances. In my case the chelating system was something like a hand, with folding fingers.
There is still a lot of ongoing research in nuclear waste. The problem is very complex and there still is not much known about actinides. We need something that is selective on the actinides...
Interview with Matthijs ten Cate The idea of the project is the development of receptors to recognize foreign substances, for instance medicines.
The financer, STW, was interested in a project enabling testing medicines outside the body, which decreases the use of laboratory animals. But receptors on ‘smart vesicles’ could also be deployed in the body to recognize for instance cancer cells. This is the ultimate purpose and the basic idea...
Interview with Nguyen Van Hieu Studies in my thesis are about reliability of the multilevel interconnects. It can be recognized that in the computer processors, there is a dense array of narrow, thin-film metallic conductors that serve to transport current between the various devices on the chip. These metallic conductors are called multilevel interconnects... Interview with Remco van de Beek Investigations in the IC design sector of Philips’ NatLab, financers of my research, and the IC Design group of the UT nearly all aim at the design of working chips demonstrating a new principle. My chip deals with frequency multiplication... Interview with Roald Tiggelaar Our research was a feasibility study into the fabrication of a microreactor for gases using silicon technology.
Something that small as the reactor we developed has certain advantages. It is easier to heat, and easier to cool, so it is easier to sustain the reaction and on a smaller scale you can test reactions that would get out of hand in a bigger environment...
Interview with Ronald Van Moere Half of my thesis is a theoretical model and the other half is about diffusion research and the embedding of cobalt atoms on copper substrate. There was a general model for the copper substrate, but I added an extra interaction which allowed us to make a detailed analysis of the energetics. The steady decrease of cobalt atoms resulted in all kinds of different interactions... Interview with Sasa Radovanovi Let me start by explaining the abbreviation in the thesis title. CMOS technology is a standard (straightforward) chip technology. Photodiodes in the title presents converters which convert a light into electronic signal. However, not the light from the daily environment but the light coming from the optical fiber... Interview with Steffen Onclin I deposited a monolayer of organic host molecules on a glass substrate, which we call a molecular printboard. On this printboard guest molecules were positioned by stamping or by writing with an AFM tip. Since the guest molecules bind through supramolecular interactions, it is possible to erase the formed patterns again. The patterns can be made visible by using fluorescent molecules... Interview with Svetlana Bystrova Our aim was to make a material, which can serve as a diffusion barrier against Cu. Such a material should be suitable for a fabrication of chips with Cu metallisation. The copper metallisation can be used to make chips faster. Also dimensions of interconnects can be reduced and this is important for a scaling of devices... Interview with Tanja Steinkamp I’ll try to explain from the beginning. Lanthanides are part of the so-called rare earth metals. Some of them fluorescence in the dark if you radiate them with light at a certain wavelength. Because it is hard to excite the ‘naked’ metal ions we add an organic ligand to the metal forming a complex, which we then irradiate with light... Interview with Toon Kuijpers The basis is the development of a capacitive position sensor with the aim for positioning of Micro Electro Mechanical Systems (MEMS). These systems often contain micro-actuators, which are tiny motors with micrometer-scale dimensions, which are used for the positioning of tiny lenses, fibres, or heads on hard disks...