The local ordering of atoms at the surface of a metallic particle determines its catalytic activity and selectivity. As energy systems of the future will be based on efficient catalytic conversion of small molecules in closed cycles, we study how structural effects of catalysts can be used to our ad…

Promotor: Prof.dr. G.J. Kroes

Heterogeneous catalysis is essential to many industrial applications. These catalysts are often comprised of supported nanoparticles, which contain various different surface sites.

The dissociative chemisorption of methane on metal surfaces is of fundamental and practical interest, being a rate-limiting step in the steam reforming process. The reaction is best modeled with quantum dynamics calculations, but these are currently not guaranteed to produce accurate results because…

Promotor: Arjen Doelman, Co-promotor: Vivi Rottschäfer

How can we make make accurate predictions for reactions of molecules on metal surfaces?

Unfolding potential

This thesis describes the use of a combined approach of computational and experimental techniques to gain novel insights to understand the glycosylation reaction and its reactive intermediates.

In the thesis the dynamics of strategies is studied from two perspectives.In the first part of the thesis strategies are considered to be opinions present in a community.

This perspective addresses four challenges facing theorists whose aim is to make quantitatively accurate predictions for reactions of molecules on metal surfaces, and suggests ways of meeting these challenges, focusing on dissociative chemisorption reactions of H2, N2, and CH4.

Promotores: G.W. Canters, T.J. Aartsma

How can we make the production of chlorine cheaper and more friendly for the environment?

In this thesis, dynamic testing principles were applied to examine young children's potential for learning. Our studies focused on the role of cognitive flexibility, to further increase our understanding of the cognitive processes involved in children's ability to learn from instruction and feedback,…

The research presented in this thesis makes use of small molecules (as H2 , D2 and O2 ) on well-defined single crystal surfaces (flat Pt(111), flat Cu(211) and curved Pt(111)) to elucidate the role of surface structure and degrees of freedom in the reactant in specific surface reactions.

In this thesis, we study travelling waves in stochastic reaction-diffusion equations. We extend techniques from the deterministic theory for travelling waves to apply to the stochastic version, which allows us to compute the stochastic wave speed and shape, and draw conclusions on the stability of the…

The dissociation of CH4 into CH3 + H on a metal surface is the rate determining step in processes which produce hydrogen, such as steam reforming and catalytic partial oxidation. Ultimately, we want to study the dissociation of methane on Ni(111) and Pt(111) quantum mechanically while taking into account…

An assessment approach that tailors to children’s instructional needs

Promotor: Prof.dr. T.J. Aartsma, Co-promotor: R.N. Frese

Can dynamic testing provide us with insight in children’s potential for learning?

The glycosylation reaction is a pivotal reaction in creating new and complex oligosaccharides.

In this dissertation, the synthesis and characterization of a series of iron complexes based on different ligand platforms are described.

BlaC is the β-lactamase of Mycobacterium tuberculosis. We show that it can recover from inhibition by clavulanic acid and that phosphate helps it do so.

Chemical reactions go hand-in-hand with an energy exchange with the environment in which they take place. Surfaces offer a variety of energy dissipation channels, constituted by the nuclear and electronic degrees of freedom of the atoms at the interface. Aiming at an improved future harvesting of energy,…

Promotor: Prof.dr. E. Bouwman

Chemical reactions go hand-in-hand with an energy exchange with the environment in which they take place. Surfaces offer a variety of energy dissipation channels, constituted by the nuclear and electronic degrees of freedom of the atoms at the interface. Aiming at an improved future harvesting of energy,…

Hetterscheid

Catalysis is of extreme relevance in the production of everyday materials and plays a central role in many aspects of our life.

Promotor: A. Doelman, Co-promotor: J.D.M. Rademacher

Promotor: M.T.M. Koper, Co-Promotor: L.B.F. Juurlink

Koper

A difficulty of studies on chemical kinetics are the reaction time scales and detection of their intermediates.

Developing methodes to understand the evolution of patches in natural ecosystems

Promotor: Prof.dr. S.F. Portegies Zwart, Co-promotor: D.C. Heggie

The research of our group is centered around dynamical systems, functional analysis and their interplay.

If gifted children are experts in using strategies, why do they experience problems with learning? Why do they underachieve?

Dynamic nuclear polarization with paramagnetic agents can enhance nuclear magnetic resonance signals by orders of magnitude. The mechanism of enhancement depends a.o. on the magnetic resonance properties of the agents used. Electron spin relaxation times at NMR relevant magnetic field/microwave frequencies,…

The research of this programme is centered around dynamical systems, functional analysis, and their interplay.

Although it is often assumed that the stereochemistry in Ugi multicomponent reactions is determined in the final Mumm rearrangement step, experimental and computational evidence that Ugi reactions on hydroxylated pyrrolines proceed under kinetic control is reported.

Actin Polymerization and Membrane Physics in Living Cells: Analysis of cell spreading mechanisms

Methods for accurately computing the interaction of molecules with metal surfaces are critical to understanding and thereby improving heterogeneous catalysis.

Promotor: W.Th.F. den Hollander

This research group is interested in the physics of living cells, especially their cytoskeleton dynamics under defined external stimuli.

Promotor: E. Bouwman, Co-promotor: S. Bonnet

Promotor: Prof.dr. W.Th.F. den Hollander, Co-promotor: R. Fernandez

Promotor: J.W. van Holten

What is the relationship between outcomes of dynamic testing and cognitive flexibility in young children?

Promotor: Huub de Groot, Co-promotor: Francesco Buda