In this thesis integral points on affine del Pezzo surfaces are studied.

This PhD thesis concerns the topic of arithmetic geometry. We address three different questions and each of the questions in some way is about counting how big some set is or can be.

Promotor: P. Stevenhagen, Co-promotor: R.M. van Luijk

Promotores: P. Stevenhagen, L. van Geemen (Università degli studi di Milano), Co-Supervisor: Ronald M. van Luijk

The research aim of the Catalysis and Surface Chemistry group headed by Prof. Marc Koper is to probe and understand chemical reactions on well-defined, mostly single crystalline, surfaces at the molecular level.

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

PhD Defence

PhD Defence

Promotores: P. Stevenhagen, L. van Geemen Co-promotor: R.M. van Luijk

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.

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

Promotor: G. J. Kroes

Improving environmental risk assessment of pesticides in surface waters

Several techniques are explored for going beyond the born-oppenheimer static surface model for molecule-surface reactions.

Promotor: Prof.dr. J.W.M. Frenken

Advanced sensing techniques require graphene with high quality and well-controlled surface chemistry.

Promotor: M.T.M. Koper, Co-promotors: A.I. Yanson, L.B.F. Juurlink

Promotor: Peter Stevenhagen

Promotor: Prof.dr. G.J. Kroes

The surface and the edges of graphene are expected to provide higher sensitivity and specificity in detecting and characterizing single molecules. However fundamental physical limits exist in reaching an ultimate precision in detecting the dynamics of chemical and biological systems. The research in…

Promotor: Prof.dr. H.V.J. Linnartz, Co-Promotores: H.M. Cuppen, S. Ioppolo

Promotor: Prof.dr. T. Schmidt, Co-Promotor: Dr. ir. S.J.T. van Noort

van Luijk

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…

Is it possible to successfully design self-assembling nano-scale protein skeletons for use as a vaccine platform?

Aqueous solutions of proteins and carbohydrates separate into two parts with an extremely ‘soft’ boundary surface. The surface tension between these two parts can be manipulated, for example by adjusting the pH balance. This can be used to develop emulsions of a water-based solution in another aqueous…

PhD Defence

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…

Theorists have recently made substantial progress in simulating reactive molecule-metal surface scattering but still face major challenges. The grand challenge is to develop an approach that enables accurate predictive calculations of reactions involving electronically excited states with potential…

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

To deliver a Virtual Sensor tool optimised to exploit the synergy between Sentinels 2 and 3 to allow the consistent retrieval of land surface parameters (Albedo, LAI, and LST); To extend the existing capabilities of land EO data assimilation tools to add capacity to handle data in the thermal domain…

Surface plasmons (SPs) are surface waves at the interface between a dielectric and a good metal, and are formed by the interaction between light and the free electrons at the metal-dielectric interface. They provide strong field confinement for optical fields, opening new possibilities for enhanced…

This meeting will be devoted to recent advances in the operando investigation of reactivity at surfaces from both experimental and theoretical points of view.

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.

Math girls Jeanine Daems and Ionica Smeets have received the Mr. K.J. Cath prize during the opening of the academic year in Leiden.

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

Intensive public debates have erupted about integration of immigrants in Europe. The influx of refugees from the middle east during the summer and autumn of 2015, the increasing visibility of immigrants throughout European societies, but also the widely publicized occurrences on New Year’s eve in Cologne…

On September 1st, during the opening of the academic year, former IBL-student in Science-Based Business Wouter Bruins was awarded the prize for his publicity achievements for the university.

On 24 September the Institute of Environmental Sciences (CML) in Leiden will launch the new version of the Pesticides Atlas in cooperation with Rijkswaterstaat and Royal HaskoningDHV. The online tool is now faster, more user-friendly, more accessible and all data can be downloaded directly. Users can…

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

We aim to understand ion homeostasis in the model eukaryote S. cerevisiae.

The focus throughout this thesis will be on gathering fundamental studies of the detailed structure and composition of the electrode/electrolyte interface effect on the rate and mechanism of key electrocatalytic reactions.