Promotor: J.P. Abrahams, Co-promotor: T. Grüne

Promotor: J. Zaanen, Co-Promotor: V. Juricic

In this thesis, we study different curved single crystals because of the diversity of surface structures across their curvature.

Curved single crystals provide variable, but well-defined surface structures.

Because thin systems can deform along the thickness with relative ease, the interplay between surface mechanics and geometry plays a fundamental role in sculpting their three-dimensional shape.

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.

This thesis aims to demonstrate how the achromatic nature and design flexibility of liquid-crystal optics can be used to improve high-contrast imaging instruments to facilitate detailed exoplanet characterization.

In most applications, electrocatalysts exhibit a large surface area to volume ratio, for example using nanoparticles.

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

It has been a long-standing mystery how complex biological structures emerge from such seemingly uncoordinated building blocks as cells and tissues, in the presence of only minimal environmental guidance.

Promotor: J. Zaanen

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: Prof.dr. M.L. van Hecke, Co-Promotor: V. Vitelli

The adsorption of D2 and CO2 on catalyst surfaces is studied using a molecular beam in ultra-high vacuum.

Inspired by natural photosynthesis, perovskite-based photoelectrochemical (PEC) systems are being developed for artificial photosynthesis, aiming to enhance solar-to-hydrogen conversion for green energy.

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

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

Promotor: Christoph U. Keller, Co-promotores: Matthew A. Kenworthy, Frans Snik

This thesis explores different avenues to develop insurmountable antagonists for CC Chemokine Receptors, such as CCR1, CCR2 and CCR5.

The overarching goal of this thesis is to set the foundations, but also make the first essential steps towards establishing a comprehensive, mesoscopic, hydrodynamic theory of epithelial tissues. The stage is set by an exhaustive study of topological defects in passive p-atic liquid crystals, singularities…

We study the interplay of topology and geometry with chirality for several passive and active systems, employing both analytical and numerical methods.

In surface science there is great effort to move from studying simple, flat model surfaces in vacuum to investigating more complex model catalysts in gas environments (in situ). This thesis gives three examples of such studies using microscopy and spectroscopy.

Spectroscopic studies on fluorescent single molecules in organic condensed matter does not only provide information about the molecule itself, but also its near environment. By suppression of phonon-induced broadening of spectral lines through cooling to low temperatures, small changes in the spectral…

This PhD-thesis presents a study on micron-sized particles, so-called colloids. By controlling the chemical and physical properties of these particles, such as the interparticle interaction and the particles’ shape, colloids can act as building blocks that self-assembly into larger structures.

Dit thematische gebied beslaat wereldwijde transformaties rond de productie, toewijzing en consumptie van hulpbronnen. Verwante onderwerpen omvatten ontwikkeling, financiën en arbeid (inclusief economische migratie). Gelieerde onderzoekers benaderen deze vragen vanuit perspectieven van economie, geschiedenis,…

Promotor: A.P. IJzerman

Promotor: A.P. IJzerman

Materialen zijn gasvorming, vloeibaar of vast, afhankelijk van de manier waarop hun moleculen reageren op temperatuur en druk. Maar wat als de bouwstenen zelf-draaiende deeltjes zijn in plaats van gewone moleculen? Theoretisch natuurkundigen hebben ontdekt wat de fase bepaalt van die kunstmatige materialen.…

This thesis investigates how cell shape and collective behavior influence the dynamics and structure of biological tissues, which are crucial for understanding processes like embryonic development, tissue regeneration, and metastasis.

Promotor: Prof.dr. J.P. Abrahams, Co-Promotor: N.S. Pannu

Cathodic corrosion is a relatively unknown phenomenon that can severely etch metallic electrodes at cathodic (negative) potentials.

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

This thesis describes the development and validation of new high-contrast imaging techniques, with the ultimate goal of enabling the next generation of instruments for ELT-class telescopes to directly image Earth-like extra-solar planets orbiting around nearby stars.

The elementary excitations of magnets are called spin waves, and their corresponding quasi-particles are known as magnons. The rapidly growing field of Magnonics aims at using them as information carriers in a new generation of electronic devices, (almost) free of electric currents.

Streptomyces are multicellular, Gram-positive bacteria in the phylum of actinobacteria which produce a high amount of bioactive natural products of which the expression is tightly coordinated with the life cycle.

Voltammetry plays a crucial role in modern scientific research by offering valuable insights into the electrochemical properties of materials, with wide-ranging applications in fields such as materials science, energy storage, corrosion studies, and sensor development.

Glycoside hydrolases (glycosidases/GHs) are widely abundant enzymes in all kingdoms of life and are important biocatalysts that catalyze the hydrolysis of glycosidic linkages in oligo/polysaccharides, glycoproteins and glycolipids with tremendous efficiency

Metal complexes and 2D materials like graphene were combined to produce structures that can function as sensors.

The key characteristic of active matter is the motion of an emergent collection (such as a flock of birds), which is driven by the consumption of energy by its active components (i.e. individual birds).

Promotor: Prof.dr. G.J. Kroes

Electrons in a crystal lattice have properties that may differ from those of a free electron in vacuum.

This thesis describes the structural and biochemical characterization of the β-lactamase BlaC from Mycobacterium tuberculosis (Mtb), and the Alr and YlmE proteins from Streptomyces coelicolor A3(2).Mtb is the main cause of tuberculosis.

Promotor: Prof.dr. M.A.G.J. Orrit

Promotie

Zoutkristallen, een golfstick van nanoformaat en gesmolten glas. De LION Image Award-wedstrijd van 2023 leverde weer een heleboel prachtige beelden op. Maar uiteindelijk kan er maar één de winnaar zijn.

Drie quantumveilige cryptografiemethoden zijn sinds deze week gestandaardiseerd voor wereldwijd gebruik. Léo Ducas is medeontwerper van de twee primaire PQC-methoden die voor deze standaardisatie zijn geselecteerd. Ducas maakt deel uit van de Cryptologie-groep van Centrum Wiskunde & Informatica (CWI)…

Kennis van moslimsamenlevingen is onmisbaar om in een geglobaliseerde wereld te kunnen functioneren en om onze eigen Nederlandse maatschappij goed te begrijpen. In Leiden verdiepen onderzoekers zich in de talen, cultuur, religie, rechtssystemen en geschiedenis van moslimsamenlevingen en zetten daarmee…

Dan Shechtman, Nobelprijswinnaar Chemie 2011, geeft op woensdag 19 februari 2014 bij de Universiteit Leiden een lezing over zijn ontdekking van quasikristallen.

Een speciaal begin van dit unieke collegejaar 2020 – 2021: op woensdag 2 september vond de opening van het facultaire jaar online plaats vanuit het vernieuwde Arsenaalgebouw. De opening startte met een tafelgesprek met negen speciale gasten en werd gevolgd door een quiz en de uitreiking van de Facultaire…