58 zoekresultaten voor “crystal” in de Publieke website
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Crystal Ennis
Faculteit der Geesteswetenschappen
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A new method to reconstruct the structure from crystal images
Promotor: J.P. Abrahams, Co-promotor: T. Grüne
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The symmetry of crystals and the topology of electrons
Promotor: J. Zaanen, Co-Promotor: V. Juricic
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structure dependencies of gas-surface interactions with curved single crystals
Curved single crystals provide variable, but well-defined surface structures.
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On shape and elasticity: bio-sheets, curved crystals, and odd droplets
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.
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Adsorption and catalysis on Pt and Pd monolayer-modified Pt single crystal electrodes
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.
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It's just a phase: High-contrast imaging with patterned liquid-crystal phase plates to facilitate characterization of exoplanets
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.
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Platinum electrochemistry through a magnifying glass
In most applications, electrocatalysts exhibit a large surface area to volume ratio, for example using nanoparticles.
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Surface-structure dependencies in catalytic reactions
Promotor: M.T.M. Koper, Co-Promotor: L.B.F. Juurlink
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This is life: some thoughts on self-organized structure formation in active liquids and biological systems
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.
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Gauge theory and nematic order : the rich landscape of orientational phase transition
Promotor: J. Zaanen
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Structure dependence of molecular reactions on surfaces
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.
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On the geometry of fracture and frustration
Promotor: Prof.dr. M.L. van Hecke, Co-Promotor: V. Vitelli
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Photosynthetic light reactions at the gold interface
Promotor: T.J. Aartsma, Co-promotor: R.N. Frese
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Steps in gas-surface reactions
Heterogeneous catalysis is essential to many industrial applications. These catalysts are often comprised of supported nanoparticles, which contain various different surface sites.
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Suppressing a Sea of Starlight: Enabling technology for the direct imaging of exoplanets
Promotor: Christoph U. Keller, Co-promotores: Matthew A. Kenworthy, Frans Snik
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The road to insurmountability: Novel avenues to better target CC Chemokine receptors
This thesis explores different avenues to develop insurmountable antagonists for CC Chemokine Receptors, such as CCR1, CCR2 and CCR5.
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Topology and Geometry in Chiral Liquids
We study the interplay of topology and geometry with chirality for several passive and active systems, employing both analytical and numerical methods.
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Low-temperature spectroscopic studies of single molecules in 3-D and on 2-D hosts
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…
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Microscopy and Spectroscopy on Model Catalysts in Gas Environments
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.
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Drie quantumveilige cryptografiemethoden gestandaardiseerd voor wereldwijd gebruik
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)…
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Probing molecular layers with low-energy electrons
Molecular materials have been a subject of interest in fundamental research and applications for decades, and have been studied as bulk crystals, (thin) films and as individual molecules, due to the large variety in their properties. This dissertation explores pentacene crystals near the two-dimensional…
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Assembling anisotropic colloidal building blocks
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.
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Spin-momentum locking in oxide interfaces and in Weyl semimetals
Electrons in a crystal lattice have properties that may differ from those of a free electron in vacuum.
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Allosteric modulation by sodium ions and amilorides of G protein-coupled receptors
Promotor: A.P. IJzerman
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Allosteric modulation by sodium ions and amilorides of G protein- coupled receptors
Promotor: A.P. IJzerman
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Materialen van zelf-draaiende deeltjes
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.…
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On the shape and elasticity of bio-sheets, curved crystals, and odd droplets
Promotie
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Interaction of oxygen and carbon monoxide with Pt(111) at intermediate pressure and temperature: revisiting the fruit fly of surface science
Promotor: M.T.M. Koper, Co-promotors: A.I. Yanson, L.B.F. Juurlink
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Cathodic corrosion
Cathodic corrosion is a relatively unknown phenomenon that can severely etch metallic electrodes at cathodic (negative) potentials.
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Magnetic imaging of spin waves and magnetic phase transitions with nitrogen-vacancy centers in diamond
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.
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Molecular and Nano-Engineering with Iron, Ruthenium and Carbon: Hybrid structures for Sensing
Metal complexes and 2D materials like graphene were combined to produce structures that can function as sensors.
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Geometry and Topology in Active and Driven Systems
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).
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Exploring chemical space in covalent and competitive glycosidase inhibitor design
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
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Fundamental research on the voltammetry of polycrystalline gold
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.
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Painting with starlight : optical techniques for the high-contrast imaging of exoplanets
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.
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Structural characterization of bacterial proteins involved in antibiotic resistance and peptidoglycan biosynthesis
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.
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Ab initio molecular dynamics calculations on reactions of molecules with metal surfaces
Promotor: Prof.dr. G.J. Kroes
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Another Brick in the Wall: The role of the actinobacterial cell wall in antibiotic resistance, phylogeny and development
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.
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Software developments in automated structure solution and crystallographic studies of the Sso10a2 and human C1 inhibitor protein
Promotor: Prof.dr. J.P. Abrahams, Co-Promotor: N.S. Pannu
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Stable single molecules for quantum optics and all-optical switches
Promotor: Prof.dr. M.A.G.J. Orrit
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En de winnaar is... Resultaten van de jaarlijkse fotowedstrijd natuurkunde
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.
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Lezing Nobelprijswinnaar Chemie professor Dan Shechtman
Dan Shechtman, Nobelprijswinnaar Chemie 2011, geeft op woensdag 19 februari 2014 bij de Universiteit Leiden een lezing over zijn ontdekking van quasikristallen.
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Nieuwe theorie voor vloeibare kristallen met hoge symmetrie
LCD-schermen gebruiken vloeibare kristallen die weliswaar een vloeistof vormen maar toch in hoge mate geordend zijn. Een nieuwe theorie brengt nu het samenspel in kaart tussen orde, temperatuur en symmetrie. Publicatie in Physical Review X.
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Rachel Doherty wint de LION Image Award met viraal microbootje
De jaarlijkse LION Image award gaat naar de foto van een 30 micrometer lang 3D-geprint bootje dat in oktober viraal ging, ingediend door Rachel Doherty van de groep van Daniela Kraft.
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Natuurkunde in beeld: kankercellen als een explosie van vuurwerk
Denk jij bij natuurkunde alleen aan ingewikkelde formules? Dan ben je niet de enige. Daarom organiseert het Leids Instituut voor Natuurkunde elk jaar de LION Image Award om een andere kant van natuurkunde te laten zien: mooie beelden over intrigerende wetenschap. De winnaar van de fotowedstrijd van…
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Drie van de vier NWO-TOP subsidies voor Leiden
NWO heeft landelijk vier TOP subsidies toegekend voor wetenschappelijk onderzoek, drie daarvan gingen naar Leiden. In totaal zijn er landelijk 24 voorstellen ingediend. Naast de gehonoreerde subsidie van professor Ad IJzerman, waarover eerder werd gepubliceerd, zijn ook de voorstellen van professor…
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Technology & Innovation
De onderzoeksgroep Business, Technology & Public Policy van de afdeling Bedrijfswetenschappen van Universiteit leiden houdt zich bezig met het onderzoeken van de dynamische wisselwerking tussen ‘nieuwe’ technologieën en de verschillende belanghebbenden die hiermee interacteren, waaronder consumenten,…
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Europese routekaart voor toepassing van grafeen in wetenschap en technologie
Meer dan 60 Europese wetenschappers en partners uit het bedrijfsleven ontvouwen in het tijdschrift Nanoscale hun stappenplan voor de toepassing van grafeen in producten voor de markt. Scheikundige Grégory Schneider gelooft dat grafeen en andere gelaagde materialen in de toekomst gebruikt kunnen worden…
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Losse moleculen tonen belofte om losse elektronen te zien met licht
Het is nog nooit gelukt om een enkel elektron te detecteren met zichtbaar licht via slechts één molecuul. Leids natuurkundige Michel Orrit en zijn onderzoeksgroep hebben nu een molecuul geïdentificeerd dat gevoelig genoeg is om een elektron te detecteren op een afstand van honderden nanometers. De resultaten…