A5020433872- Surface Chemistry and Catalysis
- Force Microscopy Techniques and Applications
- Molecular Junctions and Nanostructures
- Spectroscopy and Quantum Chemical Studies
- Organic and Molecular Conductors Research
- Chemistry and Chemical Engineering
- Surface and Thin Film Phenomena
- Hydrocarbon exploration and reservoir analysis
- Iron-based superconductors research
- Nanomaterials for catalytic reactions
- thermodynamics and calorimetric analyses
- Material Dynamics and Properties
- Calcium Carbonate Crystallization and Inhibition
- High-pressure geophysics and materials
- Inorganic Fluorides and Related Compounds
- nanoparticles nucleation surface interactions
- Membrane Separation and Gas Transport
- Covalent Organic Framework Applications
- Machine Learning in Materials Science
- Solid-state spectroscopy and crystallography
- Physics of Superconductivity and Magnetism
Bielefeld University
2023-2024
Johannes Gutenberg University Mainz
2016-2021
University of Applied Sciences Mainz
2018-2021
Stanford University
2020
SLAC National Accelerator Laboratory
2020
The authors explore the $R$Te${}_{3}$ family of materials as a clean model system in which to study quantum phase transition between single and double charge density wave states. Quantum oscillation measurements reveal significant reduction area Fermi surface across transition, but no obvious divergence electronic effective mass. Variation magnitude gap rare-earth series leads particularly clear example tunable magnetic breakdown.
Abstract It is usually assumed that molecules deposited on surfaces assume the most thermodynamically stable structure. Here we show, by considering a model system of dihydroxybenzoic acid (10.4) surface calcite, metastable molecular architectures may also be accessed choosing suitable initial state which defines observed transformation path. Moreover, demonstrate latter entirely controlled kinetics rather than thermodynamics. We argue are as dimers undergo, upon increase temperature, series...
The adsorption of water on calcite(104) is investigated in ultra-high vacuum by density functional theory (DFT) and non-contact atomic force microscopy (NC-AFM) the coverage regime up to one monolayer (ML). DFT calculations reveal a clear preference for adsorb bulk-like carbonate group rows (2 × 1) reconstructed surface. Additionally, an apparent attraction due reorientation suggest island formation adsorbed rows. Experimentally, found exclusively occupy specific positions within unit cell...
Molecular self-assembly, governed by the subtle balance between intermolecular and molecule–surface interactions, is generally associated with thermodynamic ground state, while competition kinetics thermodynamics during its formation often neglected. Here, we present a simple model system of benzoic acid derivative on bulk insulator surface. Combining high-resolution noncontact atomic force microscopy experiments density functional theory, characterize structure stability set...
Abstract Controlling the structure formation of molecules on surfaces is fundamental for creating molecular nanostructures with tailored properties and functionalities relies tuning subtle balance between intermolecular molecule-surface interactions. So far, however, reliable rules design are largely lacking, preventing controlled fabrication self-assembled functional structures surfaces. In addition, while so far many studies focused varying building blocks, impact systematically adjusting...
Abstract Controlling self-assembled nanostructures on bulk insulators at room temperature is crucial towards the fabrication of future molecular devices, e.g., in field nanoelectronics, catalysis and sensor applications. However, temperatures realistic for operation anchoring individual molecules electrically insulating support surfaces remains a big challenge. Here, we present formation an ordered array single anchored molecules, dimolybdenum tetraacetate, (10.4) plane calcite (CaCO 3 )....
Abstract Molecular processes at surfaces can be composed of a rather complex sequence steps. The kinetics even seemingly simple steps are demonstrated to depend on multitude factors, which prohibits applying Arrhenius law. This complexity make it challenging experimentally determine the kinetic parameters single step. However, molecular‐level understanding molecular such as structural transitions requires elucidating atomistic details individual Here, strategy is presented extract energy...
Abstract Phase transitions between different aggregate states are omnipresent in nature and technology. Conventionally, a crystalline phase melts upon heating as we use ice to cool drink. Already 1903, Gustav Tammann speculated about the opposite process, namely melting cooling. So far, evidence for such “inverse” real materials is rare limited few systems or extreme conditions. Here, demonstrate an inverse transition molecules adsorbed on surface. Molybdenum tetraacetate copper(111) forms...
How to extract the energy barrier of an individual step in a complex structural transition? In article number 1900795 by Simon Aeschlimann, Angelika Kühnle, and co-workers, strategy is presented disentangle involved steps addressing all factors that impact transition kinetics. The illustrated determining for dissociation molecular dimers on surface.
Abstract Phasenübergänge zwischen unterschiedlichen Aggregatzuständen sind in Natur und Technik allgegenwärtig. Üblicherweise schmilzt ein Kristall, wenn er erwärmt wird. Daher nutzen wir Eis, um einen Drink zu kühlen. Bereits im Jahre 1903 spekulierte Gustav Tammann über den umgekehrten Prozess des Schmelzens durch Kühlen. Bisher gibt es allerdings nur sehr wenige Beispiele für solche “inversen” Phasenübergänge, die meist auch auf extreme Bedingungen beschränkt sind. Hier zeigen inversen...
Mobilisierung beim Abkühlen Auf einer Kupferoberfläche adsorbierte Dimolybdäntetraacetat-Moleküle bilden bei Raumtemperatur eine geordnete Struktur aus aufrecht stehenden Molekülen. Beim auf 220 K werden die Moleküle der Oberfläche beweglich. Dieser kontraintuitive Phasenübergang von geordneten hohen Temperaturen zu mobilen Phase tiefen lässt sich durch geringere molare Entropie in im Vergleich zur erklären, wie Angelika Kühnle et al. ihrer Zuschrift S. 19265 berichten.