A5041281526- nanoparticles nucleation surface interactions
- Theoretical and Computational Physics
- Surface and Thin Film Phenomena
- Advanced Chemical Physics Studies
- Advanced X-ray Imaging Techniques
- X-ray Diffraction in Crystallography
- X-ray Spectroscopy and Fluorescence Analysis
- Spectroscopy and Quantum Chemical Studies
- Mesoporous Materials and Catalysis
- Magnetic properties of thin films
- Zeolite Catalysis and Synthesis
- High-pressure geophysics and materials
- Material Dynamics and Properties
- Ionic liquids properties and applications
- Electron and X-Ray Spectroscopy Techniques
- Particle Accelerators and Free-Electron Lasers
- Thermodynamic and Structural Properties of Metals and Alloys
- Quantum, superfluid, helium dynamics
- Microstructure and mechanical properties
- Phase Equilibria and Thermodynamics
- Electrochemical Analysis and Applications
- Crystallography and Radiation Phenomena
- Advanced X-ray and CT Imaging
- Electronic and Structural Properties of Oxides
- Advanced Materials Characterization Techniques
European Synchrotron Radiation Facility
2013-2024
Deutsches Elektronen-Synchrotron DESY
2022-2024
European Science Foundation
2010-2022
Nova Photonics (United States)
2022
Max Planck Institute for Intelligent Systems
2005-2014
Max Planck Society
2004-2014
Stuttgart Observatory
2014
Max Planck Institut für Zellbiologie
2013
Elkhorn Slough Foundation
2013
Technical University of Munich
2010
Room-temperature ionic liquids (RTILs) are promising candidates for a broad range of "green" applications, which their interaction with solid surfaces plays crucial role. In this high-energy x-ray reflectivity study, the temperature-dependent structures three tris(pentafluoroethyl)trifluorophosphate anion in contact charged sapphire substrate were investigated submolecular resolution. All RTILs show strong interfacial layering, starting cation layer at and decaying exponentially into bulk...
The knowledge of the microscopic structure water at interfaces is essential for understanding interfacial phenomena in numerous natural and technological environments. To study deeply buried liquid water–solid interfaces, high-energy x-ray reflectivity measurements have been performed. Silicon wafers, functionalized by a self-assembled monolayer octadecyl-trichlorosilane, provide strongly hydrophobic substrates. We show density profiles with angstrom resolution near solid–liquid interface...
The physical behavior of condensed matter can be drastically altered in the presence interfaces. Using a high-energy x-ray transmission-reflection scheme, we have studied ice-SiO2 model We observed formation quasiliquid layer below bulk melting temperature and determined its thickness density as function temperature. has stronger correlations than water large close to rho(HDA)=1.17 g/cm(3) high-density amorphous ice suggesting structural relationship with postulated liquid phase water.
The structure of two model room temperature ionic liquids, [BMIM](+)[PF(6)](-) and [BMIM](+)[BF(4)](-), near the solid/liquid interface with charged Al(2)O(3)(0001) (sapphire) was determined subnanometer resolution by high energy (72.5 keV) x-ray reflectivity. exhibits alternately charged, exponentially decaying, near-surface layering. By contrast, smaller-anion compound, shows only a single layer enhanced electron density at interface. different layering behaviors, their characteristic...
Abstract Driven by the continuous search for improving performances, understanding phenomena at electrode/electrolyte interfaces has become an overriding factor success of sustainable and efficient battery technologies mobile stationary applications. Toward this goal, rapid advances have been made regarding simulations/modeling techniques characterization approaches, including high‐throughput electrochemical measurements coupled with spectroscopies. Focusing on Li‐ion batteries, current...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption by MFI-type zeolites examined isothermal microcalorimetry and neutron diffraction. 1. Argon, krypton, methaneP. L. Llewellyn, J. P. Coulomb, Y. Grillet, Patarin, H. Lauter, Reichert, RouquerolCite this: Langmuir 1993, 9, 7, 1846–1851Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July...
The density deficit of water at hydrophobic interfaces, frequently called the gap, has been subject numerous experimental and theoretical studies in past decade. Recent experiments give values for interfacial depletion that consistently correspond to less than a monolayer water. main question which remained so far unanswered is its origin mechanisms affected by chemistry molecular geometry particular coating. In this work, we present combined high-energy X-ray reflectivity dynamics...
The molecular-scale structure of the ionic liquid [C 18 mim] + [FAP] − near its free surface was studied by complementary methods. X-ray absorption spectroscopy and resonant soft reflectivity revealed a depth-decaying near-surface layering. Element-specific interfacial profiles were extracted with submolecular resolution from energy-dependent data. Temperature-dependent hard reflectivity, small- wide-angle scattering, infrared uncovered an intriguing melting mechanism for layered region,...
The European Synchrotron Radiation Facility (ESRF) has recently commissioned the new Extremely Brilliant Source (EBS). gain in brightness as well continuous development of beamline instruments boosts performances, particular terms accelerated data acquisition. This motivated access modes an alternative to standard proposals for beamtime, via "block allocation group" (BAG) mode. Here, we present implemented "historical materials BAG": a community proposal giving 10 institutes opportunity...
We present a high energy x-ray reflectivity study of the density profiles water and ice at hydrophobic hydrophilic substrates. At water/octadecyl-trichlorosilane (water-OTS) interface, we find clear evidence for thin depletion layer with an integrated deficit corresponding to approximately 40% monolayer molecules. discuss experimental results in terms simple model hydrophobic/hydrophilic solid-liquid interfaces. Our also exclude presence nanobubbles. A detailed possible radiation damage...
Water-dispersed silica nanoparticles (NPs) do not adsorb to the interface between immiscible bulks of water and hexane. Adding, however, a surfactant (cetyltrimethylammonium bromide, CTAB) induces formation NP monolayer (ML) at this model liquid–liquid interface. We determined ML's structure in situ deeply buried planar water–hexane interfaces with sub-nanometer resolution by high energy X-ray reflectivity. Detailed modeling data yields NPs' interfacial concentration immersion depth,...
The influence of the polar, aprotic solvent propylene carbonate on interfacial structure ionic liquid (IL) 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate sapphire was investigated by high-energy x-ray reflectivity. Experiments at concentrations between 17 mol. % and 83 bridge gap diluted electrolytes described classical Gouy-Chapman theory pure liquids. Analysis our experimental data revealed profiles comprised alternating anion cation enriched regions decaying...
First real-time studies of ultra-fast processes by single-bunch imaging at the European Synchrotron Radiation Facility are reported. By operating storage ring ESRF in mode with its correspondingly increased electron bunch charge density per singlet, polychromatic photon flux insertion-device beamlines is sufficient to capture hard X-ray images exploiting light from a single (the corresponding length 140 ps FWHM). Hard absorption contrast as well phase combination large propagation distances...
Abstract Li‐ion batteries are the essential energy‐storage building blocks of modern society. However, producing ultra‐high electrochemical performance in safe and sustainable for example, e‐mobility, portable stationary applications, demands overcoming major technological challenges. Materials engineering new chemistries key aspects to achieving this objective, intimately linked use advanced characterization techniques. In particular, operando investigations currently attracting enormous...
We demonstrate that crystal truncation rod scattering can ideally be applied to extract detailed information on surface segregation profiles in multicomponent systems. present an x-ray study of the at C${\mathrm{u}}_{3}$Au(001) various temperatures above order-disorder transition temperature. It exhibits a pronounced exponentially decaying, oscillatory behavior versus depth. The associated decay length $\ensuremath{\Lambda}$ is found obey...
We present an experimental study of the surface effects on order-disorder phase transition in binary alloy ${\mathrm{Cu}}_{3}$Au. By x-ray scattering under condition total external reflection, we obtained depth profiles order parameter at (001) when temperature ${\mathit{T}}_{0}$ is approached. The scattered intensity analyzed framework distorted-wave Born approximation, which briefly outlined. and dependence evanescent (100) superlattice consistent with a wetting transition, driven by...
Hydrophobicity, the spontaneous segregation of oil and water, can be modified by surfactants. The way this modification occurs is studied at oil–water interface for a range alkanes two ionic A liquid interfacial monolayer, consisting mixture alkane molecules surfactant tails, found. Upon cooling, it freezes T s , well above alkane’s bulk freezing temperature, b . monolayer’s phase diagram, derived surface tensiometry, accounted mixtures-based theory. structure measured high-energy X-ray...
Significance This high-resolution X-ray study resolves the liquid–air interface structure for a long homologous series of room temperature ionic liquids (RTILs). RTILs are intensely studied many potential “green” applications and their intriguingly complex rare combination intermolecular interactions. Varying cation’s alkyl chain length provides, therefore, an opportunity to tune main interaction from mostly long-range electrostatic short-range van der Waals. variation is found here drive...
Recent measurements of the momentum distribution in water and ice have shown that proton is a considerably softer potential Ih than or free monomer. This broadly consistent with large red shift observed vibrational spectrum. We show existing models, which treat intramolecular as unchanged by hydrogen bonding are unable to reproduce distribution. In addition, even if they can substantially explain increase intensity infrared spectrum going from monomer Ih. inclusion bond dipole derivative...