A5056712727- Phase Equilibria and Thermodynamics
- Thermodynamic properties of mixtures
- Chemical Thermodynamics and Molecular Structure
- Ionic liquids properties and applications
- Adsorption, diffusion, and thermodynamic properties of materials
- Field-Flow Fractionation Techniques
- Diffusion Coefficients in Liquids
- Carbon Dioxide Capture Technologies
- Chemical and Physical Properties in Aqueous Solutions
- Hybrid Renewable Energy Systems
- Spacecraft and Cryogenic Technologies
- Heat Transfer and Boiling Studies
- Electrochemical Analysis and Applications
- Fluid Dynamics and Heat Transfer
- Surface Modification and Superhydrophobicity
- Material Dynamics and Properties
- Ion-surface interactions and analysis
- Catalysis and Oxidation Reactions
- Nanofluid Flow and Heat Transfer
- nanoparticles nucleation surface interactions
- Diamond and Carbon-based Materials Research
- Gas Dynamics and Kinetic Theory
- Heat Transfer and Optimization
- Hydrogen Storage and Materials
- Molecular Junctions and Nanostructures
Friedrich-Alexander-Universität Erlangen-Nürnberg
2015-2024
Technische Universität Berlin
2012
Technische Universität Dresden
2012
The liquid density, kinematic viscosity, and surface tension of the segregated hydrofluoroethers (HFEs) HFE-7000 (1,1,1,2,2,3,3-heptafluoro-3-methoxy-propane), HFE-7100 (mixture isomers 1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxy-butane 1,1,1,2,3,3-hexafluoro-3-methoxy-2-(trifluoromethyl)propane), HFE-7200 1-ethoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane 1-ethoxy-1,1,2,3,3,3-hexafluoro-2-(trifluoromethyl)propane), HFE-7300 (1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)pentane), HFE-7500...
In the present study, simultaneous and accurate determination of liquid viscosity surface tension
Abstract The present article summarizes experimental and theoretical considerations required for a proper use of dynamic light scattering (DLS) the measurement transport properties fluids. It addresses not only recent advancements method, but also aims to provide recommendations researchers who intend apply technique in future. As outlined this study, DLS is based on analysis scattered governed by microscopic statistical or periodic fluctuations that originate from thermal movement molecules...
The present contribution provides experimental data for the liquid viscosity and surface tension of n-alkane based model systems at temperatures up to 573 K. fundamental advantage used light scattering (SLS) method lies in its application thermodynamic equilibrium without calibration a contactless way. investigated comprise pure fluids n-dodecane (n-C12H26) n-octacosane (n-C28H58), their binary mixture n-C12H26 mole fraction about 0.3, commercially available hydrocarbon wax SX-70...
This work contributes to the characterization of long linear and branched alkanes alcohols via determination their thermophysical properties up temperatures 573.15 K. For this, experimental techniques including surface light scattering (SLS) molecular dynamics (MD) simulations were used under equilibrium conditions analyze influences chain length, branching, hydroxylation on liquid density, viscosity, tension. probing these effects, 12 pure model systems given by n-dodecane, n-hexadecane,...
In this work density data for binary mixtures of the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate ([EMIM][EtSO4]) with acetone, acetonitrile, propylene carbonate, dichloromethane, methanol, ethanol, and water are presented. Measurements were performed in dependence on composition temperatures from (278.15 to 308.15) K using vibrating-tube method an expanded relative uncertainty (k = 2) less than ± 0.02 %. All calculated excess molar volumes negative, indicating denser molecular...
Thermophysical properties of the ionic liquid (IL) [EMIM][B(CN)4] (1-ethyl-3-methylimidazolium tetracyanoborate) were investigated both by conventional techniques and surface light scattering (SLS) at atmospheric pressure. The density was measured between (283.15 363.15) K with a vibrating U-tube densimeter. An Abbe refractometer used for measurement refractive index in range from to 313.15) K. Self-diffusion coefficients cation anion nuclear magnetic resonance (NMR) spectroscopy (273.15...
In the present study, dynamic light scattering (DLS) experiments and molecular dynamics (MD) simulations were used for investigation of diffusion in binary mixtures liquids with dissolved gases at macroscopic thermodynamic equilibrium. Model systems based on n-alkane n-hexane or n-decane hydrogen, helium, nitrogen, carbon monoxide studied temperatures between 303 423 K gas mole fractions below 0.06. With DLS, relaxation behavior microscopic equilibrium fluctuations concentration temperature...
The influence of the strength intermolecular interactions on mass diffusive processes remains poorly understood for mixtures associative liquids with dissolved gases. For contributing to a fundamental understanding interplay between liquid structures and diffusivities in such systems, dynamic light scattering, Raman spectroscopy, molecular dynamics simulations were used this work. As model binary consisting gases hydrogen, helium, nitrogen, carbon monoxide, or dioxide ethanol, 1-hexanol,...
Abstract In the present study, effective thermal conductivity of nanoparticle dispersions, so-called nanofluids, is investigated experimentally and theoretically. For probing influence nanoparticles on dispersions with water as liquid continuous phase, nearly spherical monodisperse titanium dioxide (TiO 2 ), silicon (SiO polystyrene (PS) strongly varying conductivities were used model systems. measurement nanofluids particle volume fractions up to 0.31, a steady-state guarded parallel-plate...
This work contributes to an improved understanding of the fluid-phase behavior and diffusion processes in mixtures 1-hexanol carbon dioxide (CO2) at temperatures around upper critical end point (UCEP) system. Raman spectroscopy dynamic light scattering were used determine composition saturation conditions as well Fick thermal diffusivities. An acceleration diffusive process up CO2 mole fractions about 0.2 was found, followed by a strong slowing-down approaching vapor–liquid–liquid...
Liquid organic hydrogen carrier (LOHC) systems constitute a very promising concept for future storage and logistics. The builds on the conversion of excess renewable energy to via electrolysis followed by reversible catalytic hydrogenation/dehydrogenation diesel-like molecule. For an ideal design process, insight into reaction mechanisms kinetics but also precise knowledge mass transport properties are necessary. In present study, binary diffusion coefficients in selected LOHC mixtures with...
It is demonstrated that thermal and mutual diffusivities of binary mixtures n-octacosane (n-C28H58) with carbon monoxide (CO), hydrogen (H2), water (H2O) are simultaneously accessible by dynamic light scattering (DLS). As the light-scattering signals originating from concentration fluctuations appear in similar time scales, different data evaluation strategies were tested to achieve minimum uncertainties resulting transport properties. To test agreement respective theoretical model DLS...
This study contributes to a fundamental understanding of how the liquid structure in model system consisting weakly associative n-hexane (n-C6H14) and carbon dioxide (CO2) influences Fickian diffusion process. For this, benefits light scattering experiments molecular dynamics (MD) simulations at macroscopic thermodynamic equilibrium were combined synergistically. Our reference diffusivities measured by dynamic (DLS) revealed an unusual trend with increasing CO2 mole fractions up about 70 mol...
Ionic liquids (ILs) are promising solvents for gas separation processes such as carbon dioxide (CO2) capture from flue gases. For the design of corresponding and apparatus, thermophysical properties ILs containing dissolved gases required. In present study, it is demonstrated that with a single optical setup, mutual thermal diffusivities well refractive indices can be measured quasi-simultaneously mixtures. Dynamic light scattering (DLS) bulk fluids was applied to determine mixtures...