Tobias Klein

Tobias Klein, M. Sc.

Group Leader "Thermophysical Properties of Working Fluids in Energy Technology"

Department of Chemical and Biological Engineering (CBI)
Institute of Advanced Optical Technologies - Thermophysical Properties

Paul-Gordan-Straße 8
91052 Erlangen
Germany

Research focus of the group “Thermophysical Properties of Working Fluids in Energy Technology”

The research activities of the group focus on the characterization of working fluids in energy technology through the determination of their thermophysical properties using both conventional and light scattering experiments as well as molecular dynamics (MD) simulations. For the design of processes and apparatuses in energy technology, equilibrium properties of working fluids, such as density and surface tension, as well as their transport properties, like viscosity and thermal as well as mass diffusivities have to be known. At present, electrolytes and hydrocarbon-based systems with dissolved gases, which play an important role for energy transport and storage, are of special interest in the group. By combining experiments and simulations, not only a reliable determination of thermophysical properties can be achieved, but also a fundamental understanding of their dependencies on the molecular and fluid structure. This knowledge contributes to the development of structure-property relationships and semi-empirical equations for the prediction of thermophysical properties of working fluids relevant in energy technology.

Publications:

2020

Kerscher M., Klein T., Schulz P., Veroutis E., Dürr S., Preuster P., Koller TM., Rausch MH., Economou IG., Wasserscheid P., Fröba AP.:
Thermophysical properties of diphenylmethane and dicyclohexylmethane as a reference liquid organic hydrogen carrier system from experiments and molecular simulations
In: International Journal of Hydrogen Energy 45 (2020), p. 28903-28919
ISSN: 0360-3199
DOI: 10.1016/j.ijhydene.2020.07.261
Klein T., Lenahan F., Kerscher M., Rausch MH., Economou IG., Koller TM., Fröba AP.:
Characterization of Long Linear and Branched Alkanes and Alcohols for Temperatures up to 573.15 K by Surface Light Scattering and Molecular Dynamics Simulations
In: Journal of Physical Chemistry B 124 (2020), p. 4146-4163
ISSN: 1520-6106
DOI: 10.1021/acs.jpcb.0c01740
Klein T., Piszko M., Lang M., Mehler J., Schulz P., Rausch MH., Giraudet C., Koller TM., Fröba AP.:
Diffusivities in Binary Mixtures of [AMIM][NTf2] Ionic Liquids with the Dissolved Gases H2, He, N2, CO, CO2, or Kr Close to Infinite Dilution
In: Journal of Chemical and Engineering Data 65 (2020), p. 4116–4129
ISSN: 0021-9568
DOI: 10.1021/acs.jced.0c00430
Koller TM., Lenahan F., Schmidt P., Klein T., Mehler J., Maier F., Rausch MH., Wasserscheid P., Steinrück HP., Fröba AP.:
Surface Tension and Viscosity of Binary Mixtures of the Fluorinated and Non-fluorinated Ionic Liquids [PFBMIm][PF6] and [C4C1Im][PF6] by the Pendant Drop Method and Surface Light Scattering
In: International Journal of Thermophysics 41 (2020), Article No.: 144
ISSN: 0195-928X
DOI: 10.1007/s10765-020-02720-w
Piszko M., Hewa Kankanamge CJK., Rausch MH., Klein T., Fröba AP.:
Dynamic light scattering for studying mutual diffusion coefficients in electrolyte systems comprised entirely of ions
In: Journal of The Electrochemical Society 167 (2020), Article No.: abb97d
ISSN: 0013-4651
DOI: 10.1149/1945-7111/abb97d
Wu W., Klein T., Kerscher M., Rausch MH., Koller TM., Giraudet C., Fröba AP.:
Mutual and Thermal Diffusivities as Well as Fluid-Phase Equilibria of Mixtures of 1-Hexanol and Carbon Dioxide
In: Journal of Physical Chemistry B 124 (2020), p. 2482-2494
ISSN: 1520-6106
DOI: 10.1021/acs.jpcb.0c00646

2019

Klein T., Cui J., Kalantar A., Chen J., Rausch MH., Koller TM., Fröba AP.:
Liquid Viscosity and Interfacial Tension of Binary and Ternary Mixtures Containing n-Octacosane by Surface Light Scattering
In: Journal of Chemical and Engineering Data 64 (2019), p. 817-826
ISSN: 0021-9568
DOI: 10.1021/acs.jced.8b01139
Klein T., Yan S., Cui J., Magee JW., Kroenlein K., Rausch MH., Koller TM., Fröba AP.:
Liquid Viscosity and Surface Tension of n-Hexane, n-Octane, n-Decane, and n-Hexadecane up to 573 K by Surface Light Scattering
In: Journal of Chemical and Engineering Data 64 (2019), p. 4116-4131
ISSN: 0021-9568
DOI: 10.1021/acs.jced.9b00525
Koller TM., Prucker T., Cui J., Klein T., Fröba AP.:
Interfacial tensions and viscosities in multiphase systems by surface light scattering (SLS)
In: Journal of Colloid and Interface Science 538 (2019), p. 671-681
ISSN: 0021-9797
DOI: 10.1016/j.jcis.2018.11.095
Koller TM., Yan S., Steininger C., Klein T., Fröba AP.:
Interfacial Tension and Liquid Viscosity of Binary Mixtures of n-Hexane, n-Decane, or 1-Hexanol with Carbon Dioxide by Molecular Dynamics Simulations and Surface Light Scattering
In: International Journal of Thermophysics 40 (2019), Article No.: 79
ISSN: 0195-928X
DOI: 10.1007/s10765-019-2544-y
Wu W., Klein T., Kerscher M., Rausch MH., Koller TM., Giraudet C., Fröba AP.:
Diffusivities in 1-alcohols containing dissolved H2, He, N2, CO, or CO2 close to infinite dilution
In: Journal of Physical Chemistry B 123 (2019), p. 8777–8790
ISSN: 1520-6106
DOI: 10.1021/acs.jpcb.9b06211

2018

Giraudet C., Klein T., Zhao G., Rausch MH., Koller TM., Fröba AP.:
Thermal, Mutual, and Self-Diffusivities of Binary Liquid Mixtures Consisting of Gases Dissolved in n-Alkanes at Infinite Dilution
In: Journal of Physical Chemistry B 122 (2018), p. 3163-3175
ISSN: 1520-6106
DOI: 10.1021/acs.jpcb.8b00733
Klein T., Cui J., Kalantar A., Chen J., Rausch MH., Koller TM., Fröba AP.:
Viscosity and Surface Tension of Branched Alkanes 2-Methylnonane and 4-Methylnonane
In: Journal of Chemical and Engineering Data 63 (2018), p. 2833-2839
ISSN: 0021-9568
DOI: 10.1021/acs.jced.8b00163
Klein T., Wu W., Rausch MH., Giraudet C., Koller TM., Fröba AP.:
Influence of Liquid Structure on Fickian Diffusion in Binary Mixtures of n-Hexane and Carbon Dioxide Probed by Dynamic Light Scattering, Raman Spectroscopy, and Molecular Dynamics Simulations
In: Journal of Physical Chemistry B 122 (2018), p. 7122-7133
ISSN: 1520-6106
DOI: 10.1021/acs.jpcb.8b03568

2017

Koller TM., Klein T., Chen J., Kalantar A., van der Laan GP., Rausch MH., Fröba AP.:
Simultaneous Analysis of Equilibrium Fluctuations at the Surface and in the Bulk of a Binary Liquid Mixture by Dynamic Light Scattering
In: Journal of Physical Chemistry B 121 (2017), p. 10950-10956
ISSN: 1520-6106
DOI: 10.1021/acs.jpcb.7b09770
Koller TM., Klein T., Giraudet C., Chen J., Kalantar A., van der Laan GP., Rausch MH., Fröba AP.:
Liquid Viscosity and Surface Tension of n-Dodecane, n-Octacosane, Their Mixtures, and a Wax between 323 and 573 K by Surface Light Scattering
In: Journal of Chemical and Engineering Data 62 (2017), p. 3319-3333
ISSN: 0021-9568
DOI: 10.1021/acs.jced.7b00363