Temperature dependence of the diffusion, thermodiffusion and Soret coefficient of a dilute polystyrene/toluene solution as measured by means of a transient holographic grating technique

Title data

Kantelhardt, Jannik ; Sommermann, Daniel ; Köhler, Werner:
Temperature dependence of the diffusion, thermodiffusion and Soret coefficient of a dilute polystyrene/toluene solution as measured by means of a transient holographic grating technique.
In: International Journal of Heat and Mass Transfer. Vol. 228 (2024) . - 125602.
ISSN 0017-9310
DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2024.125602

Official URL:

Abstract in another language

We have measured diffusion, thermodiffusion and Soret coefficients of a dilute solution of polystyrene in toluene by means of the transient holographic grating technique of thermal diffusion forced Rayleigh scattering over a temperature range from 10 to 50 °C. The results show a systematic deviation from optical beam deflection measurements over a narrower temperature interval of the order of ten percent but the identical temperature dependence. A comparison with previous measurements from our laboratory, new control measurements and literature data does not lead to a clear conclusion about the correct values. From the diffusion coefficient a temperature independent hydrodynamic radius is obtained. Both the Soret coefficient and the viscosity-scaled thermodiffusion coefficient ηDT, for which a universal value has been reported in the case of asymmetric systems with large solute entities, decrease with temperature.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Keywords:	Thermodiffusion; Diffusion; Soret effect; Polymer solutions
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics IV > Professor Experimental Physics IV - Univ.-Prof. Dr. Werner Köhler Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics IV
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 530 Physics
Date Deposited:	26 Oct 2024 21:00
Last Modified:	28 Oct 2024 06:31
URI:	https://eref.uni-bayreuth.de/id/eprint/90866