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

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00008032
URN to cite this document: urn:nbn:de:bvb:703-epub-8032-1

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 der Verlagsversion: https://doi.org/10.1016/j.ijheatmasstransfer.2024.125602

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Abstract

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
Keywords:	Thermodiffusion; Diffusion; Soret effect; Polymer solutions
DDC Subjects:	500 Science > 530 Physics
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors > 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 Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-8032-1
Date Deposited:	21 Oct 2024 06:41
Last Modified:	23 Oct 2024 07:10
URI:	https://epub.uni-bayreuth.de/id/eprint/8032

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