in the repository
URN to cite this document: urn:nbn:de:bvb:703-epub-7083-8
Title data
Sommermann, D. ; Schraml, Marcel ; Köhler, Werner:
Thermodiffusion of polymer solutions and colloidal dispersions in mixed solvents.
In: The Journal of Chemical Physics.
Vol. 157
(2022)
Issue 19
.
- No. 194903.
ISSN 0021-9606
DOI der Verlagsversion: https://doi.org/10.1063/5.0128626
![[thumbnail of 194903_1_online.pdf]](https://epub.uni-bayreuth.de/style/images/fileicons/application_pdf.png) |
|
||||||||
|
Download (4MB)
|
Project information
| Project financing: |
Deutsche Forschungsgemeinschaft Deutsches Zentrum für Luft- und Raumfahrt |
|---|
Abstract
Two-color optical measurements of thermodiffusion in ternary mixtures frequently suffer from ill-conditioned contrast factor matrices, whose inversion leads to very large experimental errors. In this contribution, we show how the error amplification can be avoided in situations where a priori knowledge about the directions of the eigenvectors of the diffusion matrix is available. We present optical beam deflection experiments on solutions of the polymer polystyrene of Mw = 4880 g/mol in a mixed solvent of toluene and cyclohexane. In this system, the two diffusion eigenvalues differ by almost one order of magnitude. The large eigenvalue can be attributed to the interdiffusion of the two solvents and the small one to the polymer diffusion relative to the mixed solvent. The pre-selection of the eigenvectors renders the method stable against fluctuations of the experimental parameters. Both the diffusion and the Soret coefficients attributed to the two modes agree very well with the respective values of corresponding binary mixtures.
Further data
| Item Type: | Article in a journal |
|---|---|
| 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-7083-8 |
| Date Deposited: | 12 Jul 2023 06:27 |
| Last Modified: | 22 Sep 2023 11:03 |
| URI: | https://epub.uni-bayreuth.de/id/eprint/7083 |
Download Statistics