| Autor: |
Turton DA; University of Glasgow , School of Chemistry, WestCHEM, Glasgow G12 8QQ, U.K., Wynne K |
| Jazyk: |
angličtina |
| Zdroj: |
The journal of physical chemistry. B [J Phys Chem B] 2014 May 01; Vol. 118 (17), pp. 4600-4. Date of Electronic Publication: 2014 Apr 16. |
| DOI: |
10.1021/jp5012457 |
| Abstrakt: |
The Stokes-Einstein-Debye (SED) expression is used routinely to relate orientational molecular diffusivity quantitatively to viscosity. However, it is well-known that Einstein's equations are derived from hydrodynamic theory for the diffusion of a Brownian particle in a homogeneous fluid and examples of SED breakdown and failure for molecular diffusion are not unusual. Here, using optical Kerr-effect spectroscopy to measure orientational diffusion for solutions of guanidine hydrochloride in water and mixtures of carbon disulfide with hexadecane, we show that these two contrasting systems each show pronounced exception to the SED relation and ask if it is reasonable to expect molecular diffusion to be a simple function of viscosity. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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