Pore size effect on diffusion coefficient of rhodamine B in PNIPA gel

Citation
F. Tsunomori et H. Ushiki, Pore size effect on diffusion coefficient of rhodamine B in PNIPA gel, PHYS LETT A, 258(2-3), 1999, pp. 171-176
Citations number
21
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS A
ISSN journal
03759601 → ACNP
Volume
258
Issue
2-3
Year of publication
1999
Pages
171 - 176
Database
ISI
SICI code
0375-9601(19990719)258:2-3<171:PSEODC>2.0.ZU;2-H
Abstract
We report that the reduction of the diffusion coefficient of rhodamine B mo lecules in a poly(N-isopropylacrylamide) gel is well explained by the pore size effect of a gel network. The diffusion coefficient was calculated from the time development of the concentration profile at different temperature . The coefficient decreased with decreasing the shrink ratio that is a func tion of temperature. Assuming the gel network is homogeneous, the average v alue of the pore size could be estimated as a function of the shrink ratio. The pore size effect on the diffusion coefficient via the apparent viscosi ty was well evaluated based on the probability of which a rhodamine B molec ule passes through a pore. (C) 1999 Published by Elsevier Science B.V. All rights reserved.