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

โœ Scribed by Fumiaki Tsunomori; Hideharu Ushiki

Book ID
104337519
Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
137 KB
Volume
258
Category
Article
ISSN
0375-9601

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โœฆ Synopsis

We report that the reduction of the diffusion coefficient of rhodamine B molecules 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 function of temperature. Assuming the gel network is homogeneous, the average value 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 viscosity was well evaluated based on the probability of which a rhodamine B molecule passes through a pore.

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