Raman Spectroscopy: Mutual Diffusion Coefficient in Hydrogels

Abstract:

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A hydrogel kept at its equilibrium swelling state during taking the measurements controlled in a diffusion cell. The diffusion data gained from Raman spectra were analyzed to calculate the mutual diffusion coefficient in the hydrogel as semi-infinite medium. The relation between the solute concentration and Raman intensity for poly(N-isopropylacrylamide), which is characterized by the distinct peak for the isopropyl group at 2925 cm-1 was taken into account. The determination of the mutual diffusion coefficient, Dmut for hydrogels/phenol system was achieved successfully using confocal Raman spectroscopy at different solute concentrations. At 25oC, the value of the mutual diffusion coefficient is found between 5.61845x10-11 m2/s and 3.34565x10-9 m2/s for the hydrogel loaded with phenol of an initial concentration of 0.01 mM and 0.1 mM, respectively.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 312-315)

Edited by:

Andreas Öchsner, Graeme E. Murch and João M.P.Q. Delgado

Pages:

193-198

DOI:

10.4028/www.scientific.net/DDF.312-315.193

Citation:

A.A. Naddaf and H.J. Bart, "Raman Spectroscopy: Mutual Diffusion Coefficient in Hydrogels", Defect and Diffusion Forum, Vols. 312-315, pp. 193-198, 2011

Online since:

April 2011

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Price:

$35.00

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