Analytical Sciences

Permeation Flux of Organic Molecules through Silica-surfactant Nanochannels in a Porous Alumina Membrane

Tomohisa YAMASHITA,* Shuji KODAMA,* Mikiya OHTO,* Eriko NAKAYAMA,* Sumiyo HASEGAWA,* Nobutaka TAKAYANAGI,* Tomoko KEMMEI,* Akira YAMAGUCHI,**^,*** Norio TERAMAE,** and Yukio SAITO*

*Toyama Institute of Health, 17-1 Nakataikoyama, Imizu, Toyama 939-0363, Japan
**Department of Chemistry, Graduate School of Science, Tohoku University, Aoba, Sendai 980-8578, Japan
***PRESTO, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan

The permeation fluxes of phenol, benzene sulfonate (BS) and benzene disulfonate (BDS) through a porous anodic alumina membrane with the perpendicularly oriented silica-surfactant nanochannel assembly membrane (NAM) were measured in water-ethanol mixture media. The permeation flux depended on solute charges and on solvent composition. As the ethanol ratio increased, the fluxes of BS and BDS increased and the flux of phenol decreased. The results of extraction/elution experiments also depended on the solute charges and the solvent composition. Chromatographic experiments in n-hexane showed that dipole and hydrophobic interactions affect the retention of solutes. Permeation of the solute across the NAM in water-ethanol mixture is likely to be determined by various factors such as dipole interaction, hydrophobic interaction, solvation, and anion-exchange efficiencies.

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