Study of the Chemical Adsorption Property of Allylsilylazobenzene in the Surface Modification of Nanoporous Alumina Membrane

Abstract

In order to clarify the chemical adsorption property of allylsilane to metal-oxide surface quantitatively and to obtain the information on the reaction conditions for the efficient surface modification, chemical surface modification of nanoporous alumina membranes (NPAMs) by a typical allylsilyl compound of 4-(allyldimethylsilyl) azobenzene was examined. The chemical surface modification was performed by immersing NPAMs into the solutions of the allylsilylazobenzene. The modification was investigated precisely by estimating the amount of the silylazobenzene adsorbed on the NPAM surface using a visible absorption spectroscopy with changing the temperature, solvent, and the concentration of the solution to reveal the effects of the reaction conditions on the adsorption property of the allylsilane to the metal-oxide surface. The solutions with higher temperatures, non-polar solvents, and higher concentrations were shown to be suitable for the efficient surface modification.