Premium
Reactivity of alkoxysilyl compounds: chemical surface modification of nano‐porous alumina membrane using alkoxysilylazobenzenes
Author(s) -
Kakiage Kenji,
Yamamura Masaki,
Ido Erika,
Kyomen Toru,
Unno Masafumi,
Hanaya Minoru
Publication year - 2011
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.1722
Subject(s) - azobenzene , chemistry , adsorption , surface modification , reactivity (psychology) , chemical modification , chemical engineering , oxide , porosity , membrane , solvent , polymer chemistry , chemical reaction , condensation reaction , condensation , organic chemistry , molecule , catalysis , biochemistry , alternative medicine , pathology , engineering , physics , thermodynamics , medicine
In order to clarify the chemical adsorption properties of alkoxysilyl compounds to metal‐oxide surface quantitatively and to obtain the information on the reaction conditions for the efficient surface modification, the chemical surface modifications of nano‐porous alumina membranes (NPAMs) by typical alkoxysilyl compounds of 4‐(triethoxysilyl)azobenzene, 4‐(diethoxyphenylsilyl)azobenzene, 4‐(ethoxydiphenylsilyl)azobenzene and 4‐(methoxydimethylsilyl)azobenzene were examined. The chemical surface modifications were performed by immersing NPAMs into the solutions of the alkoxysilylazobenzenes. Especially for 4‐(triethoxysilyl)azobenzene, the modification was investigated precisely by changing the solvent, temperature, concentration and water content of the solutions to reveal the effects of the reaction conditions on the adsorption property of alkoxysilyl compounds to metal oxides. The NPAMs having chemically modified surface were prepared successfully by the immersing method, and the alkoxysilylazobenzenes were confirmed to be bound on the NPAM surface through SiOAl bonds, which were indicated to be formed mainly by the direct condensation reaction between the alkoxysilyl groups of the azobenzenes and the hydroxy groups on the NPAM surface. The amounts of the azobenzenes adsorbed on the NPAM surface were estimated quantitatively by a visible absorption spectroscopy, and the results showed that the solutions with non‐polar solvents, higher temperatures and higher concentrations are suitable for the efficient surface modification. Copyright © 2010 John Wiley & Sons, Ltd.