Influence of surface electrokinetics on organosilane adsorption

J. S. Quinton; P. C. Dastoor

doi:10.1002/(SICI)1096-9918(199908)28:1<12::AID-SIA611>3.0.CO;2-O

Influence of surface electrokinetics on organosilane adsorption

J. S. Quinton, P. C. Dastoor

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

The time-dependent adsorption of propyltrimethoxysilane (PTMS) in aqueous solution on four substrates (aluminum, zinc, iron and chromium oxide) has been investigated using x-ray photoelectron spectroscopy. Oscillations in the adsorption isotherm as a function of adsorption time in solution have been observed for all of the substrates studied. The adsorption of PTMS is shown to depend strongly upon the isoelectric point of the surface oxide. The closer the isoelectric point is to the solution pH, the more rapid is the initial adsorption rate of silane on the surface. Models are proposed to explain the influence that the electrokinetics of the surface has upon the adsorption mechanism.

Original language	English
Pages (from-to)	12-15
Number of pages	4
Journal	Surface and Interface Analysis
Volume	28
Issue number	1
DOIs	https://doi.org/10.1002/(SICI)1096-9918(199908)28:1<12::AID-SIA611>3.0.CO;2-O
Publication status	Published - Aug 1999
Externally published	Yes

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AB - The time-dependent adsorption of propyltrimethoxysilane (PTMS) in aqueous solution on four substrates (aluminum, zinc, iron and chromium oxide) has been investigated using x-ray photoelectron spectroscopy. Oscillations in the adsorption isotherm as a function of adsorption time in solution have been observed for all of the substrates studied. The adsorption of PTMS is shown to depend strongly upon the isoelectric point of the surface oxide. The closer the isoelectric point is to the solution pH, the more rapid is the initial adsorption rate of silane on the surface. Models are proposed to explain the influence that the electrokinetics of the surface has upon the adsorption mechanism.

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