Modelling the observed oscillations in the adsorption kinetics of propyltrimethoxysilane on iron and aluminum oxide surfaces

J. S. Quinton, P. C. Dastoor

Research output: Contribution to journalConference article

20 Citations (Scopus)

Abstract

The growth kinetics of surface films of propyltrimethoxysilane (PTMS) deposited on aluminum and iron oxide surfaces exhibit oscillatory adsorption. This phenomenon involves non-linear oscillations in surface coverage of the adsorbate, as measured by x-ray photoelectron spectroscopy (XPS), as a function of exposure time and solution concentration. In this paper, a mathematical model is presented to describe the experimentally observed time-dependent behaviour. The oscillatory nature of the adsorption can be modelled by a superposition of adsorption and desorption processes. The model quantitatively describes the rate and non-linearity of these processes. Using this model, the influence of the substrate upon the various adsorption processes is described quantitatively. A model for the physical origins of the three processes is presented.

Original languageEnglish
Pages (from-to)25-28
Number of pages4
JournalSurface and Interface Analysis
Volume30
Issue number1
DOIs
Publication statusPublished - Aug 2000
Externally publishedYes
Event8th European Conference on Applications of Surface and Interface Analisys, ECASIA 99 - Sevilla, Spain
Duration: 4 Oct 19998 Oct 1999

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