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

作者：Quinton J S^*; Dastoor P C

来源：Surface and Interface Analysis, 2000, 30(1): 25-28.

• Propylmethoxysilane

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.

• 出版日期2000