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Potentiality of Reflectometry for the Study of the Adsorption on Dielectric and Metal Substrates: Application to the Adsorption of Polyvinylimidazole on Silica and Gold

✍ Scribed by T. Roques-Carmes; F. Membrey; C. Filiâtre; A. Foissy

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 240 KB
Volume: 245
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.2001.8007

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✦ Synopsis

Optical fixed-angle reflectometry was examined as a technique to study the adsorption of organics (polymers, surfactants) on metallic substrates. Calculations were made to evaluate the sensitivity of the method with regard to the refractive index and the thickness of the metal and the incidence angle. Theoretical results show that Ti, Cr, V, Zr, and gold have an appropriate sensitivity for detecting the adsorption accurately. Parallel experiments using gold and silica substrates and polyvinylimidazole (PVI) as an organic material were carried out. Adsorption measurements as a function of polymer concentration, pH, and ionic strength were in accordance with expected trends.

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