Structure Change of Chemically Adsorbed Monolayer Having Many Kinds of Alkyl Chain Lengths

FTIR spectra, the static contact angles, the sliding angles, and the ellipsometric thicknesses were measured on some monolayers prepared from n-alkyltrichlorosilane by a chemical adsorption (CA) technique. The molecular arrangement in the monolayer formed by the CA technique, CA monolayer, was found...

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Bibliographic Details
Published in:Journal of dispersion science and technology 2011-03, Vol.32 (3), p.407-414
Main Authors: Ohtake, Tadashi, Ogawa, Kazufumi
Format: Article
Language:English
Subjects:
Camber
Carbon
Chemical adsorption
chlorosilane
contact angle
Dispersions
Ellipsometry
FTIR
monolayer
Monolayers
SAM
self-assembly
sliding angle
Spectra
Stands
Surface chemistry
surfactant
Tilt
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Summary:FTIR spectra, the static contact angles, the sliding angles, and the ellipsometric thicknesses were measured on some monolayers prepared from n-alkyltrichlorosilane by a chemical adsorption (CA) technique. The molecular arrangement in the monolayer formed by the CA technique, CA monolayer, was found to be random or bulk-like when the carbon number of the alkyl group was 4 or 5, and the CA molecules were arranged along the substrate surface when the carbon number became 3, 8, and over. The arranged CA molecules were found to stand with the tilt angle of about 28° from the normal of the substrate surface when the carbon number was 8, and the tilt angle became smaller as the carbon number was above 8. It was proved that the CA molecules stood with the tilt angle of about 20 degrees when the carbon number was 20. These tilt angles were obtained by the ellipsometric thickness of the CA monolayer and the molecular length of the all trans-zigzag CA molecular model calculated by AM1.
ISSN:0193-2691
1532-2351
DOI:10.1080/01932691003662423