Measurement of infrared molar absorptivity of a surfactant adsorbed onto a solid substrate over a wide range of surface concentrations using octadecyltrichlorosilane Langmuir-Blodgett transferred films

Article Abstract:

The molar absorptivity of a surfactant species adsorbed on a solid substrate from their infrared spectra was determined. The measurement enabled the use of infrared methods in sizing up the surface coverage of a surfactant adsorbed at an interface. The molar absorptivity determined was for the -CH-asymmetric stretch of the methylene group with the adsorbate known as octadecyltrichlorosilane. The calibration employed the movement of a reference adsorbate monolayer as a known surface coverage from the air/water interface into a solid substrate using the Langmuir-Blodgett technique.

Absorption, Surface active agents, Thin films, Multilayered, Multilayered thin films

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Organofunctionalization of TiO2(110): (3,3,3-trifluoropropyl)trimethoxysilane adsorption

Article Abstract:

The interaction between (3,3,3-trifluoropropyl)trimethoxysilane (FPTS) or CF3CH2CH2Si(OCH3)3 and TiO2(110) was investigated using temperature-programmed desorption, X-ray photoelectron spectroscopy and static secondary ion spectrometry. Experimental results showed that FPTS dissociatively adsorbed on the TiO2(110) to form adsorbed CF3CH2CH2SiOCH3 and -OCH3 groups. The CF3CH2CH2SiOCH3 species was bound to the surface via two Si-O bonds.

Organic compounds, Hydrogen bonding, Hydrogen bonds

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Adsorption of CO on the TiO2(110) surface: a theoretical study

Article Abstract:

The adsorption of CO molecules on the rutile TiO2(110) surface was investigated using first-principles calculations based on density functional theory and the pseudopotential method. The calculations used slab geometry and periodic boundary conditions with total relaxation of all atomic positions. The accuracy of the theoretical method was verified by measurements on the bulk TiO2 crystal, bare surface and on the isolated CO molecule.

Carbon monoxide, Molecular rotation

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