Thermal stability of ocatadecylsilane monolayers on silica: Curvature and free volume effects

Article Abstract:

Vibrational spectroscopy and calorimetry are used to examine the thermal stability and dynamic behavior at elevated temperature of octadecyltrichlorosilane (OTS) self-assembled monolayers (SAMs) on fumed silicas, Aerosil 380 (A380) and Aerosil OX50 (OX50), and nonporous silica beads of 106 nm sizes. A well-ordered SAMs formed by OTS adsorption on superhydrated silica depicted increased thermal disordering of the alkyl chains with increasing surface curvature and increased free volume.

Silanes, Monomolecular films, Silane

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Transport of pure components in pervaporation through a microporous silica membrane

Article Abstract:

The pervaporation mechanism of pure components through a commercial microporous silica membrane was studied by performing experiments using water, methanol, ethanol, 2-propanol in the 40-80 degree Celsius temperature range. It can be stated that the transport mechanism follows the absorption-diffusion model comprising of configurational diffusion and surface diffusion.

Methanol, Analysis, Diffusion processes

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A novel route toward the synthesis of high-quality large-pore periodic mesoporous organosilicas

Article Abstract:

A novel route to the synthesis of high-quality, large-pore periodic mesoporous organosilicas (PMOs) using triblock copolymer P123 as a template is reported. The comparison and the interpretation of the role of the acid in the synthesis of high-quality PMOs and periodic mesoporous silicas (PMSs) are critically examined.

Organosilicon Compounds, Chemical synthesis, Properties

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