Thermal properties of tetraalkoxysilanes

Abstract

Tetraalkoxysilanes were prepared by reacting SiCl4 with alcohols in the liquid phase in the presence of pyridine. Based on the experimental evidence and theoretical calculations, tentative structures have been proposed. Thermal conductivity measurements for these samples were done over a temperature range 303–463 K and the data are compared with the theoretical values derived from empirical equations. In addition, other properties such as specific heat (Cp), thermal expansion (α) and oxidation stability were determined and the values are compared with the reported values for polymethy Isiloxanes.

Microbial Transformations at Aqueous-Solid Phase Interfaces: A Bioremediation Approach

“…Available literature on TBOS and TKEBS mainly focuses on their thermal properties [24]. Specific research work related to the transformation of these compounds under environmental conditions is limited, and biological degradation of these compounds has not been investigated [423].…”

“…The controlled, practical use of microorganisms for the destruction, biodegradation, and biotransformation of organic contaminants at aqueous-solid phase environments has recently become widely used [8,20,22,24,71,146,147,193,301]. These various technologies rely on the biodegradation capability of microorganisms, and focus mainly on enhancing slow biodegradation processes in nature and/or engineering technologies which bring organic compounds into contact with microorganisms in some types of reactors allowing their rapid transformation [187,202].…”

“…4 Si], contain four oxygen bridges from the central silicon atom to the corresponding organic (alkoxy) groups. These compounds are widely used as heat-exchange fluids, sealants, and lubricants because of their excellent thermal properties [24,[421][422][423]. At Lawrence Livermore National Laboratory site 300, these compounds along with trichloroethylene (TCE) were used in heat-exchanger pipes at their materials testing facility [421][422][423].…”