Silica nanoparticle formation in the TPAOH-TEOS-H2O system: A population balance model

Article Abstract:

A population balance model describing the kinetics of silica nanoparticle formation in the TPAOH-TEOS-H2O system is shown. The model reveals that nanoparticle evolution exhibits distinct time regimes consisting of TEOS hydrolysis, condensation, Ostwald ripening, and a self-sharpening mechanism in particle size distribution toward equilibrium due to stabilization during which no real changes in average particle size and pH are observed.

Analysis, Hydrolysis, Nanoparticles

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Photocatalytic oxidation of 2- Chloroethyl ethyl sulfide on TiO(sub 2)-SiO(sub 2) powders

Article Abstract:

Transmission infrared spectroscopy is used to characterize the surface species formed during the photooxidation of 2-CEES and DES to understand the factors that influence the photooxidation of mustard gas. The 2-CEES mole is hydrogen bonded to the Si-OH groups by both the Cl and the S moieties, and the photooxidation leads to loss of the spectral features caused by hydrogen bonding as the 2-CEES molecule is destroyed.

All Other Basic Organic Chemical Manufacturing, Industrial Organic Chemicals, Vinyl Chloride Monomer, Surface chemistry, Vinyl chloride

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Bifunctional hydrogen bonding of 2-Chloroethyl ethyl sulfide on TiO(sub 2)-SiO(sub 2) powders

Article Abstract:

The adsorption of 2-chloroethyl ethyl sulfide on a high area TiO2-SiO2 mixed oxide power is studied by using transmission infrared spectroscopy. Results show that the 2-chloroethyl ethyl sulfide was adsorbed on the surface of TiO2-SiO2 mixed oxide through both Cl and the S moieties, where each of the Cl and the S atoms is bonded to a single isolated Si-OH group via hydrogen bonding.

Observations, Oxides, Thermal properties, Adsorption

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