Monitoring temporal evolution of silicate species during hydrolysis and condensation of silicates using mass spectrometry.

Formation of Silicate Grains in Circumstellar Environments: Experiment, Theory and Observations

SiO is one of the most abundant reacting oxygen bearing condensable gas-phase species in molecular astronomical regions. Based on laboratory smoke condensation experiments and analysis of end products, it was conjectured that silicate formation in the circumstellar envelopes surrounding M-type giants begins with the formation of pure SiOx clusters. There are no direct and almost no experimental...

Dynamics of silicate species in solution studied by mass spectrometry with isotopically labeled compounds.

Optical Viscometry of Spinning Sol Coatings

Optical interferometric monitoring of spin coating (optospinography) has allowed close observation of the temporal evolution of a thin silicate sol film (typically at 2000 rpm, 100 Hz data acquisition). The kinematic viscosity data obtained, using a simple analytical model, are validated with those from a mineral oil standard, with agreement well within the experimental uncertainties. For spin ...

Dynamics of PEO־PPO־PEO block copolymer aggregation and silicate mesophase formation monitored by time־resolved ATR־FTIR spectroscopy

The use of the attenuated total reflectance (ATR) technique to perform time-resolved FTIR spectroscopy analysis of the synthesis of SBA-15 silicate is reported. This spectroscopy is a powerful technique to investigate the assembly of surfactants and silicate species as well as surfactant micellization, as infrared bands are sensitive to local polarity and conformation of the surfactant chains. ...

Mesoporous ferrosilicates with high content of isolated iron species synthesized in mild buffer solution and their catalytic application

The mesoporous ferrosilicates with high content of framework iron species have been synthesized under mild acidic conditions (pH 4.4, buffer solution) by co-condensation of iron acetylacetonate and a mixture of tetraethoxysilane (TEOS) and sodium silicate using block copolymer Pluronic P123 as the template. The XRD, N2 sorption and TEM results show that the materials have well-ordered, two-dime...