The structure of TiO2-SiO2 sol-gel glasses from neutron diffraction of with isotopic substitution of titanium and 17O and 49Ti solid-state NMR with isotopic enrichment:

Article Abstract:

The structure of (TiO2)x(SiO2)1-x sol-gel glass as a function of composition (x=0.08, 0.18, and 0.41) and calcinations temperature (T=250, 500, and 750 degree) is characterized by using neutron diffraction with 46Ti and 48Ti stable isotopes and isotope-enriched 17O and 49 Ti MAS NMR. The presence of phase separation of TiO2 at all temperatures of heat treatment is exhibited by the (TiO2)0.41(SiO2)0.59.

Usage, Nuclear magnetic resonance, Chemistry, Physical and theoretical, Physical chemistry, Titanium compounds, Atomic properties

---

Second-order phase transitions in amorphous gallium clusters

Article Abstract:

Ion mobility and calorimetry measurements are used to study the nature of the phase transitions in gallium clusters with 29-55 atoms. It is observed that some clusters show the signature of melting without a significant latent heat, and that the transitions are the finite size analogue of a second-order phase transition, so it is concluded that they occur because their solidlike phase is amorphous.

Industrial inorganic chemicals, not elsewhere classified, Gallium Compounds, Analysis, Phase transformations (Statistical physics), Phase transitions (Physics), Amorphous substances, Amorphous materials, Chemical properties

---

Synthesis and temperature-dependence of hydrogen-terminated silicon clusters

Article Abstract:

A novel laser photolysis source is used to synthesis hydrogen-terminated silicon clusters Si(sub n)H(sub x)(super +) when n less than or equal to 50. The findings indicate that a shift in the hydrogen atom distribution occurs for Si(sub n)H(sub x)(super +) ions at intermediate temperatures.

Chemical synthesis

Similar abstracts:

• Abstracts: Absence of phase transitions in the hydrogen bond subsystem of associated fluids. Visual and spectroscopic demonstration of intercrystalline migration and resultant photochemical reactions of aromatic molecules adsorbed in zeolites
• Abstracts: Influence of dissolved gas on the interaction between hydrophobic surfaces in water. A model for studying drying at hydrophobic interfaces: structural and thermodynamic properties
• Abstracts: Density functional study of the roles of chemical composition of di-transition-metal-substituted gamma-Keggin polyoxometalate anions
• Abstracts: Interaction of hydrophobically modified cationic dextran hydrogels with biological surfactants. Interaction of sodium poly (2-acrylamide-2-methyl-1-propanesulfonate) linear polymer and gel with metal salts
• Abstracts: Influence of measurement conditions on electron diffusion in nanoporous TiO2 films: effects of bias light and dye adsorption

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.