Core-level shift of Si nanocrystals embedded in a SiO2 matrix

Article Abstract:

The introduction of Si into a SiO2 thin film enhances the charging effect greatly as compared to the system of a pure SiO2 thin film grown on a Si substrate. The charging effect has a strong influence on the Si 2p core levels causing the core levels of all oxidation states Si(super n+) in the material system to shift to a higher binding energy.

Silicon, Oxidation-reduction reactions

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Incorporation of transition-metal complexes in functionalized mesaporous silica and their activity toward the oxidation of aromatic amines

Article Abstract:

The highly ordered mesoporous material H(sub I)SiO(sub 2) is prepared at room temperature and low pH utilizing a high concentration of nonionic surfactant to achieve a hexagonal ordered phase with a pore size of 3.5 nm. The outer-sphere mechanism is probably followed in this redox system is indicated by the experimental results.

Oxidation reduction reactions, Amines

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Structure of the room-temperature ionic liquid/SiO2 interface studied by sum-frequency vibrational spectroscopy

Article Abstract:

The orientation of the imidazolium cation at the RTIL/SiO2 interface, as well as the structure of the interfacial water molecules using sum-frequency vibrational spectroscopy (SFVS) is determined. The alkyl chain of the imidazolium cation was determined to be nearly normal to the surface for all the RTILs examined.

Analysis, Vibrational spectra, Alkyl groups

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