Mesoporous silica materials with an extremely high content of organic sulfonic groups and their comparable activities with that of concentrated sulfuric acid in catalytic esterification

Article Abstract:

Mesoporous silica materials (HS-JLU-20) with an extremely high content of mercaptopropyl groups are synthesized by using fluorocarbon-hydrocarbon surfactant mixtures through a simple cocondensation approach of tetraethyl orthosilicate (TEOS) and (3-mercaptopropyl)trimethoxysilane (MPTS), which are characterized by various methods. The HSO3-JLU-20 materials with an extremely high content of organic sulfonic groups, which are treated with hydrogen peroxide, have displayed comparable activity with liquid concentrated sulfuric acid in catalytic esterification of cyclohexanol with acetic acid.

X-rays, X-ray diffraction, Thermogravimetry, Condensation

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Vibrational analysis of H2 and D2 adsorption on Pt/SiO2

Article Abstract:

Vibrational properties of surface species formed upon H2 ad D2 exposure of silica supported platinum particles is investigated with in situ diffuse reflection infrared Fourier transform spectroscopy. The spectroscopy experiments show reversible formation of isolated OH and OD groups on the silica surface when the samples were exposed to H2 and D2, respectively.

Adsorption, Fourier transform spectroscopy

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Optical characterization of ultrasmall Si Nanoparticles prepared through electrochemical dispersion of bulk Si

Article Abstract:

Absorption and photoluminescence (PL) spectroscopy are used to characterize ultrasmall silicon nanopartilces (Si-np) prepared through anodic etching and ultrasound fractionation of a crystalline Si wafer. The result offers some potential for tailoring the PL properties of ultrasmall Si-np through control of their surface chemistry.

Optical properties, Photoluminescence, Atomic absorption spectroscopy

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