Improvement of hydrothermal stability of mesoporous silica using salts: reinvestigation for time-dependent effects

Article Abstract:

Research was conducted to reexamine the salt effect to solve the problem of poor reproducibility. The synthesis of mesoporous silica molecular sieves was obtained in the presence of salts under different experimental conditions. A hydrothermal stability test in boiling water, X-ray diffraction, infrared spectroscopy and scanning electron microscopy were used to analyze the hydrothermal stability and structure of the silica materials. It was found that the time dependence was a very important factor for the improvement of the hydrothermal stability.

Silica, Molecular sieves, Salts, Silicon dioxide

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Theoretical and experimental investigation of morphology and temperature effects on adsorption of organic vapors in single-walled carbon nanotubes

Article Abstract:

Hexane adsorption mechanism and capacity of organic molecules on single-walled carbon nanotube (SWNT) bundles are investigated by molecular simulation. Hexane is selected as a model organic adsorbate and to determine its adsorption on localized sites on SWNT bundles, a series of configurational-bias grand canonical Monte Carlo simulations are performed, whose results are directly compared with adsorption measurements at various temperature.

Usage, Nanotechnology, Monte Carlo method, Monte Carlo methods

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Anionic and upper-excited fluorescence of C(sub 60) encapsulated in Y zeolitic nanocavity

Article Abstract:

C(sub 60) inserted into a Y zeolitic nanocavity indicates anomalous upper-excited fluorescence as well as anionic and normal fluorescence. By measuring its ESR spectrum, the formation of (super .)C(sub 60)(super -) is identified, while the intercalation of C(sub 60) into the supercage of the zeolite is confirmed by measuring (super 129)Xe NMR spectra.

Spectra, Erythrocyte sedimentation rate

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