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Particle Size Distribution and Characterization of High Siliceous and Microporous Materials

S.K.Durrani , J.Akhtar , M.Ahmad , M.J.Moughal

材料科学技术(英)

Particle size, textural and surface characteristics influence some major technological properties of high siliceous aluminosilicate zeolite and sillicoaluminophosphate (SAPO) microporous materials. A comparative study was furnished for measuring surface characteristics, particle size and particle size distribution using particle size analyzer (PSA) and scanning electron microscope (SEM). The PSA is capable of measuring particle diameter in micron range. The results of these techniques for estimation of particle size were compared and correlated statistically. Student t-test and variance ratio test (F-test) methods were performed for the significance of results by the analysis of variance (ANONA) and multiple-range tests. Textural and surface characteristics were evaluated by Brunauer, Emmett & Teller (BET) volumetric technique and v-αs plotting method. The textural results shows that the external surface area and micropore volume of microporous materials were higher than those of the high siliceous zeolites and its zeotype materials.

关键词: Synthesis , null , null , null

Synthesis and Characterization of Some Substituted Arylimidazole Derivatives

Zhiqiang ZHANG , Ren HE , Peng LEI , Yan GAO , Haijun CHI , Zhizhi HU

材料科学技术(英)

The incorporation of the imidazole nucleus is an important strategy in pharmaceuticals, chemiluminescence and electroluminescence. A facile synthesis of some aryl substituted imidazole derivatives from substituted benzils and substituted benzaldehydes via Debus reaction is described. Their structures were identified by IR, MS, NMR and their characteristics were evaluated by UV-visible and fluorescence spectroscopy.

关键词: Synthesis , null , null

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