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Flotation de-silicating from diasporic-bauxite with cetyl trimethylammonium bromide

Journal of Central South University of Technology 2003年第4期10卷 324-328页

作者：王毓华胡岳华刘晓文 School of Resources Processing and Bioengineering

Using cetyl trimethylammonium bromide （CTAB） as collector, the flotation de-silicating from diasporic-bauxite was investigated. And the Zeta potentials and contact-angles of silicate minerals and diaspore were also stu-（died.）The results show that in the presence of 2×10-4 mol·L-1CTAB, the surface charges of pyrophyllite, kaolinite and illite become more positive, and the contact angles of these three silicates also increase evidently in the pH range of 2-8, but the Zeta potentials and contact angles of diaspore change little. So, the floatability of the four minerals is in the following order: pyrophyllite>kaolinite≈illite>diaspore. The open-circuit flotation results also show that a bauxite concentrate with m（Al2O3）/m（SiO2） over 9.3 and Al2O3 recovery over 76% can be obtained from diasporic-bauxite ore. The result of XRD of the bauxite concentrate shows that pyrophyllite is easier to be removed from diasporic-bauxite than illite and kaolinite due to its better floatability.

关键词： aluminum-silicate bauxite reverse flotation cetyl trimethylammonium bromide

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Self-aggregation of surfactants in water solution by NMR

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Science China Mathematics 1999年第3期42卷 319-324页

作者：袁汉珍杜有如赵濉俞稼镛 State Key Laboratory of Magnetic Resonance Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan China Institute of Photochemistry Chinese Academy of Sciences Beijing China

Dynamic behavior of surfactant molecules, sodium dodecyl sulfonate (SDSN), cetyl trimethyl ammonium bromide (CTAB) and triton X-100, and their micelles in water solution at various concentrations were studied by chemical shift, self diffusion coefficient (D) and nuclear magnetic resonance relaxation (T1 and T2) measurements. Experimental results show that there exist turning points at surfactant concentration (C) nearby the critical micelle concentration (cmc) for all of the above-mentioned parameters, which approach the constant values when C equals 5 to 10 times cmc. T1 and T2 measurements show that when C

关键词： self-diffusion coefficient NMR relaxation molecular motion of surfactants critical micelle concentration sodium dodecylsulfonate cetyl trimethyl ammonium bromide Triton X-100.

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Formation of Lamellar Mesostructured Crystalline Silica by Self-assembly of CTAB

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Chemical Research in Chinese Universities 2019年第3期35卷 359-362页

作者： CUI Kai FANG Yuxi XU Dongdong ZHANG Yunjuan HAN Lu CHE Shunai State Key Laboratory of Metal Matrix Composites School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240P. R. China School of Chemical Science and Engineenng Tongji UniversityShanghai 200092P. R. China Jiangsu Key Laboratory of Biofunctional Materials School of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023P.R.China

Controlling organic-inorganic liquid crystal structures to form lamellar mesostructured crystalline silica nanosheets(LCS) was achieved by using the simple cationic surfactant cetyl trimethyl ammonium bromide(CTAB). The organic-inorganic interaction under the condtions of a high surfactant concentration and suitable synthesis temperature played an important role in the construction of mesostructured crystalline silica.

关键词： Lamellar mesostructure Crystalline silica Self-assembly cetyl trimethyl ammonium bromide Liquid crystal

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THE ELECTRONIC SPECTRA OF HYPOCRELLINS A, B AND THEIR DERIVATIVES

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Chinese Science Bulletin 1989年第3期34卷 258-258页

作者：第五振军蒋丽金张曼华 Institute of Photographic Chemistry Academia Sinica Beijing

Hypocrellins A and B are new phototherapeutic drugs developed in China. At present, the electronic spectra of hypocretlins A, B and their derivatives have not been studied systematically. Their absorption and fluorescence spectra were studied in detail. It was proved that their three visible absorption bands come respectively from the Ⅱ Ⅱ~* transition of their conjugated systems and intramolecular proton trans-

关键词： conjugated systematically intramolecular bands proton visible methacrylate dilute cetyl aromatic

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