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Influence of nano-MgO particle size on bactericidal action against Bacillus subtilis var. niger

Chinese Science Bulletin 2005年第6期50卷 514-519页

作者： HUANGLei LIDianqing LINYanjun DavidG.Evans DUANXue keylaboratoryofscienceandtechnologyofcontrollablechemicalreactions MinistryofEducationBeijingUniversityofChemicalTechnologyBeijing100029China

Nano-MgO with various particle sizes, synthe- sized by different methods using Mg(NO3)2·6H2O, Na2CO3, Na2SO4, urea and ammonia solution as reactants, was used to carry out bactericidal experiments on Bacillus subtilis var. niger. The results were compared with the effect of TiO2, a common kind of photocatalytic material. The materials were characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), low temperature N2 adsorp- tion-desorption measurements and FT-IR, and the results showed that the bactericidal ability of MgO increases with decreasing particle size. Nano-MgO and an interior wall-paint containing the material have better bactericidal effects than nono-TiO2 in both presence and absence of light. The bactericidal mechanism is discussed. The surface of MgO can generate high concentrations of O?2 which is highly active and can react with the peptide linkages in the coating walls of the spores. The spores are destroyed by the resulting damage to their structure.

关键词：氧化镁合成方法 “Bacillus subtilis var.niger” 杀菌活性细菌氧离子晶体

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Polymerization reaction in restricted space of layered double hydroxides(LDHs)

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Chinese Science Bulletin 2004年第23期49卷 2459-2463页

作者： SILichun CAIFuli WANGZhiqing DUANXue keylaboratoryofscienceandtechnologyofcontrollablechemicalreactions Box98MinistryofEducationBeijingUniversityofChemicalTechnologyBeijing100029China Depanmentofchemistry TsinghuaUniversityBeijing100084China

This paper reported the preparation of styrene sulfonate intercalated layered double hydroxides (LDHs) material, SS-LDHs by coprecipitation method, followed by in-situ polymerisation of the monomers in the interlayer space of LDHs. The polymerisation reaction was monitored by UV and NMR. It is confirmed that when the reaction oc- curred at 100℃ for 24 h, part of monomers did not react. When the reaction was carried out at 150℃, the polymeriza- tion of the intercalated monomers is complete to afford the polymer intercalated product PSS-LDHs. During the polym- erization process, the layered structure remains well. At the same time the gallery height increases with the lengthening of reaction time. This is preliminarily because that the PSS becomes more swelling with the amount of water it absorbs due to its hygroscopicity property.

关键词：聚合反应羟化物 LDHs 共沉淀方法钠苯乙烯磺酸盐

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