检索结果-南通市图书馆

The effect of Temperature on Transformation of Kaolinite to Halloysite-like Nanoroll Via One-step Delamination

在线全文

学校读者我要写书评

暂无评论

矿物学报 2013年第S1期33卷 91-91页

作者： TAN Daoyong YUAN Peng Faza Annabi-Bergaya LIU Dong LIU Hongmei Guangzhou Institute of Geochemistry Chinese Academy of Sciences University of Chinese Academy of Sciences Centre de recherche sur la matière divisée CNRS-Université d'OrléansOrleansFrance

Tubular halloysite is a hydrated polymorph of kaolinite, commonly considered as its associated mineral. Due to its unique mesoscopic (2–50 nm) tubular structure, it has attracted great interest in the field of adsorption, catalysis, and nanocarrier. The halloysites in different deposits present various morphological properties which significantly affect the interface reactions with functional guests. These scattered properties in addition to their low purity severely limit the actual applications of halloysite in industry.

关键词： kaolinite halloysite-like nanoroll intercalation reaction temperature thermal stability

Natural Tubular Halloysite as Drug Carrier: effect of Organosilane Modification and Thermal Treatment

在线全文

学校读者我要写书评

暂无评论

矿物学报 2013年第S1期33卷 131-131页

作者： YUAN Peng TAN Daoyong Annabi-Bergaya Faza LIU Dong LIU Hongmei CAS Key laboratory of Mineralogy and Metallogeny Guangzhou Institute of GeochemistryChinese Academy of Sciences University of Chinese Academy of Sciences Centre de recherche sur la matière divisée CNRS-Université d'OrléansOrléans 45071France

Naturally occurring tubular halloysite is a potential drug carrier because of the significant deposit, unique mesoscopic (2-50 nm) or even macroscopic (>50 nm) lumen, and excellent biocompatibility. The drugs loaded on halloysite exhibited slow release under the diffusion limitation by the halloysite nanotube. However, due to the weak interaction between halloysite and guest, the loading capacity of halloysite was relatively low. This drawback severely limits the application of halloysite as carrier in pharmaceutics. In this study, the performance of halloysite as carrier for ibuprofen (IBU) loading was investigated for the first time. The effects of 3-aminopropyltriethoxysilane (APTeS) modification and thermal treatment of halloysite on the loading and release of IBU were also studied. The purified halloysites were heated at 120 ℃ and 400 ℃ (labeled as Hal/120 and Hal/400), and then modified with APTeS (labeled as Hal/120-A and Hal/400-A). The loading of IBU was achieved by soaking method (labeled as IBU-Hal/120, IBU-Hal/400, IBU-Hal/120-A, and IBU-Hal/400-A.). The in vitro drug delivery assays were performed in phosphate buffer solution. IBU was loaded mainly into the lumen and partially on the external surface of halloysite. The order of IBU contents was as follows: IBU-Hal/400-A (14.8wt%) > IBU-Hal/120-A (12.7wt%) > IBU-Hal/400 (11.8wt%) > IBU-Hal/120 (11.7wt%). The IBU was initially anchored to the surface hydroxyl groups of halloysite by hydrogen bonding, followed by further bonding of IBU with the anchored IBU to form hydrogen-bonded aggregates. The APTeS modification of halloysite promoted the loading of IBU by introducing a strong affinity through electrostatic attraction between the introduced aminopropyl groups of APTeS and the carboxyl groups of IBU. Thermal treatment at 400°C did not destroy the tubular morphology or the crystal structure of halloysite and had little effect on IBU loading in unmodified halloysite. However, thermal treatment by reducing

关键词： halloysite ibuprofen drug delivery organosilane modification thermal treatment

X-ray diffraction study of effect of deposition conditions on α-β phase transition and stress evolution in sputter-deposited W coatings

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2006年第2期15卷 432-436页

作者：王聪 Brault Pascal Pineau Alain Plantin Pascale Thomann Anne-Lise Groupie de recherches sur I'energétique des Milieux Ionisés UMR6606 -CNRS Ecole Polytechnique de I'Université d'Orléans BP6744 Université d'Orléans F-45067 Orléans Cedex 2 France School of Science Beijing University of Astronautics and Aeronautics Beijing 100083 China Centre de recherches sur la matière divisée - UMR 6619 CNRS - Université d'Orléans 1B rue de la Férollerie 45071 Orldans Cedex 2 France

Pure W and W-Cu-W trilayer coatings were deposited on an Fe substrate by d.c. magnetron sputtering. The α-β phase evolution, intragranular stress evolution in sputter-deposited W layer were investigated by x-ray diffraction. They are directly related to the film microstructure, density and adhesion. Therefore, control of the film stress and phase component transition is essential for its applications. The phase component transition from β-W to α-W and intragranular stress evolution from tensile to compressive strongly depend on the deposition parameters and can be induced by lowering Ar pressure and rising target power. The compressively stressed films with α-W phase have a dense microstructure and high adhesion to Fe substrate.

关键词： W coatings x-ray diffraction α-β phase component transition thin film stress

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

月光花素甲的糖组份的结构测定

有机化学 1989年第2期9卷 141-145页

作者：胡友川 R.Pastor G.Serratrice A.Cambon C.Bosso 厦门大学化学系 laboratoiredc Chimie Molèculaire Universitè de Nice France. laboratoired'etude des Solutions Organiques et Colloidales Universitè de Nancy France. laboratoirede Chimie Organique du Fluor Universitè de Nice France. centrede recherche sur la Macromolècules Vègètales Universitè de Grenoble France.

厦门大学植物激素研究组从月光花(Calonyction aculeatum L. House)叶中提取出一种活性物质,称为月光花素甲。它对植物具有明显的生理活性,并能促进作物生长,达到增产的效果。方一苇等通过质子核磁共振和电子轰击质谱分析,初步确定月光... 详细信息

厦门大学植物激素研究组从月光花(Calonyction aculeatum L. House)叶中提取出一种活性物质,称为月光花素甲。它对植物具有明显的生理活性,并能促进作物生长,达到增产的效果。方一苇等通过质子核磁共振和电子轰击质谱分析,初步确定月光花素甲是11-羟基一十六烷酸乙酯和6-去氧己醛糖组成的糖甙类物质。

关键词：月光花素甲糖苷结构

月光花素甲(Ⅰ)、(Ⅱ)整体分子结构的测定

在线全文

学校读者我要写书评

暂无评论

有机化学 1989年第2期9卷 146-150页

作者：胡友川郭奇珍 R.Pastor G.Serratrice A.Cambon C.Bosso 厦门大学化学系 laboratoirede Chimie Moléculaire Université de Nice France. laboratoired'etude des Solutions Organiques et Colloidales Université de Nancy France. laboratoirede Chimie Organique du Fluor Université de Nice France. centrede recherche sur la Macromolécules Végétales Université de Grenoble France.

本文对月光花素甲(Calonyctin A)的整体分子结构分析加以完善并进行总结。前文报道月光花素甲是两个分子量相差28a.m.u的糖甙类同系物分子的混合物。这两个分子(简称M_1和M_2)分别称为月光花素甲(Ⅰ)与月光花素甲(Ⅱ)(Calonyctm A_1,Cal... 详细信息

本文对月光花素甲(Calonyctin A)的整体分子结构分析加以完善并进行总结。前文报道月光花素甲是两个分子量相差28a.m.u的糖甙类同系物分子的混合物。这两个分子(简称M_1和M_2)分别称为月光花素甲(Ⅰ)与月光花素甲(Ⅱ)(Calonyctm A_1,CalonyctinA_2),分子量分别为938与910。

关键词：月光花素甲分子结构