排序方式: 共有19条查询结果,搜索用时 15 毫秒
11.
以天然植物大蓟髓芯为大孔模板, 以嵌段共聚物为介孔软模板, 制备了孔径为60~100 μm、孔壁为介孔相的高度有序多级复合孔生物活性玻璃. 用扫描电子显微镜(SEM)、粉末X射线衍射仪(XRD)、高分辨率透射电镜(HRTEM)及N2吸附-脱附等测试手段对合成的样品进行了表征. 结果表明, 合成的材料精确地复制了植物模板的形貌, 同时具有较高的比表面积和较大的孔容. 通过体外模拟生理体液测试表明, 这种复合孔生物活性玻璃可诱导羟基磷灰石晶体在其表面形成, 具有良好的体外成骨性能, 因而在骨组织修复方面具有潜在应用前景. 相似文献
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Novel ZnO microbowls are successfully synthesized by thermal evaporating of a mixture of ZnS powder and Zn powder. The morphologies of the as-synthesized products can be adjusted by changing the temperature and the type of substrate. The morphologies, microstructures, and photoluminescence properties are investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscope, and photoluminescence spectroscopy respectively. The growth mechanism of the as-synthesized ZnO microbowls is proposed based on the experimental results. ZnO microbowls presented here can be used as building blocks to fabricate optical and optoelectronic micro/nano devices. 相似文献
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水溶性药物巯甲丙脯酸/Si-MCM-41载药新体系的制备与缓释作用研究 总被引:5,自引:0,他引:5
采用浸渍法将水溶性的抗高血压药物巯甲丙脯酸组装到Si-MCM-41的孔道中,药物组装量达33.99%[m(药物)/m(载体)];用XRD,IR和固体紫外法对药物组装体进行了表征;通过测定组装体在体外模拟人工胃液中的释放速率,表明制得了巯甲丙脯酸/Si-MCM-41缓释释放体系. 相似文献
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以巯甲丙脯酸为药物模型, 研究了不同孔道结构的介孔分子筛载体的药物释放性能. 相似文献
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This paper reports a novel helix-like ZnO nanostructure with several
tens of nanometres in thickness synthesized on a gold-coated Si
substrate by thermal evaporation of zinc sulfide powder at
1020°C. Transmission electron microscope characterization
shows that as-synthesized ZnO nanohelices extend along [01\bar 11]
direction and the axial direction of the helix is along [0001]
direction. A catalyst-intervened dislocation-induced growth
mechanism has been suggested to explain the formation of the
helix-like ZnO nanostructures. This study opens a new route to
construct helix-like ZnO nanostructures by different evaporation
sources. 相似文献
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本文设计并合成了一个具有共价有机骨架微孔结构的聚三(4-苯基)硅醇化合物。该化合物是利用乌尔曼反应,三(4-溴苯基)硅醇自聚合得到的。通过MAS NMR,FTIR,SEM,PXRD对化合物结构进行了表征。并通过TGA及氮气吸附表征化合物热稳定性及孔性质。该化合物具有高热稳定性(467 ℃失重5%),高化学稳定性,高BET比表面积(739 m2g-1)及很窄的孔径分布(1.27 nm)。 相似文献