Self-Catalytic Sol-Gel Synergetic Replication of Uniform Silica Nanotubes Using an Amino Acid Amphiphile Dynamically Growing Fibers as Template
Self-Catalytic Sol-Gel Synergetic Replication of Uniform Silica Nanotubes Using an Amino Acid Amphiphile Dynamically Growing Fibers as Template
复制标题
以氨基酸两亲物动态生长纤维为模板自催化溶胶-凝胶协同复制均匀二氧化硅纳米管
DOI：
10.1021/la9033707
复制
发表时间：
2010-03-16
期刊：
影响因子：
3.9
通讯作者：
Huang, Jianbin
中科院分区：
文献类型：
--
作者：
Lei, Sheng;Zhang, Jing;Huang, Jianbin
研究了一种新型组氨酸衍生物表面活性剂N-十二酰-L-组氨酸（DHis）在水溶液中的聚集行为。通过与阳离子/阴离子表面活性剂混合，观察到随着时间的推移从透明的均匀溶液到凝胶，最后到纤维状絮状物的有趣的相变，在系统中发生聚集体生长。利用DHis/DTEAB和DHis/SDS体系中不断生长的纤维状结构作为表面电荷可调的动态模板，分别在温和条件下实现了SiO2和TiO 2纳米管的溶胶-凝胶复制。氧化硅纳米管的形成机制可能是沉积在模板表面的氧化硅前驱体的自催化水解和缩合协同作用。特别是通过优化溶胶-凝胶工艺，可以高产率地获得直径尺寸可调且壁厚均匀的二氧化硅纳米管。二氧化硅纳米材料的大比表面积和独特的光致发光性质表明，合成的纳米管具有良好的形貌和物理性质。重要的是，这种纤维状聚集体可以普遍用于相反电荷的无机前体，通过溶胶-凝胶复制过程来实现无机氧化物纳米管，这可能为在水介质中构建一维纳米结构提供一般路线。
The aggregation behavior of a novel histidine derivative surfactant N-dodecanoyl-L-histidine (DHis) in aqueous Solution was investigated. By mixing with cationic/anionic surfactant, an interesting phase transition over time from transparent homogeneous solution to jelly and finally to fibrous floocules was observed with aggregates growth taken place in the systems. Making use of the growing fibrous structures in the DHis/DTEAB and DHis/SDS systems as surface charge tunable dynamic template, we achieved sol-gel replication of silica and titania nanotubes in mild conditions, respectively. The possible mechanism underlying the formation of silica nanotubes was proved to be synergistically self-catalyzed hydrolysis and condensation of silica precusors depositing on the template surface. In particular, by optimizing the sol-gel process, silica nanotubes with tunable sizes in diameter and uniform wall thickness could be obtained in high yield. The large specific surface area and peculiar photoluminescence property of the silica nanomaterials indicated that the synthetic nanotubes were well-defined in both morphology and physical properties. Importantly, this Fibrous aggregates could be universally used in opposite charged inorganic precursors to accomplish inorganic oxide nanotubes via sol-gel replication process, which may provide a general route for the construction of one-dimensional nanostructures in aqueous media.