Ordered mesoporous silica nanoparticles with and without embedded iron oxide nanoparticles: structure evolution during synthesis
Ordered mesoporous silica nanoparticles with and without embedded iron oxide nanoparticles: structure evolution during synthesis
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DOI：
10.1039/c0jm01002b
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发表时间：
2010-01-01
影响因子：
--
通讯作者：
Wiesner, Ulrich
中科院分区：
文献类型：
--
作者：
Suteewong, Teeraporn;Sai, Hiroaki;Wiesner, Ulrich
这项工作报告了在室温下合成六方有序介孔二氧化硅纳米颗粒过程中的结构演变。利用阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)合成了油酸修饰的氧化铁纳米颗粒，并将其转移到水相中。采用溶胶-凝胶法制备了MCM-41型二氧化硅及其复合纳米颗粒。在合成过程中，从溶液中提取等分以捕捉颗粒形成过程。透射电子显微镜(TEM)和小角X射线散射(SAXS)表明两种合成体系都发生了从无序结构到有序结构的转变。随着结构的演变，早期作为种子的氧化铁纳米颗粒从颗粒中心向边缘移动。氮气吸附测量表明，介孔氧化铁纳米颗粒的比表面积与不含氧化铁的介孔二氧化硅纳米颗粒的比表面积相同。
This work reports on the structural evolution during room temperature synthesis of hexagonally ordered mesoporous silica nanoparticles with and without embedded iron oxide particles. Oleic acid-capped iron oxide nanoparticles are synthesized and transferred to an aqueous phase using the cationic surfactant, hexadecyltrimethylammonium bromide (CTAB). MCM-41 type silica and composite nanoparticles are fabricated via sol-gel synthesis. Aliquots are taken from the solution during synthesis to capture the particle formation process. Transmission Electron Microscopy (TEM) and Small Angle X-ray Scattering (SAXS) reveal a transition from a disordered to an ordered structure in both synthesis systems. Along with the evolution of structure, iron oxide nanoparticles acting as seeds at the early stages are relocated from the particle centers to the edges. Nitrogen sorption measurements for iron oxide-embedded mesoporous nanoparticles indicate surface areas as high as for the mesoporous silica nanoparticles without iron oxide.