Sandwich Fe2O3@SiO2@PPy ellipsoidal spheres and four types of hollow capsules by hematite olivary particles
Sandwich Fe2O3@SiO2@PPy ellipsoidal spheres and four types of hollow capsules by hematite olivary particles
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DOI：
10.1039/b404734f
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发表时间：
2004-09
影响因子：
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通讯作者：
L. Hao;Chunling Zhu;Wanquan Jiang;Chunnian Chen;Yuan Hu;Zuyao Chen
中科院分区：
文献类型：
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作者：
L. Hao;Chunling Zhu;Wanquan Jiang;Chunnian Chen;Yuan Hu;Zuyao Chen
以赤铁矿(α-Fe_2O_3)橄榄石为原料，成功制备了赤铁矿@SiO_2@聚吡咯(Fe_2O_3@SiO_2@PPy)椭球夹心复合球以及SiO_2、SiO_2/PPy、PPy中空胶囊和可移动赤铁矿核心的PPy椭球中空胶囊。首次采用三氯化铁溶液水解法制备了单分散的α-Fe_2O_3橄榄石颗粒。然后，以聚N-乙烯基吡咯烷酮为锚定分子，以聚N-乙烯基吡咯烷酮为锚定分子，碱催化四乙基硅氧烷(TEOS)水解，合成了Fe2O_3@SiO_2核壳粒子。此外，在制备的Fe2O_3@SiO_2复合微球周围进行了吡咯单体的聚合反应，形成了夹心多层核壳粒子。扫描电子显微镜(SEM)和透射电子显微镜(TEM)图像表明，中间层二氧化硅外壳和外层聚吡咯鞘均匀地覆盖在赤铁矿核心上。另外，选择性去除夹心椭球的赤铁矿、Fe2O_3@SiO_2核或二氧化硅中间壳后，得到了SiO_2、SiO_2/PPy、PPy椭球中空胶囊和具有可移动赤铁矿核心的PPy椭球中空胶囊。
Hematite@silica@polypyrrole (Fe2O3@SiO2@PPy) ellipsoidal sandwich composite spheres as well as SiO2, SiO2/PPy, PPy hollow capsules and PPy ellipsoidal hollow capsules with movable hematite cores were successfully fabricated by hematite (α-Fe2O3) olivary particles. Monodispersed α-Fe2O3 olivary particles were firstly prepared via hydrolysis of ferric chloride solutions. Then Fe2O3@SiO2 core–shell particles were synthesized based on base-catalysed hydrolysis of TEOS (tetraethylsiloxane) using steric agent PVP [poly(N-vinylpyrrolidone)] as anchor-molecule. Furthermore, polymerization of pyrrole monomers was preformed around as-prepared Fe2O3@SiO2 composite spheres to form sandwich multilayer core–shell particles. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show that both the middle layer silica shell and the outer layer polypyrrole sheath are uniformly coated over the hematite cores. In addition, SiO2, SiO2/PPy, PPy ellipsoidal hollow capsules and PPy ellipsoidal hollow capsules with movable hematite cores were obtained after the selective removal of the hematite, Fe2O3@SiO2 cores or silica middle shell of the sandwich ellipsoids respectively.