Production of hollow microspheres from nanostructured composite particles
Production of hollow microspheres from nanostructured composite particles
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DOI：
10.1021/cm991083p
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发表时间：
1999-11-01
影响因子：
8.6
通讯作者：
Möhwald, H
中科院分区：
文献类型：
--
作者：
Caruso, F;Caruso, RA;Möhwald, H
通过用带相反电荷的纳米粒子和聚合物的交替层涂覆胶体核模板，然后通过加热或化学处理除去核，可以生产出均匀的无机和杂化无机-有机空心微球。通过将纳米颗粒和聚合物连续沉积到胶体模板上，利用颗粒和聚合物之间的静电引力来构建多层膜。中空二氧化硅球是通过煅烧聚合物乳胶球而获得的，该聚合物乳胶球涂有多层二氧化硅纳米颗粒（SiO2），并由聚合物[聚（二烯丙基二甲基氯化铵）（PDADMAC）]桥接。将 SiO2/PDADMAC 多层涂层聚合物乳胶胶体暴露于酸性溶液、二甲基亚砜或四氢呋喃中，产生空心复合二氧化硅-聚合物球。使用扫描和透射电子显微镜对制造的空心球进行了表征。所采用的方法非常适合生成直径、壁厚和成分受控的空心球。
Uniform inorganic and hybrid inorganic-organic hollow microspheres have been produced by coating colloidal core templates with alternating layers of oppositely charged nanoparticles and polymer, and thereafter removing the core either by heating or chemical treatment. The multilayers were constructed by consecutively depositing the nanoparticles and polymer onto the colloidal templates, utilizing the electrostatic attraction between the particles and polymer for layer build-up. Hollow silica spheres were obtained by calcining polymer latex spheres coated with multilayers of silica nanoparticles (SiO2) bridged by polymer [poly-(diallyldimethylammonium chloride) (PDADMAC)]. Exposure of SiO2/PDADMAC multilayer-coated polymer latex colloids to acidic solutions, dimethyl sulfoxide, or tetrahydrofuran yielded hollow composite silica-polymer spheres. The fabricated hollow spheres have been characterized using scanning and transmission electron microscopy. The approach employed is well suited to generating hollow spheres of controlled diameter, wall thickness, and composition.