Multilayered titania, silica, and Laponite nanoparticle coatings on polystyrene colloidal templates and resulting inorganic hollow spheres
Multilayered titania, silica, and Laponite nanoparticle coatings on polystyrene colloidal templates and resulting inorganic hollow spheres
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DOI：
10.1021/cm001175a
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发表时间：
2001-02-01
影响因子：
8.6
通讯作者：
Caruso, F
中科院分区：
文献类型：
--
作者：
Caruso, RA;Susha, A;Caruso, F
证明了层层（LbL）技术对于形成一系列聚合物核无机壳颗粒和无机空心球的适用性。二氧化钛、二氧化硅和合成锂皂石纳米颗粒被用作无机构件，用于在聚苯乙烯 (PS) 球模板上形成多层。通过将预制纳米颗粒与带相反电荷的聚电解质交替地受控组装到 PS 微球上，形成有机-无机复合颗粒。通过透射和扫描电子显微镜检查了纳米颗粒类型、形状（球形到片状）、尺寸（3-100 nm）以及 PS 球模板的直径（210-640 nm）对多层壳形成的影响。此外，用于涂覆聚合物球的 LbL 技术已被证明适用于优化不同材料的纳米粒子涂层的涂覆步骤的微小变化。例如，改变分隔纳米颗粒层的聚电解质多层的数量以及纳米颗粒/聚电解质沉积循环的数量以产生均匀涂覆的纳米复合材料球体。随后将这些混合核-壳颗粒进行煅烧，形成具有预定直径的轮廓分明的空心球。这种空心球可以应用于多种领域，从光子学到填料、颜料再到微胶囊化。
The applicability of the layer-by-layer (LbL) technique for the formation of a range of polymer-core inorganic-shell particles and inorganic hollow spheres is demonstrated. Titanium dioxide, silica, and Laponite nanoparticles were used as the inorganic building blocks for multilayer formation on polystyrene (PS) sphere templates. Composite organic-inorganic particles were formed by the controlled assembly of the preformed nanoparticles in alternation with oppositely charged polyelectrolytes onto PS microspheres. The influence of nanoparticle type, shape (spherical to sheetlike), and size (3-100 nm), and the diameter of the PS sphere templates (210-640 nm) on the formation of multilayer shells was examined by transmission and scanning electron microscopy. In addition, the LbL technique for coating polymer spheres has been shown to be adaptable with small variations in the coating steps used to optimize the nanoparticle coatings of the different materials. For example, the number of polyelectrolyte multilayers separating the nanoparticle layers, and the number of nanoparticle/polyelectrolyte deposition cycles were varied to generate uniformly coated nanocomposite spheres. These hybrid core-shell particles were subsequently calcined to create well-defined hollow spheres with predetermined diameters. Such hollow spheres may find application in diverse areas, ranging from photonics to fillers and pigments to microencapsulation.