Two-Dimensional Assemblies of Colloidal SiO2 and TiO2 Particles Prepared by the Langmuir–Blodgett Technique
Two-Dimensional Assemblies of Colloidal SiO2 and TiO2 Particles Prepared by the Langmuir–Blodgett Technique
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Langmuir-Blodgett 技术制备的胶体 SiO2 和 TiO2 颗粒的二维组装体
DOI：
10.1006/jcis.2001.7784
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Koichi Kobayashi
中科院分区：
文献类型：
--
作者：
K. Muramatsu;Masashi Takahashi;K. Tajima;Koichi Kobayashi
采用LB技术将SiO2和TiO 2的胶体粒子在固体基底上进行二维组装。研究了产生均匀和致密颗粒堆积的最有利条件。从扫描电子显微镜和原子力显微镜的图像，它被发现，沉积的颗粒的数量是依赖于之间的静电相互作用的扩展单分子层和颗粒，这可以通过改变单分子层的表面电荷密度以及亚相的pH值控制。粒径分布对球形颗粒的排列有显著影响。当在大约中性pH下使用平均直径（d）为110 nm的单分散颗粒时，获得了SiO2颗粒的典型结果，其显示具有六方堆积排列的单颗粒层。另一方面，在pH 5.5-10.7范围内，在约100 ℃的XODA下制备了TiO 2（d=45 nm）纳米组装体，其显示具有薄颗粒层的高表面覆盖率。0.1.
The colloidal particles of SiO2 and TiO2 were arranged in a two-dimensional assembly on the solid substrate by using the Langmuir–Blodgett technique. The most favorable conditions for yielding uniform and dense packing of particles were examined. From scanning electron microscopy and atomic force microscopy images it was found that the quantity of deposited particles is dependent on the electrostatic interaction between the spreading monolayer and the particles, which could be controlled by changing the surface charge density of the monolayer as well as the pH of the subphase. The distribution of particle size markedly influenced the arrangement of spherical particles. The typical result for SiO2 particles, showing a monoparticle layer with a hexagonal packing arrangement, was obtained when the monodispersed particles with the mean diameter (d) of 110 nm were used at around neutral pH. On the other hand, the TiO2 (d=45 nm) nanoassembly, revealing the high surface coverage with thin particle layer, was prepared in the pH 5.5–10.7 range at XODA of ca. 0.1.