Fabrication of non-close-packed colloidal monolayers by convective self-assembly using cationic polyelectrolyte-grafted silica particles
Fabrication of non-close-packed colloidal monolayers by convective self-assembly using cationic polyelectrolyte-grafted silica particles
复制标题
使用阳离子聚电解质接枝二氧化硅颗粒通过对流自组装制备非密堆积胶体单分子层
DOI：
10.1007/s00396-015-3706-5
复制
发表时间：
2015
影响因子：
2.4
通讯作者：
Keisuke Ohto
中科院分区：
文献类型：
--
作者：
Shintaro Morisada;Shoko Kojima;Takahiro Sumi;Hidetaka Kawakita;Keisuke Ohto
将聚（3-丙烯酰胺丙基）三甲基氯化铵（PAPTAC）和聚（乙烯基苄基三甲基氯化铵）（PVBTA）两种阳离子聚电解质分别接枝到SiO2粒子表面，并将其应用于以云母为基底的对流自组装（CSA）过程中制备胶体层。当使用PAPTAC接枝的二氧化硅颗粒（PAPTAC-Si）时，我们得到了由许多摆动珠组成的奇怪图案的胶体单分子膜。另一方面，通过使用PVBATA接枝的二氧化硅颗粒（PVBTA-Si）的CSA工艺，我们成功地制造了具有稍微恒定的颗粒间距离的胶体单层，即，不使用任何模板的非紧密堆积（NCP）结构。虽然这两种颗粒在其表面上具有阳离子聚电解质，但所得胶体单层的结构彼此相当不同，这表明接枝聚合物的分子结构对于通过CSA工艺图案化胶体层至关重要。
Two cationic polyelectrolytes, poly((3-acrylamidopropyl)trimethylammonium chloride) (PAPTAC) and poly(vinylbenzyl trimethylammonium chloride) (PVBTA), have been grafted on the surface of the silica particles, and then these polyelectrolyte-grafted silica particles have been applied to the convective self-assembly (CSA) process using mica substrate to prepare colloidal layers. When the PAPTAC-grafted silica particles (PAPTAC-Si) were used, we obtained the colloidal monolayers with a curious pattern composed of many wiggle beads. By the CSA process using the PVBATA-grafted silica particles (PVBTA-Si), on the other hand, we succeeded in fabricating the colloidal monolayers having a somewhat constant interparticle distance, that is, a non-close-packed (NCP) structure without using any templates. Although both particles have cationic polyelectrolytes on their surfaces, the structures of the resultant colloidal monolayers are quite different from each other, indicating that the molecular structure of the grafted polymer is crucially important for the patterning of the colloidal layers through the CSA process.