Sugikawa Kouta, Numata Munenori, Kaneko Kenji, Sada Kazuki, Shinkai Seiji
Graduate School of Engineering, Kyushu University, Japan.
Langmuir. 2008 Dec 2;24(23):13270-5. doi: 10.1021/la802211q.
A great deal of attention has been focused on exploiting novel methods to fabricate thin carbonaceous capsules from multiple components for advanced materials. A layer-by-layer (LbL) method is therefore being introduced to synthesize thin and multi-carbon nanotube (CNT)-based hollow capsules from CNT complexes with cationic or anionic complementarily functionalized beta-1,3-glucans as building-blocks. These ionic beta-1,3-glucans wrap around single-walled carbon nanotubes (SWNTs) and double-walled carbon nanotubes (DWNTs) to form water-soluble complexes with ionic groups on their exterior surface. Alternate self-assembly of these CNT complexes on the silica particles is demonstrated in solution by electrostatic interactions. The LbL adsorption processes were carefully monitored by zeta-potential measurements, frequency shifts of a quartz crystal microbalance (QCM), and electron micrographs. Silica particles were then dissolved away by HF acid to obtain CNT-based hollow capsules composed of SWNTs and DWNTs. We believe that these novel surface adsorption methods are useful for potential design of CNT-based advanced functional materials.
大量注意力集中在开发新方法以从多种成分制造用于先进材料的薄碳质胶囊。因此，正在引入一种逐层（LbL）方法，以由具有阳离子或阴离子互补功能化β-1,3-葡聚糖的碳纳米管（CNT）复合物作为构建块来合成基于碳纳米管的薄型中空胶囊。这些离子型β-1,3-葡聚糖包裹单壁碳纳米管（SWNTs）和双壁碳纳米管（DWNTs），在其外表面形成带有离子基团的水溶性复合物。通过静电相互作用在溶液中证明了这些CNT复合物在二氧化硅颗粒上的交替自组装。通过ζ电位测量、石英晶体微天平（QCM）的频率偏移和电子显微镜照片仔细监测LbL吸附过程。然后用氢氟酸溶解二氧化硅颗粒，以获得由SWNTs和DWNTs组成的基于碳纳米管的中空胶囊。我们相信这些新颖的表面吸附方法对于基于碳纳米管的先进功能材料的潜在设计是有用的。
