title: Alternate layer-by-layer adsorption of single- and double-walled carbon nanotubes wrapped by functionalized beta-1,3-glucan polysaccharides.
abstract: 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.
authors.affiliation: Graduate School of Engineering, Kyushu University, Japan.
authors.forename: Kouta
authors.initials: K
authors.lastname: Sugikawa
authors.forename: Munenori
authors.initials: M
authors.lastname: Numata
authors.forename: Kenji
authors.initials: K
authors.lastname: Kaneko
authors.forename: Kazuki
authors.initials: K
authors.lastname: Sada
authors.forename: Seiji
authors.initials: S
authors.lastname: Shinkai
mesh_terms: D000327:Adsorption; D008567:Membranes, Artificial; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D011134:Polysaccharides / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D047071:beta-Glucans / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D037742:Nanotubes, Carbon; D011134:Polysaccharides; D047071:beta-Glucans; D012822:Silicon Dioxide