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Polyamine-Promoted Growth of One-Dimensional Nanostructure-Based Silica and Its Feature in Catalyst Design
Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
Synthetic Chemistry Lab., Kawamura Institute of Chemical Research, 631 Sakado, Sakura 285-0078, Japan
Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University and JST-CREST, 3-2-7 Rokkakubashi, Yokohama 221-8686, Japan
* Author to whom correspondence should be addressed.
Received: 12 September 2012; in revised form: 23 September 2012 / Accepted: 24 September 2012 / Published: 1 October 2012
Abstract: Crystalline linear polyethyleneimine (LPEI) is a fascinating polymer that can be used as a catalyst, template and scaffold in order to direct the formation of silica with controllable compositions and spatial structures under mild conditions. Considering the crystallization and assembly of LPEI is temperature-dependent, we adopted different accelerated cooling processes of a hot aqueous solution of LPEI in order to modulate the LPEI crystalline aggregates. We then used them in the hydrolytic condensation of alkoxysilane. A series of silica with nanofibrils, nanotubes and nanowire-based structures were achieved simply by the LPEI aggregates which were pre-formed in defined cooling processes. These specific one-dimensional nanoscale structures assembled into microscale fibers-, sheet- and platelet-like coalescences. Furthermore, the deposition kinetics was also researched by the combination of other characterizations (e.g., pH measurement, 29Si MAS NMR). As a preliminary application, the hybrids of LPEI@SiO2 were used not only as an agent for reducing PtCl42− into Pt but also as host for loading Pt nanoparticles. The Pt-loaded silica showed good catalytic properties in the reduction of Rhodamine B by dimethylaminoborane (DMAB).
Keywords: biomimetic silicification; polyethyleneimine; crystalline aggregates; nanostructured silica; silica nanotube; silica nanowire
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MDPI and ACS Style
Liu, X.-L.; Zhu, P.-X.; Gao, Y.-F.; Jin, R.-H. Polyamine-Promoted Growth of One-Dimensional Nanostructure-Based Silica and Its Feature in Catalyst Design. Materials 2012, 5, 1787-1799.
Liu X-L, Zhu P-X, Gao Y-F, Jin R-H. Polyamine-Promoted Growth of One-Dimensional Nanostructure-Based Silica and Its Feature in Catalyst Design. Materials. 2012; 5(10):1787-1799.
Liu, Xin-Ling; Zhu, Pei-Xin; Gao, Yan-Feng; Jin, Ren-Hua. 2012. "Polyamine-Promoted Growth of One-Dimensional Nanostructure-Based Silica and Its Feature in Catalyst Design." Materials 5, no. 10: 1787-1799.