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Materials 2012, 5(10), 1787-1799; doi:10.3390/ma5101787

Polyamine-Promoted Growth of One-Dimensional Nanostructure-Based Silica and Its Feature in Catalyst Design

1
Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China
2
Synthetic Chemistry Lab., Kawamura Institute of Chemical Research, 631 Sakado, Sakura 285-0078, Japan
3
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 / Revised: 23 September 2012 / Accepted: 24 September 2012 / Published: 1 October 2012
(This article belongs to the Special Issue Advances in Bio-inspired Materials)
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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 biomimetic silicification; polyethyleneimine; crystalline aggregates; nanostructured silica; silica nanotube; silica nanowire
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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.

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