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

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

1
, 2
, 1
 and 3,*
Received: 12 September 2012; in revised form: 23 September 2012 / Accepted: 24 September 2012 / Published: 1 October 2012
(This article belongs to the Special Issue Advances in Bio-inspired Materials)
Download PDF [530 KB, uploaded 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 biomimetic silicification; polyethyleneimine; crystalline aggregates; nanostructured silica; silica nanotube; silica nanowire
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

AMA 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(10):1787-1799.

Chicago/Turabian Style

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.


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