Open Access Nano Express

A Facile Strategy for In Situ Core-Template-Functionalizing Siliceous Hollow Nanospheres for Guest Species Entrapment

Jun Wang1, Xin Gao1, Xianyan Yang1, Yilai Gan1, Wenjian Weng2 and Zhongru Gou1*

Author Affiliations

1 Zhejiang California International NanoSystems Institute, Zhejiang University, Huajiachi Campus, 310029, Hangzhou, China

2 Department of Materials Science and Engineering, Zhejiang University, Yuquan Campus, 310027, Hangzhou, China

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Nanoscale Research Letters 2009, 4:1171-1177  doi:10.1007/s11671-009-9378-7

Published: 27 June 2009

Abstract

The shell wall-functionalized siliceous hollow nanospheres (SHNs) with functional molecules represent an important class of nanocarriers for a rich range of potential applications. Herein, a self-templated approach has been developed for the synthesis of in situ functionalized SHNs, in which the biocompatible long-chain polycarboxylates (i.e., polyacrylate, polyaspartate, gelatin) provide the framework for silica precursor deposition by simply controlling chain conformation with divalent metal ions (i.e., Ca2+, Sr2+), without the intervention of any external templates. Metal ions play crucial roles in the formation of organic vesicle templates by modulating the long chains of polymers and preventing them from separation by washing process. We also show that, by in situ functionalizing the shell wall of SHNs, it is capable of entrapping nearly an eightfold quantity of vitamin Bc in comparison to the bare bulk silica nanospheres. These results confirm the feasibility of guest species entrapment in the functionalized shell wall, and SHNs are effective carriers of guest (bio-)molecules potentially for a variety of biomedical applications. By rationally choosing the functional (self-templating) molecules, this concept may represent a general strategy for the production of functionalized silica hollow structures.

Keywords:
Self-template; In situ functionalizing shell wall; Guest molecule entrapment; Siliceous hollow nanospheres