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Báo cáo hóa học: " A Facile Strategy for In Situ Core-Template-Functionalizing Siliceous Hollow Nanospheres for Guest Species Entrapment"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A Facile Strategy for In Situ Core-Template-Functionalizing Siliceous Hollow Nanospheres for Guest Species Entrapment | Nanoscale Res Lett 2009 4 1171-1177 DOI 10.1007 S11671-009-9378-7 NANO EXPRESS A Facile Strategy for In Situ Core-Template-Functionalizing Siliceous Hollow Nanospheres for Guest Species Entrapment Jun Wang Xin Gao Xianyan Yang Yilai Gan Wenjian Weng Zhongru Gou Received 9 February 2009 Accepted 15 June 2009 Published online 27 June 2009 to the authors 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. J. Wang X. Gao X. Yang Y. Gan Z. Gou H Zhejiang California International NanoSystems Institute Zhejiang University Huajiachi Campus 310029 Hangzhou China e-mail zhrgou@zju.edu.cn W. Weng Department of Materials Science and Engineering Zhejiang University Yuquan Campus 310027 Hangzhou China Keywords Self-template In situ .