Controlled evolution from multilamellar vesicles to hexagonal mesostructures through the addition of 1,3,5-trimethylbenzene

Lu, Tao, Yao, Xiangdong, Lu, Gao Qing, and He, Yinghe (2009) Controlled evolution from multilamellar vesicles to hexagonal mesostructures through the addition of 1,3,5-trimethylbenzene. Journal of Colloid and Interface Science, 336 (1). pp. 368-373.

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Self-assembled porous silica materials with adjustable structures and tunable pore sizes have important applications in catalysis, separation, and nanoscience. Organic cosolvents such as 1,3,5-trimethylbenzene (TMB) can be used to synthesize large pore mesoporous materials. In this study, we systematically studied the influence of the time of TMB addition on the self-assembled organic/inorganic composite structures in a nonionic block copolymer templating system. By controlling the time at which TMB is added to the system, an evolution from multilamellar vesicle to ordered hexagonal mesostructure has been observed. TMB is a swell agent in our synthesis, an increase in the delay of TMB addition can kinetically reduce the amount of TMB penetrating into the hydrophobic core of embryonic mesostructure, leading to cooperatively self-assembled vesicular and mesostructured materials with decreased packing parameters. Our results have shown that, in the simple synthesis system of traditional SBA-15 material, siliceous materials with a range of structures can be rationally designed and synthesized through the addition of TMB at different times. Such materials with tunable pore structures have potential applications as microcapsules and controlled release/delivery carriers.

Item ID: 11159
Item Type: Article (Research - C1)
ISSN: 1095-7103
Keywords: surfactant; liquid crystal; vesicle; nanomaterials; self-organization
Date Deposited: 24 May 2010 02:09
FoR Codes: 09 ENGINEERING > 0904 Chemical Engineering > 090499 Chemical Engineering not elsewhere classified @ 50%
09 ENGINEERING > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 100%
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