Hybrid Mesoporous Silicas and Microporous POSS-Based Frameworks Incorporating Evaporation-Induced Self-AssemblyReportar como inadecuado


Hybrid Mesoporous Silicas and Microporous POSS-Based Frameworks Incorporating Evaporation-Induced Self-Assembly


Hybrid Mesoporous Silicas and Microporous POSS-Based Frameworks Incorporating Evaporation-Induced Self-Assembly - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Department of Materials and Optoelectronic Science, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan



These authors contributed equally to this work.





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Academic Editors: Jordi Sort and Eva Pellicer

Abstract We fabricated a series of mesoporous silicas and mesoporous organosilicates with hierarchical porosity through evaporation-induced self-assembly using Pluronic F127 as a template in this study. We could tailor the mesophase of each mesoporous silica sample by varying the weight ratio of its two silica sources: tetraethyl orthosilicate TEOS and triethoxysilane hydrosilylated octavinyl polyhedral oligomeric silsesquioxane OV-POSS-SILY. The mesophases ranged from an ordered body-centered cubic bcc structure TEOS alone to ordered face-centered cubic fcc structure 10 and 20 wt.% of OV-POSS-SILY and finally to disordered spherical pores ≥30 wt.% of OV-POSS-SILY. We used small-angle X-ray scattering SAXS and transmission electron microscopy TEM to study the transformations of these mesophases, while N2 isotherm sorption curves revealed the porosities of these mesoporous silicate samples. Moreover, 29Si CP-MAS solid state nuclear magnetic resonance spectroscopy allowed us to analyze the compositions of the POSS-containing silicate frameworks. Such functional mesoporous silica samples incorporating microporous POSS building units have potential applications in various systems, including optical and electronic devices. View Full-Text

Keywords: mesoporous; polyhedral oligomeric silsesquioxane POSS; evaporation-induced self-assembly mesoporous; polyhedral oligomeric silsesquioxane POSS; evaporation-induced self-assembly





Autor: Jheng-Guang Li †, Wei-Cheng Chu † and Shiao-Wei Kuo *

Fuente: http://mdpi.com/



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