NDLI: The phase behaviors of cationic and anionic aqueous mixtures and the usage as templates for synthesis of mesoporous materials

Content Provider	Springer Nature Link
Author	Teng, Hong ni Shen, Teng Hou, Yi xiao Chen, Yong Kou, Xiao yan Wang, Xiu yun
Copyright Year	2016
Abstract	Liquid crystals formed in aqueous mixtures of cationic and anionic surfactants were used as structure- directing templates for preparation of mesoporous silicas. For this purpose, micellar particle sizes and liquid crystal regions in the mixed system containing cetyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) were investigated by Melvin laser particle size analyzer and polarizers, respectively. The formation of large organized assemblies was closely related to both the total surfactant concentrations and mixing ratios. Micelles formed at low total concentration while liquid crystals formed at high total concentration. The mixtures of CTAB and SDS favored the formations of large organized assemblies when the molar fraction of CTAB was 0.30 or 0.70. Using tetraethoxysilane as precursor and liquid crystals as templates, mesoporous silicas were prepared at different total concentrations of surfactants when molar fraction of CTAB was fixed at 0.70. Transmission electron microscopy results revealed that ordered mesoporous silicas with lamellar pore channels were prepared. Nitrogen adsorption-desorption determinations showed that these materials exhibited a pore size about 4.5 nm. In addition, the surface areas increased significantly with the increase of total surfactant concentrations. This work provided a simple and effective approach to synthesize lamellar mesoporous silicas.
Starting Page	554
Ending Page	560
Page Count	7
File Format	PDF
ISSN	10876596
Journal	Glass Physics and Chemistry
Volume Number	42
Issue Number	6
e-ISSN	1608313X
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-12-02
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	cationic and anionic surfactants liquid crystal lamellar mesoporous silica Ceramics, Glass, Composites, Natural Materials Characterization and Evaluation of Materials Materials Science Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Condensed Matter Physics

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