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Biomimetic co-assembly of Gibbsite and mesophases: A novel synthesis route by devitrification of gel derived from hydrothermal aluminosilicate/CTAB solution

Published online by Cambridge University Press:  01 January 2024

Yauh-Yarng Fahn ,
Pouyan Shen  and
An-Chung Su
Yauh-Yarng Fahn
Affiliation:
Department of Chemical Engineering, Tung-Fang Institute of Technology, Eastern College of Technology and Commerce, Hu-Nei, Kaohsiung 829, Taiwan
Pouyan Shen*
Affiliation:
Institute of Materials Science and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan
An-Chung Su
Affiliation:
Institute of Materials Science and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan
*
*E-mail address of corresponding author: pshen@mail.nsysu.edu.tw
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Abstract

The effect of an amphiphilic surfactanton the co-assembly of gibbsite and low-dimensional-order, liquid-crystalline mesophases using a hydrothermal-gelafion-devitrification route was examined. Crystal growth by this method occurred either in three dimensions or was limited to only two dimensions. Gibbsite and mesophases were synthesized using a cationic surfactant, cetyltrimethyl ammonium bromide (CTAB), as template and a commercial mineral sample as inorganic precursor. The commercial mineral sample contained pyrophyllite, α-quartz, and minor kaolinite. The syntheses were made at pH 10 under hydrothermal conditions followed by equilibration at room temperature. The hydrothermally soluble portion settled at room temperature to form a translucent hydrous gel. This translucent gel turned white after drying on a glass substrate because of the following events based on chemical analysis, X-ray diffraction, and optical/electron microscopy: (1) gibbsite preferentially nucleated at the gel/air and gel/glass interfaces to form spherulites of tabular gibbsite crystals with entrapped droplets; (2) a ∼26 Å basal-spacing, aluminate-encased, lamellar mesophase formed by 2D growth near the edge of the drying gel; and (3) residual solution in entrapped droplets within the gibbsite phase later devitrified abruptly into an optically isotropic material (an aluminosilicate gel possibly with minor mesophases) with a dendritic morphology. Formation of gibbsite and the lamellar mesophase was initially interface controlled, but later became 2D diffusion-controlled as CTAB concentrations and micelle lengths were increased with crystallization time. A relatively high surfactant/water ratio of the drying gel might account for predominant crystallization of an aluminate-encased lamellar mesophase rather than the hexagonal mesophase known as the Mobil Composition Material MCM-41.

Keywords

Biomimetic Co-assemblyGel DevitrificationGibbsiteAluminosilicate and CTAB SolutionMesophasePolarized Optical MicroscopyTransmission Electron Microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 4 , August 2004 , pp. 451 - 461
Copyright
Copyright © The Clay Minerals Society 2004

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