Formation of mesoporous silicates using Triton XN surfactants in the presence of concentrated mineral acids

Khimyak, Yaroslav Z. and Klinowski, Jacek (2000) Formation of mesoporous silicates using Triton XN surfactants in the presence of concentrated mineral acids. Journal of Materials Chemistry, 10 (8). pp. 1847-1855. ISSN 0959-9428

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Abstract

Mesoporous silicates have been prepared from synthesis mixtures with different acid contents using Triton XN surfactants with short poly(ethylene oxide) (PEO) chains. At very high acid contents, even Triton X45 (n(EO) = 5.0) with a very low cloud point, gives mesoporous solids. Triton X114 (n(EO) = 8.0) and Triton X100 (n(EO) = 10.0) give high quality (HQ) products within a well-defined range of acid contents. HQ products give sharper XRD peaks and narrower pore size distributions than low quality (LQ) products. We attribute the formation of the HQ products to the altered organisation of the surfactant and the formation of hydrogen-bonded adducts with the PEO chains. The N2 adsorption-desorption parameters of the solids obtained by calcining silica-Triton XN mesophases are governed by the hydrophilicity of the surfactant, which in turn depends on the length of the PEO chains and on the acid content. Increased hydrophilicity leads to a decrease in the surface area, pore volume and pore diameter of the products.

Item Type: Article
Uncontrolled Keywords: chemistry(all),materials chemistry ,/dk/atira/pure/subjectarea/asjc/1600
Faculty \ School: Faculty of Science > School of Pharmacy
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 09 Jul 2021 07:28
Last Modified: 09 Jul 2021 07:28
URI: https://ueaeprints.uea.ac.uk/id/eprint/80475
DOI: 10.1039/b001875i

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