Silylation of layered double hydroxides via an induced hydrolysis method

Tao, Qi, Zhu, Jianxi, Wellard, R. Mark, Bostrom, Thor E., Frost, Ray L., Yuan, Peng, & He, Hongping (2011) Silylation of layered double hydroxides via an induced hydrolysis method. Journal of Materials Chemistry, 21, pp. 10711-10719.

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A series of layered double hydroxides (LDHs) based composites were synthesized by using induced hydrolysis silylation method (IHS), surfactant precursor method, in-situ coprecipitation method, and direct silylation method. Their structures, morphologies, bonding modes and thermal stabilities can be readily adjusted by changing the parameters during preparation and drying processing of the LDHs. The characterization results show that the direct silylation reaction cannot occur between the dried LDHs and 3-aminopropyltriethoxysilane (APS) in an ethanol medium. However, the condensation reaction can proceed with heating process between adsorbed APS and LDHs plates. While using wet state substrates with and without surfactant and ethanol as the solvent, the silylation process can be induced by hydrolysis of APS on the surface of LDHs plates. Surfactants improve the hydrophobicity of the LDHs during the process of nucleation and crystallization, resulting in fluffy shaped crystals; meanwhile, they occupy the surface –OH positions and leave less “free –OH” available for the silylation reaction, favoring formation of silylated products with a higher population in the hydrolyzed bidentate (T2) and tridentate (T3) bonding forms. These bonding characteristics lead to spherical aggregates and tightly bonded particles. All silylated products show higher thermal stability than those of pristine LDHs.

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ID Code: 43345
Item Type: Journal Article
Refereed: Yes
Additional Information: Qi Tao was a visiting scholar/Phd student who spent 1 year under Prof. Ray Frost's supervision (RLF)
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Keywords: Silylation , LDH, hydrotalcite, surfactant
DOI: 10.1039/C1JM10328H
ISSN: 0959-9428
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2011 Royal Society of Chemistry
Deposited On: 18 Jul 2011 23:23
Last Modified: 21 Aug 2011 01:01

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