Tailoring surface properties and structure of layered double hydroxides using silanes with different number of functional groups

Tao, Qi, He, Hongping, Li, Tian, Frost, Ray L., Zhang, Dan, & He, Zisen (2014) Tailoring surface properties and structure of layered double hydroxides using silanes with different number of functional groups. Journal of Solid State Chemistry, 213, pp. 176-181.

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Four silanes, trimethylchlorosilane (TMCS), dimethyldiethoxylsilane (DMDES), 3-aminopropyltriethoxysilane (APTES) and tetraethoxysilane (TEOS), were adopted to graft layered double hydroxides (LDH) via an induced hydrolysis silylation method (IHS). Fourier transform infrared spectra (FTIR) and 29Si MAS nuclear magnetic resonance spectra (29Si MAS NMR) indicated that APTES and TEOS can be grafted onto LDH surfaces via condensation with hydroxyl groups of LDH, while TMCS and DMDES could only be adsorbed on the LDH surface with a small quantity. A combination of X-ray diffraction patterns (XRD) and 29Si MAS NMR spectra showed that silanes were exclusively present in the external surface and had little influence on the long range order of LDH. The surfactant intercalation experiment indicated that the adsorbed and/or grafted silane could not fix the interlamellar spacing of the LDH. However, they will form crosslink between the particles and affect the further surfactant intercalation in the silylated samples. The replacement of water by ethanol in the tactoids and/or aggregations and the polysiloxane oligomers formed during silylation procedure can dramatically increase the value of BET surface area (SBET) and total pore volumes (Vp) of the products.

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4 citations in Web of Science®

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ID Code: 83642
Item Type: Journal Article
Refereed: Yes
Keywords: Layered double hydroxide, Silylation, Surface properties, Porosity, Si MAS NMR
DOI: 10.1016/j.jssc.2014.02.032
ISSN: 0022-4596
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Elsevier
Deposited On: 16 Apr 2015 06:07
Last Modified: 16 Apr 2015 06:07

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