Journal
APPLIED SURFACE SCIENCE
Volume 255, Issue 7, Pages 4334-4340Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2008.11.030
Keywords
Layered double hydroxide; Hydrotalcite; Anionic surfactant; Silylation; Surface properties; TEM; FTIR; TG
Categories
Funding
- National Natural Science Foundation of China [40572023]
- National Science Fund for Distinguished Young Scholars [40725006]
- Queensland University of Technology Inorganic Materials Research
- The Australian Research Council
- The China Scholarship Council
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A class of nanomaterials based upon the surface modi. cation of layered double hydroxides (LDHs) have been synthesized by grafting silanes onto the surfaces of the LDH. By in situ coprecipitation, the surfaces of a LDH have been modified through grafting of 3-aminopropyltriethoxysilane (APTS) using the anionic surfactant Na-dodecylsulfonate (SDS). The synthesized nanomaterials were characterized by X-ray diffraction (XRD), attenuated total reflection Fourier-transform infrared spectroscopy (ATR FTIR), thermogravimetry (TG) and transmission electron microscopy (TEM). The grafted LDH (LDH-G) displays distinct XRD patterns proving the obtained materials are a new and different phase. The FTIR spectra of the silylated hydrotalcite show bands attributed to Si-O-M (M = Mg and Al) vibration at 996 cm(1), suggesting that APTS has successfully been grafted onto the LDH layers. The TG curves prove the grafted sample has less M-OH concentration and less interlayer water molecules, as indicated by the M-OH consumption during the condensation reaction between Si-OH and M-OH on the LDH surface. The grafted sample displays a ribbon-like thin sheet in the TEM images, with the lateral thickness estimated as 2.5 nm. (C) 2008 Elsevier B. V. All rights reserved.
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