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Thermal decomposition of silylated layered double hydroxides

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Abstract

Anionic surfactant and silane modified layered double hydroxides (LDHs) were synthesized through an in situ coprecipitation method. The structure and morphology were characterized by XRD and TEM techniques, and their thermal decomposition processes were investigated using infrared emission spectroscopy (IES) combined with thermogravimetry (TG). The surfactant modified LDHs (H-DS) shows three diffractions located at 1–7° (2θ), while there is only one broad reflection for silane grafted LDHs (H–Si) in this region. The morphologies of the H-DS and H–Si show fibrous exfoliated layers and curved sheets, respectively. The IES spectra and TG curves indicate that alkyl chain combustion and dehydroxylation are overlapped with each other during heating from 373 to 723 K in H-DS and to 873 K in H–Si. Sulfate anion transformation process occurs at 473 K in H-DS and 523 K in H–Si. The derivant of sulfate can exist even above 1073 K. After further decomposition, the metal oxides and the new type of Si–O compounds are formed beginning at around 923 K in silane modified sample.

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Acknowledgements

This is contribution No. IS-1122 from GIGCAS. The financial and infra-structure supports of the National Science Fund for Distinguished Young Scholars (Grant No. 40725006) and Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX2-yw-112) are acknowledged. The financial and infra-structure support of the Queensland University of Technology Inorganic Materials Research Program of the School of Physical and Chemical Sciences is gratefully acknowledged. The Australian Research Council (ARC) is thanked for funding. Qi Tao is grateful to The China Scholarship Council for the overseas funding to visit QUT.

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Authors and Affiliations

  1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China

    Qi Tao, Hongping He, Peng Yuan & Jianxi Zhu

  2. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD, 4001, Australia

    Qi Tao, Hongping He & Ray L. Frost

  3. Graduate School of Chinese Academy of Sciences, Beijing, 100039, China

    Qi Tao

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  1. Qi Tao
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  2. Hongping He
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Correspondence to Hongping He.

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Tao, Q., He, H., Frost, R.L. et al. Thermal decomposition of silylated layered double hydroxides. J Therm Anal Calorim 101, 153–159 (2010). https://doi.org/10.1007/s10973-009-0548-8

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  • DOI: https://doi.org/10.1007/s10973-009-0548-8

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