层状双氢氧化物和蒙脱石的剥离及其自组装

doi:10.13218/j.cnki.csdc.2018.07.006

Abstract

Abstract: Organic montmorillonite (CTA-MMT) was prepared with the method of ion exchange by using calcium-montmorillonite as raw material,sodium fluoride as sodium agent and cetyltrimethylammonium bromide (CTAB) as organic modifier.Organic layered double hydroxide (MgAl-SDS-LDH) was synthesized by hydrothermal method by using the raw materials of magnesium nitrate,aluminum nitrate,sodium hydroxide and sodium dodecyl sulfonate (SDS).Sols of exfoliated CTA-MMT and exfoliated MgAl-SDS-LDH were obtained by exfoliation of CTA-MMT and MgAl-SDS-LDH in chloroform through ultrasonication.By mixing the two sols,montmorillonite/layered double hydroxide nanocomposite (MMT/LDH) was prepared by self-assembly of exfoliated products.The structures of CTA-MMT,MgAl-SDS-LDH and their exfoliated products were characterized by XRD and AFM.The thermal stability of MMT/LDH was characterized by thermogravimetric analysis.The results show that CTA-MMT and MgAl-SDS-LDH can be exfoliated in chloroform in merely 20 min.The average thicknesses of exfoliated CTA-MMT and exfoliated MgAl-SDS-LDH are about 9 and 8 nm,respectively.MMT/LDH is a self-assembling material which is assembled orderly by exfoliated CTA-MMT and exfoliated MgAl-SDS-LDH,and the structure of MMT/LDH is influenced by the content of exfoliated MgAl-SDS-LDH and exfoliated CTA-MMT.The interlayer spacing of MMT/LDH decreases with the increase of content of exfoliated CTA-MMT,from 2.59 nm (in the case of low content of CTA-MMT) to 1.82 nm (in the case of high content of CTA-MMT).Furthermore,the thermostability of MMT/LDH is better than that of pristine CTA-MMT or MgAl-SDS-LDH.

Key words: surfactant, montmorillonite, layered double hydroxide, chloroform, exfoliation, self-assembly

CLC Number:

TQ423.9

DAI Lu-xun,LIANG Shao-bin,CHEN Yao,XIE Xiang-li,LI Cun-jun,WANG Lin-jiang. Exfoliation of layered double hydroxide and montmorillonite and their self-assembly[J].China Surfactant Detergent & Cosmetics, 2018, 48(7): 392-398.

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Exfoliation of layered double hydroxide and montmorillonite and their self-assembly

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