基于蒙脱石和层状双氢氧化物纳米剥离的层层自组装异构薄膜制备  

Preparation of Heterogeneous Films by Layer-by-layer Self-assembly Based on Exfoliation of Montmorillonite and Layered Double Hydroxide

作　　者：陈耀[1] 谢襄漓[2] 李存军[1] 梁启超[1] 林茵茵[1] 王昕[1] 朱文凤[1] 王林江[1,3] 

机构地区：[1]桂林理工大学材料科学与工程学院,桂林541004 [2]桂林理工大学化学与生物工程学院,桂林541004 [3]广西有色金属及特色材料加工省部共建国家重点实验室培育基地,桂林541004

出　　处：《人工晶体学报》2016年第5期1293-1298,1304,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(41272064;41572034)

摘　　要：以乙酸乙酯为剥离介质,采用超声法剥离有机蒙脱石(CTA-MMT)和层状双氢氧化物(Mg Al-SDS-LDH),以聚乙烯醇(PVA)为交联剂,采用层层自组装(LBL)的方法制备了蒙脱石-层状双氢氧化物异构薄膜(PVA/MMT/PVA/LDH)n。采用X射线衍射分析(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、原子力显微镜(AFM)和紫外-可见光分光光度计对样品进行了表征。结果表明,超声剥离处理后的CTA-MMT和Mg Al-SDS-LDH片层厚度分别达到17 nm和12 nm。(PVA/MMT/PVA/LDH)n异构薄膜层间距为1.81 nm,一个组装循环得到以MMT和LDH纳米片层构成薄膜单循环片层,厚度约为170 nm。薄膜对264 nm左右的光呈现强烈的吸收带,并且吸收强度与薄膜厚度之间呈线性关系,表明薄膜单元层具有良好均一性。Organo-montmorillonite（CTA-MMT） and organic-layered double hydroxide（Mg Al-SDS-LDH）were exfoliated by ultrasonication in ethyl acetate.Heterogeneous films of（PVA/MMT/PVA/LDH）nwas fabricated by layer-by-layer self-assembly（LBL） using exfoliated MMT and LDH nanosheets as assembly unit.The specimens were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）,atomic force microscopy（AFM） and UV-vis spectroscopy.The results show that the thickness of exfoliated CTA-MMT and exfoliated Mg Al-SDS-LDH nanosheets is about 17 nm and 12 nm,respectively.The spacing of the heterogeneous films is 1.81 nm.Each unit layer of heterogeneous films was comprised of CTA-MMT and Mg Al-SDS-LDH nanosheets inone deposited cycle with each unit thickness of 170 nm.UV-vis spectroscopy shown that the heterogeneous films exhibited a strong absorption band at wavelength around 264 nm.The linear relationship between absorbance and thickness of the heterogeneous films indicate the homogeneous structure of（PVA/MMT/PVA/LDH）n.

关 键 词：蒙脱石 层状双氢氧化物 层层自组装 

分 类 号：O484[理学—固体物理]