微波水热法制备Mg-Al水滑石纳米晶  

Microwave-hydrothermal Synthesis and Characterization of Nano Mg-Al LDHs

作　　者：王永在[1] 陈志伟[1] 郭红[1] 

机构地区：[1]山东理工大学分析测试中心,淄博255049

出　　处：《人工晶体学报》2008年第5期1219-1223,共5页Journal of Synthetic Crystals

基　　金：山东省科技攻关(No.2007GG10003047);山东理工大学科技基金(No.306044)资助项目

摘　　要：以MgO和Al(OH)3为起始反应物,用微波水热法在180℃反应30 min,可以制备出平均晶粒度约35 nm的高结晶度单相纳米晶Mg-Al水滑石。用XRD、SEM对合成产物进行了表征。随反应温度升高和时间的延长,合成产物中杂相减少,Mg-Al水滑石晶粒度逐渐增大。在180℃反应仅1 min,即可获得平均晶粒度为约27 nm Mg-AlLDHs,杂相只有微量MgO。微波水热法能够促进起始反应物快速水解,形成Mg-Al LDHs晶核和晶粒长大。Nano Mg-Al LDHs were prepared from MgO and Al （OH）3 by microwave-hydrothermal method. Obtained reaction products were characterized by X-ray powder diffraction （XRD） and scanning electron microscopy （SEM）. Higher temperature and prolonged time are favorable to diminish impurity and increase of the crystallite sizes of Mg-Al LDHs. Only 1 min at 180 ℃ under microwave-hydrothermal conditions can fabricate nearly phase pure Mg-Al LDHs. Single phase of Mg-Al LDHs with the average crystallite size of about 35 nm can be synthesized at 180 ℃ for 30 min. Results indicate that microwave- hydrothermal conditions can profoundly promote dissociation rate of the precursors, accelerate nucleation and growth rates of Mg-Al LDHs.

关 键 词：纳米晶 MG-AL水滑石 微波水热合成 

分 类 号：TB321[一般工业技术—材料科学与工程]