CAJ | 학술논문

采用一种自制的具有上下两个反应室的两级反应器,将盐溶液MgCl_2·6H_2O、AlCl_3·6H_2O和沉降剂Na_2CO_3、NaOH进行反应来合成了镁铝型层状双氢氧化物(简称Mg-Al-CO_3 LDHs)纳米粉.研究了反应物浓度、搅拌速度、表面活性剂种类对晶体结构、颗粒尺寸、和粒度分布的影响.TEM、XRD、激光粒度分布测试仪的检测结果表明:最佳反应条件下所得产物的形貌为片状,最小平均粒径为30～50 nm,尺寸分布比较均匀且结晶度较高.反应物浓度增加,颗粒尺寸变小且均匀性提高;搅拌速度增加,颗粒尺寸降低且粒度分布变窄.研究表明不同种类表面活性剂对晶体结构影响很大.
채용일충자제적구유상하량개반응실적량급반응기,장염용액MgCl_2·6H_2O、AlCl_3·6H_2O화침강제Na_2CO_3、NaOH진행반응래합성료미려형층상쌍경양화물(간칭Mg-Al-CO_3 LDHs)납미분.연구료반응물농도、교반속도、표면활성제충류대정체결구、과립척촌、화립도분포적영향.TEM、XRD、격광립도분포측시의적검측결과표명:최가반응조건하소득산물적형모위편상,최소평균립경위30～50 nm,척촌분포비교균균차결정도교고.반응물농도증가,과립척촌변소차균균성제고;교반속도증가,과립척촌강저차립도분포변착.연구표명불동충류표면활성제대정체결구영향흔대.
The nanopowders of magnesium aluminium layered double hydroxides (Mg-Al-CO_3 LDHs) were prepared from the reaction of the salt solution of MgCl_2·6H_2O, AlCl_3·6H_2O and precipitating agent of Na_2CO_3, NaOH in a two-stage reactor with up and down reaction chamber. The effects of reactant concentration, stirring speed, surfactant type on the crystal structure, particle size, and size distributionthe have been studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), laser particle size distribution analyzer. The results demonstrated that the product synthesized in the optimum conditions has excellent uniform and plate structure with a particle size of approximately 30-50 nm, and has higher degrees of crystallinity. As the reactant concentration increasing, particle size became smaller and more uniform; stirring speed increasing, particle size decreased and particle size distribution curve became narrower. The reasult also indicated that different types of surfactants have a significant influence on the crystal structure.