纳米氢氧化钙防团聚干燥研究  

Research on the influence of different drying methods to the agglomeration prevention of nano-Ca(OH)_2

作　　者：许兢[1] 钱庆荣[1] 陈庆华[1] 

机构地区：[1]福建师范大学化学与材料学院环境科学系,福州350007

出　　处：《化工新型材料》2008年第10期93-96,共4页New Chemical Materials

基　　金：福建师大扶苗基金(F024);教育部"新世纪优秀人才支持计划"(NCET-04-0614)资助项目

摘　　要：干燥阶段的团聚问题是液相法制备纳米粉体的难点之一。本研究分别采用直接干燥法、溶剂置换法、共沸蒸馏法、水介质及异丁醇冷冻干燥法等处理方法制备的纳米氢氧化钙的湿凝胶,表征干燥后,比较不同方法防止纳米粉体团聚的效果,初步探讨了不同干燥工艺的防团聚机理。透射电镜和X射线衍射结果表明,共沸蒸馏干燥法防团聚效果最佳,所得氢氧化钙颗粒最均一并低于50nm,其他方法能不同程度地改善硬团聚,但直接干燥法产物存在硬团聚;而红外光谱分析表明,不同方法所采用的介质均未与氢氧化钙形成化学取代,可能只是以物理吸附的方式改善团聚。Preventing agglomeration of nano-particles during the drying progress of liquid-phase preparation is one of the most important problems. Different drying methods such as direct drying, solvent displacement drying, freeze-drying, azeotropic distillation method, were applied to prevent the agglomeration of nano-Ca（OH）2. The influence and the mechanism of drying methods were discussed according to the characterization of the samples. The results of TEM and XRD showed that azeotropic distillation method can remarkably prevent the agglomeration of nanoparticles to get the well- dispersived nano-Ca（OH）2 with even diameter of single particle smaller than 50 nm,while the Ca（OH）2 with direct drying became hard aggerated and the degree of the Ca（OH）2 could also be decreased by other methods. But the result of IR indicated that mechanism of agglomeration prevention by using different solvents in drying progress might be more likely to be physical adsorption than the chemical bond formation.

关 键 词：干燥工艺 纳米氢氧化钙 防团聚 

分 类 号：TB383.1[一般工业技术—材料科学与工程]