纳米硫酸钡制备过程中的蒸馏法破乳和微孔液的循环使用Reuse of Microemulsion for Preparing Barium Sulfate Nanoparticles through Breaking the Microemulsion by Distillation
王敏,王玉军,朱慎林
摘要(Abstract)：
以硫酸钠和氯化钡的W/O型微乳液反应制备纳米硫酸钡为实验体系,利用微乳液中各组分沸点的差异,提出了利用蒸馏法破坏微乳液,实现纳米颗粒与微乳液体系的分离以及微乳液循环利用的新工艺。研究了破乳时蒸馏温度、循环使用时体系中的盐浓度、含水量等因素对纳米颗粒品质的影响,比较了蒸馏法破乳和加高浓度盐、升高温度等方法破乳对纳米颗粒回收率的影响。实验结果表明,蒸馏温度升高不会导致纳米颗粒的团聚,随着循环次数的增加,粒径从第一次制备的14nm增加到第五次制备的25nm,但单分散性和分布仍然良好;体系中水含量过大,制备出的纳米颗粒粒径不均一;此外蒸馏法破乳回收纳米颗粒的收率可以达到82%,高于加盐破乳和升温破乳的回收率。
关键词(KeyWords)： 微乳液;纳米颗粒;硫酸钡;蒸馏;破乳
基金项目(Foundation): 国家自然科学基金资助项目(29836130)。
作者(Author): 王敏,王玉军,朱慎林
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