Niemann Björn, Veit Peter, Sundmacher Kai
Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstrasse 1, Magdeburg, Germany.
Langmuir. 2008 Apr 15;24(8):4320-8. doi: 10.1021/la703566v. Epub 2008 Feb 29.
In this work, a detailed experimental analysis of the nanoparticle formation dynamics and the formation mechanism in a reverse microemulsion system is given. The precipitation of barium sulfate nanoparticles inside microemulsion droplets is investigated at the molecular scale with respect to the evolution of the particle size distribution and the particle morphology by an extensive transmission electron microscope (TEM) analysis. Different mixing procedures (feeding strategies) of two reactants, barium chloride and potassium sulfate, are evaluated concerning their ability for a tailored particle design under consideration of the complete particle size distribution (modality and polydispersity). It is shown that improved knowledge about the particle formation mechanisms, the dynamics, and the influence of the colloidal microemulsion structure could be used for a tailored design of particles,for example, controlled synthesis of nanoparticles with a bimodal particle size distribution by the application of a sophisticated feeding strategy.
在这项工作中，对反向微乳液系统中纳米颗粒的形成动力学和形成机制进行了详细的实验分析。通过广泛的透射电子显微镜（TEM）分析，在分子尺度上研究了微乳液滴内硫酸钡纳米颗粒的沉淀，涉及粒径分布和颗粒形态的演变。考虑到完整的粒径分布（模态和多分散性），评估了两种反应物氯化钡和硫酸钾的不同混合程序（进料策略）对定制颗粒设计的能力。结果表明，关于颗粒形成机制、动力学以及胶体微乳液结构影响的更多知识可用于颗粒的定制设计，例如，通过应用复杂的进料策略来控制合成具有双峰粒径分布的纳米颗粒。
