Hu Zeshan, Oskam Gerko, Searson Peter C
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
J Colloid Interface Sci. 2003 Jul 15;263(2):454-60. doi: 10.1016/s0021-9797(03)00205-4.
We have synthesized ZnO nanoparticles by precipitation from zinc acetate in a series of n-alkanols from ethanol to 1-hexanol as a function of temperature. In this system, nucleation and growth are relatively fast and, at longer times, the average particle size continues to increase due to diffusion-limited coarsening. During coarsening, the particle volume increases linearly with time, in agreement with the Lifshitz-Slyozov-Wagner (LSW) model. The coarsening rate increases with increasing temperature for all solvents and increases with alkanol chain length. We show that the rate constant for coarsening is determined by the solvent viscosity, surface energy, and the bulk solubility of ZnO in the solvent.
我们通过在从乙醇到1-己醇的一系列正链烷醇中，以温度为函数从醋酸锌沉淀合成了氧化锌纳米颗粒。在该体系中，成核和生长相对较快，并且在较长时间后，由于扩散限制的粗化，平均粒径持续增大。在粗化过程中，颗粒体积随时间线性增加，这与Lifshitz-Slyozov-Wagner（LSW）模型一致。对于所有溶剂，粗化速率均随温度升高而增加，并随链烷醇链长增加而增加。我们表明，粗化的速率常数由溶剂粘度、表面能以及氧化锌在溶剂中的本体溶解度决定。
