Grogan Joseph M, Rotkina Lolita, Bau Haim H
Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2011 Jun;83(6 Pt 1):061405. doi: 10.1103/PhysRevE.83.061405. Epub 2011 Jun 16.
We report on real-time observations of the aggregation of gold nanoparticles using a custom-made liquid cell that allows for in situ electron microscopy. Process kinetics and fractal dimension of the aggregates are consistent with three-dimensional cluster-cluster diffusion-limited aggregation, even for large aggregates, for which confinement effects are expected. This apparent paradox was resolved through in situ observations of the interactions between individual particles as well as clusters at various stages of the aggregation process that yielded the large aggregates. The liquid cell described herein facilitates real-time observations of various processes in liquid media with the high resolution of the electron microscope.
我们报告了使用定制的液体池对金纳米颗粒聚集进行的实时观察，该液体池可实现原位电子显微镜观察。聚集体的过程动力学和分形维数与三维簇-簇扩散限制聚集一致，即使对于预期存在限制效应的大聚集体也是如此。通过对聚集过程各个阶段单个颗粒以及簇之间相互作用的原位观察，解决了这一明显的矛盾，这些相互作用产生了大聚集体。本文所述的液体池有助于利用电子显微镜的高分辨率对液体介质中的各种过程进行实时观察。
