Department of Physics, Nanjing Normal University, Nanjing 210097, China.
Langmuir. 2013 Feb 12;29(6):1796-801. doi: 10.1021/la3040227. Epub 2013 Jan 28.
We have developed an inexpensive, robust, and easily controlled method, a gravity-assisted convective self-assembly method, to fabricate centimeter-sized uniform two-dimensional colloidal crystals. In this method, centimeter-sized two-dimensional colloidal crystals can be formed when the suspension concentration is in the range of 0.32-2.5 wt %. Once the ordering process starts, the formation of two-dimensional colloidal crystals is not affected when the environmental temperature gradually increases from 3 to 10 °C. Experimental results indicate that, in this method, gravity plays an important role in the colloidal crystal formation. The colloidal particles are transported to the edge of the suspension-glass interface, and the extra particles can be eventually moved to the edge of the slide by gravity.
我们开发了一种廉价、坚固且易于控制的方法，即重力辅助对流自组装方法，用于制备厘米级均匀的二维胶体晶体。在该方法中，当悬浮液浓度在 0.32-2.5wt%范围内时，可以形成厘米级的二维胶体晶体。一旦开始有序化过程，当环境温度从 3°C 逐渐升高到 10°C 时，二维胶体晶体的形成不会受到影响。实验结果表明，在该方法中，重力在胶体晶体形成中起着重要作用。胶体粒子被运送到悬浮液-玻璃界面的边缘，多余的粒子最终可以通过重力被运送到载玻片的边缘。
