Department of Materials Science and Advanced Coatings Research Center of China Educational Ministry, Fudan University, Shanghai 200433, PR China.
Langmuir. 2010 May 4;26(9):6604-9. doi: 10.1021/la903938s.
This paper presents a novel and facile approach to fabricate robust crystal balls directly through the self-assembly of soft colloidal polymer spheres by the aid of nano silica using an electrospraying technique. In this approach, soft colloidal polymer spheres are synthesized by emulsion polymerization and then blended with colloidal silica to obtain nanocomposite dispersion. When this dispersion is loaded into an injector and forced to flow through the nozzle under direct electric field, the detached droplets are collected by an oil solvent. As water and solvent evaporate, the colloidal polymer spheres and silica beads can directly self-assemble into robust crystal balls. Neither soft matrix nor post-treatment is needed. The obtained crystal balls have not only excellent mechanical properties to withstand external forces such as cutting, puckering, and bending, but also reversible deformation.
本文提出了一种新颖而简便的方法，通过电喷雾技术利用纳米二氧化硅辅助软胶体聚合物球自组装直接制备坚固的晶体球。在该方法中，软胶体聚合物球通过乳液聚合合成，然后与胶体二氧化硅混合以获得纳米复合材料分散体。当将该分散体装入注射器中并在直流电场下迫使通过喷嘴流动时，通过油溶剂收集分离的液滴。随着水和溶剂的蒸发，胶体聚合物球和二氧化硅珠可以直接自组装成坚固的晶体球。既不需要软基质也不需要后处理。所得到的晶体球不仅具有优异的机械性能，可以承受切割、起皱和弯曲等外力，而且还具有可恢复的变形能力。
