蒸发自组装法制备聚苯乙烯胶体晶体

采用乳液聚合法制得亚微米级聚苯乙烯单分散微球,并用蒸发自组装法在乳液气-液界面进行自上而下的层层组装,制得了厚度在450μm以上的三维有序胶体晶体。结果表明,影响胶体晶体有序性的关键因素是对蒸发速度的控制,促使胶体晶体规则排列的最主要作用力为溶液的毛细管力。在胶体晶体组装末期,随着溶剂量的减少,空间阻力逐渐增大,微球对流能力下降,造成胶体晶体的有序性降低。

Preparation of Self-Assembled Polystyrene Sphereic Colloid Crystals by a Solvent Evaporation Method

Sub-micrometer monodispersed polystyrene microspheres were synthesized by the emulsion polymerization technique.The three-dimensional ordered polystyrene colloidal crystals were fabricated on the surface of emulsion through a solvent evaporation method.We have fabricated colloidal crystals with the thickness of more than 450 μm by using this method.It was found that the key factor of preparation of colloidal crystal was the evaporation rate.The capillary force was the main driving force for the regular assembling of the colloidal crystal.With the decrease of solvent,the floating capability of microspheres decreased due to the increase of viscosity and caused the increase of defects.