明胶-阿拉伯树胶电子墨水微胶囊表界面控制

Control of surface and inferface of microencapsulated electronic inks by complex coacervation

摘要:

文以明胶—阿拉伯树胶为壁材，四氯乙烯为分散介质，硬脂酸改性的TiO2为显示颗粒，采用复合凝聚法制备了红白显示的电子墨水微胶囊。讨论了表面活性剂十二烷基硫酸钠（SDS）对复合凝聚相的生成过程中的影响，并分析了Span80用量微胶囊形貌的影响。结果表明，SDS与明胶间形成的复合相具有很高的表面活性。加入SDS将促进油相液滴表面复合凝聚相的生成。此外，Span浓度增加到2.0-3.0%时，制备的微胶囊囊壁光滑、均一，平均粒径约为60μm。制备的微胶囊在电场强度为2.5V/μm时，具有良好电场响应行为及可逆移动性。

Abstract:

the electronic ink microcapsules containing TiO2 nanoparticles modified with stearic acid dispersed in Tetrachloroethylene（TCE）were prepared by complex coacervation using Gelatin-Gum acacia as wall materials. The influence of SDS on complex coacervation was discussed. The influence of Span on surface morphology of the electronic ink microcapsules was also studied. The results showed there was high surface activity existed complex coacervation generated between SDS and gelatin. Furthermore, When the concentration of Span 80 increased to 2.0-3.0 %, the microcapsules can be prepared with regular morphology and transparent and smooth surface, the average diameter was ~60 μm. Finally, the particles in microcapsules possessed reversible response to dc under the electric field intensity of 2.5V/μm