Abstract: Magnetophoresis microcapsules were prepared by using a complex coacervation with gelatin and arabic gum as film materials, and magnetic particles and TiO2 particles suspended in a mixture solution of di-n-butyl phthalate and C2Cl4 as inner medium. The prepared microcapsules with the sizes of 200~300 mm has transparent, smooth and elastic wall, which can be conserved for a long period. After coating and drying, the microcapsules form a flexible film which can be used for displaying and reuse in many times. The film can clearly display defects in standard samples with 100 mm width and 15 mm depth. The formation process of the microcapsules and the shape change presented were analyzed.

Key words: magnetophoresis, microcapsule, display, defect detection, complex coacervation

摘要： 采用复凝聚法，以明胶和阿拉伯胶为凝聚材料、含磁性颗粒与TiO2颗粒的悬浮液作为内相，制备出粒径在200~300 mm的囊壁透明、光滑、具有一定韧性的微胶囊. 所制微胶囊经涂膜干燥后，形成柔性且可重复使用的磁性显示膜，能显示磁粉探伤用国家A1型标准试片中宽100 mm、深15 mm的刻痕. 阐述了微胶囊形成过程，分析了囊壁凹陷的原因及漏磁场分布和磁性颗粒的受力情况.

关键词: 磁泳, 微胶囊, 显示, 探伤, 复凝聚法