摘要
探索了采用三步法制备液芯磁性微囊的新方法。采用喷雾法制备了磁性海藻酸钙微球,用激光粒度仪测得微球平均粒径为130μm。通过合成脲甲醛树脂对磁性海藻酸钙微球进行包覆,详细研究了脲甲醛预聚和缩聚条件对包覆结果的影响。最后对脲甲醛树脂包覆后的磁性海藻酸钙微球进行液化,结果表明,在一段时间内,液化效果受柠檬酸钠溶液浓度和pH值影响明显;最终微囊液化效果良好,体积增大,内部的磁性粒子向囊心集聚。
A new three-step method of preparing liquid magnetic microspheres is explored. Magnetic Ca-alginate microspheres are prepared by spray method, and their average diameters is 130μm measured using laser granularity instrument. Encapsulating magnetic Ca-alginate microspheres by urea formaldehyde （UF） resin, and the effect of UF additive and condense conditions on encapsulating results are studied in detail. The encapsulated microspheres is liquefied. The results indicate the concentration of sodium citrate and pH value can obviously affect the liquefaction in a period of time. In addition, the microspheres can be liquefied well, however, whose volume will be expanded with internal magnetic particles flowed in the center since the magnetic particles can attract each other. Key words nano-Fe3O4, Ca-alginate mierospheres, UF resin, liquefy, magnetism microcapsule
出处
《材料导报》
EI
CAS
CSCD
北大核心
2010年第10期94-98,共5页
Materials Reports
基金
上海市重点学科项目(T0503
P0502)
上海市教委项目(05EZ21)
上海市研究生创新基金项目(JWCXSL0802)
