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以碳包铁(Fe@C)纳米粉作为磁性内核,用海藻酸钠作表层高分子,以正庚烷为油相,AOT为表面活性剂,氯化钙、环氧氯丙烷作交联剂,通过反相微乳法制备出了碳包铁/海藻酸钠核壳微球,系统考察了海藻酸钠的浓度、交联剂用量等对所制复合纳米微球性质的影响,并对产物进行了初步的性能表征。结果表明,选择合适的海藻酸钠的浓度、交联剂用量和其它相关参数,可以制备出外观为球形、分散性好、平均粒径约为250nm、具有强磁响应性的复合微球。
Using Fe @ C nano-powder as magnetic core, sodium alginate as surface layer polymer, n-heptane as oil phase, AOT as surfactant, calcium chloride and epichlorohydrin as crosslinking agent , The carbon-coated iron / sodium alginate core-shell microspheres were prepared by reverse microemulsion method. The effects of the concentration of sodium alginate and the amount of crosslinking agent on the properties of the prepared composite nanospheres were investigated systematically. A preliminary performance characterization was performed. The results show that composite microspheres with spherical shape, good dispersibility, average particle diameter of about 250 nm and strong magnetic response can be prepared by selecting the appropriate concentration of sodium alginate, the amount of crosslinking agent and other relevant parameters.