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以金属钴盐、铁盐及柠檬酸为原料,采用有机凝胶-热分解法成功制备了尖晶石型的CoFe2O4纤维。通过红外光谱(FTIR)、X射线衍射(XRD)、热重-差热分析(TG-DSC)以及扫描电镜(SEM)等分析手段对凝胶的结构、组成、热分解过程以及热处理产物的形貌进行了表征,并分析了影响凝胶可纺性以及纤维产生缺陷的各种因素。结果表明:在pH值为5.5左右的溶液中金属离子与柠檬酸反应形成具有线性分子结构的[(C6H6O7)4CoFe2]n,由这些线性分子所组成的凝胶显示出良好的可纺性。所制备的尖晶石型CoFe2O4纤维由40~50nm大小的晶粒组成,纤维直径可小于1μm,长径比达1×106。通过振动样品磁强计(VSM)测得这种尖晶石型CoFe2O4纤维的饱和磁化强度和矫顽力分别为81.97A·m2/kg和1041.47×79.6A/m。
Spinel CoFe2O4 fibers were successfully prepared by the organo-gel-thermal decomposition method using metal cobalt salts, iron salts and citric acid as raw materials. The structure, composition, thermal decomposition process and the shape of heat-treated products were characterized by means of FTIR, XRD, TG-DSC and SEM. The morphology was characterized and the various factors affecting the spinnability of the gel and the fiber defects were analyzed. The results showed that the metal ions reacted with citric acid in the solution of pH 5.5 to form [(C6H6O7) 4CoFe2] n with linear molecular structure, and the gels composed of these linear molecules showed good spinnability. The prepared spinel CoFe2O4 fiber is composed of crystal grains with the size of 40-50nm, the diameter of the fiber can be less than 1μm and the aspect ratio can reach 1 × 106. The saturation magnetization and coercivity of the spinel-type CoFe2O4 fibers measured by the vibrating sample magnetometer (VSM) were 81.97A · m2 / kg and 1041.47 × 79.6A / m, respectively.