CAJ | 학술논문

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40～50 nm大小的晶粒组成,纤维直径可小于1 μm,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81.97 A·m2/kg和1041.47×79.6 A/m.
이금속고염、철염급저몽산위원료,채용유궤응효-열분해법성공제비료첨정석형적CoFe2O4섬유.통과홍외광보(FTIR)、X사선연사(XRD)、열중-차열분석(TG-DSC)이급소묘전경(SEM)등분석수단대응효적결구、조성、열분해과정이급열처리산물적형모진행료표정,병분석료영향응효가방성이급섬유산생결함적각충인소.결과표명:재pH치위5.5좌우적용액중금속리자여저몽산반응형성구유선성분자결구적[(C6H6O7)4CoFe2]n,유저사선성분자소조성적응효현시출량호적가방성.소제비적첨정석형CoFe2O4섬유유40～50 nm대소적정립조성,섬유직경가소우1 μm,장경비체1×106.통과진동양품자강계(VSM)측득저충첨정석형CoFe2O4섬유적포화자화강도화교완력분별위81.97 A·m2/kg화1041.47×79.6 A/m.
Functional spinel ferrite fibers are attractive for high-tech applications. The spinel CoFe2O4 fibres have been prepared by the organic gel-thermal decomposition process from starting materials of Co, Fe nitrate salts and citric acid.The gel spinning performance was a major factor for preparation of uniform gel fibrous precursors. It was related to the citrate-metal complex structure, and linear-type structural molecule [(C6H6O7)4CoFe2]n for the gel precursor was formed during the complexation reaction between the citric acid and metal ions at pH 5.5. As a result, the gel composed of these linear-type molecules exhibited a good spinning performance. The composition, structure of the gel precursors and products derived from thermal decomposition of these precursors were characterized by FTIR, XRD and SEM. The thermal decomposition process of the gel precursors was investigated by TG-DSC. The prepared spinel CoFe2O4 fibres having grain sizes of 40～50 nm possess the diameters of about 1μm, spect ratios up to 1×106 (length/diameter), a saturation