CAJ | 학술논문

以纳米Fe_3O_4为磁核,分别采用溶胶-凝胶法和氟钛酸铵还原的液相沉积法制备了高磁性核壳式结构的Fe_3O_4/TiO_2复合颗粒;利用X射线衍射、透射电子显微镜、磁滞回线对制备的复合颗粒进行了表征,并考察了复合颗粒的包覆完整性.表征结果显示,液相沉积法制备的复合颗粒能够将磁核完全包覆.进一步研究了液相沉积法的原料配比、加料方式对复合颗粒的磁性和完整包覆率的影响.实验结果表明,当Fe与Ti的摩尔比为1:0.8且氟钛酸铵溶液和硼酸溶液分4次流加时,制得了高磁性的Fe_3O_4/TiO_2复合颗粒,其完整包覆率为13.4%,饱和磁化强度为22.86 emu/g.
이납미Fe_3O_4위자핵,분별채용용효-응효법화불태산안환원적액상침적법제비료고자성핵각식결구적Fe_3O_4/TiO_2복합과립;이용X사선연사、투사전자현미경、자체회선대제비적복합과립진행료표정,병고찰료복합과립적포복완정성.표정결과현시,액상침적법제비적복합과립능구장자핵완전포복.진일보연구료액상침적법적원료배비、가료방식대복합과립적자성화완정포복솔적영향.실험결과표명,당Fe여Ti적마이비위1:0.8차불태산안용액화붕산용액분4차류가시,제득료고자성적Fe_3O_4/TiO_2복합과립,기완정포복솔위13.4%,포화자화강도위22.86 emu/g.
Fe_3O_4/TiO_2 composite particles were prepared using Fe_3O_4 nanoparticles as magnetic core,separately via with by sol-gel method and chemical liquid solution deposition method with reduction of ammonium fluorotitanate.Characterizations by means of XRD,TEM,hysteresis loop and degree of surface coverage illustrated that chemical liquidsolution deposition method wais efficient in covering the surface of Fe_3O_4 cores by with TiO_2.Effects of mole ratio and feeding mode of reactants in chemical solutionliquid deposition method were further studied.Highly magnetic Fe_3O_4/TiO_2 composite particles could be obtained with coverage ratio of 13.4% and saturated magnetization of 22.86 emu/g,when n(Fe):n(Ti) was 1:0.8 by batchwise technique.It is preferred that the solutions containing ammonium fluotitanate and boric acid were added in four-times.