五羰基铁雾化热分解氧化制备水溶性纳米氧化铁及磁性能研究.pdf

桂林理工大学硕士学位论文五羰基铁雾化-热分解-氧化制备水溶性纳米氧化铁及磁性能研究姓名:王行展申请学位级别:硕士专业:材料科学与工程指导教师:张宝林 201104 、工作环境好、颗粒磁性能优越,粒径均一、分散性好等优点,是磁性纳米粒子合成方法之一。本论文建立了将五羰基铁超声雾化、;在电加热器管壁内和溶液中分别进行收集,结果表明在电加热器中收集的氧化铁粒子粒径较大,水溶性难以改善,由此最后选定溶液收集方法。通过XRD、TEM、FT-IR、XPS等测试方法对五羰基铁浓度、主加热温度、载气流量、雾化液中加入三乙二醇、,并优化了合成工艺。利用羧基化聚乙二醇或甲氧基聚乙二醇分子中的羧基、醚键等功能性基团在收集阶段直接赋予合成氧化铁磁性纳米粒子水溶性和生物相容性,FT-IR测试结果也表明,。XPS结果显示合成的氧化铁纳米粒子中的铁离子大部分为三价。另外通过TEM还研究了TOPO、油酸、四甲基氢氧化铵等辅助修饰剂对合成氧化铁纳米粒子的分散性和粒径的影响,结果显示添加TOPO和四甲基氢氧化铵合成的y-Fe203磁性纳米粒子分散性最好。采用SQUID 磁性能测试仪在高强磁场下对2500C、3300C和4300C以及收集液中加入四甲基氢氧化铵合成的1 ~,结果表明随着粒径的减小,磁性纳米颗粒从顺磁性向超顺磁性转变, 的y-,有望应用于磁性造影剂研究。关键词:'y-Fe203纳米粒子;五羰基铁;超顺磁性;水溶性:修饰剂桂林理工大学硕士学位论文 Abstract The method for preparing ic iron oxide nanoparticles by thermal position andoxidation anic plex hasmany advantages,such asshort operational process,friendly work environment,superior ic performance,and monodisperse,SO is one oftheusefulsynthesis process. We have established An iron oxide nanoparticles preparation system,which contained ultrasonic atomization,segmentally thermal position and oxidation of iron pentacarbonyl,product collecting and paring maghemite nanoparticles sizescollectedintubewallofelectricheater andsolution,we choosed the latter as out finalcollecting method,because theformer maghernite nanoparticles had much larger sizeandpoorer testedby XRD andTEM,the effectof concertration of tacarbonyl,operating temperatures,carrier gas flow rate, TEG inatomization liquor,prime modifier MPEG·COOH concertration incollecting solution on position and morphologies of the prepared maghemite nanoparticles were studied,and the synthesis process was the maghemite nanoparticles were coated by MPEG-COOH or PEG-COOH,they became water soluble patible intheinfluenceofthefunctionalcarboxyl group and eth