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LiMn2O4的湿法合成及锰的光度法测定研究 总被引:2,自引:0,他引:2
The LiMn2O4 spinel was prepared by wet method using Li2CO3, Mn(CH3COO)2·4H2O and CO2 as raw ma-terials. The products were measured by TG/DTA, XRD, IR. The results Showed that the sample calcined at 800℃ for 10h was well crystallized monophase product. The contents of Mn(Ⅲ) and Mn(Ⅳ) of LiMn2O4 spinel were determined simultaneously by spectrophotometric analysis with pyrophosphoric acid. 相似文献
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磁性液体的合成及生物医学应用 总被引:6,自引:0,他引:6
本文综述了纳米磁粉的化学合成及磁性液体的一般制备方法及其磁性、磁流变性和磁熵热效应等在靶向给药、栓塞治疗、温热治疗上的应用。 相似文献
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采用流变测试技术考察了两种阴离子表面活性剂油酸钠(NaOA)和芥酸钠(NaOEr)在四丁基溴化铵(TBAB)和KCl诱导下构筑蠕虫状胶束的行为.随着KCl浓度增加, NaOA水溶液粘度增加,而加入TBAB使NaOA-KCl样品的粘度持续降低.与之相反, TBAB浓度的增加却使NaOEr-KCl样品的粘度大幅度增强.此外, NaOEr分子比NaOA表现出更强的形成胶束的能力,构成粘弹性蠕虫状胶束所需表面活性剂浓度和盐浓度更少.本文采用TBAB和KCl两种盐协同诱导NaOEr,制备了具有强粘弹性的阴离子蠕虫状胶束,探讨了盐TBAB/KCl对长链阴离子表面活性剂构筑蠕虫状胶束的影响机理. 相似文献
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The paper first reported the preparation of ultrafine Fe3O4 powder about 8~10nm by improved chemical pre-cipitation method, then turned it into magnetic fluid. The phase analysis, morphology, ultrafine powder size and magnetic property were measured by XRD, TEM and vibrating sample magnetometer(VSM),respectively. In ad-dition, a new method , by analyzed the suspending percentage of Fe3O4 powder, was introduced to study the effects of concentration, pH value, centrifugal rate and time on the stability of the magnetic fluid. 相似文献
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含羧基磁性高分子微球的合成与表征 总被引:13,自引:0,他引:13
在共沉淀法合成超细磁粉的基础上,以苯乙烯(St)和丙烯酸为共聚单体,以过氧化苯甲酰(BPO)为引发剂,用分散聚合法得到了含羧基的具有核壳结构的磁性高分子微球。采用XRD、TEM、SEM、IR等对样品进行了表征。表征结果表明:制备的磁粉为Fe3O4单相,磁粉的粒径为10 nm左右,微球粒径大约在1~5 μm,呈球形,微球中存在羧基。VSM磁性能测试结果表明:用PEG4000作为表面活性剂时,样品的磁性能最强。分散剂和分散介质对微球形貌和粒度均有影响。 相似文献
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