Advancement of Research about Superparamagnetic Contrast Agents;
超顺磁性造影剂的研究进展
The picture of the optical microscope and magnetic loop showed it was possessed of good dispersion and superparamagnetic behavior.
光学显微镜照片和磁滞回线显示微球在水中分散均匀,表现出超顺磁性;红外谱说明微球表面含有羧基基团;通过电导率仪测试,计算出了微球表面羧基含量,并发现其随甲基丙烯酸单体含量的增加呈非线性增加。
Hollow superparamagnetic Fe3O4 nanospheres were prepared by co-precipitating iron (Ⅱ) and iron (Ⅲ) chloride salts in the presence of sodium hydroxide at 80℃.
利用聚氧乙烯-聚氧丙烯-聚氧乙烯嵌段共聚物F127作为模板采用共沉淀法制备了空心超顺磁性Fe3O4纳米微球并用X射线衍射(XRD)和透射电子显微镜(TEM)进行了表征,纳米微球的大小为55-75nm,壳的厚度为7nm左右,颗粒大小均匀、在水溶液中分散良好。
Preparation and superparamagnetism of Fe_3O_4 nanoparticles;
Fe_3O_4纳米粒子的制备与超顺磁性
Preparation and Superparamagnetism of Nano-Ni/mesoporous SiO_2 Composites;
纳米Ni/SiO_2介孔复合体的制备与超顺磁性
The results indicated that The introduction of MgO and Fe_3O_4 delays the transition from T-ZrO_2 to M-ZrO_2;the magnetic solid superacid catalysts have superparamagnetism because of the existence of Fe_3O_4 particles;The samples show well-defined crystallographic faces and the average size in diameter is 30nm;The HRTEM shows that .
29nm;磁性基质的引入赋予了固体超强酸以超顺磁性;Hammett指示剂法测得经800℃焙烧后产物的酸强度Ho<-13。
The results showed that the composite had super-paramagnetism, low water absorption and high tensile strength compared with pure PI.
采用化学合成法及溶胶凝胶工艺制备了聚酰亚胺(PI)/纳米Fe2O3复合材料,采用古埃法、傅立叶变换红外光谱分析、吸水性能测试、拉伸性能测试等表征了材料的结构及特有的超顺磁性。