Study on the Properties of MetaIIophthalocyanine-Fe_3O_4 Nanoparticles Composite

The solubility , antioxidation ability, thermal stability, coercivity Hc and long term stability of MPc-Fe3O4-nanoparticles composite(M=Co, Cu, Ni, Mn) have been studied. The results show that MFc-Fe3O4 nanoparticles composite can be easily dissolved in dilute acid. The dissolving rate of different MPc-Fe3O4 nanoparticles composite is in the following order:M=Mn-M = Co相似文献   

酞青钴-Fe_3O_4纳米复合粒子的化学稳定性研究

制备了酞菁钴（CoPc）－Fe3O4纳米复合粒子,研究了其化学稳定性．结果表明．CoPc与Fe3O4纳米粒子通过一定程度的化学键作用形成了有效的复合．在Fe3O4纳米粒子表面形成了包覆层,有效地保护其不被空气氧化。其抗氧化能力与CoPc包裹层的数目有很强的依赖关系。     

CHARACTERIZATION OF MANGANESE PHTHALOCYANINE-Fe_3O_4 NANOPARTICLE COMPOSITE AND ITS ELECTROMAGNETORHEOLOGICAL FLUID

Manganese phthalocyanine (MnPc)-Fe3O4 nanoparticles composite was prepared and characterized. The results show that MnPc are completed on the surface of Fe3O4 nanoparticles in the state of single molecule. There is effective composite between MnPc and Fe3O4 nanoparticles which can improve the antioxidization ability of Fe3O4 nanoparticles greatly. The composite was dispersed into chlorinated paraffin oil to form electromag-netorheological (EMR) fluid with high activity, and the EMR properties of this EMR fluid are studied.     

Surface Organic Modification of Fe3O4 Magnetic Nanoparticles

The surface organic modification of Fe3O4 nanoparticles with silane coupling reagent KH570 was studied.The modified and unmodified nanoparticles were characterized by FT-IR,XPS and TEM.The spectra of FT-IR and XPS revealed that KH570 was coated onto the surface of Fe3O4 nanoparticles to get Fe-O-Si bond and an organic coating layer also was formed.Fe3O4 nanoparticles were spheres partly with mean size of 18.8 nm studied by TEM,which was consistent with the result 17.9 nm calculated by Scherrer'S equation.KH570 was adsorbed on surface and formed chemistry bond to be steric hindrance repulsion which prevented nanoparticles from reuniting.Then glycol-based Fe3O4 magnetic liquids dispersed stably was gained.     

反应介质对硅烷基磁性纳米粒子表面修饰磷酸胆碱后稳定性的影响

通过改变反应介质,采用原子转移自由基聚合(ATRP)法在硅烷基Fe3O4纳米粒子表面修饰2-甲基丙烯酰氧乙基磷酸胆碱(PMPC),并对复合粒子的稳定性进行观察比较。通过红外光谱、透射电子显微镜、动态光散射手段,对复合粒子进行结构、形貌和尺寸的表征。与单纯用水作反应介质相比,用乙醇和水的混合溶液作反应介质所得到的复合粒子分散性更好,稳定性也更高,为进一步研究ATRP法中单体和引发剂对复合纳米粒子的分散性和稳定性的影响打下了基础。     

PREPARATION AND MAGNETORHEOLOGICAL PROPERTIES OF AQUEOUS SUSPENSION BASED ON EMULSION DROPLETS CONTAINING Fe_3O_4 NANOPARTICLES

The Fe3O4 nanoparticles with mean size of 10 nm were prepared by chemical common precipitation . The factors influencing the size and shape of Fe3O4 nanoparticles such as the adding rate of NaOII to the mixed solution and the final pH of the solution were studied . The Fe3O4 based magnetorheological(MR) fluid was formed by adding surfactant . The rheological properties of this MR fluid were studied when the magnetic fields with different direction are applied. It has been found that the MR fluid has the magnetic anisotropy.     

复合磁性纳米粒子的合成和特性研究

通过在磁性纳米粒子表面修饰柠檬酸得到了分散性良好的水基磁流体,为了研究磁性纳米粒子在生物医药上的应用,通过Stober法合成了Fe3O4/SiO2复合粒子。透射电镜(TEM)和红外光谱仪(IR)研究表明,SiO2成功地包裹在Fe3O4粒子表面,且复合粒子的分散性好,粒径均匀。振动样品磁强计测试表明磁性复合粒子仍然具有较强磁性。     

包覆Fe_2O_3超微粒复合共聚物的动态力学性能研究

采用种子乳液聚合法将Ｆｅ２Ｏ３超微粒包覆在苯乙烯／丙烯酸／丙烯酸丁酯（Ｓｔ／ＡＡ／ＢＡ）核－壳型复合共聚物中，形成包覆有无机粒子的有机高分子核－壳型复合微球，从微观的分子尺寸上改变了复合共聚物的性能，并着重研究Ｆｅ２Ｏ３的含量对这种复合共聚物的动态力学性能的影响。结果表明，随着Ｆｅ２Ｏ３含量的增加，复合共聚物的内耗明显增加，刚性显著下降。因而Ｆｅ２Ｏ３加入对复合共聚物有增韧作用，改善了复合共聚物的力学性能。     

Fe_3O_4有机复合物的磁流变性质研究

制备了一种新型的 Fc_3O_4有机复合物磁流变体,研究了在外磁场作用下此磁流变体中微粒的分布及粘度变化.结果表明,此磁流变体具有较强的磁流变活性。     

氧化石墨烯包覆磁性纳米粒子复合材料的制备及其对亚甲基蓝的模拟吸附

制备了一种氧化石墨烯包覆磁性纳米粒子复合材料,并运用X射线衍射、扫描/透射电镜、傅里叶红外光谱、振动样品磁强计对该复合材料进行了表征。研究结果表明,该复合材料具有Fe3O4核、氧化石墨烯壳的核壳结构,复合材料中皱纹丝状的氧化石墨烯紧密和磁性纳米粒子相连,Fe3O4成单晶状。该复合材料的制备首先在球形的Fe3O4纳米粒子表面包覆SiO2涂层,再在涂层表面赋予-NH2基,最后和氧化石墨烯反应,最终得到具有核壳结构的复合材料。对复合材料的吸附性能进行了初步模拟测试,以亚甲基蓝为吸附质,对溶液pH值、吸附剂量对吸附量的影响以及吸附等温线进行了研究,结果表明该复合材料能够在吸附后在外加磁场下快速分离,是一种优异的吸附剂。     

热疗用磁流体的热磁稳定性研究

采用两步法制备了环糊精(β-Cyclodextrin)改性纳米四氧化三铁(Fe3O4)磁流体.通过在交变磁场下感应加热对其磁热稳定性进行了研究,在交变磁场下加热后悬浮裸磁颗粒或改性颗粒的磁性液体最高升温分别达到63℃和53℃,感应加热实验结果表明所制磁流体可用于肿瘤的热疗研究.     

磁性壳聚糖表面离子液体固定化及其对丙烯酰胺吸附性能研究

以Fe3O4作为磁性纳米粒子,悬浮交联法制备磁性壳聚糖微球;以戊二醛作为交联剂在磁性壳聚糖微球表面固定离子液体;利用紫外分光光度法研究磁性壳聚糖固定化离子液体对丙烯酰胺的吸附性能.吸附动力学实验表明：2 h吸附容量为1.45 mg/g,3 h吸附基本达到平衡.结果显示：制备的磁性壳聚糖固定化离子液体对丙烯酰胺具有良好的吸附性能.     

Surface Modfication of Fe3O4 Nanoparticles

Nanometer particles are important portion of magnetic fluid. Fe3O4 magnetic nanoparticles were studied in this paper and the surface modification of Fe3O4 nanoparticles was investigated by a series of experiments. Fe3O4 magnetic nanoparticles were synthesized with pH value, temperature, and the dosage of surfactant. The phase, structure, size and magnetism of nanoparticles were tested by X-ray diffration （XRD）, transmission electron microscopy （TEM） and magnetic balance. On the basis of the surface modification coating mechanism, the experimental phenomena and the effects on the variation of size, magnetism and stability of Fe3O4 nanoparticles were theoretically analyzed. X-Ray diffraction spectrum and TEM photograph show that 1） the nanoparticles structure is perfect, 2） the diameter of narnoparticles is small and have good deliquescence, and 3） Sodium oleate is the anion surfactant. Therefore 1） the good condition of surface modification is in an acidic solution, 2） the best temperature of surface modification is at 80 ℃, and 3） the dosage of surfactant should be about 0.6 times of that of Fe^2＋.     

磁性壳聚糖微球的制备及其性能

用共沉淀法制备纳米级Fe3O4磁流体,并对其用油酸进行表面改性。采用化学交联法,在分散有磁流体的壳聚糖溶液中,加入适量的戊二醛交联剂,制得内核为磁性Fe3O4,外层包有壳聚糖的纳米级的磁性壳聚糖复合微球。考察了壳聚糖质量浓度、NaOH滴加量及搅拌速度等因素对磁性壳聚糖微球粒径、粒径分布以及形貌等对复合过程的影响,确定了制备磁性壳聚糖微球的最佳条件,并用电镜、红外光谱图、粒径分析仪等方法对磁性壳聚糖微球的形态和组成特性进行分析。最后得出平均粒径为348.5 nm,表面富含羟基、氨基和醇羟基等官能团,磁性明显、分散性良好的磁性壳聚糖微球。     

纳米Fe3O4及其复合体系的微波吸收特性研究

研究了纳米Fe3O4及其复合体系的微波吸收特性,并分析了吸收机制以及复合组分对吸波性能的影响。结果表明,在Fe3O4/BaTiO3复合体系中,通过调节材料组分可调节吸收峰的位置,复合体系的有效吸收频带较单一材料拓宽。当样品的厚度为2 mm,Fe3O4与BaTiO3的质量比为3:2时,反射率为-10 dB的有效频宽达2.7 GHz,Fe3O4与BaTiO3的质量比为2:3时,反射率为-10 dB的有效频宽可达4 GHz。在Fe3O4/PANI复合体系中,当Fe3O4在复合体系中的质量比为35%左右时,微波吸收率最高,吸收峰值为-21 dB,-10 dB频宽大于4GHz。     

电泳-电沉积法制备Ni—Fe2O3复合镀层及其氧化性能研究

先采用电泳沉积工艺在Ni基体上均匀沉积Fe2O3膜,然后采用电镀技术在Fe2O3膜中沉积金属Ni,得到含Fe2O3质量分数较高的Ni-Fe2O3复合镀层。分析了沉积电压对电泳沉积Fe2O3膜厚度的影响,研究了镀层的高温氧化性能,并对其氧化机理进行了探讨。使用傅里叶红外光谱、扫描电镜、能谱仪、X射线衍射仪对镀层的截面形貌、成分等进行了研究。结果表明：通过改变阴阳两极之间的电场强度或调整两极之间的距离,电泳沉积Fe2O3的厚度会发生很大的变化;经过一定温度热处理后,电泳沉积层中的有机物去除干净;使用电泳一电沉积法制备的Ni-Fe2O3镀层与基体之间的结合界面紧密、完整;复合沉积层在1000℃高温条件下氧化后可以得到镍铁尖晶石结构的物质。     

ZrO2陶瓷表面Cu-Ti复合渗镀研究

应用加弧辉光复合渗镀技术和自制Cu-Ti二元金属复合靶,对ZrO2陶瓷表面进行Cu-Ti复合渗镀。采用X射线能量色散谱分析（EDS）、扫描电子显微镜（SEM）面扫描、X射线衍射（XRD）、声发射划痕等试验方法对渗镀层的元素组成、成分分布、相组成、界面结合强度进行分析测试。结果表明渗镀层中存在Cu、Ti及Fe元素,各组分分布较为均匀,没有明显的成分偏聚现象;渗镀层由Cu2Ti、Cu2Ti4O、Ti8O15组成;渗镀层与陶瓷基体结合良好,在100 N最大载荷下未出现剥离和崩落现象。     

功能化四氧化三铁的合成和表征及其对钙离子的吸附

结合磁性纳米颗粒及功能基团各自的特性,设计了具有可以螯合金属离子的功能型磁性纳米颗粒,以获得选择性高、操作简易且回收后可重复利用的钙离子吸附剂.以三氯化铁和硫酸亚铁为铁源,采用化学共沉淀法在氩气保护下制备磁性纳米颗粒四氧化三铁;通过硅烷化反应在磁性纳米颗粒上依次包覆二氧化硅及γ-氨丙基三乙氧基硅烷.以甲基丙烯酸及乙二胺为原料通过迈克尔加成及酰胺化反应合成了含酰胺键、酯基、氨基功能基团的磁性纳米颗粒.X-射线粉末衍射线、傅立叶红外、扫描电镜、热重分析、X-射线光电子能谱等技术的分析结果表明已合成各中间体及功能化的纳米颗粒.原子吸收光谱研究表明该纳米颗粒可通过其配位基团按理论配比螯合钙离子.随着功能基含量的增加,吸附钙离子的能力也会随之增强,因此,含较多功能基的该类磁性纳米颗粒有望用作水中钙离子的吸附剂.     

离子型磁性液体稳定性的提高及体积分数测定

研究了离子型磁性液体的制备过程,通过重力沉降和离心处理来提高磁性液体的稳定性.样品处理前后的TEM图像和粒径分析表明,离心处理可以有效去除离子型磁性液体中大微粒和团聚体,改善粒径分布的多分散性,使其长期稳定存在.通过密度的测量分析表明,Fe（NO3）3处理后的CoFe2O4纳米微粒表面包裹有极薄的抗酸蚀层,微粒的形貌、粒径无明显变化,利用蒸干法可以准确确定水基离子型磁性液体的体积分数.     

Synthesis of Polyaniline-Fe_3O_4 Nanocomposites and Their Conductivity and Magnetic Properties

By using inorganic Fe3O4 nanoparticles of different content as nucleation sites, PAn-Fe3O4 nanorods were successfully synthesized through a simple, conventional, and inexpensive one-step in-situ polymerization method. The TEM images revealed the size and morphology of the resultant nanocomposite. The EDS pattern confirmed the existence of Fe3O4 in the composite. The FT-IR spectral analysis confirmed the formation of PAn encapsulated Fe3O4 nanocomposite. With the content of Fe3O4 increasing, the conductivity of the nanocomposites gradually decreases, meanwhile, the saturation magnetization increases and reveals a super paramagnetic behavior. With controllable electrical, magnetic, and electromagnetic properties, the well-prepared nanocomposites may have the potential applications in chemical sensors, catalysis, microwave absorbing, and electro-magneto-rheological fluids, etc.