磁性高分子复合微球的研究与应用进展

论述了单体聚合法制备磁性高分子复合微球的研究近况,主要介绍了非中空磁性高分子复合微球的无皂乳液聚合、种子乳液聚合、Pickering乳液聚合、细乳液聚合、反相乳液聚合、原位乳液聚合及分散聚合等制备方法及中空微球的设计与制备方法.概述了磁性高分子复合微球在固定化酶、DNA分离提纯、药物载体等方面的应用.最后对磁性高分子复合微球的发展趋势进行了展望.     

磁性微球制备方法

在总结近年来国内外有关磁性微球研究成果的基础上,对磁性微球进行了分类,着重对高分子磁性微球的几种主要制备方法和工艺过程进行了概述。     

磁性聚合物研究与应用现状

概述了磁性聚合物的研究与应用近况,重点讨论了磁性高分子微球的分类、制备方法及其应用,并对磁性聚合物的发展趋势进行了展望.     

专利集锦

纳米磁性微球和纳米磁性免疫微球及其制备方法和应用公开号:CN1688001公开日:2005.10.26申请人:深圳市人民医院     

磁场和磁性材料在肿瘤治疗中的应用

首先详细介绍了恒定磁场、脉冲磁场、磁性药物微球和磁性微波吸收剂在肿瘤治疗中的原理和现状,然后分析了磁场和磁性材料在肿瘤治疗中的应用前景。     

壳聚糖磁性微球的制备和工艺参数的优化

采用悬浮交联法制取壳聚糖磁性微球,优化了制备工艺。考察了交联剂的种类和用量、反应体系的pH值、壳聚糖与磁核加入量的比值以及搅拌速度等因素对磁球性能的影响。结果表明,戊二醛做交联剂交联强度较大,与甲醛相比,更有利于壳聚糖交联反应生成球形的壳聚糖磁球;反应体系的pH值4.4～6.7为宜;壳聚糖与磁核微粒的加入量的比值为1∶1时最佳;搅拌速度为1400～1600r/min时反应生成的磁性微球粒度较小、粒径较均匀,成球性好。     

表面改性聚苯乙烯磁性微球的制备与性能

采用共沉淀法制备了Fe3O4纳米粒子,用表面硅烷化改性得到分散性良好的纳米Fe3O4磁流体,以苯乙烯(St)、甲基丙烯酸甲酯(MMA)为单体,采用无皂乳液聚合法制备了羧基聚苯乙烯磁性微球。运用红外光谱(FT-IR)、透射电子显微镜(TEM)、X射线衍射(XRD)、振动样品磁强计(VSM)、热失重(TG)等手段,对复合微球的组成成分、形貌及粒径、磁学性能及Fe3O4的含量进行了表征。结果表明,Fe3O4/PS磁性微球粒径均匀,呈比较规整的球形,表面带羧基功能基团,磁响应性能与磁流体用量有关,最高饱和磁化强度为34.1A.m2/kg。     

专利集锦

以纳米球形聚电解质刷为微反应器制备磁性粒子的方法公开号:CN101630555公开日:2010.01.20申请人:华东理工大学本发明涉及一种以纳米球形聚电解质刷为微反应器原位合成磁性粒子的方法。整个制备过程分为四步完成:第一步,采用细乳液聚合法得到粒径在80～200nm的聚合物微球;第二步,在细乳液     

磁性纳米材料在分离和检测中的应用研究进展

磁性纳米材料应用于生物、环境等众多领域近年来受到了广泛关注。磁性纳米粒子经过适当的表面修饰,可高度选择性地结合目标分子,在解决目标物的快速分离检测及高特异性的选择性分离检测方面具有优势。本文介绍了磁性纳米粒子在分离(包括水处理中的离子吸附分离、水处理中有机物吸附分离、膜分离、生物分离和其他分离)及分析检测(包括水体检测、生物监测、食品安全检测)中的应用,对多功能磁性纳米粒子的构建及其在分离及分析检测领域中的应用具有指导意义。     

Fe3O4/壳聚糖核壳磁性微球的制备及特性

以Fe3O4作为磁性内核,利用液体石蜡作有机分散介质,甲醛、戊二醛作交联剂,通过反相悬液交联法制备了单分散、窄分布的强磁性Fe3O4/壳聚糖核壳微球。对磁粉内核的制备条件及微球性能进行了研究,并对产物进行了初步的性能表征。     

Three dimensional arrays of hollow gadolinia-doped ceria microspheres prepared by r.f. magnetron sputtering employing PMMA microsphere templates

Preparation of macroporous gadolinia-doped ceria (CGO) films was attempted by r.f. magnetron sputtering. A polymethylmethacrylate (PMMA) microsphere film was fabricated as a template on a Pt-coated silicon substrate by dripping a PMMA microsphere aqueous dispersion onto the substrate. CGO was deposited onto the PMMA microspheres by sputtering; the PMMA microspheres were found to shrink during the sputtering, and thus the CGO also coated the surface of PMMA microspheres beneath the top layer of the film. Films (ca. 1.5 μm thick) consisting of three dimensional arrays of hollow CGO microspheres (ca. 700 nm in diameter) with large porosity were obtained after annealing the CGO/PMMA microsphere composite film.     

纳米Si/C复合微球材料制备及电化学性能表征

通过高温热解法合成不同纳米硅含量的Si/C复合微球材料并对其形貌及电化学性能进行了探究。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、恒电流充放电和循环伏安测试等技术对样品进行表征分析。电化学测试结果表明:当样品中的硅含量为8%(质量分数)时,制备的纳米Si/C复合微球负极材料在100 m A/g的电流密度下,首次可逆充电比容量为532.0 mAh/g,循环100次后,比容量可稳定在321.8 mAh/g。该结果归因于无定形碳良好的导电性及较高的比表面积。     

微球轴承支撑的集成电磁微型汽轮发电系统设计

为实现碳氢化合物发电机的小型化,提高微机电系统的集成性和发电效能,设计了一种微球轴承支撑的电磁微型涡轮发电机系统,由一种具有高磁通密度的厚磁性元件的硅微涡轮转子和一种具有最佳磁通连接和低压线圈电阻的薄铜片线圈组成。充分利用微球轴承的稳定性和简单性,实现了利用气流推动转子转动输出电能的集成度高和简单操作目的。对系统设计方案和关键技术的实现进行理论验证,该系统设计减少了传统发电机制造和集成的复杂度,实现高能量密度碳氢燃料能源转换电能的开发和利用。     

Design,Electromagnetic Fields,and Process of a Linear Magneto-Commutation Generator

The distribution of the magnetic fields in a linear magneto-commutation generator is studied for different positions of the moving element. Such a study is necessary for appropriate design of a magnetic system and for elimination of areas of the saturation of the magnetic circuit, as well as areas characterized by low tension values. The proposed approach results in the best utilization of the materials of the active parts and helps to increase the specific characteristics of the machine. The resulting patterns of the distribution of the magnetic field over the repeatability period can also be used to determine the averaged parameters of the generator necessary for the engineering design and the development of recommendations for the choice of the winding data and the basic ratios of the magnetic system.     

磁性纳米粒子的制备及应用

概述了国内外磁性纳米粒子的研究近况.介绍了具有广泛应用前景的磁性纳米粒子的常用制备方法,以及粒子不同于常规材料的独特效应及优异的磁学性能,并结合其特性介绍了这一新材料在磁记录材料、磁性液体、生物医学、传感器、催化、永磁材料、颜料、雷达波吸波材料以及其他领域的应用.     

Electrodynamic magnetic suspension-models, scaling laws, andexperimental results

A simple experiment illustrating the principles of electrodynamic magnetic suspension is described and test results are given. A disk-shaped coil made of insulated copper magnet wire and energized with 60 Hz AC line voltage is levitated in a stable equilibrium position above a wide aluminum plate. The mechanisms generating levitation force are identified by the use of Maxwell's equations. A lumped-parameter inductance model is used to model magnetic energy storage. By using energy methods, the current necessary to achieve coil lift-off and levitation is estimated, with good results. A stability analysis is done which shows that the levitation is stable, but underdamped. Thermal models are also developed for determining temperature rise in the coil. The magnetic scaling law is developed which shows that larger magnetic structures are more efficient in energy conversion than small ones     

粘结NdFeB磁体用粘结剂

制备粘结NdFeB磁体所用粘结剂是影响粘结磁体性能的关键因素。选择了五种不同的环氧树脂粘结剂制作粘结NdFeB磁体,分析了它们对磁体工艺性能、力学性能及磁性能的影响。认为常温下为固态、环氧值较高且与磁粉表面相容性好的树脂是制备粘结NdFeB磁体的理想粘结剂。     

The fabrication,characterization of honeycomb-type porous Ag/N-TiO2 nanomaterial and its application in SERS study

ABSTRACT

Combined template method with sol-gel method to make the mixed solution including polystyrene microsphere emulsion, TiO₂ sol and NH₃·H₂O aging at room temperature. Annealing at 500 centigrade for 2 hours on mesoporous TiO₂ nano material doped with nitrogen. Wrapped Ag nanoparticles on the surface of mesoporous TiO₂ nano material through redox reaction. The morphology and optical porosities were characterized by Scanning electron microscope (SEM), X-ray diffraction (XRD), BET tester and Surface enhanced Raman scattering (SERS). The results showed this material has excellent surface enhanced Raman effect, optical absorption effect and also has a great specific surface area.     

锂离子电池Sn-Co-C复合负极材料的合成与研究

以纳米金属氧化物和酚醛树脂为原料,采用喷雾干燥法得到前驱体,经高温碳热还原后制备了核壳结构的Sn-Co-C复合负极材料。通过XRD、SEM和TEM分析表明,生成的纳米尺度的Sn-Co合金颗粒均匀分布于碳微球内部。恒流充放电测试表明Sn-Co-C复合负极材料,首次可逆比容量为391 mAh/g,经过100次循环后比容量为307.1 mAh/g,容量保持率为78.5%。由于碳微球对纳米合金颗粒的分散包覆,缓解了充放电时的体积膨胀,抑制了纳米合金颗粒的团聚,从而使其具有较高的可逆比容量和较好的循环性能。     

The operating principles,main characteristics,and prospects of usage of controllable reactors in electric circuits

Static controllable electromagnetic reactors of different types with distinctive technical characteristics are described in the paper. The main analytical equations for designing magnetic construction elements are given. Methods are shown for the improvement of the characteristics of fast-acting magnetic reactors and the broadening of the regulating diapason without increasing the high-current harmonics by changing the construction of the magnetic reactor. The limiting of the current by a controllable reactor in the short circuit mode is also given.