共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
3.
5.
磁性液体是由纳米级的强磁性粒子高度分散于基液之中所形成的稳定的胶体体系。介绍了磁性液体的性质及其在机械和化工行业中在动态密封方面的应用 相似文献
6.
本文阐述了磁性液体的特性,介绍采用化学共沉淀法制备纳米级(10 nm)Fe3O4微粒的技术,并采用表面活性剂和自制的ZDW基液制备了新型憎油基磁性液体,探讨了该磁性液体在动态密封、选矿分离、扬声器以及作为磁记录材料等方面的应用,并分析了目前国内外磁性液体技术的研究水平以及该技术在国内外的发展概况. 相似文献
7.
8.
9.
10.
11.
John P. Bullivant Shan Zhao Brad J. Willenberg Bettina Kozissnik Christopher D. Batich Jon Dobson 《International journal of molecular sciences》2013,14(9):17501-17510
Feraheme, is a recently FDA-cleared superparamagnetic iron oxide nanoparticle (SPION)-based MRI contrast agent that is also employed in the treatment of iron deficiency anemia. Feraheme nanoparticles have a hydrodynamic diameter of 30 nm and consist of iron oxide crystallites complexed with a low molecular weight, semi-synthetic carbohydrate. These features are attractive for other potential biomedical applications such as magnetic fluid hyperthermia (MFH), since the carboxylated polymer coating affords functionalization of the particle surface and the size allows for accumulation in highly vascularized tumors via the enhanced permeability and retention effect. This work presents morphological and magnetic characterization of Feraheme by transmission electron microscopy (TEM), Energy dispersive X-ray spectroscopy (EDX), and superconducting quantum interference device (SQUID) magnetometry. Additionally, the results of an initial evaluation of the suitability of Feraheme for MFH applications are described, and the data indicate the particles possess promising properties for this application. 相似文献
12.
张秀敏 《精细与专用化学品》2012,20(11):8-14
作为一类在航空、机械、电子、汽车、生物医疗等领域均有着广泛应用前景的新型材料——磁性流体近年来受到了国内外的广泛重视,成为磁性材料研究领域内的热点课题之一,并且逐步发展成为一类新兴产业。综述了磁性流体及其关键材料的产业化发展历程、现状以及未来的发展趋势,着重介绍了磁性流体及其关键材料磁性纳米粒子的产业发展情况,对磁性流体产业的未来发展前景进行了展望。 相似文献
13.
14.
In this work, hollow magnetic silica microspheres (HMS) were synthesized by the template method, polyethylene glycol (PEG) and poly(lactic acid) (PLA)‐grafted hollow magnetic microspheres HMS@PLA–PEG were successfully prepared through ring‐opening polymerization method. Ioversol was loaded into HMS@PLA–PEG by physical coating, and the drug loading content was up to 39.4%. It also exhibited a slower and steady release than HMS and the cumulative release was up to 55.1% at physiological pH, which implied the PLA–PEG could prolong the circulation time. Meanwhile, to improve the efficiency of contrast, we have developed composite microspheres encapsulating superparamagnetic iron oxide (Fe3O4) as magnetic target for increasing the local concentration of the contrast media and expecting to put magnetic resonance imaging (MRI) and computed tomography (CT) technology together to apply in medical applications. Furthermore, the cytotoxicity assay in vitro was also investigated. The results revealed the ioversol‐loaded HMS@PLA–PEG exhibited low toxicity at a higher concentration, even it is up to 400 μg/mL. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44914. 相似文献
15.
16.
Yulei Tai Li Wang Guangqing Yan Jin‐min Gao Haojie Yu Lei Zhang 《Polymer International》2011,60(7):976-994
Magnetic nanospheres have numerous applications in biomedicine, biotechnology and wastewater treatment, due to their high surface area, tunable sphere size and superparamagnetic properties. Magnetic nanoparticles can be designed and endowed with optical, electronic and fluorescent properties, allowing a wide range of functionality. Multifunctional magnetic particles with heterodimer structures allow various kinds of target molecules to be attached onto their specific parts via affinity or coordinate bonding, etc. The abilities of these nanodevices, including the encapsulation of target molecules in magnetic hybrid nanostructures and easy magnetic separation in the presence of external magnetic fields, show much promise for magnetic imaging, magnetic separation and drug delivery. Consequently, magnetic particles offer excellent potential future uses in disease diagnosis, hyperthermia, immunoassays, electrochemical biosensors, contaminated water treatment and optical detection. In this article, we review the preparation and application of inorganic and organic magnetic composite spheres in the fields of magnetic separation, drug delivery, hyperthermia, magnetic resonance imaging, and others. The size, specific surface area, structure, magnetic properties and surface functional groups of nanospheres have a great influence on their effectiveness in these applications. The encapsulation of target molecules in magnetic hybrid nanostructures and their easy separation using an external magnetic field show promise for the fabrication of novel nanodevices for many applications. Copyright © 2011 Society of Chemical Industry 相似文献
17.
In this work, a facile solvothermal synthesis of MnFe2O4 nanoparticles is followed by an easy and reproducible process to envelop the synthesized MnFe2O4 nanoparticles with iron oxide nanoparticles using ethanol and ethylene glycol as solvents. All prepared MnFe2O4 nanoparticles show a homogenous distribution of spherical particles with an average particle size between 12 and 16 nm. The encapsulation process of MnFe2O4 nanoparticles does not affect their homogenous distribution with a very thin layer of Fe3O4 on the shell structure. The magnetic properties showed a superparamagnetic character with enhanced magnetic properties of MnFe2O4@Fe3O4 compared to pure MnFe2O4, which has been verified by magnetization and electron spin resonance. The heating efficiency of the prepared samples was evaluated in terms of the specific loss power using the calorimetric method. The synthesized MnFe2O4 nanoparticles show a significantly high value of about 72 W/g, which got doubled in the core@shell structure and reached 140 W/g at 189 kHz and 10kA/m of the magnetic field. 相似文献
18.
19.
磁性靶向制剂具有制备工艺简单,可提高药效,降低毒副反应,定向给药,提高生物利用度及药物稳定性等优点,目前国内外此类制剂成为研究热点。通过查阅文献资料,进行系统的分析、归纳,对磁性靶向制剂的组成、特点进行探讨,主要从目前磁性靶向制剂研究的三个方向:磁性微球、纳米微粒、磁性脂质体入手,对磁性靶向制剂的研究进展进行综述。 相似文献
20.
采用化学共沉淀方法制备Fe_3O_4磁性粒子,并使用油酸和十一烯酸对其进行表面改性,然后采用一步细乳液聚合法制备含有羧基官能团的Fe_3O_4/P(St/ACPA)磁性高分子纳米球,对磁流体和磁性高分子纳米球进行性能表征。结果表明,改性的Fe_3O_4磁流体分散性好,粒径均一,在室温下呈超顺磁性,磁含量为68.5%(w),饱和磁化强度为51.3emu/g;Fe_3O_4/P(St/ACPA)磁性高分子纳米球成球性好,粒径为70 nm,磁含量为39%(w),饱和磁化强度为27.9 emu/g。 相似文献