纳米磁流体在驱油应用中的研究进展

综述了基于磁性纳米材料所构建的纳米磁流体在提高原油采收率中的应用;总结了纳米磁流体的驱油机理,重点论述了基于氧化铁、钴铁氧体和镍铁氧体等磁性纳米材料所构建的纳米磁流体在提高原油采收率中的应用进展;最后对纳米磁流体在驱油应用中所面临的挑战和机遇进行了总结和展望。     

纳米Fe3O4磁流体的制备及其性能研究

研究了化学共沉淀法制备Fe3O4纳米磁性液体的工艺过程,采用简易的方法对所制得的磁流体进行了检测和表征.对制备磁流体过程中的影响因素作了简单的分析并采用六因素四水平的正交实验对各因素进行了优化,得到了较佳的制备工艺.反应过程中保持pH值一直处于9～10之间,铁盐浓度为0.1 mol/L,其中Fe2 /Fe3 为1∶1,表面活性剂PEG4000的加入量为0.77 g(即mFe3O4/mpEG4000=1∶1),机械搅拌速率为1 000 r/min,采用机械搅拌和超声搅拌交替进行,反应温度为60 ℃并在此温度下保温陈化30 min.XRD分析表明产物微粒达到34.5 nm,采用TEM对磁流体悬浮液进行分析发现悬浮颗粒的粒径在20～40 nm之间.     

一种极具潜力的新型化工材料——磁流体

综述了一种新型的化工材料———磁流体及其制备方法和应用前景。并对目前的磁流体技术现状进行了一些探讨。     

磁流体密封在化工设备中的应用展望

简介了在化工领域极具潜力的新型密封方式———磁流体密封,并以化工设备中常用的泵为例,对磁流体密封在化工行业的应用前景进行了展望。     

纳米磁流体

磁流体（Magnetic Liquid）是由具有铁磁性的超细固体微粒（直径为几～十几纳米）高度弥散在基液中而构成的稳定的胶体溶液。磁流体一般包含3个组分：①铁磁性纳米级颗粒;     

纳米二氧化钛的制备及其应用研究进展

纳米二氧化钛是一种新型的无机材料,具有一定的光学性质、化学稳定性、热稳定性、无毒性、超亲水性等特性。文章主要综述了纳米二氧化钛的制备方法以及其在不同领域如废水处理、化妆品、涂料、塑料制品等方面的应用。     

肿瘤治疗用磁流体研究进展

磁流体因其所具有的独特性质(流动性，磁响应性，靶向性)而应用广泛，与现代医药学相结合则更加显示出其优越性。综述了其在肿瘤治疗领域的应用研究进展。     

磁流体制备中表面活性剂的选择及其包裹条件的影响

讨论了表面活性剂对磁性颗粒的包裹以及pH值、温度、表面活性剂的用量和搅拌速度等包裹条件对磁性颗粒的影响。应用磁天平、粒度测试仪对磁性颗粒的粒径和磁化率进行了测定。结果表明,在十二烷基苯磺酸钠、油酸钠和乙二醇3种不同的表面活性剂中,选用油酸钠效果最好。当pH=5,温度为80℃,搅拌速度为200 r/min,油酸钠的用量大约为Fe2+的0.4~0.5倍时,包裹效果最好,得到的磁性颗粒小、磁性强。     

银纳米簇的制备及其应用研究进展

银纳米簇不仅具有一般金属纳米簇的性质,还具有低毒、强荧光、优异的光学稳定性以及良好的生物相融性等特性。银纳米簇在生物分析、细胞成像、环境监测以及电子器件等领域的研究及应用非常广阔。综述了银纳米簇的制备方法、银纳米簇的稳定剂制备及银纳米簇的应用。     

纳米金和磁性纳米颗粒在生物传感器中的应用

纳米技术的出现为纳米材料在分析化学领域的发展和应用开辟了新的方向。纳米材料的优异性能例如比表面积大、反应活性高等为生物检测奠定了基础。综述了纳米材料中纳米金和磁性纳米颗粒在生物传感器中的应用,并对其将来的发展进行了展望。     

金纳米粒子的研究进展

纳米科学是一个正在蓬勃发展的学科,它的发展对其他科学领域都有重要的影响,其中有一大领域的纳米粒子已经近被人们广泛研究,金纳米粒子就是其中较为典型的一个代表。它在生物标记、传感器构建、光学探针、电化学探针、组织修复、DNA、葡萄糖传感器等领域都有重要应用。     

Magnetic Particle Imaging: Current and Future Applications,Magnetic Nanoparticle Synthesis Methods and Safety Measures

Magnetic nanoparticles (MNPs) have a wide range of applications; an area of particular interest is magnetic particle imaging (MPI). MPI is an imaging modality that utilizes superparamagnetic iron oxide particles (SPIONs) as tracer particles to produce highly sensitive and specific images in a broad range of applications, including cardiovascular, neuroimaging, tumor imaging, magnetic hyperthermia and cellular tracking. While there are hurdles to overcome, including accessibility of products, and an understanding of safety and toxicity profiles, MPI has the potential to revolutionize research and clinical biomedical imaging. This review will explore a brief history of MPI, MNP synthesis methods, current and future applications, and safety concerns associated with this newly emerging imaging modality.     

热疗用葡聚糖磁流体的制备及表征

用化学共沉淀法,以不同浓度的葡聚糖40000和20000水溶液作为分散剂,制备纳米铁氧体磁流体。铁氧体粒子的平均直径为15 nm左右,其分散主要依靠空间位阻作用维持。葡聚糖磁流体中铁氧体粒子与葡聚糖以氢键、范德华力结合,葡聚糖包覆量约为8%。随葡聚糖相对分子质量和浓度的升高,磁流体(2.45%)的稳定性上升,用50%葡聚糖40000水溶液制备的磁流体,在室温静置72 h以上,没有分层现象。     

Magnetic Nanoparticle Arrays Self-Assembled on Perpendicular Magnetic Recording Media

We study magnetic-field directed self-assembly of magnetic nanoparticles onto templates recorded on perpendicular magnetic recording media, and quantify feature width and height as a function of assembly time. Feature widths are determined from Scanning Electron Microscope (SEM) images, while heights are obtained with Atomic Force Microscopy (AFM). For short assembly times, widths were ~150 nm, while heights were ~14 nm, a single nanoparticle on average with a 10:1 aspect ratio. For long assembly times, widths approach 550 nm, while the average height grows to 3 nanoparticles, ~35 nm; a 16:1 aspect ratio. We perform magnetometry on these self-assembled structures and observe the slope of the magnetic moment vs. field curve increases with time. This increase suggests magnetic nanoparticle interactions evolve from nanoparticle–nanoparticle interactions to cluster–cluster interactions as opposed to feature–feature interactions. We suggest the aspect ratio increase occurs because the magnetic field gradients are strongest near the transitions between recorded regions in perpendicular media. If these gradients can be optimized for assembly, strong potential exists for using perpendicular recording templates to assemble complex heterogeneous materials.     

Targeted Nanoparticle Photodynamic Diagnosis and Therapy of Colorectal Cancer

Colorectal cancer (CRC) is an aggressive cancer that remains a challenge to diagnose and treat. Photodynamic diagnosis (PDD) and therapy (PDT) are novel alternative techniques, which can enhance early diagnosis, as well as elicit tumor cell death. This is accomplished through photosensitizer (PS) mediated fluorescence and cytotoxic reactive oxygen species activation upon laser light irradiation excitation at specific low and high range wavelengths, respectively. However, the lack of PS target tumor tissue specificity often hampers these techniques. This study successfully fabricated a bioactive nanoconjugate, ZnPcS₄-AuNP-S-PEG5000-NH₂-Anti-GCC mAb (BNC), based upon a polyethylene glycol-gold nanoparticle, which was multi-functionalized with a fluorescent PDT metalated zinc phthalocyanine PS, and specific anti-GCC targeting antibodies, to overcome CRC PDD and PDT challenges. The BNC was found to be stable and showed selectively improved subcellular accumulation within targeted CRC for improved PDD and PDT outcomes in comparison to healthy in vitro cultured cells. Additionally, the BNC reported significantly higher late apoptotic PDT-induced CRC cell death rates (34% ***) when compared to PDT PS administration alone (15% *). These results indicated that the improved PDD and PDT outcomes were due to the specific PS accumulation in CRC cells through nanoparticle carriage and bioactive anti-GCC targeting.     

物理化学靶向制剂中磁性靶向研究进展

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。     

纳米磁性材料的制备及应用的新进展

介绍了纳米磁流体、纳米磁性颗粒、纳米磁性微晶及纳米磁性复合材料的制备方法并比较了各种方法的优缺点。并对纳米磁性材料的应用进行了概述,对其研究前景进行了展望。     

磁性液体在外施磁场下的方向性弱絮凝行为

磁性液体是一种高分子稳定胶体,实验观察发现磁性液体在外施磁场作用下,磁性颗粒沿着外磁场方向形成一定有序排列的球链簇,却又不是絮凝使胶体系统失稳,显示出与其它胶体系统的不同之处。在一般胶体系统中弱絮凝行为表现不明显,不引起重视,通过计算分析发现磁性液体在外加磁场下弱絮凝行为表现却异常明显,而且弱絮凝行为存在着方向性,又不使胶体系统失稳,与实验和实际应用相符。从而揭示了磁性液体在外施磁场作用下各向异性的机理,并且很好地解释了光波在在外施磁场作用下的磁性液体中会产生光的双折射效应等现象。     

超临界流体制备超微粉体的研究进展

超临界流体制备超微粉体是一项新技术，利用超临界流体较好的溶解、扩散和传输能力，能制备出高质量的超微粉体，根据其工艺原理可分为：超临界流体快速膨胀法（RESS），超临界流体脱溶剂法（GAS）和超临界流体微乳法，本文对RESS，GAS和超临界流体微乳法制备超微粉体的原理进行了总结，并对这3种方法在食品、医药、化工材料等领域中的研究现状进行了介绍。