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金磁纳米材料靶向递送多西紫杉醇通过PI3K/AKT信号通路促进胃癌细胞凋亡
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作者 吴江 庞澜 +5 位作者 冷静 朱勇荷 丁永年 阿里木江·阿不都热合曼 岳跃明 吴涛 《胃肠病学和肝病学杂志》 CAS 2023年第2期170-175,共6页
目的 研究金磁纳米-多西紫杉醇递送系统对胃癌的抑制作用及其相关机制。方法 制备金磁纳米和多西紫杉醇复合材料,检测复合材料对胃癌细胞系MFC的杀伤和凋亡作用。构建MFC荷瘤小鼠并分组为:对照组、多西紫杉醇组、金磁纳米-多西紫杉醇组... 目的 研究金磁纳米-多西紫杉醇递送系统对胃癌的抑制作用及其相关机制。方法 制备金磁纳米和多西紫杉醇复合材料,检测复合材料对胃癌细胞系MFC的杀伤和凋亡作用。构建MFC荷瘤小鼠并分组为:对照组、多西紫杉醇组、金磁纳米-多西紫杉醇组,每组10只。分别经尾静脉注射PBS、多西紫杉醇、金磁纳米和多西紫杉醇复合材料。每2 d监测小鼠肿瘤体积,2周后处死小鼠,通过qRT-PCR和Western blotting检测肿瘤组织Caspase3、Caspase7、p-PI3K、p-AKT表达水平。结果 制备的复合材料粒径为(20.8±8.4)nm。金磁纳米材料和多西紫杉醇按1∶3混合达到最佳融合比,可有效抑制MFC细胞活力,促进细胞凋亡。与对照组相比,多西紫杉醇组小鼠肿瘤体积缩小,Caspase3、Caspase7表达水平升高,p-PI3K、p-AKT表达水平降低。与多西紫杉醇组相比,金磁纳米-多西紫杉醇组小鼠肿瘤体积缩小,Caspase3、Caspase7表达水平升高,p-PI3K、p-AKT表达水平显著降低。结论 金磁纳米-多西紫杉醇可通过抑制PI3K/AKT信号通路诱导胃癌细胞凋亡,抑制肿瘤生长。 展开更多
关键词 磁纳米材料 多西紫杉醇 胃癌 细胞凋亡
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基于磁纳米材料的磁热疗抗肿瘤研究进展
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作者 夏锦丹 吴稚冰 蓝开平 《中华放射肿瘤学杂志》 CSCD 北大核心 2023年第2期164-168,共5页
肿瘤热疗是继手术、放化疗、靶向治疗等治疗之后又一重要的肿瘤治疗手段。磁热治疗(MH)是一种新兴的热疗方法,因具有无创/微创性、高效性和良好的组织穿透性等优点而受到广泛关注,为恶性肿瘤实现高效、低不良反应精准医疗分子水平治疗... 肿瘤热疗是继手术、放化疗、靶向治疗等治疗之后又一重要的肿瘤治疗手段。磁热治疗(MH)是一种新兴的热疗方法,因具有无创/微创性、高效性和良好的组织穿透性等优点而受到广泛关注,为恶性肿瘤实现高效、低不良反应精准医疗分子水平治疗提供了新手段,成为目前肿瘤治疗新的研究方向。实现MH需要磁性材料和适宜磁场,其中氧化铁纳米颗粒(IONs)由于其较高的生物相容性和加热能力而被广泛研究为MH剂。本文就磁性纳米氧化铁材料的研究进展及目前基于磁性纳米颗粒的磁性热疗协同抗肿瘤治疗的研究进展进行分析,综述磁热治疗这一前沿技术在肿瘤治疗中的潜在应用。 展开更多
关键词 磁纳米材料 热疗法 肿瘤治疗 协同治疗
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多功能光-磁复合纳米材料制备及其在柑橘农残检测中的应用
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作者 李泓霖 郭婷 +4 位作者 周莹 周鸿媛 张宇昊 廖洪波 马良 《食品工业科技》 CAS 北大核心 2023年第21期337-347,共11页
为构建一种稳定、结构可控的光-磁复合材料并将其用于农药残留检测当中,本实验采用高温溶剂热法制备上转换纳米材料(Upconversion Nanoparticles,UCNPs),研究温度、转速对UCNPs的影响,实现UCNPs的可控制备。采用反相微乳液法制备三种不... 为构建一种稳定、结构可控的光-磁复合材料并将其用于农药残留检测当中,本实验采用高温溶剂热法制备上转换纳米材料(Upconversion Nanoparticles,UCNPs),研究温度、转速对UCNPs的影响,实现UCNPs的可控制备。采用反相微乳液法制备三种不同结构的多功能光-磁复合纳米材料,借助扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)、振动样品磁强计(VSM)等方法研究多功能纳米材料的形貌、结构等性能。此外,利用此复合纳米材料研究柑橘中各类型农药的响应情况。实验结果表明,温度对UCNPs粒径大小起着决定性的作用。在不同结构的UCNPs-Fe_(3)O_(4)复合材料中,A结构(UCNPs材料粒径更大的卫星结构)的荧光特性更强;B结构(两种原材料粒径相近的交织结构)在室温下同时具有20.5 emu·g^(-1)的饱和磁化强度和较高的荧光强度,性能平衡;C结构(Fe_(3)O_(4)材料粒径更大的卫星结构)的磁性最佳。同时,该复合材料对柑橘中菊酯类农药、新烟碱类农药、氨基甲酸酯类农药、有机磷农药均有一定响应,对菊酯类农药的响应最强,可用于开发菊酯类农药生物传感器。本研究采用简单普适的合成方法,为其他复合材料合成研究提供一定的理论思路,该材料有较佳的光-磁特性和生物相容性,在药物递送、成像等领域都有较大的应用潜力。 展开更多
关键词 上转换 荧光特性 光-复合纳米材料 农残检测
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稀土永磁纳米材料的控制合成及其磁学性能 被引量:11
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作者 朱凯 侯仰龙 《稀有金属》 EI CAS CSCD 北大核心 2017年第5期466-474,共9页
随着现代器件小型化和集约化的要求,对传统稀土永磁材料提出了更高的要求,包括高磁能积、高饱和磁感应强度等,而纳米技术的发展为实现该要求提供了途径。近年来,交换耦合效应为新一代综合磁性能优异的稀土永磁纳米材料的制备提供了新的... 随着现代器件小型化和集约化的要求,对传统稀土永磁材料提出了更高的要求,包括高磁能积、高饱和磁感应强度等,而纳米技术的发展为实现该要求提供了途径。近年来,交换耦合效应为新一代综合磁性能优异的稀土永磁纳米材料的制备提供了新的思路。主要介绍了稀土永磁纳米材料的合成方法,主要包括液相化学法和其他一些常用的制备方法,比较了不同材料的磁学性能,总结了稀土永磁材料的最新进展和存在的挑战,同时展望了其未来的发展方向。 展开更多
关键词 稀土永磁纳米材料 化学合成 物理制备 学性能
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磁纳米材料在环境污染物分析与去除研究中的应用 被引量:6
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作者 柳晶鑫 翟诗曼 +2 位作者 徐江艳 卢爱民 蒋红梅 《分析试验室》 CAS CSCD 北大核心 2020年第11期1241-1253,共13页
水体中的污染物对环境和人类健康影响极大,发展可靠的检测方法和高效的去除手段对污染物的监控与治理具有重大意义。在诸多分离富集技术中,基于固相材料的吸附法因具有高效、操作简单、成本低廉、可回收利用等特点,在环境污染治理研究... 水体中的污染物对环境和人类健康影响极大,发展可靠的检测方法和高效的去除手段对污染物的监控与治理具有重大意义。在诸多分离富集技术中,基于固相材料的吸附法因具有高效、操作简单、成本低廉、可回收利用等特点,在环境污染治理研究中备受关注。固相萃取法则因具有富集倍数高、柱材料可重复利用以及试剂消耗小等优点,在污染物痕量分析中得到了广泛的应用。吸附法与固相萃取法的关键都在于选择高效的吸附材料。在众多吸附材料中,磁性纳米材料以其比表面积大、吸附性能好以及可快速固液分离等优点成为最热门的材料之一。本文通过对近5年的文献调查,综述了磁性纳米材料的不同制备方法、改性及其在污染物分析与去除中的应用现状,总结并展望了磁性纳米材料的发展前景,并提出了该研究中的一些需要改进的地方。 展开更多
关键词 磁纳米材料 固相萃取 吸附 污染物分析与去除
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磁响应型胡敏酸纳米材料的制备及其对Cu(Ⅱ)的吸附性能 被引量:1
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作者 周敏茹 姚培 +3 位作者 张启蒙 李树白 刘媛 夏守鑫 《化工进展》 EI CAS CSCD 北大核心 2020年第3期1145-1152,共8页
为了扩大胡敏酸的应用范围,采用共沉淀法制备了磁响应型胡敏酸纳米材料(MHA)。通过FTIR、XRD、BET、VSM等对其结构进行表征,并研究了Cu(Ⅱ)在MHA上的吸附行为。其吸附等温线符合Langmuir吸附模型,显示单层吸附。吸附动力学满足伪二阶吸... 为了扩大胡敏酸的应用范围,采用共沉淀法制备了磁响应型胡敏酸纳米材料(MHA)。通过FTIR、XRD、BET、VSM等对其结构进行表征,并研究了Cu(Ⅱ)在MHA上的吸附行为。其吸附等温线符合Langmuir吸附模型,显示单层吸附。吸附动力学满足伪二阶吸附动力学模型,以化学吸附为主。吸附热力学表明此吸附在25~55℃下是自发过程。结果表明,MHA是一种高效、可持续的Cu(Ⅱ)吸附剂。该研究为生物质吸附剂的设计提供了一条新的思路。 展开更多
关键词 响应型胡敏酸纳米材料 表征 吸附等温线 吸附动力学 吸附热力学
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磁响应纳米材料在骨组织工程中的应用
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作者 苏之文 吴德光 +2 位作者 李东泰 吴友辉(综述) 于博(审校) 《中国临床新医学》 2022年第6期557-562,共6页
生物材料作为骨组织替代物为治疗骨缺损或骨折不愈合提供了新的思路。传统纳米材料具有损伤细胞黏附、细胞毒性强等缺点。制备高效、毒性低的生物材料成为了目前组织工程领域的研究热点。磁性纳米粒子为骨再生提供磁力刺激,电磁场作为... 生物材料作为骨组织替代物为治疗骨缺损或骨折不愈合提供了新的思路。传统纳米材料具有损伤细胞黏附、细胞毒性强等缺点。制备高效、毒性低的生物材料成为了目前组织工程领域的研究热点。磁性纳米粒子为骨再生提供磁力刺激,电磁场作为一种非侵入性物理疗法促进骨修复,两者结合制备的磁响应纳米材料在生物医学领域得到了广泛的研究和应用。该文对磁响应纳米材料的制备、分类及在骨组织工程中的应用作一综述。 展开更多
关键词 纳米粒子 响应纳米材料 骨缺损 骨再生 骨组织工程
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磁热疗法联合放射治疗增敏机制及应用的研究进展
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作者 陈宏伟 夏锦丹 沈伟敏 《中国现代医生》 2023年第15期106-108,112,共4页
肿瘤热疗是肿瘤治疗的重要手段。纳米颗粒热疗法作为一种新兴的热疗方法,因其具有无创(或微创)、高效性及良好的组织穿透性等优点而备受关注,是当前肿瘤治疗的研究方向之一。热疗法可显著提高放射治疗的效果。本文综述热疗对放射治疗的... 肿瘤热疗是肿瘤治疗的重要手段。纳米颗粒热疗法作为一种新兴的热疗方法,因其具有无创(或微创)、高效性及良好的组织穿透性等优点而备受关注,是当前肿瘤治疗的研究方向之一。热疗法可显著提高放射治疗的效果。本文综述热疗对放射治疗的增敏机制,阐述基于磁性纳米颗粒的磁热疗法联合放射治疗的研究进展,为磁热疗法在肿瘤治疗中的临床应用提供理论依据。 展开更多
关键词 热疗法 放射治疗 热疗法 磁纳米材料
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Research progress of permanent ferrite magnet materials
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作者 XU Bin CHEN Yu-feng +3 位作者 ZHOU Yu-juan LUO Bi-yun ZHONG Shou-guo LIU Xing-ao 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第6期1723-1762,共40页
Permanent ferrite magnet materials are extensively employed due to their exceptional magnetic properties and cost-effectiveness.The fast development in electromobile and household appliance industries contributes to a... Permanent ferrite magnet materials are extensively employed due to their exceptional magnetic properties and cost-effectiveness.The fast development in electromobile and household appliance industries contributes to a new progress in permanent ferrite materials.This paper reviews the deveolpement and progress of permanent ferrite magnet industry in recent years.The emergence of new raw material,the advancement of perparation methods and manufacturing techniques,and the potential applications of permanent ferrite materials are introduced and discussed.Specifically,nanocrystallization plays a crucial role in achieving high performance at a low cost and reducing reliance on rare earth resources,and therefore it could be a promising development trendency. 展开更多
关键词 permanent ferrite magnetic materials HIGH-PERFORMANCE nanosizing
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磁纳米分子影像探针研究热点与挑战 被引量:2
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作者 楚成超 刘刚 《科技导报》 CAS CSCD 北大核心 2018年第22期87-95,共9页
近年来,磁纳米材料在分子影像领域的应用得到科研人员的广泛关注。常用的磁性纳米探针是超顺磁性氧化铁颗粒(SPION),它具有较好的水质子横向弛豫时间(T2)弥散加权核磁共振成像造影剂的性能。通过对SPION制备及表面修饰进行改进,使纳米... 近年来,磁纳米材料在分子影像领域的应用得到科研人员的广泛关注。常用的磁性纳米探针是超顺磁性氧化铁颗粒(SPION),它具有较好的水质子横向弛豫时间(T2)弥散加权核磁共振成像造影剂的性能。通过对SPION制备及表面修饰进行改进,使纳米颗粒具有磁共振造影功能和干细胞标记、药物/基因递送的功能。综述了SPION兼具影像探针和磁共振成像可视化治疗方面的功能。虽然已有多种磁纳米材料进入临床研究,但结合当前研究瓶颈以及纳米药物制备方法的发展,制备造影效果较好、药物生物相容性较高、具有靶向性及临床转换潜力较强的SPION是新一代磁纳米探针研究亟需解决的问题。 展开更多
关键词 磁纳米材料 共振成像 分子探针 诊疗一体化
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Structure and Magnetism of Co-implanted TiO2
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作者 丁斌峰 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2011年第6期724-728,I0004,共6页
Crystalline Co nanocomposites in the rutile TiO2 were synthesized by 180 keV Co ion beam implantation at temperature of 623 K with the fluence of 4×10^16 cm^-2. The structural and magnetic properties of samples w... Crystalline Co nanocomposites in the rutile TiO2 were synthesized by 180 keV Co ion beam implantation at temperature of 623 K with the fluence of 4×10^16 cm^-2. The structural and magnetic properties of samples with different thermal treatment were characterized by synchrotron radiation X-ray diffraction (SR-XRD), high resolution transmission electron mi- croscopy (HRTEM), Rutherford backscattering/channeling and the superconducting quantum interference device magnetometer. The SR-XRD results reveal the formation of hcp and fce phases of Co clusters, and the SR-XRD and HRTEM show that Co nanocrystals (NCs) have been formed in TiO2 after ion implantation. With increasing of annealing temperature, the transition of hcp to fcc Co is observed, and the Co NCs sizes were increased with increasing post-annealing temperature. At annealing temperature 1073 K, the lattice damaged is significantly removed compared with the virgin sample. The Co NCs forming inside TiO2 are the major contribution of the measured ferromagnetism. 展开更多
关键词 NANOCOMPOSITE Ferromagnetic material Ion implantation
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Absorption performance of DMSA modified Fe_3O_4@SiO_2 core/shell magnetic nanocomposite for Pb^(2+) removal 被引量:7
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作者 TIAN Qing-hua WANG Xiao-yang +1 位作者 MAO Fang-fang GUO Xue-yi 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第4期709-718,共10页
The purpose of this study is to explore the adsorption performance of meso-2,3-dimercaptosuccinic acid(DMSA)modified Fe3O4@SiO2 magnetic nanocomposite(Fe3O4@SiO2@DMSA)for Pb2+ions removal from aqueous solutions.The ef... The purpose of this study is to explore the adsorption performance of meso-2,3-dimercaptosuccinic acid(DMSA)modified Fe3O4@SiO2 magnetic nanocomposite(Fe3O4@SiO2@DMSA)for Pb2+ions removal from aqueous solutions.The effects of solution pH,initial concentration of Pb2+ions,contact time,and temperature on the amount of Pb2+adsorbed were investigated.Adsorption isotherms,adsorption kinetics,and thermodynamic analysis were also studied.The results showed that the maximum adsorption capacity of the Fe3O4@SiO2@DMSA composite is 50.5 mg/g at 298 K,which is higher than that of Fe3O4 and Fe3O4@SiO2 magnetic nanoparticles.The adsorption process agreed well with Langmuir adsorption isotherm models and pseudo second-order kinetics.The thermodynamic analysis revealed that the adsorption was spontaneous,endothermic and energetically driven in nature. 展开更多
关键词 lead removal ADSORPTION Fe3O4@SiO2 core/shell structure DMSA modification magnetic nanocomposite
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Characteristics of magnetic Fe_3O_4 nanoparticles encapsulated with human serum albumin 被引量:2
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作者 何捍卫 刘红江 +2 位作者 周科朝 王维 容鹏飞 《Journal of Central South University of Technology》 EI 2006年第1期6-11,共6页
Magnetic nanoparticles (Fe304) were prepared by chemical precipitation method using Fe^2+ and Fe^3+ salts with sodium hydroxide in the nitrogen atmosphere. Fe3O4 nanoparticles were coated with human serum albumin... Magnetic nanoparticles (Fe304) were prepared by chemical precipitation method using Fe^2+ and Fe^3+ salts with sodium hydroxide in the nitrogen atmosphere. Fe3O4 nanoparticles were coated with human serum albumin(HSA) for magnetic resonance imaging as contrast agent. Characteristics of magnetic particles coated or uncoated were carried out using scanning electron microscopy and X-ray diffraction. Zeta potentials, package effects and distributions of colloid particles were measured to confirm the attachment of HSA on magnetic particles. Effects of Fe3O4 nanoparticles coated with HSA on magnetic resonance imaging were investigated with rats. The experimental results show that the adsorption of HSA on magnetic particles is very favorable to dispersing of magnetic Fe3O4 particles, while the sizes of Fe3O4 particles coated are related to the molar ratio of Fe3O4 to HSA. The diameters of the majority of particles coated are less than 100 nm. Fe3O4 nanoparticle coated with HSA has a good biocompatibility and low toxicity. This new contrast agent has some effects on the nuclear magnetic resonance imaging of liver and the lowest dosage is 20μmol/kg for the demands of diagnosis. 展开更多
关键词 Fe3O4 nanoparticle human serum albumin chemical precipitation method magnetic resonance imaging contrast agent
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Growth of High Magnetic a-Fe2O3 and Fe3O4 Nanowires via an Oxide Assisted Vapor-Solid Process
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作者 章明 许乃锋 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2011年第1期109-114,I0004,共7页
We describes a controllable synthesis procedure for growing a-Ee2O3 and Ee3O4 nanowires. High magnetic hematite a-Fe2O3 nanowires are successfully grown on Fe0.5Ni0.5 alloy substrates via an oxide assisted vapor-solid... We describes a controllable synthesis procedure for growing a-Ee2O3 and Ee3O4 nanowires. High magnetic hematite a-Fe2O3 nanowires are successfully grown on Fe0.5Ni0.5 alloy substrates via an oxide assisted vapor-solid process. Experimental results also indicate that previous immersion of the substrates in a solution of oxalic acid causes the grown nanowires to convert gradually into magnetite (Fe3O4) nanowires. Additionally, the saturated state of Fe3O4 nanowires is achieved as the oxalic acid concentration reaches 0.75 mol/L. The average diameter and length of nanowires expands with an increasing operation temperature and the growth density of nanowires accumulates with an increasing gas flux in the vapor-solid process. The growth mechanism of a-Fe2O3 and Fe3O4 nanowires is also discussed. The results demonstrate that the entire synthesis of nanowires can be completed within 2 h. 展开更多
关键词 Oxide assisted vapor-solid process Fe3O4 NWs a-Fe2O3 NWs Oxalic acid Magnetic material
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Electronic Resonant Splitting in a Nanostructure with Periodic Magnetic-Electric Barriers
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作者 LU Jian-Duo 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第3期783-785,共3页
In this letter, the transmission probability and the conductance of the ballistic electron are studied in a nanostructure with the periodic magnetic-electric barriers. We find that the resonant splitting increases wit... In this letter, the transmission probability and the conductance of the ballistic electron are studied in a nanostructure with the periodic magnetic-electric barriers. We find that the resonant splitting increases with the number of periods increasing, so the number of the resonant peaks increases and the peaks become sharper. For the m-th periodic magnetic-electric barriers tunneling the splitting is (m - 1)-fold. 展开更多
关键词 magnetic nanostructure resonant splitting magnetic-electronic barriers
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Some Applications of Mossbauer Spectroscopy
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作者 Jozef Sitek Katarina Sedlackova Julius Dekan 《Journal of Physical Science and Application》 2013年第5期295-300,共6页
Mossbauer spectroscopy was established as an analytical method 50 years ago and it is still of current interest in many disciplines as mineralogy, environmental science, archeology and biology. Areas of research where... Mossbauer spectroscopy was established as an analytical method 50 years ago and it is still of current interest in many disciplines as mineralogy, environmental science, archeology and biology. Areas of research where Mossbauer spectroscopy is contributing are metals and alloys, magnetic materials, chemical compounds and oxidation states, nanoparticles and many others. Different types of amorphous and nanocrystalline materials (e.g. finemet, nanoperm and hitperm) can be analyzed under different external influence like neutron irradiation or external magnetic field. Mineralogical samples as potassium white micas in sheared basement cover rocks from the Central Western Carpathians and meteorites can be also effectively investigated using MOssbauer spectroscopy. Phase analysis of meteorites can be helpful in their classification and moreover, particular magnetic and non-magnetic components can be analyzed in details. At present, the Mossbauer spectroscopy is also used to analyze environmental materials like zeolites, volcanic tephra and compounds containing ferrate (Fe6+). 展开更多
关键词 Mossbauer spectroscopy nanocrystalline materials white micas Kosice meteorite ferrate Fe6+.
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Surface Modfication of Fe_3O_4 Nanoparticles
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作者 LIU Yong-jian JIA Hong-yi ZHUANG Hong 《Journal of China University of Mining and Technology》 2006年第3期359-361,共3页
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. Fe3... 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+. 展开更多
关键词 Fe3O4 nanoparticles magnetic grain surface modification MECHANISM
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Effect of Fe_2O_3/SiO_2 ratio on maghemite-silica particulate nanocomposites
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作者 ANG Bee Chin YAACOB Iskandar Idris NURDIN Irwan 《Journal of Central South University》 SCIE EI CAS 2013年第11期2954-2959,共6页
Abstract: Maghemite-silica particulate nanocomposites were prepared by modified 2-step sol-gel process. Superparamagnetic maghemite nanoparticles were successfully produced using Massart's procedure. Nanocomposites ... Abstract: Maghemite-silica particulate nanocomposites were prepared by modified 2-step sol-gel process. Superparamagnetic maghemite nanoparticles were successfully produced using Massart's procedure. Nanocomposites consisting of synthesized maghemite nanoparticles and silica were produced by dispersing the as-synthesized maghemite nanoparticles into the silica particulate form. The system was then heated at 140 ℃for 3 d. A variety of mass ratios of Fe2O3/SiO2 was investigated. Moreover, no surfactant or other unnecessary precursor was involved. The nanocomposites were characterized using XRD, BET and AGM. The XRD diffraction patterns show the reflection corresponding to maghemite nanoparticles and a visible wide band at 20 from 20° to 35° which are the characteristics of the amorphous phase of the silica gel. The patterns also exhibit the presence of only maghemite and SiO2 amorphous phase, which indicates that there is no chemical reaction between the silica particulate gel and maghemite nanoparticles to form other compounds. The calculated crystallite size for encapsulated maghemite nanoparticles is smaller than the as-synthesized maghemite nanoparticles indicating the dissolution of the nanoparticles. Very high surface area is attained for the produced nanocomposites (360-390 m^2/g). This enhances the sensitivity and the reactivity of the nanocomposites. The shapes of the magnetization curves for nanocomposites are very similar to the as-synthesized maghemite nanoparticles. Superparamagnetic behaviour is exhibited by all samples, indicating that the size of the maghemite nanoparticles is always within the nanometre range. The increase in iron content gives rise to a small particle growth. 展开更多
关键词 maghemite nanoparticles NANOCOMPOSITES SOL-GEL SILICA
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Solution combustion synthesis of Fe-Ni-Y_2O_3 nanocomposites for magnetic application
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作者 刘烨 秦明礼 +4 位作者 章林 贾宝瑞 陈鹏起 张德志 曲选辉 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第1期23-29,共7页
Fe-Ni-Y2O3 nanocomposites with uniform distribution of fine oxide particles in the gamma Fe Ni matrix were successfully fabricated via solution combustion followed by hydrogen reduction. The morphological characterist... Fe-Ni-Y2O3 nanocomposites with uniform distribution of fine oxide particles in the gamma Fe Ni matrix were successfully fabricated via solution combustion followed by hydrogen reduction. The morphological characteristics and phase transformation of the combusted powder and the Fe-Ni-Y2O3 nanocomposites were characterized by XRD, FESEM and TEM.Porous Fe-Ni-Y2O3 nanocomposites with crystallite size below 100 nm were obtained after reduction. The morphology, phases and magnetic property of Fe-Ni-Y2O3 nanocomposites reduced at different temperatures were investigated. The Fe-Ni-Y2O3 nanocomposite reduced at 900 °C has the maximum saturation magnetization and the minimum coercivity values of 167.41 A/(m2·kg)and 3.11 k A/m, respectively. 展开更多
关键词 nanocomposite powder solution combustion synthesis soft magnetic materials magnetic properties
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Rotating magnetic field-controlled fabrication of magnetic hydrogel with spatially disk-like microstructures 被引量:6
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作者 Fengguo Fan Jianfei Sun +5 位作者 Bo Chen Yang Li Ke Hu Peng Wang Ming Ma Ning Gu 《Science China Materials》 SCIE EI CSCD 2018年第8期1112-1122,共11页
Composite biomaterials with controllable mi- crostructures play an increasingly important role in tissue engineering and regenerative medicine. Here, we report a magnetic hydrogel composite with disk-like microstructu... Composite biomaterials with controllable mi- crostructures play an increasingly important role in tissue engineering and regenerative medicine. Here, we report a magnetic hydrogel composite with disk-like microstructure fabricated by assembly of iron oxide nanopartides during the gelation process in the presence of rotating magnetic field. It should be mentioned that the iron oxide nanoparticles here were synthesized identically following techniques of Fer- umoxytol that is the only inorganic nanodrug approved by FDA for clinical applications. The microstructure of nano- particles inside the hydrogel was ordered three-dimensionally due to the twist of the aligned chains of magnetic nano- particles which leads to the lowest state of systematic energy. The size of microstructure can be tuned from several micro- meters to tens of micrometers by changing the assembly parameters. With the increase of microstructure size, the magnetothermal anisotropy was also augmented. This result confirmed that the assembly-induced anisotropy can occur even for the several micron aggregates of nanopartides. The rotating magnetic field-assisted technique is cost-effective, simple and flexible for the fabrication of composite hydrogel with ordered microstructure. We believe it will be favorable for the quick, green and intelligent fabrication of some com- posite materials. 展开更多
关键词 magnetic nanoparticles assembly rotating magnetic field hydrogel intelligent fabrication
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