共查询到20条相似文献,搜索用时 15 毫秒
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H. Kavas M. Günay A. Baykal M. S. Toprak H. Sozeri B. Aktaş 《Journal of Inorganic and Organometallic Polymers and Materials》2013,23(2):306-314
Polyaniline–Fe3O4 nanocomposite with and without ionic liquid were successfully synthesized via in situ polymerization using cetyl trimethylammonium bromide (CTAB) as surfactant. Both TG analysis and FT-IR measurements proved the presence of organic layer on the surface of Fe3O4 nanoparticles. The influence of 1-butyl-3-methyl-imidazolium bromide (BMIMBr) as ionic liquid on the structure, conductivity, and magnetic property of PANI–Fe3O4–CTAB nanocomposite were studied in detail. The results show that imidazolium-based ionic liquids BMIMBr acts as an anchor agent during the formation of PANI–Fe3O4–CTAB nanocomposite. Ionic liquid significantly deteriorated nanocomposite’s magnetic properties, and contributed to non-saturated M–H curve due to the disappearance of antiferromagnetic interactions. It has also an improving effect on AC and DC conductivities. The most important effect of IL is observed in real part of permittivity of PANI–Fe3O4–CTAB that it has negative high values at low frequency low temperature region. Due to the negative dielectric constant, material exhibits uncommon properties in electromagnetic waves scattering and attraction between similar charges. This possibility provokes research on these composites as high T superconductors, negative index materials and microwave absorbers. 相似文献
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Huachang Chen Mingjie Dong Yiya Li Juan Kong Zhihua Chai Guoqi Fu 《Reactive and Functional Polymers》2013,73(1):18-22
Fe3O4@polydivinylbenzene (PDVB) submicrospheres were prepared via distillation–precipitation polymerization of DVB in the presence of submicron magnetite colloid nanocrystal clusters (MCNCs) as seeds. The surface of the MCNCs was modified with vinyl groups before PDVB encapsulation. The resulting Fe3O4@PDVB particles showed a well-defined core–shell structure, and the shell thickness could be readily controlled by the DVB dosage. A lowly cross-linked poly(methacrylic acid) (PMAA) layer could be further coated onto the highly cross-linked PDVB shell via a second-stage DPP process, suggesting the presence of residual vinyl groups on the surface of the Fe3O4@PDVB particles. The hybrid particles showed rather high magnetization and near superparamagnetism, hence capable of easy magnetic separation. 相似文献
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采用乳液共凝法制备纳米Fe3O4/天然橡胶(NR)复合材料,所用纳米Fe3O4是用化学共沉淀法制备的纳米Fe3O4乳液。研究了纳米Fe3O4用量对纳米Fe3O4/NR复合材料的力学性能、热稳定性、加工性能的影响。结果表明:纳米Fe3O4的用量对纳米Fe3O4/NR复合材料的性能有较大的影响。在NR中加入纳米Fe3O4,混炼胶的G′较高,tanδ较小,提高了复合材料的力学性能和热稳定性。当纳米Fe3O4的质量分数为15%时,纳米Fe3O4/NR复合材料的综合性能较好。 相似文献
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磁性四氧化三铁(Fe_3O_4)纳米粒子以其比表面积大、低毒性和良好的生物相容性等物理化学性质而得到广泛关注。采用共沉淀法制备磁性四氧化三铁(Fe_3O_4)纳米粒子,并通过单因素实验优化制备工艺。结果表明,制备Fe_3O_4纳米粒子的优化工艺参数为:Fe~(2+)与Fe~(3+)浓度比为1.00∶1.50、铁盐浓度为0.30 mol·L~(-1)、反应温度为60℃、 NaOH溶液的浓度为0.25 mol·L~(-1)。该条件下,Fe_3O_4纳米粒子形貌为球形,平均粒径为65.15 nm,饱和磁强度为63.5 emu·g~(-1)。 相似文献
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Fe3O4@SiO2的表面改性 总被引:1,自引:0,他引:1
采用溶胶凝胶法在磁性Fe3O4纳米粒子的表面包覆SiO2,采用正交试验法,以表面Si-OH含量为指标,考察温度、时间和醇/水三因素对表面Si-OH含量的影响,利用X射线光电子能谱分析(XPS)测试Fe3O4@SiO2复合粒子表面Si-OH含量,结果表明在80%、回流时间为1h、醇/水为6∶1是改性Fe3O4@SiO2的... 相似文献
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《Ceramics International》2015,41(8):9801-9805
In-situ nanostructured Fe(AlCr)2O4-based composite coating (FACr52.5 coating) was prepared by reactive plasma spraying with micro-sized Al–Fe2O3–Cr2O3 powders. The microstructure, toughness and Vickers hardness, and adhesive strength of the coating were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and mechanical tests. The results indicated that the interlamellar spacing of the FACr52.5 coating is only 1 μm. The coating exhibited nanostructured microstructure. The in-situ Cr (20 nm) and Fe (50–200 nm) particles were uniformly distributed in an Fe(AlCr)2O4 matrix, while the grain size of the Fe(AlCr)2O4 matrix is about 60 nm. The FACr52.5 composite nano-coating exhibited much higher hardness, better wear resistance, stronger adhesive strength and toughness as compared to those of the composite nano-coating sprayed with Fe2O3–Al powders. Excellent mechanical properties of the FACr52.5 coating were attributed to the uniform distribution of the in-situ nano-sized Cr particles in the coating matrix. 相似文献
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胡大为 《合成材料老化与应用》2021,50(1):88-90
该研究采用外磁场辅助氧化共沉淀法制备纳米Fe3O4颗粒,为优化反应器空间磁场分布,通过Ansys磁分析工具,优化设计反应器尺寸,使得反应器内部空间磁场分布均匀;通过调整操作参数,制备得到了具有六方片状、正八面体和无规则形貌的纳米Fe3O4颗粒. 相似文献
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将磁性基质Fe3O4与Al2O3进行结合制备了Fe3O4-Al2O3磁性固体酸,将其作为乳酸丁酯合成的催化剂,对于乳酸丁酯合成工艺条件进行了研究,结果表明适宜的制备条件为:焙烧温度为550℃,n(Al2O3):n(Fe3O4)=4,焙烧时间为4h,酯化反应时间为3h,醇酸比为3,催化剂的用量为0.20g.该固体酸有良好的回收和重复使用性能,红外分析表明在固体酸中Fe3O4与Al2O3发生了紧密地结合,产物为乳酸丁酯,比表面积测试表明磁性固体酸中的Fe3O4抑制.Al2O3晶粒的增长,使A12 O3粒度变小. 相似文献
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研究了以目前国内生产的Fe3O4为芯子,经过活化、包覆及稳定化处理,制备录音、录像带用钴改性Fe3O4磁粉的工艺过程,获得了较适宜的工艺路线及参数,探讨了Co2+、Fe2+、碱土金属等物质对磁性能的影响。 相似文献
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通过化学共沉淀法制备了纳米Fe3O4粉体,研究了反应物配比和反应温度对磁性粒子的物相以及磁性能的影响,优化了合成工艺。通过对二元参数的选择和严格控制,可以制备出磁化率高、粒径分布相对较好的球形磁性颗粒,干燥后获得纳米磁性粉体。 相似文献
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用共沉淀法制备Fe3O4磁流体,总结出用十二烷基磺酸钠与聚乙二醇作为表面活性剂制备水基磁流体的合适条件:(1)反应温度为室温或不高于35℃;(2)表面活性剂十二烷基磺酸钠的最佳用量为0.0030~0.0040 g/80 mL;(3)第一次包裹的最佳pH为9~10;(4)聚乙二醇作为第二次包裹的表面活剂时,体系最佳温度为40℃左右;(5)表面活性剂聚乙二醇的最佳用量为0.0050~0.0060 g/80 mL。通过实验制得了能稳定存在180 d的水基磁流体。并用透射电镜、红外光谱、分光光度计、古埃磁天平等进行了初步表征。 相似文献
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