首页> 外文学位 >Template-Assisted Fabrication of Ferromagnetic Nanomaterials
【24h】

Template-Assisted Fabrication of Ferromagnetic Nanomaterials

机译:铁磁纳米材料的模板辅助制备

获取原文
获取原文并翻译 | 示例

摘要

Template assisted deposition was used to produce various nanomaterials including simple nanowires, nanorods, multi-segmented metal nanowires, core-shell nanowires, alloy and polymer wires and tubes. Anodized aluminum oxide (AAO) membranes were used as templates for the growth of the various structures using an electrochemical deposition method and also by wetting the porous templates. In the electrochemical deposition method, the pore size of the templates affects the rate of synthesis and the structures of the nanomaterials while in the wetting method, the viscosity and reaction time in the polymer solution influence the structures of the nanomaterials.;A conventional two-step anodization procedure was used to synthesize thick AAO templates with porous hexagonal channels at a constant applied voltage and temperature. A maximum thickness of over 180 mum oxide layer could be fabricated using mild anodization at 60 V and 80 V. Compared to conventional mild anodization, these conditions facilitated faster growth of oxide layers with regular pore arrangement.;Polyethylene glycol (PEG) containing ferromagnetic nanowires were synthesized using template assisted electrochemical deposition method. During the synthesis, simultaneous deposition of polymer and metal ions resulted nanowires coated with a uniform layer of PEG without interfering with the structure and magnetic properties of the nanowires.;PEG-coated Ni nanowires were embedded in polyethylene diacrylate (PEGDA) matrix after the removal of the AAO templates. Comparison of results with and without a magnetic field during embedding showed that the presence of magnetic field supported embedding of nanowire arrays in polymer.;Influence of using AAO templates with several pore diameters for the synthesis of bimetallic nanowires were studied by growing Ni-Fe and Ni-Co bi-metallic nanowires. At a constant applied current by using templates with a pore diameters of 60 nm alloy formed while with a pore diameter of 130 nm core-shell nanowires formed.;Polyvinylidene fluoride (PVDF) films and nanotubes were synthesized using a solution recrystallization method that favored the formation of piezoelectric beta phase thin films. Variation in the concentration of polymer in the mixture solution allowed synthesis of different types of structures such as PVDF composites, nanorods and nanocrystals with tunable morphologies.
机译:模板辅助沉积用于生产各种纳米材料,包括简单的纳米线,纳米棒,多段金属纳米线,核-壳纳米线,合金和聚合物线和管。阳极氧化铝(AAO)膜用作模板,用于通过电化学沉积方法以及通过润湿多孔模板来生长各种结构。在电化学沉积方法中,模板的孔径会影响纳米材料的合成速率和结构,而在润湿方法中,聚合物溶液中的粘度和反应时间会影响纳米材料的结构。在恒定的施加电压和温度下,采用分步阳极氧化工艺合成具有多孔六角形通道的厚AAO模板。使用60 V和80 V的轻度阳极氧化可以制造超过180微米的氧化层最大厚度。与常规轻度阳极氧化相比,这些条件有助于以规则的孔排列更快地生长氧化物层。;含聚乙二醇(PEG)的铁磁纳米线用模板辅助电化学沉积法合成了这些化合物。在合成过程中,聚合物和金属离子的同时沉积导致纳米线被均匀的PEG涂层覆盖,而不会干扰纳米线的结构和磁性。。PEG包覆的Ni纳米线在去除后被嵌入到聚二丙烯酸乙二醇酯(PEGDA)基质中AAO模板。嵌入过程中有无磁场的结果比较表明,磁场的存在支持了纳米线阵列在聚合物中的嵌入。镍钴双金属纳米线。在使用恒定电流的情况下,使用形成60毫米合金孔径,形成130纳米核壳纳米线的模板。通过溶液重结晶法合成了偏二氟乙烯(PVDF)膜和纳米管,压电β相薄膜的形成。混合物溶液中聚合物浓度的变化允许合成不同类型的结构,例如具有可调形态的PVDF复合材料,纳米棒和纳米晶体。

著录项

  • 作者

    Tripathy, Jagnyaseni.;

  • 作者单位

    University of New Orleans.;

  • 授予单位 University of New Orleans.;
  • 学科 Physical chemistry.;Polymer chemistry.;Chemistry.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 118 p.
  • 总页数 118
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号