Preparation of oxide thim films by ultra-clean ferrite plating and their magnetic properties

超净铁氧体镀覆氧化锡薄膜及其磁性能

基本信息

  • 批准号:
    09650346
  • 负责人:
  • 金额:
    $ 2.11万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    1997
  • 资助国家:
    日本
  • 起止时间:
    1997 至 1998
  • 项目状态:
    已结题

项目摘要

This report describes the ferrite plating using purified clean aqueous solutions to compress the formation of impurity particles, which are incorporated in plated films and degrade their microstructure and magnetic properties. To realize the ultra-clean solutions, 1) a reaction solution and an oxidizing one were prepared using ultrapure water and supplied through membrane filters of 0.1 mum in pore diameter, 2) an ammonia solution was supplied to keep a pH value during the reaction instead of CH_3COONH_4 that forms impurity particles by mixing with Fe^<2+> ions. Magnetite (Fe_3O_4) and Ni-Zn ferrite films were synthesized on glass substrates or polymer spheres.The polymer microspheres with ferrite coatings are used as carrier particles for enzyme immunoassay. The ferrite coatings are necessary for collecting the particles using magnetic field. Thickness of the ferrite coatings is required to be equal or less than 50 nm to obtain a good dispersion performance in water. In methods without using the clean solution technique, continuous films with such thickness were not obtained due to large grains of around 100 nm, which were caused by incorporated impurity particles formed in the solution. In the new method, small grains of 10-20 nm were observed in the initial stage. When the layer thickness was 50 nm, the polymer particles were fully encapsulated with ferrite coatings, which have smooth surface and were composed of uniform and small grains. Mossbauer spectra showed that the coatings are composed of magnetite. The saturation magnetization was almost the same as the bulk value. The particles coated with 50 nm-thick magnetite exhibited the excellent dispersion performance in water and efficiency of magnetic separation by the magnetic field of 40 Oe. These performances were superior to those of the product in the market for enzyme immunoassay.
本报告描述了铁氧体电镀使用纯化的清洁水溶液压缩杂质颗粒的形成,这些杂质颗粒被纳入镀膜中并降低其微观结构和磁性能。为了实现超净溶液,1)使用超纯水制备反应溶液和氧化溶液,并通过孔径为0.1 μ m的膜过滤器供应,2)供应氨溶液以在反应期间保持pH值,而不是通过与Fe^2+离子混合形成杂质颗粒的CH_3COONH_4。在玻璃或聚合物微球上分别制备了Fe_3O_4和Ni-Zn铁氧体薄膜,并将其作为酶免疫分析的载体颗粒。铁氧体涂层是利用磁场收集颗粒所必需的。要求铁氧体涂层的厚度等于或小于50 nm以获得在水中的良好分散性能。在不使用清洁溶液技术的方法中,由于在溶液中形成的掺入的杂质颗粒引起的约100 nm的大晶粒,不能获得具有这种厚度的连续膜。在新方法中,在初始阶段观察到10-20 nm的小晶粒。当涂层厚度为50 nm时,聚合物颗粒被铁氧体涂层完全包覆,涂层表面光滑,颗粒均匀细小。穆斯堡尔谱表明,涂层由磁铁矿组成。饱和磁化强度与体相磁化强度基本一致。在40 Oe的磁场作用下,粒径为50 nm的磁性颗粒在水中具有良好的分散性能和磁分离效率,这些性能均上级市场上的酶免疫分析产品。

项目成果

期刊论文数量(0)
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Y.Nakayama, Y.Kitamoto, et.al.: "MR Effect of Magnetite Films Prepared by Ferrite Plating" J.Materials Research. (in press). (1999)
Y.Nakayama、Y.Kitamoto 等人:“铁氧体电镀制备的磁铁矿薄膜的 MR 效应”J.Materials Research。
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    0
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M.Ojima, Y.Kitamoto, et.al.: "Ferrite Plating on Polymer Microspheres for Medical Applications" J.Materials Research. (in press). (1999)
M.Ojima、Y.Kitamoto 等人:“用于医疗应用的聚合物微球上的铁氧体电镀”J.Materials Research。
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    0
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Y.Kitamoto, S.Takaya, et.al.: "Low Temperature Fabrication of Co Ferrite Thin Films with High Coercivity for Perpendicular Recording Disks by Wet Process" J.Magn.Magn.Mater.(印刷中). (1999)
Y.Kitamoto、S.Takaya 等人:“通过湿法工艺低温制造垂直记录盘的高矫顽力钴铁氧体薄膜”J.Magn.Magn.Mater.(​​出版中)。
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    0
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Y.Nakayama, Y.Kitamoto, et.al.: "NiZn Ferrite Coating for Electrical Insulation of MnZn Ferrite Cores" J.Korean Ceramic Society. (印刷中). (1999)
Y.Nakayama、Y.Kitamoto 等人:“用于 MnZn 铁氧体磁芯电绝缘的 NiZn 铁氧体涂层”J.韩国陶瓷学会(1999 年出版)。
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    0
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Y.Nakayama, Y.Kitamoto, et al.: "MR Effect of Magnetite Films Prepared by Ferrite Plating" J.Materials Research. (印刷中). (1999)
Y.Nakayama、Y.Kitamoto 等人:“铁氧体电镀制备的磁铁矿薄膜的 MR 效应”J.Materials Research(出版中)。
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KITAMOTO Yoshitaka其他文献

KITAMOTO Yoshitaka的其他文献

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{{ truncateString('KITAMOTO Yoshitaka', 18)}}的其他基金

Nano-magnetic sensing system for biomedical devices
用于生物医学设备的纳米磁传感系统
  • 批准号:
    20310077
  • 财政年份:
    2008
  • 资助金额:
    $ 2.11万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Fabrication of magnetic nanoparticle-array recording media and their evaluation with probe heads
磁性纳米颗粒阵列记录介质的制备及其探针头的评估
  • 批准号:
    14350180
  • 财政年份:
    2002
  • 资助金额:
    $ 2.11万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Micro-patterned high-density magnetic recording media by self-assembly in solution
通过溶液自组装形成微图案高密度磁记录介质
  • 批准号:
    11650343
  • 财政年份:
    1999
  • 资助金额:
    $ 2.11万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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