Modified reverse microemulsion synthesis for iron oxide/silica core–shell colloidal particles

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• 作者：Yuan Zhu (1)
  F. Y. Jiang (2) (4)
  Kexin Chen (3)
  Feiyu Kang (3)
  Z. K. Tang (1) (2)
  
• 关键词：Nanostructures ; Sol–gel chemistry ; Electron microscopy
• 刊名：Journal of Sol-Gel Science and Technology
• 出版年：2013
• 出版时间：April 2013
• 年：2013
• 卷：66
• 期：1
• 页码：180-186
• 全文大小：470KB
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• 作者单位：Yuan Zhu (1)
  F. Y. Jiang (2) (4)
  Kexin Chen (3)
  Feiyu Kang (3)
  Z. K. Tang (1) (2)
  
  1. State Key Lab of Optoelectronic Materials and Technologies, School of Physics and Engineering, SunYat-Sen University, Guangzhou, China
  2. Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
  4. School of Environment and Materials Engineering, Yantai University, Qingquan Road, Laishan Zone, Yantai, China
  3. Department of Materials Science and Engineering, Tsinghua University, Beijing, China
  
• ISSN：1573-4846

文摘

Iron oxide/silica core–shell colloidal particles were prepared by basic reverse microemulsion (RM) method and two modified RM methods. By basic RM method, maximum particle size obtained was mere 40?nm. For building photonic crystals working in the visible range, the colloidal particles must be larger than 100?nm. Thus two modified RM methods were used. By alcohol modified RM method, short chain alcohols were used as co-surfactant. The particle size rose to near 100?nm, but the core–shell structure was comparatively poor. By emulsifier pair modified RM method, the particle size leapt to over 200?nm and a narrow growth window was found favorable to enhance the stability and rigidity of the surfactants layers. The core–shell mechanism was also discussed and a new four-step mechanism was proposed.