Effect of Ionic Concentration on Dynamic Magnetic Susceptibility of Iron Oxide Nanoparticles Embedded in Chitosan Hydrogel Matrix

• E. Villamin M.

  Tokyo Institute of Technology, Department of Materials Science and Engineering

• Kitamoto Y.

  Tokyo Institute of Technology, Department of Materials Science and Engineering

抄録

  We investigate the effect of the ionic strength of surrounding NaCl solutions of an iron-oxide chitosan hydrogel (FeO_x-CH) on magnetic relaxation of the FeO_x NPs. The magnetic relaxation of the FeO_x NPs is examined using dynamic magnetic susceptibility measurement. Swelling ratio (SR) is also measured after the FeO_x-CH is immersed to various NaCl concentrations. SR of the FeO_x-CH decreases as the NaCl concentration increases. This trend is explained by considering the osmotic water flow in the FeO_x-CH. The peak in frequency dependence of the imaginary part of the susceptibility (χ ”) is found around 200 Hz. In addition, the position of the χ ” peak frequency shifts to lower frequencies as the NaCl concentration increases. The observed frequency shift is inferred to be due to the suppression of the Brownian relaxation caused by the decrease of SR of the FeO_x-CH as the NaCl concentrations increases. An effective viscosity change of 6.8% due to the change in the NaCl concentration is also estimated via analytical calculation.

収録刊行物

• 日本磁気学会論文特集号

  日本磁気学会論文特集号 3 (1), 113-119, 2019-05-01

  公益社団法人 日本磁気学会

キーワード

• biomagnetism
• magnetic nanoparticles
• magnetic biosensing
• chitosan ferrogel
• dynamic susceptibility

詳細情報

• CRID: 1390845713065645312
• NII論文ID: 130007641698
• DOI: 10.20819/msjtmsj.19tr322
• ISSN: 24320471
• 本文言語コード: en
• データソース種別:
  • JaLC
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可