Microparticles of Poly(methacrylic acid)-Gadolinium Ion Complex and Their Magnetic Force Microscopic Images

Tsuyoshi Michinobu, Norikatsu Sasao, Hiroyuki Nishide*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Modified poly(methacrylic acid) microparticles complexed with gadolinium(III) (Gd3+) ions were prepared in 100 nm. The emulsion terpolymerization of methacrylic acid, ethyl acrylate, and allyl methacrylate and the following complexation with Gd8+ ions yielded the polymer particles with different Gd3+ ion contents. Potentiometric titration of the complexation of the particle with Gd3+ ions indicated the formation of a very stable tris-carboxylate coordinate complex with the Gd 3+ ion. Electron spin resonance and IR spectra of the complexed particles were dependent on the Gd3+ ion content and the coordination environment in each particle. The microparticles dispersed on a mica substrate were subjected to atomic force microscopy (ATM), followed by magnetic force microscopy (MFM). AFM showed 100-nm-sized and monodispersed spherical images. The following MFM clearly provided strong magnetic responses exactly on the same particle positions, of which the images were also dependent on the Gd 3+ ion content in the particle. 2004 Wiley Periodicals, Inc.

Original languageEnglish
Pages (from-to)1912-1918
Number of pages7
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Issue number8
Publication statusPublished - 2004 Apr 15


  • Emulsion polymerization
  • Gadolinium complex
  • Magnetic force microscopy
  • Magnetic polymers
  • Polyelectrolytes

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry


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