Mössbauer spectroscopy control of the preparation of citric- and mandelic acid functionalized nanomagnetites

A. Lengyel, V. K. Garg, A. C. de Oliveira, S. W. da Silva, L. R. Guilherme, Z. Klencsár, Z. Homonnay, J. A.H. Coaquira, Gy Tolnai, E. Kuzmann

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Iron-oxide nanoparticles were prepared by two ways of chemical methods when the coprecipitated nanomagnetites were functionalized by different (citric and mandelic) carboxylic acids. The colloid samples were characterized by 57Fe Mössbauer spectroscopy, electron microscopy, RAMAN spectroscopy and magnetization measurements. Considerable paramagnetic contributions are present in the 80 K Mössbauer spectra in both citric acid coated and mandelic acid coated nanomagnetites. The 5 K measurement revealed that the paramagnetic component appearing at 80 K can represent a superparamagnetic fraction due to the small particle size in the case of mandelic acid functionalized sample. However, in the case of citric acid functionalized nanomagnetite sample, the paramagnetic components occurring also in the 5 K spectra can be associated with components of precursors and of by-product phases.

Original languageEnglish
Article number17
JournalHyperfine Interactions
Volume239
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

Keywords

  • Carboxylic acid coating
  • Control of synthesis
  • Fe Mössbauer spectroscopy
  • Iron-oxide nanoparticles
  • Superparmagnetism

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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