Aqueous Superparamagnetic Magnetite Dispersions with Ultrahigh Initial Magnetic Susceptibilities

Yunping Fei, Muhammad Iqbal, Seong D. Kong, Zheng Xue, Charles P. McFadden, Jesse L. Guillet, Linda H. Doerrer, Esen E. Alp, Wenli Bi, Yi Lu, Chola B. Dandamudi, Prashant J. Ranganath, Kevin J. Javier, Mohsen Ahmadian, Christopher J. Ellison, Keith P. Johnston

Research output: Contribution to journalArticle

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Abstract

Superparamagnetic nanoparticles with a high initial magnetic susceptibility χo are of great interest in a wide variety of chemical, biomedical, electronic, and subsurface energy applications. In order to achieve the theoretically predicted increase in χo with the cube of the magnetic diameter, new synthetic techniques are needed to control the crystal structure, particularly for magnetite nanoparticles larger than 10 nm. Aqueous magnetite dispersions (Fe3O4) with a χo of 3.3 (dimensionless SI units) at 1.9 vol %, over 3- to 5-fold greater than those reported previously, were produced in a one-pot synthesis at 210 °C and ambient pressure via thermal decomposition of Fe(II) acetate in triethylene glycol (TEG). The rapid nucleation and focused growth with an unusually high precursor-to-solvent molar ratio of 1:12 led to primary particles with a volume average diameter of 16 nm and low polydispersity according to TEM. The morphology was a mixture of stoichiometric and substoichiometric magnetite according to X-ray diffraction (XRD) and Mössbauer spectroscopy. The increase in χo with the cube of magnetic diameter as well as a saturation magnetization approaching the theoretical limit may be attributed to the highly crystalline structure and very small nonmagnetic layer (∼1 nm) with disordered spin orientation on the surface.

LanguageEnglish (US)
Pages622-629
Number of pages8
JournalLangmuir
Volume34
Issue number2
DOIs
StatePublished - Jan 16 2018

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Superparamagnetism
Iron compounds
iron compounds
Magnetite nanoparticles
Magnetism
Magnetite
Saturation magnetization
Magnetic susceptibility
Dispersions
magnetite
Crystal structure
Nanoparticles
Decomposition
magnetic permeability
decomposition
X ray diffraction
nanoparticles
crystal structure
Polydispersity
Mossbauer spectroscopy

PubMed: MeSH publication types

  • Journal Article
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

Cite this

Fei, Y., Iqbal, M., Kong, S. D., Xue, Z., McFadden, C. P., Guillet, J. L., ... Johnston, K. P. (2018). Aqueous Superparamagnetic Magnetite Dispersions with Ultrahigh Initial Magnetic Susceptibilities. Langmuir, 34(2), 622-629. DOI: 10.1021/acs.langmuir.7b03702

Aqueous Superparamagnetic Magnetite Dispersions with Ultrahigh Initial Magnetic Susceptibilities. / Fei, Yunping; Iqbal, Muhammad; Kong, Seong D.; Xue, Zheng; McFadden, Charles P.; Guillet, Jesse L.; Doerrer, Linda H.; Alp, Esen E.; Bi, Wenli; Lu, Yi; Dandamudi, Chola B.; Ranganath, Prashant J.; Javier, Kevin J.; Ahmadian, Mohsen; Ellison, Christopher J.; Johnston, Keith P.

In: Langmuir, Vol. 34, No. 2, 16.01.2018, p. 622-629.

Research output: Contribution to journalArticle

Fei, Y, Iqbal, M, Kong, SD, Xue, Z, McFadden, CP, Guillet, JL, Doerrer, LH, Alp, EE, Bi, W, Lu, Y, Dandamudi, CB, Ranganath, PJ, Javier, KJ, Ahmadian, M, Ellison, CJ & Johnston, KP 2018, 'Aqueous Superparamagnetic Magnetite Dispersions with Ultrahigh Initial Magnetic Susceptibilities' Langmuir, vol. 34, no. 2, pp. 622-629. DOI: 10.1021/acs.langmuir.7b03702
Fei Y, Iqbal M, Kong SD, Xue Z, McFadden CP, Guillet JL et al. Aqueous Superparamagnetic Magnetite Dispersions with Ultrahigh Initial Magnetic Susceptibilities. Langmuir. 2018 Jan 16;34(2):622-629. Available from, DOI: 10.1021/acs.langmuir.7b03702
Fei, Yunping ; Iqbal, Muhammad ; Kong, Seong D. ; Xue, Zheng ; McFadden, Charles P. ; Guillet, Jesse L. ; Doerrer, Linda H. ; Alp, Esen E. ; Bi, Wenli ; Lu, Yi ; Dandamudi, Chola B. ; Ranganath, Prashant J. ; Javier, Kevin J. ; Ahmadian, Mohsen ; Ellison, Christopher J. ; Johnston, Keith P./ Aqueous Superparamagnetic Magnetite Dispersions with Ultrahigh Initial Magnetic Susceptibilities. In: Langmuir. 2018 ; Vol. 34, No. 2. pp. 622-629
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