Estimating saturation magnetization of superparamagnetic nanoparticles in liquid phase

Kai Wu, Diqing Su, Jinming Liu, Jian Ping Wang

Research output: Contribution to journalArticle

Abstract

Superparamagnetic nanoparticles (SPMNPs), with unique physical and magnetic properties that differentiate them from their bulk magnetic materials, have been widely studied for potential applications in biomedical areas. With proper surface chemical functionalization, SPMNPs have found their applications in magnetic hyperthermia therapy, magnetic bioassays, drug delivery, magnetic manipulation, etc. These applications require elaborate tuning of the physical and magnetic properties of the SPMNPs such as saturation magnetization Ms and magnetic core size D. In this work, we present a search coil-based method to directly characterize the Ms of SPMNPs in the liquid phase. The nonlinear magnetic responses of SPMNPs under oscillating magnetic fields are exploited and the induced harmonic signals are used to analyze their Ms and D. Different combinations of Ms and D are assumed and their harmonic ratios R are summarized. Curve fitting shows that the harmonic ratio R=0.74+2.85×109∙D-4.41∙Ms -1.44, with the coefficient of determination R-square = 0.98.

LanguageEnglish (US)
Pages394-399
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume471
DOIs
StatePublished - Feb 1 2019

Fingerprint

Saturation magnetization
liquid phases
estimating
Nanoparticles
saturation
nanoparticles
magnetization
Liquids
harmonics
Magnetic properties
Hyperthermia therapy
Physical properties
physical properties
magnetic properties
Magnetic cores
bioassay
magnetic cores
Bioassay
hyperthermia
Magnetic materials

Keywords

  • Ferrofluid
  • Langevin function
  • Saturation magnetization
  • Superparamagnetic nanoparticle

Cite this

Estimating saturation magnetization of superparamagnetic nanoparticles in liquid phase. / Wu, Kai; Su, Diqing; Liu, Jinming; Wang, Jian Ping.

In: Journal of Magnetism and Magnetic Materials, Vol. 471, 01.02.2019, p. 394-399.

Research output: Contribution to journalArticle

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AB - Superparamagnetic nanoparticles (SPMNPs), with unique physical and magnetic properties that differentiate them from their bulk magnetic materials, have been widely studied for potential applications in biomedical areas. With proper surface chemical functionalization, SPMNPs have found their applications in magnetic hyperthermia therapy, magnetic bioassays, drug delivery, magnetic manipulation, etc. These applications require elaborate tuning of the physical and magnetic properties of the SPMNPs such as saturation magnetization Ms and magnetic core size D. In this work, we present a search coil-based method to directly characterize the Ms of SPMNPs in the liquid phase. The nonlinear magnetic responses of SPMNPs under oscillating magnetic fields are exploited and the induced harmonic signals are used to analyze their Ms and D. Different combinations of Ms and D are assumed and their harmonic ratios R are summarized. Curve fitting shows that the harmonic ratio R=0.74+2.85×109∙D-4.41∙Ms -1.44, with the coefficient of determination R-square = 0.98.

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