中国物理B ›› 2020, Vol. 29 ›› Issue (10): 100502-.doi: 10.1088/1674-1056/aba2dc

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S Rosales1, N Casillas1, A Topete3, O Cervantes1, G González1, J A Paz2, M E Cano2,†()   

  • 收稿日期:2020-02-01 修回日期:2020-06-13 接受日期:2020-07-06 出版日期:2020-10-05 发布日期:2020-10-05
  • 通讯作者: M E Cano

Evaluating physical changes of iron oxide nanoparticles due to surface modification with oleic acid

S Rosales1, N Casillas1, A Topete3, O Cervantes1, G Gonz\'alez1, J A Paz2, and M E Cano2,†   

  1. 1 Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Marcelino García Barragán 1421, C. P. 44430, Guadalajara, Jalisco, México
    2 Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, C. P. 47820, Ocotlán, Jalisco, México
    3 Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Sierra Mojada 950, C. P. 44340, Guadalajara, Jalisco, México
  • Received:2020-02-01 Revised:2020-06-13 Accepted:2020-07-06 Online:2020-10-05 Published:2020-10-05
  • Contact: Corresponding author. E-mail: meduardo2001@hotmail.com

Abstract:

The physical characterization of a colloidal system of superficially modified magnetic nanoparticles (MNPs) is presented. The system consists of oleic acid-coated iron oxide nanoparticles (OAMNP) suspended in water. A structural analysis is carried out by using standard physical techniques to determine the diameter and shape of the MNPs and also the width of the coating shell. The colloidal stability and the polydispersity index of this ferrofluid are determined by using Zeta potential measurements. Additionally, the magnetic characterization is conducted by obtaining the DC magnetization loops, and the blocking temperatures are determined according to the ZFC–FC protocol. Finally, the values of power absorption density P of the ferrofluid are estimated by using a magneto-calorimetric procedure in a wide range of magnetic field amplitude H and frequency f. The experimental results exhibit spherical-like shape of OAMNP with (20 ± 4) nm in diameter. Due to the use of coating process, the parameters of the magnetization loops and the blocking temperatures are significantly modified. Hence, while the uncoated MNPs show a blocking state of the magnetization, the OAMNP are superparamagnetic above room temperature (300 K). Furthermore, the reached dependence P versus f and P versus H of the ferrofluid with coated MNPs are clearly fitted to linear and quadratic correlations, respectively, showing their accordance with the linear response theory.

Key words: nanoparticles, ferrofluid, magnetic hyperthermia, functionalization

中图分类号:  (Thermodynamics)

  • 05.70.-a
47.65.Cb (Magnetic fluids and ferrofluids) 47.65.Cb (Magnetic fluids and ferrofluids) 87.85.jj (Biocompatibility)