Critical RF losses in fine particles of La1-xAgyMnO3+δ: Prospects for temperature-controlled hyperthermia

被引：11

作者：

Atsarkin, V. A. ^{[1
]}

Generalov, A. A. ^{[1
]}

Demidov, V. V. ^{[1
]}

Mefed, A. E. ^{[1
]}

Markelova, M. N. ^{[2
]}

Gorbenko, O. Yu. ^{[2
]}

Kaul, A. R. ^{[2
]}

Roy, E. J. ^{[3
]}

Odintsov, B. M. ^{[3
]}

机构：

[1] RAS, Kotelnikov Inst Radio Engn & Elect, Moscow 125009, Russia

[2] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119992, Russia

[3] Univ Illinois, Urbana, IL 61801 USA

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2009年 / 321卷 / 19期

基金：

俄罗斯基础研究基金会;

关键词：

Magnetic nanoparticle; Manganite; Dynamic susceptibility; Curie point; Magnetic hyperthermia; Temperature stabilization; MAGNETIC NANOPARTICLES; CANCER; FLUID; FIELD;

D O I：

10.1016/j.jmmm.2009.05.043

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Temperature and frequency dependencies of the real (chi') and imaginary (chi '') parts of the dynamic magnetic susceptibility were studied experimentally in fine particles of La-Ag manganites prepared by various methods. The samples under study have the Curie points in the range T-C = 42-48 degrees C, which is a medical hyperthermia range of interest. When approaching T-C from below, a critical peak of chi '' was revealed, followed by a steep drop while passing to the paramagnetic phase. The experiments on the magnetic radio-frequency (RF) heating of the manganite aqueous suspensions demonstrated good autostabilization of the temperature near T-C. Peculiar instability is found in the heating kinetics, caused by the observed critical behavior of the RF losses. The prospects of the La-Ag manganites as candidates for application in the temperature-controlled hyperthermia are discussed. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：3198 / 3202

页数：5

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