Alternating magnetic field energy absorption in the dispersion of iron oxide nanoparticles in a viscous medium

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F15%3A00450283" target="_blank" >RIV/68081723:_____/15:00450283 - isvavai.cz</a>

Alternative codes found

RIV/70883521:28610/15:43872962

Result on the web

<a href="http://dx.doi.org/10.1016/j.jmmm.2014.08.096" target="_blank" >http://dx.doi.org/10.1016/j.jmmm.2014.08.096</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jmmm.2014.08.096" target="_blank" >10.1016/j.jmmm.2014.08.096</a>

Result language

angličtina

Original language name

Alternating magnetic field energy absorption in the dispersion of iron oxide nanoparticles in a viscous medium

Original language description

Magnetic iron oxide nanoparticles were obtained by a coprecipitation method in a controlled growth process leading to the formation of uniform highly crystalline nanoparticles with average size of 13 nm, which corresponds to the superparamagnetic state. Nanoparticles obtained are a mixture of single-phase nanoparticles of magnetite and maghemite as well as nanoparticles of non-stoichiometric magnetite. The subsequent annealing of nanoparticles at 300 degrees C in air during 6 h leads to the full transformation to maghemite. It results in reduced value of the saturation magnetization (from 56 emu g(-1) to 48 emu g(-1) but does not affect the healing ability of nanoparticles. A 2-7 wt% dispersion of as-prepared and annealed nanoparticles in glycerol provides high healing rate in alternating magnetic fields allowed for application in magnetic hyperthermia; however the value of specific loss power does not exceed 30 W g(-1). This feature of heat output is explained by the combined effect of magnetic interparticle interactions and the properties of the carrier medium. Nanoparticles coalesce during the synthesis and form aggregates showing ferromagnetic-like behavior with magnetization hysteresis, distinct sexes on Mossbauer spectrum, blocking temperature well about room temperature, which accounts for the higher energy barrier for magnetization reversal. At the same time, low specific heat capacity of glycerol intensifies heat transfer in the magnetic dispersion. However, high viscosity of glycerol limits the specific loss power value, since predominantly the Neel relaxation accounts for the absorption of AC magnetic field energy.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

<a href="/en/project/ED2.1.00%2F03.0111" target="_blank" >ED2.1.00/03.0111: Centre of Polymer Systems</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Magnetism and Magnetic Materials

ISSN

0304-8853

e-ISSN

—

Volume of the periodical

374

Issue of the periodical within the volume

JAN

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

8

Pages from-to

508-515

UT code for WoS article

000344949000082

EID of the result in the Scopus database

2-s2.0-84907279771