Revealing the signature of dipolar interactions in dynamic spectra of polydisperse magnetic nanoparticles / Ivanov Alexey O.,Zverev Vladimir S.,Kantorovich Sofia S. // SOFT MATTER. - 2016. - V. 12, l. 15. - P. 3507-3513.

ISSN/EISSN:

1744-683X / 1744-6848

Type:

Article

Abstract:

We investigate, via a modified mean field approach, the dynamic magnetic response of a polydisperse dipolar suspension to a weak, linearly polarised, AC field. We introduce an additional term into the Fokker-Planck equation, which takes into account dipole-dipole interaction in the form of the first order perturbation, and allows for particle polydispersity. The analytical expressions, obtained for the real and imaginary dynamic susceptibilities, predict three measurable effects: the increase of the real part low-frequency plateaux; the enhanced growth of the imaginary part in the low-frequency range; and the shift of the imaginary part maximum. Our theoretical predictions find an experimental confirmation and explain the changes in the spectrum.

Author keywords:

ROTATIONAL DIFFUSION; THERMAL FLUCTUATIONS; MEAN-FIELD; HYPERTHERMIA; RELAXATION; FREQUENCY; MEDIATORS; MOTION

DOI:

10.1039/c5sm02679b

Web of Science ID:

ISI:000374098300003

Соавторы в МНС:

Другие поля

Поле	Значение
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Language	English
EISSN	1744-6848
Keywords-Plus	ROTATIONAL DIFFUSION; THERMAL FLUCTUATIONS; MEAN-FIELD; HYPERTHERMIA; RELAXATION; FREQUENCY; MEDIATORS; MOTION
Research-Areas	Chemistry; Materials Science; Physics; Polymer Science
Web-of-Science-Categories	Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Multidisciplinary; Polymer Science
Author-Email	sofia.kantorovich@univie.ac.at
ResearcherID-Numbers	Zverev, Vladimir/M-7382-2013 Kantorovich, Sofia/H-4586-2011 Ivanov, Alexey/E-4442-2011
ORCID-Numbers	Zverev, Vladimir/0000-0003-0422-1436 Kantorovich, Sofia/0000-0001-5700-7009 Ivanov, Alexey/0000-0001-8239-4039
Funding-Acknowledgement	Russian Science Foundation {[}15-12-10003]; FWF START-Projekt {[}Y 627-N27]; EU {[}642774]
Funding-Text	This research was supported by Russian Science Foundation Grant No. 15-12-10003. S. S. K. is grateful to the FWF START-Projekt Y 627-N27 and EU-Project 642774 ETN-Colldense. We also thank Michaela McCaffrey for language suggestions.
Number-of-Cited-References	48
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	7
Journal-ISO	Soft Matter
Doc-Delivery-Number	DJ3IO