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2000 | 97 | 3 | 591-594
Article title

AC Susceptibility Measurements in the Investigation of Aggregation in Magnetic Fluids

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Languages of publication
EN
Abstracts
EN
Measurements of the complex, frequency dependent susceptibility, χ(ω)=χ '(ω)-iχ''(ω) of two water based magnetic fluids, over the frequency range 10 Hz to 1 MHz are reported. Plots of the susceptibility components against log[f(Hz)] are found to have approximate Debye-type profiles with the presence of Brownian relaxation being indicated by the frequency, f_{max}, of the maximum of the loss-peaks in the χ''(ω) profiles. Corresponding calculations of particle hydrodynamic radius indicate the presence of aggregation. Frohlich, normal and lognormal distribution functions are used to obtain an estimate of the aggregate size distribution in the samples.
Keywords
EN
Publisher

Year
Volume
97
Issue
3
Pages
591-594
Physical description
Dates
published
2000-03
Contributors
author
  • Dept. of Electronic & Electrical Engineering, Trinity College Dublin 2, Ireland
author
  • Dept. of Chemistry, University College of North Wales, Bangor, LL57 2UW, UK
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv97z357kz
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