Abstract
The temperature dependence of the particle size distribution (PSD) of the
magnetic fluid with an additional biocompatible dextran layer was studied
using a ultrasonic method. The measurements of the ultrasound velocity and
attenuation were carried out as a function of the volume concentration of
magnetite particles at temperatures ranging from 15°C to 40°C. In order to
extract the PSD from ultrasonic measurements, the theoretical model of
Vinogradov-Isakovich was used. The extraction of PSD from the ultrasonic
data requires also the measurements the density and viscosity of the
ferrofluid samples. The calculated PSD of the magnetic fluid with an
additional biocompatible layer shows a greater thermal stability than that
of a magnetic fluid with a single surfactant layer.
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