Effect of Phase Transitions in Polymer Solutions on
the Magnetic Response of Embedded Nanoparticles
Posted on 2020-06-15 - 15:06
Doping complex polymer
solutions with magnetic nanoparticles opens
up a class of functional materials. However, a distinct decrease in
the degree of magnetic in-field alignment of nanoparticles upon crystallization
of the carrier liquid is observed, which could pose a crucial hindrance
for the preparation of such hybrid materials. To understand their
behavior in detail, including their performance over extended temperature
ranges and their structural transformations in the presence of external
fields, it is useful to employ direct methods that provide information
on the particle length scale. Here, we aim to understand the quasi-static
magnetic behavior of magnetic particles in complex fluid environments
employing aqueous solutions of poly(ethylene glycol) as model systems
and discuss their thermomagnetic behavior under the influence of phase
transitions. For this purpose, magnetically blocked nanoparticles
based on cobalt ferrite (CoFe2O4) are utilized
as tracer particles in temperature-dependent magnetization measurements
complemented by differential scanning calorimetry (DSC). Following
this approach, a detailed understanding of the impact of thermal phase
transitions such as (eutectic) melting and freezing as well as glass
transitions on the mobility of the particles is obtained at different
concentration regimes.
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Webers, Samira; Hess, Melissa; Landers, Joachim; Schmidt, Annette M.; Wende, Heiko (2020). Effect of Phase Transitions in Polymer Solutions on
the Magnetic Response of Embedded Nanoparticles. ACS Publications. Collection. https://doi.org/10.1021/acsapm.0c00298