Influence of the concentration of magnetic nanoparticles in polyelectrolyte shells on the resonant frequency of the magnetic field triggered the release of the encapsulated substance

Abstract

A promising way to control the permeability of magnetically sensitive polyelectrolyte microcapsules (PECs) is to use a low-frequency magnetic field. In this case, the energy of the magnetic field can be converted into rotational motion of single-domain magnetic nanoparticles causing the deformations of the PEC shell and increase in its permeability.
In our work, we obtained several magnetically sensitive PECs with the following shell structure: PAH/PSS/PAH/MNP/PSS/PAH/PSS, where PAH is Poly (allylamine hydrochloride), PSS is Poly (styrene sulfonate), and MNP is magnetite nanoparticles. We found that the increase in the release of the encapsulated TRITC-dextran occurs at different frequencies (50 and 77 Hz) for different batches of capsules. To clarify this effect we performed numerical simulation of the rotation of a magnetic nanoparticle in a PEC shell under the action of a low-frequency magnetic field. We showed, that the simulated curves, which represent the dependences of the MNP rotation amplitude on the frequency of a magnetic field, have a resonant character. In simulation we demonstrated that an increase in the force acting from the side of the PECs shell on magnetic nanoparticles leads to an increase in the frequency of the magnetic field, at which the rotation amplitude of the MNP reaches a maximum. We assume that this can be experimentally verified using PECs with a different concentration of magnetic nanoparticles in the PEC shell.
This work was supported by the grant of the President of the Russian Federation (МК-1109.2021.1.3).

Speaker

Ivan Burmistrov
Shubnikov Institute of Crystallography of Federal Scientific Research Centre ‘‘Crystallography and Photonics” of Russian Academy of Sciences, 119333, Russia
Russia

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