Abstract
The study investigated the phenomenon of the fast aggregation of single-domain magnetic iron oxide nanoparticles in stable aqueous colloidal suspensions due to the presence of a radio-frequency (RF) magnetic field. Single-domain nanoparticles have specific magnetic properties, especially the unique property of absorbing the energy of such a field and releasing it in the form of heat. The localized heating causes the colloid to become unstable, leading to faster agglomeration of nanoparticles and, consequently, to rapid sedimentation. It has been shown that the destabilization of a stable magnetic nanoparticle colloid by the RF magnetic field can be used for the controlled filtration of larger agglomerates of the colloid solution. Two particular cases of stable colloidal suspensions were considered: a suspension of the bare nanoparticles in an alkaline solution and the silica-stabilized nanoparticles in a neutral solution. The obtained results are important primarily for biomedical applications and wastewater treatment.
Highlights
IntroductionThe most common examples are magnetic resonance imaging [5,6,7], magnetic hyperthermia [8,9,10,11,12,13,14,15], drug delivery/release systems [16,17,18], immune response control [19,20], and environmental remediation [21,22]
Iron oxide nanoparticles and their hosting matrices have been subject to rapidly increasing development
The main goal of this paper is to propose a fast, controllable, and economic method of separating nanoparticle aggregates from the iron-oxide magnetic nanoparticles in an aqueous solution
Summary
The most common examples are magnetic resonance imaging [5,6,7], magnetic hyperthermia [8,9,10,11,12,13,14,15], drug delivery/release systems [16,17,18], immune response control [19,20], and environmental remediation [21,22]
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