Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"alternating magnetic field"”.
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Modeling and control of a self-assembled robotic swimmer
… swimmer forms when a liquid suspension of ferro-magnetic micro-particles and a non-magnetic bead are exposed to an alternating magnetic field that is oriented per- pendicular to the liquid surface [1]. It can be steered by modulating the frequency of the alternating field. We model the swimmer as …
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A quantitative design and analysis of magnetic nanoparticle heating systems
Magnetic particles under the influence of an alternating magnetic field act as localized heating sources due to various loss mechanisms. This effect has been extensively investigated in hypothermia studies over the past decades and has recently been applied at the molecular level to control the …
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Encapsulamento de nanopartículas magnéticas em polímeros acrílicos e avaliação de hipertermia para potencial tratamento de câncer
This work describes the synthesis of magnetic iron oxide nanoparticles encapsulated in acrylic polymers. Magnetite (Fe3O4) was obtained through coprecipitation and encapsulated by inverse and direct miniemulsion polymerization, in poly(acrylic acid) and poly(methyl methacrylate), respectively. …
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Control of oligonucleotide conformation on nanoparticle surfaces for nanoscale heat transfer study
… covalently linked to biomolecules. External alternating magnetic field can turn on and off the biological activity of the molecules due to induction heating from the particles that changes the temperature around the molecules. Here an experimental scheme towards direct temperature probing is …
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Magnetically-driven Therapeutic Agents Delivery System using Iron Oxide Nanocages and Enhancement of Exosome Secretion, a Potential Biological Drug Delivery Carrier
… as siRNA delivery carriers under the alternating magnetic field and the development of a method to amplify the secretion of 150 nm exosomes from the cells, which could potentially use as a biological drug carrier.</p> <p>Chapter 2 discusses a magnetically driven nanoparticle …
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Synthesis and characterization of magnetic nanorings for neuronal stimulation
Magnetic nanorings (MNRs) are anisotropic nanomaterials that can support a magnetic vortex state, which can yield both colloidal stability and large hysteretic power losses when exposed to an alternating magnetic field (AMF). Coupled with the biocompatibility of polymer surface coatings, MNRs have …
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Design and Fabrication of High Frequency Electromagnetic Coil for Magnetic Particle Imaging
Magnetic Particle Imaging (MPI) is a promising modality which uses Magnetic Nanoparticles (MNPs) for tracer-based imaging in biomedical applications. Aside from their use in imaging, MNPs are increasingly being utilized for therapeutics, controlled targeted drug delivery, and diagnostics. These …
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Targeted magnetic nanoparticles for remote manipulation of protein aggregation
Local heat delivered by magnetic nanoparticles (MNPs) selectively attached to their target proteins can be used to manipulate and break up toxic or obstructive aggregates. We applied this magnetic hyperthermia treatment to the amyloid beta (A[beta]) peptide, which unnaturally folds and …
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Targeted magnetic hyperthermia for lung cancer
… to develop an effective means to treat NSCLC. Magnetic hyperthermia is a novel non-invasive approach for ablation of lung tumors, and is based on heat generation by magnetic materials, such as superparamagnetic iron oxide (SPIO) nanoparticles, when subjected to an alternating magnetic field. …
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Evaluation of nanoparticles-based thermotherapy for cancer
Under alternating magnetic field, superparamagnetic iron oxide nanoparticles can be used to generate heat for the treatment of cancer. With suitable coating, these nanoparticles are biocompatible, stable in solution, and absorbed by tumor cells in good contrast. The mechanism of heating is mainly …
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Encapsulation of nanomagnetite within polycaprolactone microspheres for bone replacement
… can soften in response to the application of an alternating magnetic field. The magnetite nanoparticles were synthesized by a non-surfactant method and then emulsified with PCL. Particle size analysis using light scattering showed that the size distributions of magnetite nanoparticles were …
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Analysis and design of ferrite cores for eddy current-killed oscillator inductive proximity sensors
… in these sensors is to concentrate and focus the alternating magnetic field produced by a current-carrying winding. The magnetic flux is specifically aimed at the sensor's metal target, and since the sensing operation is dependent on the generation of eddy currents within the metal target, the …
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Comportamento térmico em regime não-adiabático de nanopartículas superparamagnéticas sob ação de um campo magnético oscilante
The phenomena of raising the temperature of magnetic nanoparticles under an alternating magnetic field, known as magnetic hyperthermia, is an outstanding field, which gives rise to challenges in the context of fundamental physics and providing new roads to applications, such as in the cancer …
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Magnetothermal multiplexing for biomedical applications
Research on biomedical applications of magnetic nanoparticles (MNPs) has increasingly sought to demonstrate noninvasive actuation of cellular processes and material responses using heat dissipated in the presence of an alternating magnetic field (AMF). By modeling the dependence of hysteresis …
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Magnetic and Elastic Interactions at Cracks and Interfaces in Ferromagnetic Materials
… evaluation techniques, interactions between magnetic fields and defects in solids may also alter material properties. To explore this possibility, Maxwell's equations were coupled with a continuum mechanics model for elastic strain to formulate analytical expressions for the interaction of a …
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Properties and biomedical applications of magnetic nanoparticles
<p>Magnetic nanoparticles have a number of unique properties, making them promising agents for applications in medicine including magnetically targeted drug delivery, magnetic hyperthermia, magnetic resonance imaging, and radiation therapy. They are biocompatible and can also be coated with …
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The effect of AC magnetic fields on liquid-metal free surfaces in industrialMHD
… pool of liquid metal when it is submitted to an alternating magnetic field. The first problem we examine considers the effect of a low-frequency mag- netic field on a pool of liquid metal. An initially circular pool is deformed into radially oscillating starfish modes at certain critical magnetic …
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Exploring the Biomedical Applications of Polyurethane-based Foams, Films, and Hydrogels
… exposure to an external stimulus, such as heat, magnetic field, moisture, pH, light, or electric field. The ability of SMPs to change shape when required can be used for a wide range of applications, especially in the case of minimally invasive biomedical applications. In this work, …
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Magnetic Induction for In-situ Healing of Polymeric Material
The field of self-healing materials is growing dramatically due to the obvious in- centive of having structural materials with the ability to repair damage. Some polymers have demonstrated the ability to heal from damage autonomously[12, 26], when exposed to heat[1], or when punctured[5, 9]. The …
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Synthesis, Characterization and Structure-Property Relationships of Polymer-Stabilized Nanoparticles Containing Imaging and Therapeutic Agents
The controllable design of magnetic nanocarriers is essential for advanced in vivo applications such as magnetic resonance image-guided therapeutic delivery and alternating magnetic field-induced remote release of drugs. This work describes the fabrication of polymer-stabilized nanoparticles …
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