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Magnetic relaxation and dissipative heating in ferrofluids
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TLDR
In this paper, the authors investigated the ac magnetic susceptibility and magnetic heating of aqueous suspensions of γ•Fe2O3 nanoparticles embedded in alginate hydrogel matrix and isolated γ−Fe 2O3 and Fe3O4 nanoparticles coated with tetramethyl ammonium hydroxide.Abstract:
We have investigated the ac magnetic susceptibility and magnetic heating of aqueous suspensions of γ‐Fe2O3 nanoparticles embedded in alginate hydrogel matrix and isolated γ‐Fe2O3 and Fe3O4 nanoparticles coated with tetramethyl ammonium hydroxide. All three ferrofluids were characterized by measuring the dc magnetization, ac susceptibility, and magnetic heating. We found that significant Neel relaxation is present in all samples, but only the isolated nanoparticle ferrofluids show any significant feature associated with Brownian relaxation near the freezing temperature of the carrier liquid. The heating rate of the ferrofluids varies systematically with the magnitude of the Brownian relaxation peak, despite similar values of the absolute magnetization. These results highlight the importance of the Brownian relaxation for heating applications incorporating magnetic nanoparticles.read more
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Magnetic hydrogel nanocomposites for remote controlled pulsatile drug release
Nitin S. Satarkar,J. Zach Hilt +1 more
TL;DR: Remote controlled pulsatile drug release was characterized for different drugs as well as for different ON-OFF durations of the AMF.
Journal ArticleDOI
Multipurpose smart hydrogel systems
TL;DR: New hydrogel systems and nanocomposites based on acrylic monomers with incorporated nanosized colloidal silver, hydroxyapatite and carbon nanotubes with a new set of properties have been obtained and examined.
Journal ArticleDOI
Magneto-responsive hydrogels based on maghemite/triblock terpolymer hybrid micelles
Stefan Reinicke,Stefan Döhler,Sandrine Tea,Marina Krekhova,Renate Messing,Annette M. Schmidt,Holger Schmalz +6 more
TL;DR: In this article, a triblock terpolymer with a partially quaternized poly(2-vinylpyridine) (Pq2VP) outer block, a water soluble poly(ethylene oxide), a PEO middle block and a thermo-sensitive poly(glycidyl methyl ether-co-ethyl glycidyl ether) (GME-co)-EGE)) end block was mixed with a solution of sodium citrate stabilized superparamagnetic maghemite nanoparticles.
Journal ArticleDOI
Nickel ferrite nanoparticles for simultaneous use in magnetic resonance imaging and magnetic fluid hyperthermia.
TL;DR: MRI contrast enhancement and ac-field induced heating abilities of tetramethylammoniumhydroxide coated nickel ferrite (NiFe2O4) nanoparticles allow the simultaneous use of nickelferrites in diagnostic and therapeutic applications as theranostic agents.
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Investigation of magnetic properties of Fe3O4 nanoparticles using temperature dependent magnetic hyperthermia in ferrofluids
TL;DR: In this paper, the authors investigated temperature dependent magnetic hyperthermia in ferrofluids, consisting of dextran coated superparamagnetic Fe3O4 nanoparticles, subjected to external magnetic fields of various frequencies (188-375 kHz) and amplitudes (140-235 Oe).
References
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TOPICAL REVIEW: Applications of magnetic nanoparticles in biomedicine
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Heating magnetic fluid with alternating magnetic field
TL;DR: In this paper, the authors developed analytical relationships and computations of power dissipation in magnetic fluid (ferrofluid) subjected to alternating magnetic field and showed that the dissipation results from the orientational relaxation of particles having thermal fluctuations in a viscous medium.
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Ultrasmall superparamagnetic iron oxide: characterization of a new class of contrast agents for MR imaging.
TL;DR: An ultrasmall superparamagnetic iron oxide preparation was developed that is small enough to migrate across the capillary wall, a prerequisite in the design of targetable particulate pharmaceuticals.
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Noncollinear Spin Arrangement in Ultrafine Ferrimagnetic Crystallites
TL;DR: In this article, it was shown that the spin configuration differs from the N\'eel type found in large crystallites, and it was proposed that the ions in the surface layer are inclined at various angles to the direction of the net moment.