Magnetic relaxation and dissipative heating in ferrofluids

Vaishnava, P. P.; Tackett, Ronald; Dixit, Ambesh; Sudakar, C.; Naik, R.; Lawes, G.

doi:10.1063/1.2784080

Cited by 30 publications

(26 citation statements)

References 35 publications

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“…A more detailed discussion of the synthesis technique is given in Ref. [22]. For the magnetic measurements having the sample mounted in vacuum, these ferrofluids were mixed with diamagnetic Stycast 1266 epoxy to obtain solid samples.…”

Section: Methodsmentioning

confidence: 99%

Magnetic and optical response of tuning the magnetocrystalline anisotropy in Fe3O4 nanoparticle ferrofluids by Co doping

Tackett

Sudakar

Naik

et al. 2008

Journal of Magnetism and Magnetic Materials

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Section: Methodsmentioning

confidence: 99%

Magnetic and optical response of tuning the magnetocrystalline anisotropy in Fe3O4 nanoparticle ferrofluids by Co doping

Tackett

Sudakar

Naik

et al. 2008

Journal of Magnetism and Magnetic Materials

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“…The heat generation is typically quantified by the specific absorption rate (SAR), which is defined as the thermal power per unit mass of magnetic material generated in the presence of an alternating magnetic field. Many studies in the literature report on SAR of novel nanoparticle systems or test their efficacy in treating various types of cancer tumors [17][18][19][20][21][22][23][24]. The attempts to back up the experimental SAR with first principle calculations are scarce [25].…”

Section: Introductionmentioning

confidence: 99%

Comparison between experimental and predicted specific absorption rate of functionalized iron oxide nanoparticle suspensions

Yuan

Tasciuc

2011

Journal of Magnetism and Magnetic Materials

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“…Heating of magnetic particles when exposed to AMF is attributed to Neel/Brownian relaxations, and hysteresis loss. 32 As expected, increasing the amount of magnetic particles resulted in higher equilibrium temperatures at the same AMF amplitude. Similarly, increasing AMF amplitude led to more heating and higher equilibrium temperatures.…”

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confidence: 53%

Remote actuation of hydrogel nanocomposites: Heating analysis, modeling, and simulations

et al. 2011

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Recently, there has been increasing interest in remote heating of polymer nanocomposites for applications such as actuators, microfluidic valves, drug delivery devices, and hyperthermia treatment of cancer. In this study, magnetic hydrogel nanocomposites of poly(ethylene glycol) (PEG) with varying amounts of iron oxide nanoparticle loadings were synthesized. The nanocomposites were remotely heated using an alternating magnetic field (AMF) at three different AMF amplitudes, and the resultant temperatures were recorded. The rate of the temperature rise and the steady state temperatures were analyzed with a heat transfer model, and a correlation of heat generation per unit mass with the nanoparticle loadings was established for different AMF amplitudes. The temperature rise data of a PEG system with different swelling properties were found to be accurately predicted by the model. Furthermore, the correlations were used to simulate the temperatures of the nanocomposite and the surrounding tissue for potential hyperthermia cancer treatment applications. V V C 2010 American Institute of Chemical Engineers AIChE J, 57: 852-860, 2011 Keywords: biomaterials, biomedical engineering, nanotechnology, heat transfer, composite materials IntroductionNanoparticulates, such as iron oxide nanoparticles, gold nanorods and nanoshells, and carbon nanotubes (CNT) can be remotely heated with the application of specific external stimuli, such as radiofrequency fields or near-infrared light. 1 The incorporation of these nanoparticulates into a polymer matrix can result in several interesting properties including improved mechanical, thermal, or electrical behavior, 2 as well as the capability of remote actuation. 3,4 In the last few years, there have been several studies on the remote heating of polymer nanocomposites for a variety of applications, such as actuators, 5-8 microfluidic valves, 9,10 drug delivery devices, [11][12][13][14][15] and for hyperthermia cancer treatment. [16][17][18][19] For example, an alternating magnetic field (AMF) has been shown to selectively induce heating and shape transition in magnetic shape memory polymer nanocomposites. 5,8 In another study, Hawkins et al. demonstrated that addition of iron oxide nanoparticles to a degradable hydrogel matrix can allow heating upon AMF exposure, which was in turn used to manipulate the rates of degradation and drug release.14 AMF heating has also been explored to trigger the collapse of magnetic nanocomposites of N-isopropylacrylamide (NIPAAm), a temperature responsive hydrogel. This phenomenon has been used to demonstrate accelerated drug release, as well as microfluidic valve applications. 10,11,15 In a recent study, Meenach et al. observed favorable cell viability of magnetic NIPAAm nanocomposites with NIH 3T3 murine fibroblasts and also showed heating on the application of Correspondence concerning this article should be addressed to J. Z. Hilt at hilt@ engr.uky.edu. AMF.18 In all these studies, heating of the nanocomposites was a key factor, and precise control...

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Magnetic relaxation and dissipative heating in ferrofluids

Cited by 30 publications

References 35 publications

Magnetic and optical response of tuning the magnetocrystalline anisotropy in Fe3O4 nanoparticle ferrofluids by Co doping

Magnetic and optical response of tuning the magnetocrystalline anisotropy in Fe3O4 nanoparticle ferrofluids by Co doping

Comparison between experimental and predicted specific absorption rate of functionalized iron oxide nanoparticle suspensions

Remote actuation of hydrogel nanocomposites: Heating analysis, modeling, and simulations

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