Results 261 to 270 of about 2,241,461 (303)
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Solid State Communications, 1970
A Mossbauer study of iron gel shows magnetic ordering below a superparamagnetic transition at 45°K. The particle size is about 50 A. The frequency factor and the anisotropy energy density were found to be ƒ0 = 2.2. 109 sec−1 and K = 4.105 erg/cm3 respectively. The lack of diffraction patterns at room temperature is explained.
Z. Mathalone, M. Ron, A. Biran
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A Mossbauer study of iron gel shows magnetic ordering below a superparamagnetic transition at 45°K. The particle size is about 50 A. The frequency factor and the anisotropy energy density were found to be ƒ0 = 2.2. 109 sec−1 and K = 4.105 erg/cm3 respectively. The lack of diffraction patterns at room temperature is explained.
Z. Mathalone, M. Ron, A. Biran
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Voltage-sensitive magnetic gels as magnetic resonance monitoring agents
Nature, 1993Many polymer gels undergo a volume phase transition in electric fields. We report here the synthesis of a polyelectrolyte gel that incorporates magnetic particles of iron oxide into the polymer network; these particles couple the gel volume transition to the NMR relaxation times of the surrounding water.
S, Frank, P C, Lauterbur
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Magnetization transfer imaging for polymer gel dosimetry
Physics in Medicine and Biology, 2002Off-resonance RF pre-saturation was used to obtain contrast in MRI images of polymer gel dosimeters irradiated to doses up to 50 Gy. Two different polymer gel dosimeters composed of 2-hydroxyethyl-acrylate or methacrylic acid monomers mixed with N, N'-methylene-bisacrylamide (BIS), dispersed in an aqueous gelatin matrix were evaluated.
Page, Martin +5 more
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Discontinuous elongation of nematic gels by a magnetic field
Physical Review E, 2001The effects of a magnetic field on the swelling of a nematic gel immersed in a low molecular weight liquid crystal solvent are examined by using a mean field theory. The nematic-isotropic (paranematic) phase transition temperature of the gel and the solvent is controlled by the external field.
A, Matsuyama, T, Kato
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Power electronic drives for magnetically triggered gels
IEEE Transactions on Industrial Electronics, 1997Properly fabricated polymer gels exhibit an abrupt change in volume in response to a small change in an environmental parameter, such as temperature. The authors have developed gels that change in volume in response to an applied alternating magnetic field, and are working to apply these gels as actuators. This paper describes power electronic circuits
Deron K. Jackson +5 more
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Magnetism and compressive modulus of magnetic fluid containing gels
Journal of Applied Physics, 1999We have investigated the magnetism and have measured the compressive modulus of magnetic fluid containing gels, called ferrogels, in the presence of magnetic field. No hysteresis was shown in the magnetization curve of the ferrogel suggesting a super paramagnetic response. The equilibrium compressive modulus of the ferrogel was measured up to 4 kOe and
Tetsu Mitsumata +5 more
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Synthesis of Magnetic Nanoparticles Incorporated Smart Gel
Journal of Nanoscience and Nanotechnology, 2015In this work, we prepared new poly(vinyl alcohol) (PVA) based magnetic-pH responsive smart gels comprised of nickel nanoparticles and cross-linked PVA with a pH responsive poly(methyl methacrylic acid) (PMAA) (designated as (PVA-PMAA/Ni-NCGs). We developed a strategy based on the modification of PVA with glycidyl methacrylate (GMA) groups, which has ...
Jun, Li +2 more
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Anisotropy in Storage Modulus of Magnetic Gels Induced by Magnetization
Japanese Journal of Applied Physics, 2004The effects of magnetization direction on the complex modulus of magnetic gels, which consist of magnetized barium ferrite and poly vinyl alcohol, have been investigated. The modulus after magnetization showed anisotropy depending on the geometry of magnetization and strain direction.
Tetsu Mitsumata +3 more
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Biodegradable magnetic gel: synthesis and characterization
Colloid and Polymer Science, 2003Biodegradable polymer-based magnetic gels have been synthesized using hydroxypropyl cellulose and maghemite. These magnetic gels have a network of nanoparticles of hydroxypropyl cellulose (30–100 nm) and a homogeneous distribution of nanosized maghemite (~7 nm). This has been observed in a STEM micrograph.
Jhunu Chatterjee +2 more
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