(C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 3590-3595, 2011″
“Polycrystalline Fe(3-x)PtxO(4) films have been prepared by cosputtering at room-temperature. The composition, magnetization and Hall effect measurements indicate that Pt ions have been doped at B-sites. The resistivity is dominated by fluctuation-induced tunneling and decreases with increasing x. The absolute magnetoresistance at room-temperature is above 7% for x <= 0.07. The carrier concentration is lower than that CCI-779 PI3K/Akt/mTOR inhibitor of the single-crystal and epitaxial films. A scaling relation of sigma(xy) alpha sigma(xx) between the Hall and longitudinal conductivities is
obtained for all samples, which fits well with the recent developed universal scaling theory. The decreasing trend of the exponent n from 1.72 to 1.57 with increasing x could be qualitatively ascribed to the influence of the Pt(2+) ions on the magnetic scattering center concentration of the B-sites Fe(2+) ions. These findings make the Fe(3-x)Pt(x)O(4) film a useful candidate for spintronic or extraordinary Hall effect devices applications. (C) 2011 American Institute of Physics. [doi:10.1063/1.3563080]“
“Nonwoven mats were fabricated from a polyvinylidene fluoride (PVDF)/polyethylene glycol 1000 Da (PEG 1000) blend by the electrospinning process. PEG 1000 is a low-temperature phase change material P505-15 inhibitor that acts as a heat storage material,
while PVDF serves as a supporting material to afford a mechanically strong form-stable structure. Addition of fumed silica to electrospun (e-spun) PVDF/PEG 1000 nanofibers helped prevent the leakage of molten PEG 1000 during the solid-liquid phase change, as confirmed by field emission scanning electron microscopy. It was
also found that the addition of fumed silica helps improve the mechanical strength of the PVDF/PEG 1000 nonwoven mats. The thermal properties of PVDF/PEG 1000 and PVDF/PEG 1000/fumed silica composite nonwoven mats were investigated LY294002 cost by differential scanning calorimetry. There were no significant changes in the melting temperature and heat of fusion of PEG 1000 after 100 heating/cooling cycles, thereby confirming that these nonwoven mats have high thermal stability. The fumed-silica-incorporated PVDF/PEG 1000 nonwoven mats had large energy storage capacity and excellent mechanical strength. Hence, the aforementioned types of mats are thought to have various applications in energy storage and in the manufacture of thermoregulating textiles. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 35963603, 2011″
“A new negative temperature coefficient of resistor (NTCR) thermistors based on nitrile butadiene rubber/magnetite (NBR/Fe(3)O(4)) nanocomposites were successfully fabricated by conventional roll milling technique. X-ray diffraction and transmission (TEM) analysis showed that the product is mainly magnetite nanoparticles with diameter of 10-13 nm.