02060nas a2200229 4500008004100000022001400041245015900055210006900214260007300283300001400356490000800370520113800378653002801516653002601544653002601570653002801596653001501624100002001639700002001659700002401679856012701703 2011 eng d a0169-433200aEnhanced dielectric permittivity in poly (vinylidene) fluoride/multiwalled carbon nanotubes nanocomposite thin films fabricated by pulsed laser deposition0 aEnhanced dielectric permittivity in poly vinylidene fluoridemult aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV a1256-12600 v2583 a

The fabrication of high quality thin films of poly (vinylidene fluoride) embedded with multiwalled carbon nanotubes using pulsed laser deposition technique is reported. The prepared films were characterized for structural, morphology and dielectric properties. The morphology analysis revealed uniform dispersion of multiwalled carbon nanotubes throughout the polymer matrix. X-ray diffraction results suggested that the poly (vinylidene fluoride) film is in amorphous phase while addition of multiwalled carbon nanotubes showed presence of crystalline peaks in the nanocomposites films. It was interesting to note that the nanocomposite films exhibits significant enhancement of the ferroelectric beta-phase as evidenced by the X-ray diffraction and Fourier transform infrared spectroscopy results. The dielectric analysis shows a remarkable enhancement in the dielectric permittivity of nanocomposites with lower loss and conductivity level. The results can be attributed to the formation of minicapacitor network and relatively higher percolation threshold in the nanocomposites. (C) 2011 Elsevier B.V. All rights reserved.

10aDielectric permittivity10aFerroelectric polymer10aPercolation threshold10apulsed laser deposition10aThin films1 aChanmal, Chetan1 aDeo, Meenal, S.1 aJog, Jyoti, Prakash uhttps://library.ncl.res.in/content/enhanced-dielectric-permittivity-poly-vinylidene-fluoridemultiwalled-carbon-nanotubes-001751nas a2200205 4500008004100000022001400041245006800055210006600123260012100189300001200310490000700322520099900329653001501328653001601343653002001359653002201379100002001401700002401421856010001445 2012 eng d a1229-919700aElectrospinning of PHBV/ZnO membranes: structure and properties0 aElectrospinning of PHBVZnO membranes structure and properties aKOREA SCIENCE TECHNOLOGY CTR \#501 635-4 YEOGSAM-DONG, KANGNAM-GU, SEOUL 135-703, SOUTH KOREAbKOREAN FIBER SOCcJUL a692-6970 v133 a

Polyhydroxy butyrate-co-valerate (PHBV) - Zinc oxide (ZnO) nano composite fibers were prepared using electrospinning. The structural and optical properties were studied using Fourier transform infrared spectroscopy (FT-ER), X-ray diffraction (XRD) and photoluminescence study (PL). The morphology observed with scanning electron microscope (SEM) revealed no significant changes in the nano composite fibers as compared to bare polymer. The low concentration of ZnO nanoparticles resulted in an increase in overall crystallinity of the polymer matrix which was confirmed from FT-IR and XRD results. The photoluminescence (PL) study indicated the quenching of visible emission in the composite fibers. The ratio of UV to visible emission (I-uv/I-vis) intensity was found to be 12.8 times enhanced in the composite fibers compared to bare ZnO nanoparticles. The nanofibrous mats are self supported and hence offer potential applications in optoelectronic devices and the biomedical imaging.

10aBiomarkers10aBiopolymers10aelectrospinning10aZnO nanoparticles1 aNaphade, Rounak1 aJog, Jyoti, Prakash uhttps://library.ncl.res.in/content/electrospinning-phbvzno-membranes-structure-and-properties-001469nas a2200181 4500008004100000022001400041245010100055210006900156260011000225300001200335490000600347520072300353100001901076700001801095700002501113700002401138856012501162 2012 eng d a2040-336400aEnhanced piezoresponse of electrospun PVDF mats with a touch of nickel chloride hexahydrate salt0 aEnhanced piezoresponse of electrospun PVDF mats with a touch of  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcFEB a752-7560 v43 a

PVDF nanofibers are prepared using electrospinning. The effect of addition of a hydrated salt, nickel chloride hexahydrate (NiCl2 center dot 6H(2)O), on the phase formation is examined. Addition of the hydrated salt (NC) is found to enhance the polar beta phase by about 30%. The peak to peak piezo-voltage generated for PVDF NC is almost 0.762 V, a factor of 3 higher than that for PVDF. The fiber mats exhibit a significantly enhanced dynamic strain sensor response. The voltage generated per unit micro-strain developed during the free vibration test for PVDF was 0.119 mV whereas it was 0.548 mV for PVDF NC, exhibiting a non-linearly enhanced performance vis a vis the increase in the beta phase component.

1 aDhakras, Dipti1 aBorkar, Vivek1 aOgale, Satishchandra1 aJog, Jyoti, Prakash uhttps://library.ncl.res.in/content/enhanced-piezoresponse-electrospun-pvdf-mats-touch-nickel-chloride-hexahydrate-salt-0