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Rengasamy, Tamilarasan,Arun, Anand Prabu,Muniswamy, Raajenthiren,Mahendradas, Dharmendira Kumar,Yoo, Chang Kyoo The Society of Chemical Engineers, Japan 2009 Journal of chemical engineering of Japan Vol.42 No.7
<P>This communication presents the effect of five dissolved inorganic salts (sodium chloride, NaCl; calcium chloride, CaCl<SUB>2</SUB>; zinc chloride, ZnCl<SUB>2</SUB>; cadmium chloride, CdCl<SUB>2</SUB>; ammonium chloride, NH<SUB>4</SUB>Cl) on the enthalpy of mixing (<I>H</I><SUP>E</SUP>) of ethyl acetate/benzene binary system at 303.15 K; enthalpy measurements were performed using an isothermal displacement calorimeter with vapor space. The excess enthalpy of mixing of this system is significantly reduced in the presence of NH<SUB>4</SUB>Cl and NaCl; however, changes in the excess enthalpy of mixing were insignificant in the presence of CaCl<SUB>2</SUB>, ZnCl<SUB>2</SUB>, and CdCl<SUB>2</SUB>. The experimental values of <I>H</I><SUP>E</SUP> were fitted into the Redlich–Kister equation, and deviations from the ideal value and binary parameters were calculated. The importance of solute–solvent interactions was demonstrated from the decrease in the excess enthalpy of mixing in the negative direction with an increase in the NaCl concentration.</P>
Lee, Jong Soon,Prabu, A. Anand,Chang, You Min,Kim, Kap Jin Wiley - VCH Verlag GmbH & Co. KGaA 2007 Macromolecular Symposia Vol.249 No.-
<P>Ultrathin ferroelectric P(VDF/TrFE(72/28) films were used in the fabrication of metal-ferroelectric polymer-metal single bit device with special emphasis on the formation of uniform film surface, faster dipole switching time under an external electric field, and longer memory retention time. FTIR-GIRAS and AFM were used complementarily in analyzing the changes in chain orientation and surface crystalline morphology with varying sample preparation methods. It was found that the magnitudes of remnant polarization and coercive field are highly related to the degree of chain orientation along the conductive substrate surface. The cast- annealed sample showed the highest polarization and the smallest coercive field. DC-EFM technique was successfully used to ‘write and erase’ the data bit on the ultrathin P(VDF/TrFE) film by applying a dc bias voltage much larger than coercive voltage with different polarities and the data bit state could be read by measuring the piezoelectric response of the cantilever with a lock-in amplifier by applying an ac modulating voltage whose V<SUB>pp</SUB> is much less than the coercive voltage.</P>
Ponnan Sathiyanathan,Arun Anand Prabu,김갑진 한국고분자학회 2016 Macromolecular Research Vol.24 No.8
In this study, neat polyvinylidene fluoride (PVDF) and its blend with polyoctafluoropentyl acrylate (POFPA) were electrospun under controlled conditions, and studied for their physico-mechanical and piezo-responsive behaviours. Initial FTIR studies confirmed the effect of thermal annealing on the crystalline phase transformations and chaindipole orientation in PVDF as a function of POFPA content. SEM data exhibited “root-shaped” morphology in the blend sample. Higher tensile strength (65.2±0.4 kPa) for the blend compared to that of neat PVDF (1.5±0.03 kPa) confirmed the elastic nature of the blend nanoweb. Peak-to-peak piezoelectric output signal (Vp-p 0.976 V) and capacitance hysteresis showed reduced tendency, whereas the capacitance maxima is higher for the blend sample (Cmax 0.182 nF) compared to that of neat PVDF (Vp-p 1.195, Cmax 0.147 nF). Overall, even 10 wt% addition of POFPA in PVDF greatly enhanced the tensile strength of nanofiber web along with improved piezocapacitive characteristics, a combination of great potential for many commercial sensor applications.