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Feng Y.,Jiangsu University | Shen X.,Jiangsu University | Guo L.,Jiangsu University | Song H.,Jiangsu University | Pan T.,Pant Piezoelectric Company
Polymer Composites | Year: 2010

Based on the model for 0-3 piezoelectric composites without an interlayer, a modified model for 0-3 piezoelectric composites with an interlayer has been proposed and the expressions for this model consequently have been derived. The interlayer is supposed to act as a bridge between the ceramic and polymer matrix during the poling process. The calculated results show that the electric field strength on ceramic phase is influenced by the volume fraction of interlayer and ceramic in the composite, and dielectric constants of interlayer, ceramic, and polymer matrix. The electric field strength on ceramic phase increases with the interlayer volume fraction and dielectric constant ratio of interlayer and polymer matrix. This indicates that the ceramic polarization and piezoelectric performance of 0-3 piezoelectric composites can be improved by design of the interlayer with appropriate dielectric constants and volume fractions into the 0-3 piezoelectric composites. POLYM. © 2010 Society of Plastics Engineers. Source


Pang S.L.,Jiangsu University | Xie D.S.,Jiangsu University | Shen X.Q.,Jiangsu University | Zhu L.,Jiangsu University | Pan T.Z.,Pant Piezoelectric Company
Advances in Energy Science and Equipment Engineering - Proceedings of International Conference on Energy Equipment Science and Engineering, ICEESE 2015 | Year: 2015

The high thermal conducting composites with low filler content are of critical importance in developing high-performance thermal interface materials. In this work, the thermal conductive silicone rubber composites with a low volume fraction (≤4.58%) of Carbon Nanotubes (CNTs) and magnetic nickel microfibers hybrid filler were prepared by the simple mixing and curing process at room temperature. A remarkable enhancement in thermal conductivity was observed for the composites cured under an external magnetic field of ~0.5 T. This improvement in thermal conductivity can be attributed to the conductive network formation of CNTs-nickel microfibers induced by the external magnetic field. © 2015 Taylor & Francis Group, London. Source


Han P.,Jiangsu University | Pang S.,Jiangsu University | Fan J.,Pant Piezoelectric Company | Shen X.,Jiangsu University | Pan T.,Pant Piezoelectric Company
Sensors and Actuators, A: Physical | Year: 2013

Piezoelectric oxides Pb1-xLax(ZryTi 1-y)1-x/4O3 (PLZT) were synthesized by the solid-state reaction process and Pb0.96La0.04(Zr 0.54Ti0.46)0.99O3/polyvinylidene fluoride (PL0.04ZT/PVDF), Pb0.92La0.07(Zr 0.555Ti0.445)0.9825O3/PVDF (PL 0.07ZT/PVDF) composites with various particle sizes and contents (50-90 vol.%) of the ceramic phase were prepared by the hot-press process. The Curie temperature (Tc) of PLZT decreases monotonously from 312 C to 98 C with La content (x) increasing from 0.02 to 0.09. The polarizability of PLZT/PVDF composites increases from 39.5% (PL0.04ZT/PVDF) to 56.7% (PL0.07ZT/PVDF) when poled at 125 C (at the vicinity of Tc of PL0.07ZT). As a result, the electrical property improvement with d33 (Ér) from 53 pC/N (159) to 76 pC/N (222) proves that tailoring Tc of the piezoelectric ceramic to the poling temperature is a useful way to enhance the piezoelectric and dielectric properties of the ceramic/polymer composite. To further investigate the electrical properties of the 0-3 type PLZT/PVDF composite, the particle size and volume fraction of PLZT are also optimized. © 2013 Elsevier B.V. All rights reserved. Source


Han P.,Jiangsu University | Fan J.,Jiangsu University | Fan J.,Pant Piezoelectric Company | Zhu L.,Jiangsu University | And 3 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2012

The reduced graphene/poly(vinylidene fluoride) nanocomposite films were prepared by the solution casting-thermal reduction process using graphene oxide (GO) and poly(vinylidene fluoride) (PVDF) resin. With the presence of reduced graphene (RG) nano sheets in the nanocomposite, the structure of PVDF is transformed from α to β phase, and the β phase fraction and its crystallinity are largely affected by the RG content. The PVDF thermal stability is improved by the RG introduction, with about 15 °C increase of the half-life of PVDF decomposition temperature. The RG/PVDF nanocomposites show a better electrical conductivity than that for the GO/PVDF nanocomposites. At a low RG content (0.8 wt.%), the dielectric constant of RG/PVDF nanocomposite film with a very low loss tangent is dramatically increased from about 6 to 23. The mechanisms for the thermal stability and electrical property improvements are discussed. Copyright © 2012 American Scientific Publishers All rights reserved. Source

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