Phase transformation of poly (vinylidene difluoride) in energy harvesting

Liang, Hong; Cooper, Rodrigo; Files, Jason

doi:10.1557/jmr.2010.81

Cited by 10 publications

(4 citation statements)

References 32 publications

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“…PVDF is partially crystalline and known to exist in α, β, γ, δ, and ε polymorphs. − There are 3 main chain conformations. The α-phase is nonpolar and has a (TGTG′) conformation, where T is trans and G is gauche . − The other main chain conformations are the γ phase with a TTTGTTTG′ polar structure − and β polymorph with an all trans (TTT) conformation.…”

Section: Resultsmentioning

confidence: 99%

Functional Hollow Fiber Adsorbent Materials with a Self-Regulating Composite Outer Layer for Gas Purification with Energy Efficient Electrothermal Regeneration

Bell

Angus²,

Todd³

et al. 2013

Ind. Eng. Chem. Res.

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Hollow fiber adsorbents have potential to overcome high pressure drop, adsorbent bed settling, and channeling problems in fixed bed adsorption systems. A coaxial spinning method was used for the synthesis of hollow fibers with an outer layer of electrically conducting polyvinylidene fluoride/carbon black composite with a positive temperature coefficient of resistivity and an inner layer of zeolite 13X/polyethersulphone adsorbent. The outer layer was optimized for self-limiting/regulating alternating current (AC) electrothermal regeneration. A fiber cartridge was constructed for studying the dynamic breakthrough and adsorbent regeneration characteristics. The breakthrough results for water vapor adsorption were analyzed by Wheeler–Jonas, Linear Driving Force (LDF) and Richards sigmoidal models. The isosteric enthalpy and kinetics for adsorption were determined for static vapor adsorption. The LDF adsorption kinetics observed at low surface coverage change to a stretched exponential kinetic model with increasing surface coverage. Intraparticle diffusion in the zeolite crystalline porous structure was rate-determining for water vapor breakthrough characteristics.

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Section: Resultsmentioning

confidence: 99%

Functional Hollow Fiber Adsorbent Materials with a Self-Regulating Composite Outer Layer for Gas Purification with Energy Efficient Electrothermal Regeneration

Bell

Angus²,

Todd³

et al. 2013

Ind. Eng. Chem. Res.

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“…Research and development of new materials with high energy dissipation density is one of the key approaches to promote the automotive crash safety 1, 2. Conventional energy dissipation materials and structures based on metal plastic deformation,3 buckling of cellular truss or foam,4 damping of polymers,5 internal friction of textile composites,6 and phase transformation7 are employed to achieve the energy desired dissipation goal. Most materials developed so far, however, have relatively low energy dissipation performance in terms of the unit mass/volume consideration, and most of them are not reusable.…”

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confidence: 99%

Experimental Study on Energy Dissipation Characteristics of ZSM‐5 Zeolite/Water System

Sun

et al. 2013

Adv Eng Mater

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Research and development of new materials with high energy dissipation density is one of the key approaches to promote the automotive crash safety. [1,2] Conventional energy dissipation materials and structures based on metal plastic deformation, [3] buckling of cellular truss or foam, [4] damping of polymers, [5] internal friction of textile composites, [6] and phase transformation [7] are employed to achieve the energy desired dissipation goal. Most materials developed so far, however, have relatively low energy dissipation performance in terms of the unit mass/volume consideration, and most of them are not reusable. Therefore, reusable, high-density energy dissipation material candidates are in pressing need for industries.Nanomaterial is considered and proven to be a promising alternative to these traditional materials, [8][9][10][11] among which an innovative nanoporous material energy absorption system (NEAS) was recently established [12] where a nanoporous material and liquid are combined with controllable wetting properties. In essence, NEAS takes advantage of the ultralarge surface area of nanoporous material and during the liquid infiltration process, it converts the external mechanical energy into the excessive solid-liquid interfacial energy and frictional heat. The wetting characteristic, which dominates the infiltration/defiltration and flow behaviors of liquid molecules, can be adjusted via various approaches, including COMMUNICATIONInteraction with liquids at the ultra-large surface area of nanoporous material enables a high-efficiency energy dissipation system with wide perspective applications [A. Han, et al., Langmuir 2008, 24, 7044]. In this paper, a nanoporous energy dissipation system composed of a mixture of zeolite ZSM-5 and water is established and studied experimentally. Firstly, quasi-static compression experiments are carried out to analyze the pressure-volume curve and reveal the energy dissipation mechanism. Afterwards, a parametric study is conducted to explore the effects of three parameters, the pretreatment temperature of zeolite ZSM-5 (600-1100 8C), mass ratio of ZSM-5 to water (1:5-6:5), and average zeolite particle size (2.145-5.251 mm before heated or 6.104-9.557 mm after heated). Results show that in order to obtain optimum energy absorption performance, the pretreatment temperature of about 1000 8C, and higher ratio of ZSM-5 with larger particle size are desired. With high energy dissipation and reusability, the zeolite-water system with optimal parameters established herein may become an attractive cushioning device. 740 wileyonlinelibrary.com ß

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“…The problem in developing a new material that has high figure of merit (i.e., high conversion efficiency) is the direct dependence of these parameters on each other. Last decades scientist found a suitable way to enhance one or two of these parameters independently on the other parameters using quantum effect that been formed in different shapes of nano materials (Hsu et al 2004;Sales 2007;Pichanusakorn and Bandaru 2010;Gibson 2010;Liang et al 2011). …”

Section: Introductionmentioning

confidence: 99%

Enhance the figure of merit for flexible thermoelectric materials by reducing the screening effect

Ismail

Hussein

2017

Appl Nanosci

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A flexible thermoelectric materials (FTEM) films based on Polydimethylsiloxane as the polymer matrix and (Zinc Oxide, Polyaniline and multi wall Carbon nanotube) as the fillers were prepared. The fillers were prepared using modified sol-gel method to enhance the distribution of the nanoparticles inside the polymer matrix and good performance. The Seebeck coefficient, electrical conductivity, thermal conductivity and dielectric measurements were carried out for all of the four films. The Seebeck coefficient results for the investigated films were -40, 220, -120, 280 lv/k°at 200°C for FTEM 1, 2, 3, 4 alternatively. The sign and the value for the Seebeck measurements show a great dependent on the filler type add to the film. The electrical conductivity results for the films was varied from 2 9 10 -8 to 0.14 S/m and strongly dependent on the fillers electrical conductivity. The less dependent on the thermal conductivity of the fillers and a slight change in the thermal conductivity value of the films were obtained. The figure of merit for the films was ranged from 1.14 9 10 -16 to 3.134 9 10 -8 . The dielectric results ranged from 4 to 3500. Reducing the screening effect will increase the electrical conductivity and Seebeck coefficient values.

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Phase transformation of poly (vinylidene difluoride) in energy harvesting

Abstract: Abstract

Cited by 10 publications

References 32 publications

Functional Hollow Fiber Adsorbent Materials with a Self-Regulating Composite Outer Layer for Gas Purification with Energy Efficient Electrothermal Regeneration

Functional Hollow Fiber Adsorbent Materials with a Self-Regulating Composite Outer Layer for Gas Purification with Energy Efficient Electrothermal Regeneration

Experimental Study on Energy Dissipation Characteristics of ZSM‐5 Zeolite/Water System

Enhance the figure of merit for flexible thermoelectric materials by reducing the screening effect

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