scholarly journals POLYVINYLIDENE FLUORIDE AND ZINC OXIDE SMART COMPOSITE MATERIAL

2012 ◽  
pp. 22-27
Author(s):  
S.S. SAWALE ◽  
P.S. SAWALE
Keyword(s):  
Zinc Oxide ◽  
Composite Material ◽  
Polymer Solution ◽  
Polyvinylidene Fluoride ◽  
Ceramic Materials ◽  
Material System ◽  
Free Standing ◽  
Composite Pellets ◽  
Alternative Processes ◽  
Electromechanical Characterization

This work aimed at fabrication and electromechanical characterization of a smart material system composed of electroactive polymer and ceramic materials. The idea of composite material system is on account of complementary characteristics of the polymer and ceramic for flexibility and piezoelectric activity. Our preliminary work included Polyvinylidene Fluoride (PVDF) as the flexible piezoelectric polymer, and Zinc Oxide (ZnO) as the piezoelectric ceramic brittle, but capable to respond strains without poling. Two alternative processes were investigated. The first process makes use of ZnO fibrous formation achieved by sintering PVA/zinc acetate precursor fibers via electrospinning. Highly brittle fibrous ZnO mat was dipped into a PVDF polymer solution and then pressed to form pellets. The second process employed commercial ZnO nanopowder material. The powder was mixed into a PVDF/acetone polymer solution, and the resultant paste was pressed to form pellets. The free standing composite pellets with electrodes on the top and bottom surfaces were then subjected to sinusoidal electric excitation and response was recorded using a fotonic sensor. An earlier work on electrospun PVDF fiber mats was also summarized here and the electromechanical characterization is reported.

Flexible and free-standing films containing cobalt-doped nanocrystalline zinc oxide dispersed in polyvinylidene fluoride matrix: synthesis and characterization

2017 ◽  
Vol 75 (1) ◽  
pp. 307-325 ◽  
Author(s):  
Rajkumar Dey ◽  
Ritamay Bhunia ◽  
Shamima Hussain ◽  
Bibhash Ranjan Chakraborty ◽  
Radhaballav Bhar ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Polyvinylidene Fluoride ◽  
Synthesis And Characterization ◽  
Matrix Synthesis ◽  
Free Standing ◽  
Nanocrystalline Zinc Oxide

Solidification characteristics of polymer solution during polyvinylidene fluoride membrane preparation by nonsolvent-induced phase separation

2013 ◽  
Vol 438 ◽  
pp. 77-82 ◽  
Author(s):  
Toru Ishigami ◽  
Keisuke Nakatsuka ◽  
Yoshikage Ohmukai ◽  
Eiji Kamio ◽  
Tatsuo Maruyama ◽  
...  
Keyword(s):  
Phase Separation ◽  
Polymer Solution ◽  
Polyvinylidene Fluoride ◽  
Membrane Preparation

scholarly journals Effect of LiNbO3 on the Electrocaloric Performance of 0.94BNT-0.06BT Ceramic Materials

2021 ◽  
Author(s):  
Jing Chen ◽  
lei Wu ◽  
Luanfan Duan ◽  
Dongren Liu
Keyword(s):  
Ceramic Material ◽  
Room Temperature ◽  
Ceramic Materials ◽  
Adiabatic Temperature ◽  
Cooling Effect ◽  
Material System ◽  
Temperature Changes ◽  
Cooling Temperature ◽  
Temperature Range

Abstract Considering that the electric refrigeration temperature range of 0.94BNT-0.06BT ceramic materials is 100 ~ 140℃, the electric refrigeration performance of the 0.94BNT-0.06BT ceramic material system was modified by LiNbO3 doping to reduce the cooling temperature. As a result, the refrigeration temperature range of the 0.94BNT-0.06BT ceramic material system was lowered to 25 ~ 80℃, achieving its cooling effect near room temperature, and in this temperature range, the adiabatic temperature changes ∆T > 0.6K.

scholarly journals Piezoelectric Properties of Zinc Oxide/Iron Oxide filled Polyvinylidene fluoride Nanocomposite Fibers

2021 ◽  
Author(s):  
Abdulrahman Mohmmed AlAhzm ◽  
Maan Omar Alejli ◽  
Deepalekshmi Ponnamma ◽  
Yara Elgawady ◽  
Mariam Al Ali Al-Maadeed
Keyword(s):  
Zinc Oxide ◽  
Iron Oxide ◽  
Polyvinylidene Fluoride ◽  
Output Voltage ◽  
Mechanical Energy ◽  
Scanning Calorimetry ◽  
Power Sources ◽  
Hybrid Nanomaterial ◽  
Β Phase ◽  
Nanocomposite Fibers

Abstract Piezoelectric nanogenerators (PENG) with flexible and simple design have pronounced significance in fabricating sustainable devices for self-powering electronics. This study demonstrates the fabrication of electrospun nanocomposite fibers from polyvinylidene fluoride (PVDF) filled Zinc Oxide (ZnO)/Iron Oxide (FeO) nanomaterials. The nanocomposite fiber based flexible PENG showed piezoelectric output voltage of 5.9 V when 3 wt.% of ZnO/FeO hybrid nanomaterial was introduced, which was 29.5 times higher than the neat PVDF. No apparent decline in output voltage was observed for almost 2000 seconds attributed to the outstanding durability. This higher piezoelectric output performance is correlated with the β-phase transformation studies from the Fourier transformation infrared spectroscopy and the crystallinity studies from the differential scanning calorimetry. Both these studies show respective enhancement of 3.79 and 2.16 % in the β-phase crystallinity values of PVDF-ZnO/FeO 3 wt.% composite. Higher dielectric constant value obtained for the same composite (3 times higher than the neat PVDF) confirms the increased energy storage efficiency as well. Thus the proposed soft and flexible PENG is a promising mechanical energy harvester, and its good dielectric properties reveals the ability to use this material as good power sources for wearable and flexible electronic devices.

Mechanical energy harvesting properties of free-standing carbyne enriched carbon film derived from dehydrohalogenation of polyvinylidene fluoride

Nano Energy ◽  
2019 ◽  
Vol 59 ◽  
pp. 453-463 ◽  
Author(s):  
Karthikeyan Krishnamoorthy ◽  
Vimal Kumar Mariappan ◽  
Parthiban Pazhamalai ◽  
Surjit Sahoo ◽  
Sang-Jae Kim
Keyword(s):  
Energy Harvesting ◽  
Polyvinylidene Fluoride ◽  
Mechanical Energy ◽  
Carbon Film ◽  
Free Standing

Fabrication of free-standing pure carbon-based composite material with the combination of sp2–sp3 hybridizations

2014 ◽  
Vol 308 ◽  
pp. 211-215 ◽  
Author(s):  
M. Varga ◽  
V. Vretenar ◽  
M. Kotlar ◽  
V. Skakalova ◽  
A. Kromka
Keyword(s):  
Composite Material ◽  
Free Standing ◽  
Pure Carbon ◽  
Carbon Based

The Comparative Analysis of the Non-Symmetric Thermal Shock Crack Propagation in Al2O3 and ZrO2 Bars

2006 ◽  
Vol 45 ◽  
pp. 1640-1645 ◽  
Author(s):  
Tomasz Sadowski ◽  
Zdzislaw Librant ◽  
Marek Boniecki
Keyword(s):  
Composite Material ◽  
Crack Propagation ◽  
Thermal Shock ◽  
Problem Formulation ◽  
Ceramic Materials ◽  
Theoretical Modelling ◽  
Theoretical Problem ◽  
Mechanical And Thermal Properties ◽  
Intensity Factors ◽  
Thermal Shock Problem

The aim of the paper is theoretical modelling and experimental verification of the nonsymmetric thermal shock crack propagation in compound ceramic Al2O3 and ZrO2. The theoretical problem formulation concerns the thermal shock problem in a strip or bar made of nonhomogeneous material, which can exhibit local fluctuation of its mechanical and thermal properties. Such approach allows for: analysis of the real non-homogeneous ceramic materials and solution of the composition optimisation problem for composite material with respect to thermal shock sensitivity. In particular the presented approach enables estimation of the stress intensity factors during thermal shock for any continuous composition of the ceramic material.

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