Ferroelectric Studies On Poly (Vinylidene Fluoride)∕NiFe[sub 2]O[sub 4] Polymer Nanocomposite Structures

2011 ◽  
Author(s):  
T. Prabhakaran ◽  
J. Hemalatha ◽  
Alka B. Garg ◽  
R. Mittal ◽  
R. Mukhopadhyay
Keyword(s):  
Vinylidene Fluoride ◽  
Polymer Nanocomposite ◽  
Poly Vinylidene Fluoride ◽  
Nanocomposite Structures

Electrospun Poly(vinylidene fluoride-trifluoroethylene)-Based Polymer Nanocomposite Fibers for Piezoelectric Nanogenerators

2019 ◽  
Vol 11 (43) ◽  
pp. 40180-40188 ◽  
Author(s):  
Subash Cherumannil Karumuthil ◽  
Sreenidhi Prabha Rajeev ◽  
Uvais Valiyaneerilakkal ◽  
Sujith Athiyanathil ◽  
Soney Varghese
Keyword(s):  
Vinylidene Fluoride ◽  
Polymer Nanocomposite ◽  
Poly Vinylidene Fluoride ◽  
Nanocomposite Fibers ◽  
Piezoelectric Nanogenerators

Improving the dielectric properties of poly(vinylidene fluoride) composites by using poly(vinyl pyrrolidone)-encapsulated polyaniline nanorods

2016 ◽  
Vol 4 (7) ◽  
pp. 1504-1510 ◽  
Author(s):  
Shuangmin Yu ◽  
Fan Qin ◽  
Gengchao Wang
Keyword(s):  
High Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Polymer Nanocomposite ◽  
Vinyl Pyrrolidone ◽  
Low Dielectric ◽  
Poly Vinylidene Fluoride ◽  
Poly Vinyl Pyrrolidone ◽  
High Dielectric ◽  
Polyaniline Nanorods ◽  
Dielectric Polymer

A promising PVDF-based dielectric polymer nanocomposite based on easily dispersed and poly(vinyl pyrrolidone)-encapsulated polyaniline nanorods (dPANI@PVP) was fabricated and displayed a high dielectric constant and low dielectric loss.

Fabrication and Characterization of CoFe2O4-Polymer Nanocomposite Thin-Films

2013 ◽  
Vol 1507 ◽  
Author(s):  
Xiaohua Liu ◽  
Shuangyi Liu ◽  
Stephen O’Brien
Keyword(s):  
Thin Films ◽  
Magnetic Particles ◽  
Cobalt Ferrite ◽  
Vinylidene Fluoride ◽  
Structural Information ◽  
Effective Permittivity ◽  
Polymer Nanocomposite ◽  
Magnetic Devices ◽  
Nanocomposite Thin Films ◽  
Poly Vinylidene Fluoride

ABSTRACTMagnetic cobalt ferrite nanoparticles provide a pathway towards nanocomposites, due to the ability to fabricate particle-matrix thin films in the submicron range. In this work flexible particulate 0-3 type thin-films, composed of magnetic CoFe2O4 particles (8-18 nm) and ferroelectric poly(vinylidene fluoride-co-hexafluoropropene) (P(VDF-HFP)) polymer, have been fabricated via multiple spin-coating. The thickness of the thin-films was controlled in the range of 500 nm to 1.2 μm, with magnetic particles dispersively embedded in the polymer matrix. Structural information was analyzed by TEM, XRD, HRTEM and SEM. The dielectric and magnetic properties of the cobalt ferrite/copolymer thin films are systematically investigated. The nanocomposite thin films exhibit composition-dependent effective permittivity and loss tangent, as well as temperature and composition-dependent specific saturation magnetization (Ms). The coercivity (Hc) was not affected by the composite’s composition. These films have great potential in smart magnetic devices and biomagnetic applications.

Exploring the Structural and Dielectric Properties of Polymer Films Incorporating Carbon-Based Nanomaterials

2021 ◽  
Vol 20 (02) ◽  
pp. 2150019
Author(s):  
A. Deepak ◽  
Pheba Cherian ◽  
D. F. L. Jenkins
Keyword(s):  
Vinylidene Fluoride ◽  
Tunneling Current ◽  
Polymer Nanocomposite ◽  
Wide Frequency Range ◽  
Nanocomposite Films ◽  
Host Matrix ◽  
Weight Percentage ◽  
Poly Vinylidene Fluoride ◽  
Electrical Permittivity ◽  
Carbon Based Nanomaterials

This work explores the electrical, dielectric and physical characteristics of multi-walled carbon nanotube (MWCNT) and graphene reinforced Poly vinylidene fluoride (PVDF) polymer nanocomposite films, over a wide frequency range, ranging from 1 Hz to 1 MHz. Films are prepared with different weight percentage of MWCNTs or graphene powder within a PVDF host matrix and its intrinsic properties are compared with pure PVDF films. As the weight percentage increases, the material properties such as conductivity (electrical), permittivity (dielectric) and capacitance (dielectric) will change. PVDF is a dielectric and the fillers are conductors, and this gives rise to the phenomenon of percolation, as the weight percentage of conducting fillers increases. This paper explores film’s properties for different weight percentage of MWCNTs and graphene fillers. Tunneling current of graphene–PVDF films are also compared with MWCNT–PVDF films.

Preparation and characterization of poly(vinylidene fluoride-trifluoroethylene)/barium titanate polymer nanocomposite for ferroelectric applications

2015 ◽  
Vol 38 (8) ◽  
pp. 1655-1661 ◽  
Author(s):  
Uvais Valiyaneerilakkal ◽  
Amit Singh ◽  
C.K. Subash ◽  
Kulwant Singh ◽  
S.M. Abbas ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Vinylidene Fluoride ◽  
Polymer Nanocomposite ◽  
Poly Vinylidene Fluoride

scholarly journals Enhancement of the piezoelectric coefficient in PVDF-TrFe/CoFe2O4 nanocomposites through DC magnetic poling

2021 ◽  
Vol 12 ◽  
pp. 1262-1270
Author(s):  
Marco Fortunato ◽  
Alessio Tamburrano ◽  
Maria Paola Bracciale ◽  
Maria Laura Santarelli ◽  
Maria Sabrina Sarto
Keyword(s):  
Piezoelectric Coefficient ◽  
Vinylidene Fluoride ◽  
Piezoelectric Materials ◽  
Low Cost ◽  
Wearable Sensors ◽  
Polymer Nanocomposite ◽  
Sample Surface ◽  
Β Phase ◽  
Phase Alignment ◽  
Poly Vinylidene Fluoride

In the last years flexible, low-cost, wearable, and innovative piezoelectric nanomaterials have attracted considerable interest regarding the development of energy harvesters and sensors. Among the piezoelectric materials, special attention has been paid to electroactive polymers such as poly(vinylidene fluoride) (PVDF) and its copolymer poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFe), which is one of the most extensively investigated piezoelectric polymers, due to the high β phase content resulting from specific curing or processing conditions. However, to obtain a high piezoelectric coefficient (d33) alignment of the β phase domains is needed, which is usually reached through applying a high electric field at moderate temperatures. This process, usually referred to as electrical poling, requires the deposition of contact electrodes on the sample surface and the use of high-voltage apparatus. In the present work, in order to overcome these constraints, we have produced, characterized, and studied a polymer nanocomposite consisting of CoFe2O4 nanoparticles dispersed in PVDF-TrFe with enhancement of the β phase alignment through an applied DC magnetic field. The magnetic poling was demonstrated to be particularly effective, leading to a piezoelectric coefficient d33 with values up to 39 pm/V. This type of poling does not need the use of a top electrode or of high magnetic fields (the maximum value of d33 was obtained at 50 mT, using a current of 0.4 A) making the PVDF-TrFE/CoFe2O4 nanocomposite suitable for the fabrication of highly efficient devices for energy harvesting and wearable sensors.

scholarly journals Polymer Blend Containing MoO3 Nanowires with Antibacterial Activity against Staphylococcus epidermidis ATCC 12228

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Urška Gradišar Centa ◽  
Petra Kocbek ◽  
Anna Belcarz ◽  
Srečo D. Škapin ◽  
Maja Remškar
Keyword(s):  
Antibacterial Activity ◽  
Staphylococcus Epidermidis ◽  
Vinylidene Fluoride ◽  
Protective Coatings ◽  
Polymer Nanocomposite ◽  
Water Soluble ◽  
Poly Vinylidene Fluoride ◽  
Poly Ethylene Oxide ◽  
Size And Morphology ◽  
Poly Ethylene

Antibacterial activity of a polymer nanocomposite containing water-soluble poly(ethylene oxide) (PEO), water insoluble poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and MoO3 nanowires or MoO3 microparticles as antibacterial active substances is reported. The UV-vis absorption method was used for the illumination of dissolving of the MoO3 particles of different size and morphology in water. Dissolving of MoO3 nanowires (1 mg ml-1) decreases pH bellow 3.6 in only 3 min and below 3 in 15 min, while dissolving of the PEO/PVDF-HFP/MoO3 nanowires coating (5 mg ml-1) decreases pH bellow 3.6 in 90 min. These coatings completely destroy the Staphylococcus epidermidis ATCC 12228 bacterial strain within 3 h. The proposed applications are antibacterial protective coatings of contact surfaces.

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