scholarly journals The Effect of CoFe2O4, CuFe2O4 and Cu/CoFe2O4 Nanoparticles on the Optical Properties and Piezoelectric Response of the PVDF Polymer.

2021 ◽  
Author(s):  
Mai EL-Masry ◽  
Rania Ramadan
Keyword(s):  
Optical Properties ◽  
Polyvinylidene Fluoride ◽  
Interfacial Polarization ◽  
Nanocomposite Films ◽  
Piezoelectric Response ◽  
Copper Ferrite ◽  
Characterization Methods ◽  
Casting Technique ◽  
Solution Casting Technique ◽  
Pure Pvdf

Abstract Cobalt ferrite, Copper ferrite and cobalt doped copper ferrite nanoparticles have been synthesized and characterized using different characterization methods (XRD, FTIR and FESEM). The prepared nanoparticles have been used as promising fillers of the polyvinylidene fluoride (PVDF) polymer. The PVDF/(Cu-CoFe2O4, CoFe2O4, and CuFe2O4) nanocomposites films have been prepared via a simple solution casting technique. The optical properties and the piezoelectric response of the prepared nanocomposite films have been studied. The study showed that Cu-CoFe2O4, CoFe2O4, and CuFe2O4 have enhanced the interfacial polarization density and dielectric constant. The optical conductivity value of PVDF/ (Cu-CoFe2O4 and CoFe2O4) increased five times compared with the pure PVDF. Also, an increase in the piezoelectric response has been recorded by adding the nano-fillers to the pure PVDF.

Surface, Temperature and Optical Properties Pd-TiO2 Doped PVA Nanocomposite

2019 ◽  
Vol 962 ◽  
pp. 77-81
Author(s):  
B. Guruswamy ◽  
V. Ravindrachary ◽  
C. Shruthi ◽  
M. Mylarappa ◽  
G.O. Obaiah
Keyword(s):  
Optical Properties ◽  
Thermal Properties ◽  
Nanocomposite Films ◽  
Solution Casting ◽  
Absorption Method ◽  
Casting Technique ◽  
Solution Casting Technique ◽  
Modified Surface ◽  
Uv Visible ◽  
Effect Of Pd

The effect of Pd-TiO2 nanoparticle doping on structural, optical and thermal properties of the PVA polymer has been investigated using FTIR, UV-Visible, TGA and FESEM analysis. nanosized Pd-TiO2 particles were synthesized using standard method. Pure and Pd-TiO2/PVA nanocomposite films were prepared using solution casting technique. The FTIR study confirmed that the Pd-TiO2 nanoparticles interacts with the OH group of PVA polymer and forms the complex. The presence of these complexes affects the optical and thermal properties the composite. The change in the optical properties was studied using UV-Vis absorption method. The effect of doping on the thermal properties was studied using TGA method and the modified surface morphology using FESEM.

Bioactivity Assessment of Apatite Nuclei-PVDF Composite Thin Films

2018 ◽  
Vol 782 ◽  
pp. 78-83
Author(s):  
Hasnat Zamin ◽  
Takeshi Yabutsuka ◽  
Shigeomi Takai
Keyword(s):  
Thin Films ◽  
Calcium Phosphate ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Polyvinylidene Fluoride ◽  
Solution Casting ◽  
Casting Technique ◽  
Doctor Blade ◽  
Solution Casting Technique ◽  
Hydroxyapatite Formation

Particles of calcium phosphate were precipitated by raising the temperature and the pH of simulated body fluid (SBF) named Apatite Nuclei (AN). AN and polyvinylidene fluoride (PVDF) composites thin films with different weight percentages of AN in PVDF were fabricated by solution casting technique, using doctor blade method. In order to assess the bioactivity, the thin films were soaked in simulated body fluid (SBF). It was found that the film containing 30 wt.% of AN in PVDF actively induced hydroxyapatite formation in 3 days soaking period in SBF.

Characterization of Polyvinyl Acetate/Multi Walled Carbon Nanotube Nanocomposites

2016 ◽  
Vol 721 ◽  
pp. 13-17
Author(s):  
Juris Bitenieks ◽  
Remo Merijs Meri ◽  
Janis Zicans ◽  
Mārtiņš Kalniņš
Keyword(s):  
Polyvinyl Acetate ◽  
Nanocomposite Films ◽  
Solution Casting ◽  
Casting Technique ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Solution Casting Technique ◽  
Dielectrical Properties ◽  
Walled Carbon Nanotubes

Nanocomposite films from polyvinyl acetate (PVAc) dispersion and multi walled carbon nanotubes (MWCNTs) were prepared by solution casting technique. Stress-strain properties showed increase in elastic modulus and yield strength. Mechanical properties characterized by dynamic mechanical thermal analysis represented increase in storage modulus below glass transition temperature. Studied dielectrical properties of PVAc/MWCNT nanocomposites revealed formation of conductive MWCNT network in PVAc matrix.

scholarly journals Structural, Thermal and Optical Properties of PMMA, PEO and PMMA/PEO/LiClO4 Polymer Electrolyte Blends

2017 ◽  
Vol 14 (2) ◽  
pp. 123-127 ◽  
Author(s):  
M. Ravindar Reddy ◽  
M. Jaipal Reddy ◽  
A. R. Subrahmanyam
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Polymer Blend ◽  
Xrd Analysis ◽  
Pure Pmma ◽  
Scanning Calorimetry ◽  
Casting Technique ◽  
Interaction Interface ◽  
Solution Casting Technique ◽  
Polymer Blend Electrolyte

This paper is a report of a study conducted on Structural, thermal and optical Properties of pure PMMA, pure PEO and PMMA-PEO-LiClO4 polymer blend electrolyte thin films. These films were prepared using solution casting technique and characterized by X-ray Diffractometer (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC). XRD analysis Observations confirmed that amorphous, crystalline and semi crystalline nature of pure PMMA, pure PEO and PMMA-PEO-LiClO4 polymer blend electrolyte thin films the SEM micrographs suggest that the surface morphology of pure PEO changes from smooth to rough when PMMA and LiClO4 added to PEO polymer, which shows the interaction/ interface between the two polymers and polymer blend electrolyte due to cross – linking. Glass transition (Tg) and melting temperatures (Tm) of pure PMMA, pure PEO and PMMA-PEO-LiClO4 polymer blend electrolyte thin films were confirmed by DSC analysis. FTIR spectra confirmed that complex formation and interaction among PMMA, PEO polymers and LiClO4 salt.

scholarly journals Optical And Electrical Properties of PVA/A-Al2O3 Nanocomposite Films

2019 ◽  
Vol 16 (1) ◽  
pp. 280-298
Author(s):  
Sara El-Molla ◽  
R. Mahmoud ◽  
A.F. Mansour ◽  
S.F. Mansour ◽  
M.A. Abdo
Keyword(s):  
Electron Microscopy ◽  
Interfacial Polarization ◽  
Combustion Method ◽  
Nanocomposite Films ◽  
Al2o3 Content ◽  
Al2o3 Nanoparticles ◽  
Ac Electrical Conductivity ◽  
Casting Technique ◽  
Auto Combustion ◽  
Uv Visible

In the present study, a-Al2O3 nanoparticles were synthesized using the citrate-nitrate auto combustion method. Nanocomposites of PVA/a-Al2O3 were intended by solution casting technique. The micrograph of samples were analysed by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM) and UV-visible spectroscopy analysis. UV-visible results showed that the direct optical band gap decreased with the increase of a-Al2O3 content. The refractive index has been dissected using Wemple and DiDomenico model. Hopping of charge carriers besides interfacial polarization could expound the demeanor of dielectric constant (E'), dielectric loss (E'') and ac electrical conductivity (0-ac) with the frequency and temperatures.

Preparation of Degradable Sago Starch Film Incorporated with Zinc Oxide (ZnO) Nanoparticles for Enhanced Chemical Barrier and Mechanical Properties

2018 ◽  
Vol 792 ◽  
pp. 104-110
Author(s):  
Jasmine Sim Pei Chieh ◽  
Bazlul Mobin Siddique
Keyword(s):  
Mechanical Strength ◽  
Zno Nanoparticles ◽  
High Surface ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Sago Starch ◽  
Vapour Permeability ◽  
High Mechanical Strength ◽  
Casting Technique ◽  
Solution Casting Technique

The main objective of this study is to reinforce the mechanical strength and water resistance abilities of sago starch biopolymer by incorporating ZnO nanofillers. The biopolymer based nanocomposite films were cast utilizing different weight percentages of ZnO nanofillers (0, 1, 3 or 5 wt%) in sago starch matrix through solution casting technique. Uniform dispersing of ZnO nanofillers throughout the sago starch matrix was achieved by sonication and also to prevent the formation of ZnO nanoparticles aggregates. This was to further reinforce the chemical barrier properties of the film The results illustrated that with the increase of loading of ZnO nanoparticles from 0 to 5 wt%, the tensile strength and elastic modulus improved from 0.180 to 0.980 MPa and from 3.410 to 6.401 MPa respectively for the films, attributing to the high surface to volume ratios, the high mechanical strength of ZnO nanoparticles and the strong nanofiller-matrix interfacial adhesion. The elongation at break also enhanced owing to the slippage of ZnO nanofillers and the oriented sago starch polymer which activated the shear flow of the sago starch polymer. Sago starch nanocomposites with ZnO loadings varied from 0 to 5 wt% demonstrated decreased water vapour permeability from 4.992 × 10−10 g m−1 s−1 Pa−1 to 2.723 × 10−10 g m−1 s−1 Pa−1.

scholarly journals Gas Sensing and Power Harvesting Polyvinylidene Fluoride Nanocomposites Containing Hybrid Nanotubes

2020 ◽  
Vol 49 (4) ◽  
pp. 2677-2687 ◽  
Author(s):  
Deepalekshmi Ponnamma ◽  
Ashok K. Sharma ◽  
Priya Saharan ◽  
Mariam Al Ali Al-Maadeed
Keyword(s):  
Polyvinylidene Fluoride ◽  
Gas Sensing ◽  
Response Times ◽  
Hydrothermal Reaction ◽  
Nanocomposite Films ◽  
Piezoelectric Response ◽  
Filler Materials ◽  
Liquefied Petroleum Gas ◽  
Self Powered ◽  
The Stability

AbstractGas sensing properties at room temperature and energy harvesting performances are realized for the polyvinylidene fluoride (PVDF) nanocomposites containing titanium dioxide (TiO2) nanotubes grown in the presence of carbon nanotubes (CNT). While hydrothermal reaction is practiced for the development of TiO2/CNT hybrid nanotubes, spin coating is done for the nanocomposite films to be deposited on sensing electrodes. Influence of various filler concentrations and the synergistic combination of fillers on the sensing characteristics are studied by recording the response times and the stability of the results. Upon exposure to liquefied petroleum gas, the PVDF/TiO2-CNT (2.5 wt.%) gas sensor shows a sensing response of 0.45 s (400 ppm LPG), approximately nine times higher than the composite containing 2.5 wt.% of TiO2 or 2.5 wt.% CNT. The piezoelectric response of the samples is also recorded and correlated with the synergistic influence of the filler materials. The current study can stimulate a good trend in fabricating self-powered gas sensors from PVDF nanocomposites.

scholarly journals Synthesis of terbium(III) complex with a biscoumarin derivative and its immobilization in PMMA-based composite thin films with fluorescent properties

2013 ◽  
Vol 11 (7) ◽  
pp. 1032-1041 ◽  
Author(s):  
Denitsa Elenkova ◽  
Miroslava Getsova ◽  
Joana Zaharieva ◽  
Ilia Manolov ◽  
Maria Milanova
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Excited State ◽  
Composite Films ◽  
Life Time ◽  
Protective Role ◽  
Nanocomposite Films ◽  
Active Components ◽  
Fluorescent Properties ◽  
Casting Technique

AbstractAn amorphous complex of Tb(III) with the biscoumarin derivative 3,3′-[(4-hydroxyphenyl)methylene)]bis-(4-hydroxy-2H-1-benzopyran-2-one), Tb(H2L)3, was successfully synthesized and characterized. IR- and 1H-NMR-spectroscopy were used to investigate the coordination of the ligand around the Tb(III) ion. Values for the quantum yield and the life time of the excited state of the complex were obtained. The complex was immobilized in transparent and flexible PMMA-based films by a simple casting technique. PMMA/chloroform solutions were used in synthetic procedures that resulted in both glass-supported and self-supporting nanocomposite films. The morphology of the films was studied by scanning electron microscopy, atomic force microscopy and transmission electron microscopy, showing the formation of crack-free films. The presence of the Tb(III) complex in the matrix was proven by the presence of characteristic bands in the IR spectra. Fluorescence microscopy and fluorescence spectroscopy demonstrated the promising optical properties of the films showing the characteristic emission bands of the Tb(III) ions. The longer life time of the excited state of the immobilized complex confirmed the protective role of the PMMA matrix on the optical properties of the complex. The composite films possessing optical properties have the potential for application as active components in optical devices.

scholarly journals Effect of Clay Nanofillers on the Mechanical and Water Vapor Permeability Properties of Xylan–Alginate Films

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2279
Author(s):  
Darrel S. Naidu ◽  
Maya J. John
Keyword(s):  
Optical Properties ◽  
Water Vapor ◽  
Water Sorption ◽  
Food Packaging ◽  
Water Vapor Permeability ◽  
Nanocomposite Films ◽  
Vapor Permeability ◽  
Solvent Casting ◽  
Casting Technique ◽  
Silicate Layers

In this study, xylan–alginate-based films were reinforced with nanoclays (bentonite or halloysite) by the solvent casting technique. The effect of the nanoclay loadings (1–5 wt %) on various properties—mechanical, optical, thermal, solubility, water sorption, and water vapor permeability (WVP)—of the xylan–alginate films were examined for their application as food packaging materials. A 5 wt % loading of either bentonite or halloysite resulted in a 49% decrease of the WVP due to the impermeable nature of the silicate layers that make up both bentonite and halloysite. Thermal stability and solubility of the nanocomposite films were not significantly influenced by the presence of the nanoclays, whereas the optical properties were significantly improved when compared to neat xylan–alginate blend. In general, films reinforced with bentonite exhibited superior mechanical and optical properties when compared to both halloysite-based nanocomposite and neat films.

scholarly journals Effect of Phosphoric Acid Concentration on the Optical Properties of Partially Phosphorylated PVA Complexes

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Asmalina Mohamed Saat ◽  
Mohd Rafie Johan
Keyword(s):  
Optical Properties ◽  
Phosphoric Acid ◽  
Polyvinyl Alcohol ◽  
Absorption Spectra ◽  
Solution Casting ◽  
Casting Technique ◽  
Uv Absorption Spectra ◽  
Solution Casting Technique ◽  
Uv Visible ◽  
Phosphoric Acid Concentration

Partially phosphorylated polyvinyl alcohol (PPVA) films were prepared at five mole ratios of phosphoric acid (PA) using solution casting technique. The optical properties of the PPVA films were examined using UV-visible (UV) and photoluminescence (PL) spectroscopy. The UV absorption spectra reveal that the absorption peaks are blue-shifted with an increase in PA concentration added to the pure PVA. The PL spectra show the presence of peaks which are characteristic of isotactic (389–398, 460–462 nm), syndiotactic (418–420 nm), and atactic (440–446 nm) configurations of the PPVA. The results also show the peak of O–P–O bonding at a wavelength range of 481–489 nm.

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