Synthesis and Characterization of PVDF-Based SWNT/GO Hybrid Films

2012 ◽  
Author(s):  
Nirmal Shankar Sigamani ◽  
Zoubeida Ounaies ◽  
Henry Sodano
Keyword(s):  
Polyvinylidene Fluoride ◽  
Room Temperature ◽  
Breakdown Strength ◽  
Hybrid Nanocomposites ◽  
Hybrid Nanocomposite ◽  
Frequency Range ◽  
Hybrid Films ◽  
Walled Carbon Nanotubes ◽  
Pure Pvdf

Hybrid nanocomposites with single walled carbon nanotubes (SWNT) and graphene oxide (GO) as nanofillers and polyvinylidene fluoride (PVDF) as a polymer were synthesized as potential electronic active polymers (EAPs) with high breakdown strength. A co-solvent method was developed to achieve exfoliation and dispersion of GO in PVDF. The microstructure of the PVDF was found to be predominantly γ phase. Percent crystallinity of PVDF increased due to the addition of the hybrid nanofillers. And, at room temperature, the storage modulus is increased by 56.26% over the pure PVDF. The dielectric constant increased from ∼7 to ∼25 for the hybrid nanocomposites as compared to pure PVDF at 1KHz measurement frequency. Dielectric loss of the hybrid nanocomposite is found less than 0.6 for the frequency range from 20 Hz–1MHz. Electrical conductivity of the hybrid nanocomposite increase by nearly two orders of magnitude at 1KHz when compared to pure PVDF. The effect of the presence of these hybrid nanofillers on microstructure and properties of PVDF are discussed.

scholarly journals Construction of a Three-Dimensional BaTiO3 Network for Enhanced Permittivity and Energy Storage of PVDF Composites

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3585
Author(s):  
Xueqing Bi ◽  
Lujia Yang ◽  
Zhen Wang ◽  
Yanhu Zhan ◽  
Shuangshuang Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Polyvinylidene Fluoride ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Sol Gel ◽  
Three Dimensional ◽  
Low Dielectric ◽  
Energy Storage Properties ◽  
Discharge Energy Density ◽  
Pure Pvdf

Three-dimensional BaTiO3 (3D BT)/polyvinylidene fluoride (PVDF) composite dielectrics were fabricated by inversely introducing PVDF solution into a continuous 3D BT network, which was simply constructed via the sol-gel method using a cleanroom wiper as a template. The effect of the 3D BT microstructure and content on the dielectric and energy storage properties of the composites were explored. The results showed that 3D BT with a well-connected continuous network and moderate grain sizes could be easily obtained by calcining a barium source containing a wiper template at 1100 °C for 3 h. The as-fabricated 3D BT/PVDF composites with 21.1 wt% content of 3D BT (3DBT–2) exhibited the best comprehensive dielectric and energy storage performances. An enhanced dielectric constant of 25.3 at 100 Hz, which was 2.8 times higher than that of pure PVDF and 1.4 times superior to the conventional nano–BT/PVDF 25 wt% system, was achieved in addition with a low dielectric loss of 0.057 and a moderate dielectric breakdown strength of 73.8 kV·mm−1. In addition, the composite of 3DBT–2 exhibited the highest discharge energy density of 1.6 × 10−3 J·cm−3 under 3 kV·mm−1, which was nearly 4.5 times higher than that of neat PVDF.

Synthesis and characterization of an AgI/Ag hybrid nanocomposite with surface-enhanced Raman scattering performance and photocatalytic activity

RSC Advances ◽  
2014 ◽  
Vol 4 (70) ◽  
pp. 37187-37192 ◽  
Author(s):  
Qingli Huang ◽  
Shengping Wen ◽  
Xiashi Zhu
Keyword(s):  
Photocatalytic Activity ◽  
Raman Scattering ◽  
Hybrid Nanocomposites ◽  
Synthesis And Characterization ◽  
Hybrid Nanocomposite ◽  
Surface Enhanced ◽  
Excellent Photocatalytic Activity ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Novel AgI/Ag hybrid nanocomposites with good SERS performance and excellent photocatalytic activity were prepared.

A biodegradable, biocompatible transdermal device derived from carboxymethyl cellulose and multi-walled carbon nanotubes for sustained release of diclofenac sodium

RSC Advances ◽  
2016 ◽  
Vol 6 (23) ◽  
pp. 19605-19611 ◽  
Author(s):  
Barun Mandal ◽  
Dipankar Das ◽  
Arun Prabhu Rameshbabu ◽  
Santanu Dhara ◽  
Sagar Pal
Keyword(s):  
Carbon Nanotubes ◽  
Sustained Release ◽  
Transdermal Delivery ◽  
Carboxymethyl Cellulose ◽  
Room Temperature ◽  
Diclofenac Sodium ◽  
Nanocomposite Hydrogel ◽  
Hybrid Nanocomposite ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

A hybrid nanocomposite hydrogel (CMC–MWCNT) has been fabricated using carboxymethyl cellulose (CMC) and acid-functionalized multi-walled carbon nanotubes (MWCNTs) at room temperature for transdermal delivery of diclofenac sodium.

Characterization and dielectric properties of sodium fluoride doped talc

Clay Minerals ◽  
2014 ◽  
Vol 49 (4) ◽  
pp. 551-558
Author(s):  
S. Gümüştas ◽  
K. Köseoğlu ◽  
E. E. Yalçinkaya ◽  
M. Balcan
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Firing Temperature ◽  
Room Temperature ◽  
Dielectric Measurements ◽  
Frequency Range ◽  
Detailed Characterization ◽  
Circuit Element

AbstractThe purpose of this paper is to determine the effect of NaF and firing temperature on the dielectric properties (dielectric constant and dielectric loss) of talc, which is used in the electrical and electronic industries as a circuit element. A detailed characterization of the samples was made by XRD, FTIR, SEM and TG-DTG methods. Dielectric measurements were performed in the frequency range from 1 MHz to 80 MHz at room temperature. The dielectric constant value increased with an increase in firing temperature due to the removal of polarizable compounds from the talc structure. The higher dielectric constant values were obtained by addition of NaF. The dielectric loss of NaF doped talc decreased with the increase of firing temperature and increased with the increase of the amount of NaF.

Preparation and Characterization of CaCu3Ti4O12 Ceramics by Cold Isostatic Press Forming

2008 ◽  
Vol 368-372 ◽  
pp. 123-125
Author(s):  
Jie Li ◽  
Hao Xue ◽  
Zhao Xian Xiong
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Room Temperature ◽  
Frequency Range ◽  
Cold Isostatic Press ◽  
Temperature Range ◽  
Press Forming ◽  
Conventional Sintering ◽  
Sintering Method

CaCu3Ti4O12 (CCTO) ceramics were prepared by cold isostatic press (CIP) forming combined with the conventional sintering method. The effects of calcining temperature on properties of CCTO ceramics were investigated. The dielectric properties as the function of temperature at typical frequencies were measured in the temperature range from 243 to 363 K. In addition, the dielectric properties and complex impedances at room temperature were analyzed in a frequency range from 20 Hz to 106 Hz. The results showed that CCTO ceramics with dielectric constant higher than 104 were obtained. Compared with the dry press forming, CCTO ceramics prepared by CIP had more homogeneous grains, less porosity and better dielectric properties.

scholarly journals Modification of the Surface Morphology and Properties of Graphene Oxide and Multi-Walled Carbon Nanotube-Based Polyvinylidene Fluoride Membranes According to Changes in Non-Solvent Temperature

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2269
Author(s):  
Jungryeong Chae ◽  
Taeuk Lim ◽  
Hao Cheng ◽  
Wonsuk Jung
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
Polyvinylidene Fluoride ◽  
Water Flux ◽  
Bath Temperature ◽  
Coagulation Bath ◽  
Water Contact ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Pure Pvdf

The effect of changes in non-solvent coagulation bath temperature on surface properties such as morphology and hydrophilicity were investigated in multi-walled carbon nanotubes (MWCNTs) and graphene oxide (GO)-based polyvinylidene fluoride (PVDF) membranes. The properties of pores (size, shape, and number) as well as membrane hydrophilicity were investigated using field emission scanning electron microscopy, Raman spectroscopy, optical microscopy, water contact angle, and water flux. Results showed that the pore size increased with an increase in coagulation temperature. The hydrophilic functional groups of the added carbon materials increased the solvent and non-solvent diffusion rate, which significantly increased the number of pores by 700% as compared to pure PVDF. Additionally, these functional groups changed the hydrophobic properties of pure PVDF into hydrophilic properties.

Dielectric and Energy Storage Properties of Polyvinylidene Fluoride/Barium Titanate Nanocomposites

2013 ◽  
Vol 833 ◽  
pp. 365-369 ◽  
Author(s):  
Yan Xia Li ◽  
Jin Long Xie ◽  
Zhen Ming Chu ◽  
Xu Sheng Wang ◽  
Xi Yao
Keyword(s):  
Energy Storage ◽  
Barium Titanate ◽  
Polyvinylidene Fluoride ◽  
Breakdown Strength ◽  
Pvdf Film ◽  
Dielectric Performance ◽  
Energy Storage Properties ◽  
High Dielectric ◽  
Pure Pvdf ◽  
Storage Properties

The combination of nanoparticles with high relative permittivity and polymers with high dielectric strength offers a potential to obtain processable nanocomposites with high dielectric performance. In this work, polyvinylidene fluoride (PVDF)-barium titanate (BT) nanocomposites were prepared by spin-coating technique. The surface of BT nanoparticles was treated by titanate coupling agent NDZ101. The dielectric and energy storage properties of the system were studied as a function of BT content. The experimental results showed that the dielectric constant of the nanocomposites increased with the increase of BT content. Although pure PVDF material has the strongest dielectric breakdown strength, the discharged energy storage density Ue of the nanocomposites was greatly improved from 2.8 J/cm3 in pure PVDF film to 6.2 J/cm3 in PVDF/20 wt% BT film; due to larger polarization of the nanocomposite.

SYNTHESIS AND CHARACTERIZATION OF LANTHANUM DOPED SODIUM BISMUTH TITANATE

2002 ◽  
Vol 16 (26) ◽  
pp. 1007-1019 ◽  
Author(s):  
M. APARNA ◽  
T. BHIMASANKARAM ◽  
G. S. KUMAR ◽  
G. PRASAD
Keyword(s):  
Phase Transitions ◽  
Room Temperature ◽  
Bismuth Titanate ◽  
Structural Phase ◽  
Spectroscopic Studies ◽  
Synthesis And Characterization ◽  
Structural Phase Transitions ◽  
Frequency Range ◽  
Impedance Data

Impedance spectroscopic studies on polycrystalline sintered discs of lanthanum doped Na 1/2( La x Bi 1-x)1/2 TiO 3 ceramics with x = 0, 0.1, 0.15 and 0.2, have been carried out in the temperature region ranging from room temperature to 550°C and in the frequency range of 100 Hz to 1 MHz. Impedance data is presented in frequency explicit plots and Cole–Cole plots. The relaxation behavior of the charge entities in the above samples is studied as a function of temperature. The structural phase transitions present in the samples showed interesting changes with composition frequency and temperature. An attempt is made to correlate the results obtained to the phase transitions present in the samples.

scholarly journals Synthesis and Characterization of Novel Fe3O4/PVA/Eggshell Hybrid Nanocomposite for Photodegradation and Antibacterial Activity

2021 ◽  
Vol 5 (10) ◽  
pp. 267
Author(s):  
Piyush Kumar Gupta ◽  
Senthilkumar Palanisamy ◽  
Tamilarasi Gopal ◽  
Ranjithkumar Rajamani ◽  
Soumya Pandit ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Crystal Size ◽  
Antibacterial Property ◽  
Spherical Shape ◽  
Hybrid Nanocomposites ◽  
Eggshell Membrane ◽  
Hybrid Nanocomposite ◽  
Tem Analysis ◽  
Sunlight Irradiation

In the 21st century, hybrid nanocomposites were widely used in bioelectronic, biosensing, photocatalytic, and biomedical applications. In the present study, we fabricated a novel Fe3O4/PVA/Eggshell hybrid nanocomposite and physicochemically characterized it using powder XRD, EDS, FTIR, VSM, and HR-TEM analysis. The XRD spectrum revealed the crystalline and FCC configuration of Fe3O4 NPs with average crystal size of 16.28 nm, and the HRTEM image indicates the prepared hybrid nanocomposite is of spherical shape with less agglomeration. This hybrid nanocomposite showed a significant photodegradation property in degrading organic pollutants such as congo red and crystal violet dyes under the sunlight irradiation. In addition, the hybrid nanocomposite also displayed a potent antibacterial property against different Gram +ve and Gram −ve bacterial pathogens. This study provides a significant example in the overview of fabrication of cost effectively, eco-friendly, and multiple-application hybrid nanocomposites through eggshell membrane fibers.

scholarly journals Characterization of Flexible Multi-Walled Carbon Nanotubes Network Sensor to Freon Gas Detection

2021 ◽  
pp. 2543-2554
Author(s):  
Nisreen M. Al-Makram ◽  
Wasan R. Saleh
Keyword(s):  
Room Temperature ◽  
Filter Cake ◽  
Operating Temperature ◽  
X Ray ◽  
Before And After ◽  
Recovery Times ◽  
Multi Walled Carbon Nanotubes ◽  
Response And Recovery ◽  
Walled Carbon Nanotubes

     MWCNTs-OH was used to prepare a flexible gas sensor by deposition as a network on a filter cake using the method of filtration from suspension (FFS). The morphological and structural properties of the MWCNTs network were characterized before and after exposure to Freon gas using FTIR spectra and X-ray diffractometer, which confirmed that the characteristics of the sensor did not change after exposure to the gas. The sensor was exposed to a pure Freon134a gas as well as to a mixture of Freon gas and air with different ratios at room temperature. The experiments showed that the sensor works at room temperature and the sensitivity values increased with increasing operating temperature, to be 58% until 150 ºC. The fabricated flexible sensor has good response and recovery times at low gas concentrations of 1.3, 2, and 2.7 ppm.

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