scholarly journals Effect of Polyvinyl Alcohol on the Growth, Structure, Morphology, and Electrical Conductivity of Polypyrrole Nanoparticles Synthesized via Microemulsion Polymerization

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Anurag Krishna ◽  
Amit Kumar ◽  
Rajiv Kumar Singh
Keyword(s):  
Electrical Conductivity ◽  
Polyvinyl Alcohol ◽  
Sodium Dodecyl ◽  
Conductivity Measurement ◽  
Soft Template ◽  
Microemulsion Polymerization ◽  
X Ray Diffraction ◽  
Electrical Conductivity Measurement ◽  
Dc Electrical Conductivity ◽  
Ft Ir

Polypyrrole (PPy) nanoparticles were synthesized via microemulsion polymerization technique using sodium dodecyl sulfate as surfactant. Polyvinyl alcohol (PVA) was added as soft template during polymerization to modify the structure and properties of PPy nanoparticles. The synthesized materials namely, PVA-free and PVA added were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and DC electrical conductivity measurements. The sample synthesized in the presence of PVA has longer conjugation length as estimated from FT-IR investigation. Temperature dependence (4.2–300 K) of DC electrical conductivity measurement reveals that the PVA has a strong effect on the polymerization mechanism of PPy giving evidence of H-bonded assistance during polymerization leading to the synthesis of better ordered polymer. A growth mechanism has been proposed which explains the H-bonded assistance of PPy polymerization leading to enhanced structural ordering.

Synthesis and effect of secondary dopant on the conductivity of conducting polymer polyaniline

2013 ◽  
Vol 33 (9) ◽  
pp. 785-792 ◽  
Author(s):  
Kedir Mamma ◽  
Khalid Siraj ◽  
Nathan Meka
Keyword(s):  
Electrical Conductivity ◽  
Conductivity Measurement ◽  
Emeraldine Base ◽  
Cyclic Voltammograms ◽  
Emeraldine Salt ◽  
Salt Form ◽  
Aniline Monomer ◽  
Electrical Conductivity Measurement ◽  
Secondary Doping ◽  
Ft Ir

Abstract Polyaniline (PANI) in its emeraldine salt form was synthesized by chemical method from aniline monomer in the presence of HCl mixed with LiCl and ammonium persulfate as oxidant. Then, a portion of sample was dedoped with NH3 solution and another equal portion was separately postdoped with secondary dopants, such as H2SO4 and HClO4, respectively. Finally, the dried samples of PANI prepared in all its three different forms (emeraldine salt form, undoped emeraldine base, and the two secondary doped forms of PANI) were characterized by UV-visible spectroscopy, cyclic voltammetry (CV) techniques, Fourier transform infrared (FT-IR) spectroscopy, and electrical conductivity measurement. The cyclic voltammograms of PANI in its emeraldine base (PANI-EB) determined the electrochemical behavior and the growth mechanisms of the polymer. The FT-IR and UV-vis spectra confirmed the expected structural modification up on doping, undoping, and postdoping processes of the polymer. Their measured electrical conductivities were from 0.02 for undoped, 156 for primary doped form, and increasing from 158 to 257 S/cm for those secondary doped PANI. The influence of secondary doping on the electrical conductivity was also investigated from their spectroscopic data which shows dramatic rise in conductivity. The result also shows that secondary doping increased the π conjugation.

scholarly journals Electrode Fabrication, Material Characterization and Capacitance Measurement Studies of Polyacrylonitrile/Polypyrrole(PAN/PPY) Composite

2020 ◽  
Vol 11 (1) ◽  
pp. 7614-7620
Keyword(s):  
Electrical Conductivity ◽  
Composite Material ◽  
Sol Gel ◽  
Conductivity Measurement ◽  
Capacitance Measurement ◽  
Electrical Conductivity Measurement ◽  
Dc Electrical Conductivity ◽  
The Stability ◽  
Conductivity Retention ◽  
Thermal Stability Of

For the fabrication of the electrode, the Polyvinyl alcohol/polyaniline composite was prepared by the sol-gel method. The electrical conductivity of the composite was determined on compressed pellets by using a 4-in-line-probe dc electrical conductivity-measuring instrument. The electrical conductivity measurement studies revealed that the composite possessed the electrical conductivity in the range of 10-4 to 10-2 S cm-1, i.e., in the semiconductor region and followed the Arrhenius equation. The thermal stability of the composite material (HCl treated) in terms of dc electrical conductivity retention was studied under isothermal conditions (at 50, 70, 90, 110, 130, and 150 °C) at 15 min intervals. The stability of the material (HCl treated) in terms of electrical conductivity retention was also monitored for five cycles at increasing temperatures with 1 h intervals. The composite material was found thermally and environmentally stable in terms of dc electrical conductivity retention.

Synthesis and Electrical Conductivity Measurement of Polyaniline / Vermiculite Nanocomposites

2010 ◽  
Vol 96 ◽  
pp. 221-226
Author(s):  
Hong Juan Sun ◽  
Ying Liu ◽  
Tong Jiang Peng ◽  
Hai Feng Liu ◽  
Jin Mei Sun
Keyword(s):  
Electrical Conductivity ◽  
Interlayer Space ◽  
In Situ Polymerization ◽  
Conductivity Measurement ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Electrical Conductivity Measurement ◽  
X Ray ◽  
Dimethyl Ammonium

A series of polyaniline/vermiculite nanocomposites was synthesized. The interlayer space of vermiculite was initially increased by the insertion of dioctadecyl dimethyl ammonium bromide, and then the aniline monomers were inserted into the interlayer space of vermiculite replacing dioctadecyl dimethyl ammonium cations. The polyaniline/vermiculite nanocomposites materials were prepared via in situ polymerization of the aniline monomers in the interlayer space of vermiculite. The as-synthesized polyaniline/vermiculite nanocomposite materials were characterized by X-ray diffraction analysis, infrared spectroscopy, and electrical conductivity measurement. The results indicated that the vermiculite was peeled off into the polyaniline. The introduction of vermiculite nanosheets showed a beneficial effect on the electrical conductivity of polyaniline.

Preparation and Property Evaluations of Polyvinyl Alcohol (PVA)/Graphene Nanosheets (GNs) Composite Nanofibrous Mats by Using Electrospinning

2014 ◽  
Vol 910 ◽  
pp. 226-229
Author(s):  
Jia Horng Lin ◽  
Kun Chien Chiang ◽  
Chien Lin Huang ◽  
Ching Wen Lou
Keyword(s):  
Electrical Conductivity ◽  
Polyvinyl Alcohol ◽  
Fiber Diameter ◽  
Graphene Nanosheets ◽  
Conductivity Measurement ◽  
Viscosity Measurement ◽  
Electrical Conductivity Measurement ◽  
Electron Microscopic ◽  
Scanning Electron Microscopic ◽  
Scanning Electron

This study aims to examine the influence of graphene nanosheets (GNs) on the morphology and electrical property of polyvinyl alcohol (PVA) nanofiberous mats. GNs (0.03 %, 0.05 %, 0.1 %, and 0.3 %) are added to PVA solution, and then electrospun into PVA/GNs nanofiberous mats. A viscosity measurement and electrical conductivity measurement are performed on the samples to determine their properties. The experiment results show that when the content of GNs increases from 0.1 % to 0.3 %, the fiber diameter of PVA/GNs nanofiberous mats increases from 166 nm to 239 nm, the conductivity slightly increases, but the viscosity greatly increases. An increment in viscosity causes the beads to form complete fibers, which is in line with the outcome of scanning electron microscopic (SEM) observation.

scholarly journals Electrical Conductivity Measurement on Metallic Materials With a Cylindrical Resonator

2021 ◽  
pp. 1-9
Author(s):  
Yunfeng Dong ◽  
Morten Stendahl Jellesen ◽  
Rune Juul Christiansen ◽  
Jesper Hovelskov ◽  
Jorgen Sundgren ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Conductivity Measurement ◽  
Metallic Materials ◽  
Electrical Conductivity Measurement ◽  
Cylindrical Resonator

Electrical Properties of Y0.06Sr0.94Ti0.6Fe0.4O3-δ-YSZ Composites as Electrode Materials

2016 ◽  
Vol 697 ◽  
pp. 327-330 ◽  
Author(s):  
Ke Shan ◽  
Xing Min Guo ◽  
Feng Rui Zhai ◽  
Zhong Zhou Yi
Keyword(s):  
Electrical Conductivity ◽  
Electrode Materials ◽  
Electronic Conductivity ◽  
Ionic Conductivities ◽  
Conductivity Measurement ◽  
Transference Numbers ◽  
Secondary Phases ◽  
Electrical Conductivity Measurement ◽  
Total Electrical Conductivity ◽  
Phase Compatibility

Y0.06Sr0.94Ti0.6Fe0.4O3-δ-YSZ composites were prepared by mixing Y, Fe co-doped SrTiO3 (Y0.06Sr0.94Ti0.6Fe0.4O3-δ known as YSTF) and 8 mol% Y2O3 stabilized ZrO2 (YSZ) in different weight fractions. The phase stability, phase compatibility, microstructure and mixed ionic-electronic conductivity of composites were investigated. Phase analysis by XRD showed no clearly detectable secondary phases. The electrical conductivity measurement on the YSTF-YSZ composites showed a drastic decrease in total electrical and ionic conductivities when more than 10 wt% of YSZ was used in the composites. The total electrical conductivity was 0.102 S/cm for Y0.06Sr0.94Ti0.6Fe0.4O3-δ and 0.043 S/cm for YSTF-20YSZ at 700 oC, respectively. The value at 700 oC is approximately 2.4 times higher than that of YSTF-20YSZ. The ionic conductivity of Y0.06Sr0.94Ti0.8Fe0.2O3-δ varies from 0.015S/cm at 700 oC to 0.02 S/cm at 800 oC, respectively. The value at 800°C is approximately 12.5 times higher than YSTF-20YSZ. The ion transference numbers of YSTF-YSZ composites vary from 0.14 to 0.28 at 800 °C.

scholarly journals Noninvasive electrical conductivity measurement by MRI: a test of its validity and the electrical conductivity characteristics of glioma

2017 ◽  
Vol 28 (1) ◽  
pp. 348-355 ◽  
Author(s):  
Khin Khin Tha ◽  
Ulrich Katscher ◽  
Shigeru Yamaguchi ◽  
Christian Stehning ◽  
Shunsuke Terasaka ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Conductivity Measurement ◽  
Electrical Conductivity Measurement

Electrical conductivity measurement on DKDP Crystals with different deuterated degrees

2012 ◽  
Vol 109 (1) ◽  
pp. 159-162 ◽  
Author(s):  
Baoan Liu ◽  
Xin Yin ◽  
Minglei Zhao ◽  
Qinghua Zhang ◽  
Mingxia Xu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Conductivity Measurement ◽  
Electrical Conductivity Measurement

Electrical conductivity measurement in studying physicochemical charges in conservation tubes

1987 ◽  
Vol 22 (6) ◽  
pp. 761-764 ◽  
Author(s):  
S. S. Nabatov ◽  
A. N. Dremin ◽  
S. O. Shubitidze ◽  
V. V. Yakushev
Keyword(s):  
Electrical Conductivity ◽  
Conductivity Measurement ◽  
Electrical Conductivity Measurement
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