Enhanced electrical conductivity and mechanical stability of flexible pressure-sensitive GNPs/CB/SR composites: Synergistic effects of GNPs and CB

2015 ◽  
Vol 30 (22) ◽  
pp. 3394-3402 ◽  
Author(s):  
Ping Liu ◽  
Ying Huang ◽  
Caixia Liu ◽  
Yue Wang ◽  
Xiaohui Guo ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Mechanical Stability ◽  
Synergistic Effects ◽  
Pressure Sensitive ◽  
Image Position

Abstract

Expanded Graphite/Epoxy/Aliphatic Amine Composites for Bipolar Plates Applications in Polymer Electrolyte Fuel Cells

2019 ◽  
Vol 821 ◽  
pp. 426-432 ◽  
Author(s):  
Andres F. Rigail-Cedeño ◽  
Mayken Espinoza-Andaluz ◽  
Jorge Medina-Andrade ◽  
Karol Leal-Zavala
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Aliphatic Amine ◽  
Synergistic Effects ◽  
Expanded Graphite ◽  
Diglycidyl Ether ◽  
Polymer Electrolyte Fuel Cells ◽  
Graphite Nanoplatelets ◽  
Bipolar Plates

Suitable conductive fillers for resins and processing conditions are critical factors for the final properties of composite bipolar plates. This research is focused on the development of expanded graphite/epoxy/aliphatic amine composite as a potential replacement for conventional bipolar plates to meet global standards of Polymer Electrolyte Fuel Cells (PEFCs). The synergistic effects on the electrical conductivity of secondary fillers Carbon Black (CB) and Graphite nanoplatelets (GNP) with Expanded Graphite (EG) were studied in a diglycidyl ether of bisphenol A (DGEBA) epoxy/polyether triamine system. Compositions of secondary filler were varied in proportions of 5, 10, 15 and 20 wt % in a fixed 40 wt % EG / Epoxy resin (w/w) to find the right secondary fillers under direct mixing without solvent. A 10 wt % CB displayed the highest electrical conductivity around 3.05 QUOTE x10-2 S/cm. For a 60 wt % EG/10 wt % CB composite, the electrical conductivity (in plane) and flexural strength were at about 19 S/cm and 22 MPa, respectively.

Evaporation induced nanoparticle – binder interaction in electrode film formation

2017 ◽  
Vol 19 (15) ◽  
pp. 10051-10061 ◽  
Author(s):  
Zhixiao Liu ◽  
David L. Wood ◽  
Partha P. Mukherjee
Keyword(s):  
Electrical Conductivity ◽  
Mechanical Stability ◽  
Film Formation ◽  
Drying Temperature

Low drying temperature and longer chain binders are preferred to produce electrode films with good electrical conductivity and mechanical stability.

scholarly journals Novel Pressure Sensors Made from Nanocomposites (Biodegradable Polymers–Metal Oxide Nanoparticles): Fabrication and Characterization

2018 ◽  
Vol 63 (8) ◽  
pp. 754 ◽  
Author(s):  
A. Hashim ◽  
A. Hadi
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Low Cost ◽  
Metal Oxide Nanoparticles ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Oxide Nanoparticles ◽  
Ac Electrical Conductivity ◽  
Dc Electrical Conductivity ◽  
Pressure Sensitive

This paper aims to the preparation of novel pressure-sensitive nanocomposites with low cost, light weight, and good sensitivity. The nanocomposites of polyvinyl alcohol, polyacrylic acid, and lead oxide nanoparticles have been investigated. The dielectric properties and dc electrical conductivity of (PVA–PAA–PbO2) nanocomposites have been studied. The dielectric properties of nanocomposites were measured in the frequency range (100 Hz–5 MHz). The experimental results showed that the dielectric constant and dielectric loss of (PVA–PAA–PbO2) nanocomposites decrease, as the frequency increases, and they increase with the concentrations of PbO2 nanoparticles. The ac electrical conductivity of (PVA–PAA–PbO2) nanocomposites increases with the frequency and the concentrations of PbO2 nanoparticles. The dc electrical conductivity of (PVA–PAA–PbO2) nanocomposites also increases with the concentrations of PbO2 nanoparticles. The application of pressure-sensitive nanocomposites has been examined in the pressure interval (60–200) bar. The results showed that the electrical resistance of (PVA–PAA–PbO2) pressure-sensitive nanocomposites decreases, as the compressive stress increases. The (PVA–PAA–PbO2) nanocomposites have high sensitivity to pressure.

The electronic properties tuned by the synergy of polaron and d-orbital in a Co–Sn co-intercalated α-MoO3 system

2020 ◽  
Vol 8 (19) ◽  
pp. 6536-6541
Author(s):  
Xin Xu ◽  
Haojie Lai ◽  
Yufan Xia ◽  
Tian Luo ◽  
Yuxuan Chen ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electronic Properties ◽  
Synergistic Effects ◽  
System P ◽  
Internal Mechanism ◽  
D Orbitals

Internal mechanism of the Sn–Co co-intercalated α-MoO3 system with excellent electrical conductivity: synergistic effects of polaron and d orbitals.

The preparation and study of a holey polymer film

1987 ◽  
Vol 45 ◽  
pp. 644-645
Author(s):  
Phillip K. Vinson
Keyword(s):  
Electrical Conductivity ◽  
Polymer Film ◽  
Carbon Coating ◽  
Mechanical Stability ◽  
Continuous Film ◽  
Thin Specimen ◽  
Liquid Samples ◽  
Tem Grid

A holey carbon grid (HCG) consists of a TEM grid with a holey polymer film (HPF) attached to its surface and a carbon coating to provide mechanical stability and electrical conductivity. HCGs have found wide use in the preparation of liquid samples for cryo-TEM. These grids increase the number of sample sites by as much as three orders of magnitude and aid in the formation of fairly uniform, thin specimen films (< 250 nm). Several methods have been reported for the production of HPFs for specimen support. Unfortunately, most methods are unreliable, often producing films with pseudo-holes and large continuous film regions. Essential to improving any technique is an understanding of the process mechanisms involved. This paper describes a technique, modified from Refs. 1 and 2, for preparing HPFs and suggests a drying mechanism to explain the results.

An Interlinked Computational-Experimental Investigation into SnS Nano-Flakes for Field Emission Application

2021 ◽  
Author(s):  
Mamta P. Nasane ◽  
Sachin R. Rondiya ◽  
Chandradip D. Jadhav ◽  
Ganesh Rahane ◽  
Russell William Cross ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Experimental Investigation ◽  
Work Function ◽  
Field Emission ◽  
Mechanical Stability ◽  
Semiconductor Materials ◽  
Field Emitters ◽  
Significant Interest

Layered binary semiconductor materials have attracted significant interest as field emitters due to their low work function, mechanical stability, high thermal and electrical conductivity. Herein, we report a systematic experimental...

The Electrical Resistance of Dilute Solid Solutions

1936 ◽  
Vol 32 (2) ◽  
pp. 281-290 ◽  
Author(s):  
N. F. Mott
Keyword(s):  
Solid Solution ◽  
Electrical Conductivity ◽  
Solid Solutions ◽  
Electrical Resistance ◽  
Unit Volume ◽  
Effective Number ◽  
Free Electrons ◽  
Mechanical Explanation ◽  
Image Position ◽  
Matthiessen's Rule

1. As is well known, the electrical resistance of a metal is very greatly in-creased by the addition of a second metal with which it forms a solid solution. The increase Δρ in the resistivity due to the addition of a small percentage of the second metal is in general independent of the temperature (Matthiessen's rule), though there are oertain exceptions (e.g. Cr in Au). The quaritum-mechanical explanation of both these facts was first given by Nordheim, and may be expressed as follows: the electrical conductivity of any metal may be written in the formwhere τ is the “time of relaxation”, equal to half the time between collisions, and N is the effective number of free electrons per unit volume: hence, for the resistivity, we have

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