Responsibility of electric resistance of polyethyleneimine-grafted carbon black against alcohol vapor and humidity

1997 ◽  
Vol 39 (2) ◽  
pp. 217-224 ◽  
Author(s):  
Norio Tsubokawa ◽  
Sachio Yoshikawa ◽  
Kiyotaka Maruyama ◽  
Tomoaki Ogasawara ◽  
Kazuhiro Saitoh
Keyword(s):  
Carbon Black ◽  
Electric Resistance ◽  
Alcohol Vapor

Responsiveness of electric resistance of polymer-grafted carbon black/alumina gel composite against solvent vapor and solute in solution

2000 ◽  
Vol 44 (3) ◽  
pp. 317-324 ◽  
Author(s):  
Norio Tsubokawa ◽  
Junya Inaba ◽  
Katsunori Arai ◽  
Kazuhiro Fujiki
Keyword(s):  
Carbon Black ◽  
Electric Resistance ◽  
Solvent Vapor ◽  
Alumina Gel

Porous electrodes for the preparation of peroxide by reduction of oxygen; Influence of the content of polyethylene

1979 ◽  
Vol 44 (4) ◽  
pp. 996-1002 ◽  
Author(s):  
Otomar Špalek
Keyword(s):  
Carbon Black ◽  
Current Density ◽  
Porous Electrodes ◽  
Current Yield ◽  
Electric Resistance ◽  
Polyethylene Powder

With porous electrodes prepared by pressing a mixture of carbon black and polyethylene powder, the influence of the content of the binder on their electric resistance, wettability, current density, and current yield of peroxide during reduction of oxygen was studied.

Generation of hydrogen peroxide by reduction of oxygen in semihydrophobic trickle electrodes

1991 ◽  
Vol 56 (2) ◽  
pp. 309-316 ◽  
Author(s):  
Otomar Špalek ◽  
Karel Balogh
Keyword(s):  
Hydrogen Peroxide ◽  
Carbon Black ◽  
Oxygen Reduction ◽  
Surface Area ◽  
Phase Interface ◽  
Electrochemical Activity ◽  
Polarization Curves ◽  
Electric Resistance ◽  
Graphite Felt ◽  
Three Phase

The reduction of oxygen to hydrogen peroxide was studied in semihydrophobic trickle electrodes prepared from crushed graphite and teflonized carbon black. The potential of these electrodes was found markedly more positive and the peroxide current yields appreciably higher than for electrodes made of used crushed graphite. The reason for this is the higher surface area of the electrodes containing carbon black and occurrence of a three-phase interface in them. The relevant properties, i.e. electric resistance, electrolyte holdup, polarization curves for the oxygen reduction and pexide current yields, were also studied for trickle electrodes containing graphite felt. The electrochemical activity of electrodes made from untreated felt was found rather low but it increased several times when felt pretreated by oxidation was used.

scholarly journals The Influence of Local Strain Distribution on the Effective Electrical Resistance of Carbon Black Filled Natural Rubber

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2411
Author(s):  
E. Harea ◽  
S. Datta ◽  
M. Stěnička ◽  
J. Maloch ◽  
R. Stoček
Keyword(s):  
Carbon Black ◽  
Natural Rubber ◽  
Strain Distribution ◽  
Real Life ◽  
Local Strain ◽  
Image Correlation ◽  
Mode Switching ◽  
Propagation Mode ◽  
Steady Increase ◽  
Electric Resistance

A monotonous relation between strain and measured electric resistance is highly appreciated in stretchable elastomer sensors. In real-life application the voids or technological holes of strained samples often induce non-homogeneous local strain. The present article focused on studying the effect of non-homogeneous local strain on measured direct current (DC) effective electric resistance (EER) on samples of natural rubber (NR), reinforced with 50, 60 and 70 phr of carbon black (CB). Samples were imparted geometrical inhomogeneities to obtain varied local strains. The resulting strain distribution was analyzed using Digital Image Correlation (DIC). EER exhibited a well-detectable influence of locations of inhomogeneities. Expectedly, the EER globally decreased with an increase in CB loading, but showed a steady increase as a function of strain for 50 and 60 phr over the complete testing protocol. Interestingly, for 70 phr of CB, under the same testing conditions, an alternating trend in EER was encountered. This newly observed behavior was explained through a novel hypothesis—“current propagation mode switching phenomenon”. Finally, experimentally measured EERs were compared with the calculated ones, obtained by summing the global current flow through a diversity of strain dependent resistive domains.

Gas Sensing Materials from Carbon Black/Poly(Methyl Methacrylate) Composites

2003 ◽  
Vol 11 (4) ◽  
pp. 291-299 ◽  
Author(s):  
Xian Ming Dong ◽  
Ruo Wen Fu ◽  
Ming Qiu Zhang ◽  
Bin Zhang ◽  
Jun Rong Li ◽  
...  
Keyword(s):  
Carbon Black ◽  
Methyl Methacrylate ◽  
Gas Sensing ◽  
In Situ Polymerization ◽  
Effect Of Temperature ◽  
Electric Resistance ◽  
Poly Methyl Methacrylate ◽  
Electrical Percolation ◽  
Electrical Percolation Threshold

In this work, the electrical conductivity of carbon black/poly(methyl methacrylate) composites and its responsiveness to organic solvent vapors were investigated. The carbon black-polymer conducting composites were synthesized by in-situ polymerization. They exhibited a low electrical percolation threshold (~3.3wt% of carbon black). The electric resistance of the composites increased drastically by over 104 times when they were exposed to good solvent vapours such as chloroform, tetrahydrafuran and ethyl acetate, and it recovered when the composites were transferred to air. The effect of temperature on the vapour responsivity of the composites was notable. An elevated temperature accelerated the vapour-induced variation in electrical resistance of the composites. The experimental data also indicate that the composites possessed a good reproducibility of vapour responsivity. These results suggest that they can be regarded as promising gas sensors characterized by easy processability and cost effectiveness.

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