Thermally induced double-positive temperature coefficients of electrical resistivity in combined conductive filler-doped polymer composites

2017 ◽  
Vol 134 (23) ◽  
Author(s):  
Yan-ling Hou ◽  
Peng Zhang ◽  
Miao-miao Xie
Keyword(s):  
Electrical Resistivity ◽  
Polymer Composites ◽  
Conductive Filler ◽  
Positive Temperature ◽  
Double Positive ◽  
Thermally Induced ◽  
Temperature Coefficients ◽  
Doped Polymer

Electronic properties of the actinide metals at low temperatures

1963 ◽  
Vol 276 (1367) ◽  
pp. 553-570 ◽  
Keyword(s):  
Electrical Resistivity ◽  
Low Temperatures ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Al Alloys ◽  
Positive Temperature ◽  
Positive Coefficient ◽  
Disorder Effects ◽  
Temperature Coefficients ◽  
Spin Disorder

The electrical resistivity and thermoelectric power of thorium, uranium, neptunium and plutonium have been measured down to liquid-helium and liquid-hydrogen temperatures. The resistivities are relatively high, especially those of neptunium and plutonium, while all the thermoelectric powers show complicated temperature relations. The temperature dependence of the resistance of a-plutonium is abnormal, being characterized by a small negative temperature coefficient above 105 °K and a large positive coefficient below this temperature. Some plutonium rich d-Pu + Al alloys also show similar behaviour. An explanation in terms of spin-disorder effects seems most reasonable, and it is suggested that both a- and d-plutonium may be antiferromagnetic. The resistance—temperature curves of uranium and neptunium also are unusual in that the positive temperature coefficients decrease monotonically with rising temperature. Possible reasons for this have been discussed.

Suppressing the negative temperature coefficient effect of resistance in polymer composites with positive temperature coefficients of resistance by coating with parylene

2020 ◽  
Vol 8 (22) ◽  
pp. 7304-7308 ◽  
Author(s):  
Chihiro Okutani ◽  
Tomoyuki Yokota ◽  
Ryotaro Matsukawa ◽  
Takao Someya
Keyword(s):  
Temperature Coefficient ◽  
Polymer Composites ◽  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Positive Temperature Coefficient ◽  
Positive Temperature ◽  
Temperature Coefficients ◽  
Ntc Effect

Thin parylene coating suppressed the negative temperature coefficient (NTC) effect of polymer thermistors with a positive temperature coefficient (PTC) while maintaining the PTC characteristics.

Polymer composites as sensing materials for liquid organic solvents – preliminary results

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Stanislaw Frackowiak ◽  
Monika Maciejewska ◽  
Andrzej Szczurek ◽  
Marek Kozlowski
Keyword(s):  
Electrical Resistivity ◽  
Carbon Black ◽  
Polymer Composites ◽  
Percolation Theory ◽  
Liquid Mixtures ◽  
Organic Liquids ◽  
Volumetric Fraction ◽  
Factors Influencing ◽  
Benzene Toluene ◽  
Main Factors

AbstractCarbon black-filled polymer composites were investigated as sensing materials for organic liquids. Polypropylene and polystyrene which were selected as matrices and various amounts of carbon black were considered as the main factors influencing sensitivity of the composites in view of the percolation theory. Disposable filaments were produced of these materials. Change in their electrical resistivity was measured upon immersion in benzene, toluene, xylene, ethylbenzene and their mixtures. It has been found that studied materials were sensitive to the composition of liquid mixtures of organic solvent. Relationships between the filament response and volumetric fraction of the components were presented. The studied materials have shown promising sensing properties, which suggest their applicability for identification and quantification of multicomponent organic liquids.

Gamma-ray attenuation behaviors of hematite doped polymer composites

2020 ◽  
Vol 129 ◽  
pp. 103504 ◽  
Author(s):  
Mehmet Fatih Turhan ◽  
Ferdi Akman ◽  
Hasan Polat ◽  
Mustafa Recep Kaçal ◽  
İskender Demirkol
Keyword(s):  
Polymer Composites ◽  
Gamma Ray ◽  
Gamma Ray Attenuation ◽  
Doped Polymer

Up-conversion luminescence of RE3+ -doped polymer composites KGd(WO4)2&PMMA

2019 ◽  
Vol 88 ◽  
pp. 366-371 ◽  
Author(s):  
D. Kasprowicz ◽  
A. Chiasera ◽  
A. Chappini ◽  
L. Zur ◽  
J. Gapinski ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Doped Polymer
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