scholarly journals Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 375
Author(s):  
Jozef Kúdelčík ◽  
Štefan Hardoň ◽  
Pavel Trnka ◽  
Ondřej Michal ◽  
Jaroslav Hornak
Keyword(s):  
Zinc Oxide ◽  
Opposite Effect ◽  
Dissipation Factor ◽  
Temperature Dependent ◽  
Nano Composite ◽  
Segmental Dynamics ◽  
Broadband Dielectric Spectroscopy ◽  
Local Relaxation ◽  
A Charge ◽  
The Given

The influence of different concentrations (0.5, 1.0, and 2.0 wt.%) of Zinc Oxide (ZnO) filler on the dielectric properties of the cold-curing polyurethane (PU) resin is presented in this study. For this purpose, the direct DC conductivity and the broadband dielectric spectroscopy measurements were used to describe the changes in dielectric responses of PU/ZnO nanocomposites over the frequency and temperature range, respectively. It can be stated that, the 1.0 wt.% nanoparticles and lower caused a decrease in the real relative permittivity compared to the pure PU resin, while the higher concentration of nanoparticles for frequencies above 1 Hz had the opposite effect. The presence of nanoparticles in the polyurethane resin affected the segmental dynamics of the polymer chain and changed a charge distribution in the given system. These changes caused a shift of local relaxation peaks in the spectra of imaginary permittivity and dissipation factor of nanocomposites. It is suggested that the temperature-dependent transition of the electric properties in the nano-composite is closely associated with the α-relaxation and intermediate dipolar effects (IDE).

Exploring the Influence of Substitution on the Structure and Transport Properties in the Sodium Superionic Conductor Na11+xSn2+x(Sb1−yPy)1−xS12

2020 ◽  
Author(s):  
Marvin Kraft ◽  
Lara Gronych ◽  
Theodosios Famprikis ◽  
Saneyuki Ohno ◽  
Wolfgang Zeier
Keyword(s):  
Electrochemical Impedance ◽  
Structural Phase ◽  
Ionic Transport ◽  
Sodium Ion ◽  
Ionic Conductors ◽  
Temperature Dependent ◽  
Activation Barriers ◽  
Rietveld Refinements ◽  
High Performing ◽  
The Given

<p>Sulfidic sodium ion conductors are currently investigated for the possible use in all-solid-state sodium ion batteries. The design of high performing electrolytes in terms of temperature-dependent ionic transport is based upon the fundamental understanding of structure – transport relationships within the given structural phase boundaries inherent to the investigated materials class. In this work, the Na<sup>+</sup> superionic structural family of Na<sub>11</sub>Sn<sub>2</sub>PS<sub>12</sub> is explored by using the systematic antimony substitution with phosphorous in Na<sub>11+<i>x</i></sub>Sn<sub>2+<i>x</i></sub>(Sb<sub>1-<i>y</i></sub>P<i><sub>y</sub></i>)<sub>1-<i>x</i></sub>S<sub>12</sub>. A combination of Rietveld refinements against X-ray synchrotron diffraction data with electrochemical impedance spectroscopy is used to monitor the changes in the anionic framework, the Na<sup>+</sup> substructure and the ionic transport. A new simplified descriptor for the average Na<sup>+</sup> diffusion pathways, the average Na<sup>+</sup> polyhedral volume is introduced, which is used to correlate the contraction of the overall lattice and the found activation barriers in the system. This study exemplifies how substitution affects diffusion pathways in ionic conductors and widens the knowledge about the related structural motifs and their influence on the ionic transport in this novel class of ionic conductors.</p>

scholarly journals Characterization of Antimicrobial Poly (Lactic Acid)/Nano-Composite Films with Silver and Zinc Oxide Nanoparticles

Materials ◽  
2017 ◽  
Vol 10 (6) ◽  
pp. 659 ◽  
Author(s):  
Zhuangzhuang Chu ◽  
Tianrui Zhao ◽  
Lin Li ◽  
Jian Fan ◽  
Yuyue Qin
Keyword(s):  
Zinc Oxide ◽  
Lactic Acid ◽  
Zinc Oxide Nanoparticles ◽  
Composite Films ◽  
Poly Lactic Acid ◽  
Oxide Nanoparticles ◽  
Nano Composite

Temperature-dependent capacitance studies of palladium/zinc oxide Schottky diodes

2006 ◽  
Vol 39 (1-4) ◽  
pp. 1-7 ◽  
Author(s):  
C. Weichsel ◽  
O. Pagni ◽  
E. van Wyk ◽  
A.W.R. Leitch
Keyword(s):  
Zinc Oxide ◽  
Schottky Diodes ◽  
Temperature Dependent

Sintering Temperature-Dependent Chemical Defects and the Effect on the Electrical Resistivity of Thermoelectric ZnO

2014 ◽  
Vol 1 (1-2) ◽  
Author(s):  
Yu Zhao ◽  
Ashok Kumar ◽  
Giti A. Khodaparast ◽  
Amnah Eltahir ◽  
Hsin Wang ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Electrical Resistivity ◽  
Electrical Property ◽  
Thermoelectric Properties ◽  
Carrier Density ◽  
Sintering Temperature ◽  
Sharp Decrease ◽  
Synthesis Temperature ◽  
Temperature Dependent ◽  
Al Doping

AbstractThermoelectric properties of zinc oxide (ZnO) are largely influenced by its electrical property. In this paper, we investigated the correlation between the electrical resistivity and synthesis temperature for aluminum (Al)-modified ZnO. At constant Al doping, the electrical resistivity of ZnO exhibited sharp decrease with increase in sintering temperature due to the increased carrier density resulting from Al

LaSeTe2 — Temperature Dependent Structure Investigation and Electron Holography on a Charge-Density-Wave-Hosting Compound.

ChemInform ◽  
2004 ◽  
Vol 35 (8) ◽  
Author(s):  
Thomas Doert ◽  
Boniface Polequin Tsinde Fokwa ◽  
Paul Simon ◽  
Sven Lidin ◽  
Tilo Soehnel
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Electron Holography ◽  
Structure Investigation ◽  
Temperature Dependent ◽  
A Charge
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