COMPARATIVE STUDY OF RESPONSE TO HIGH DC ELECTRIC FIELD IN A LARGE TEMPERATURE RANGE FOR K0.3MoO3

2004 ◽  
Vol 18 (14) ◽  
pp. 697-705
Author(s):  
HUI LI ◽  
JUNFENG WANG ◽  
RUI XIONG ◽  
FAN YI ◽  
WUFENG TANG ◽  
...  
Keyword(s):  
Electric Field ◽  
Linear Correlation ◽  
Applied Electric Field ◽  
Constant Current ◽  
Threshold Field ◽  
Large Temperature ◽  
Constant Voltage ◽  
Conducting State ◽  
Temperature Range ◽  
Dc Electric Field

We investigated the response of K 0.3 MoO 3 to high dc electric field in a large temperature range 14–95 K. The remarkable switching from insulating to highly conducting state was observed at 14–75 K. The second threshold field for the switching takes a minimum value at around 50 K. In the highly conducting state, the conductance displays a novel linear correlation to the applied electric field. We also compared the I–E characteristic obtained in the constant-voltage condition and the constant-current condition, which show distinct differential resistances.

THE RESPONSE OF STARCH/GELATIN/GLYCERIN AQUEOUS ELECTRORHEOLOGICAL ELASTOMER TO APPLIED ELECTRIC FIELD

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1449-1455 ◽  
Author(s):  
LINGXIANG GAO ◽  
XIAOPENG ZHAO
Keyword(s):  
Electric Field ◽  
Applied Electric Field ◽  
Applied Field ◽  
Weight Fraction ◽  
Compression Modulus ◽  
Composite Systems ◽  
Water Matrix ◽  
Dc Electric Field

The aqueous ER elastomers, containing crude organic starch particles which dispersed in gelatin/glycerin/water matrix, were prepared with or without the applied DC electric field. The responses of the composite systems to the electric field were tested by the compression modulus and resistance of the elastomers. The result shows that they are enhanced and controlled evidently under an applied DC electric field. The strongest responses appear at 25% weight fraction of starch. In addition, the increment modulus of the elastomer increases with the strength of the applied field within 0.5~1.5 kV/mm, while after the field is stronger than 1.5 kV/mm it doesn't increase with field, appearing "saturation".

Properties of Amorphous and Crystalline Ta2O5 Thin Films Prepared by Metalorganic Solution Deposition Technique for Integrated Electronic Devices

2000 ◽  
Vol 623 ◽  
Author(s):  
P.C. Joshi ◽  
M.W. Cole
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Electric Field ◽  
Applied Electric Field ◽  
Annealing Temperature ◽  
Electrical Measurements ◽  
Solution Deposition ◽  
Temperature Range ◽  
Si Substrates ◽  
Bias Stability

AbstractWe report on the properties of Ta2O5 thin films prepared by the metalorganic solution deposition (MOSD) technique on Pt-coated Si, n+-Si, and poly-Si substrates. The effects of postdeposition annealing temperature on the structural, electrical, and optical properties were analyzed. The electrical measurements were conducted on MIM and MIS capacitors. The dielectric constant of amorphous Ta2O5 thin films was in the range 29.2-29.5 up to 600°C, while crystalline thin films, annealed in the temperature range 650–750°C, exhibited enhanced dielectric constant in the range 45.6–51.7. The dielectric loss factor did not show any appreciable dependence on the annealing temperature and was in the range 0.006–0.009. The films exhibited high resistivities of the order of 1012–1015 Δ-cm at an applied electric field of 1 MV/cm in the annealing temperature range of 500-750 °C. The temperature coefficient of capacitance was in the range 52-114 ppm/°C for films annealed in the temperature range 500-750°C. The bias stability of capacitance, measured at an applied electric field of 1 MV/cm, was better than 1.41 % for Ta2O5 films annealed up to 750°C.

Activity waves and freestanding vortices in populations of subcritical Quincke rollers

2021 ◽  
Vol 118 (40) ◽  
pp. e2104724118
Author(s):  
Zeng Tao Liu ◽  
Yan Shi ◽  
Yongfeng Zhao ◽  
Hugues Chaté ◽  
Xia-qing Shi ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Electric Field ◽  
Colloidal Particles ◽  
Threshold Field ◽  
Active Matter ◽  
Active Particles ◽  
Fast Activity ◽  
Excitable Systems ◽  
Dc Electric Field ◽  
The Many

Virtually all of the many active matter systems studied so far are made of units (biofilaments, cells, colloidal particles, robots, animals, etc.) that move even when they are alone or isolated. Their collective properties continue to fascinate, and we now understand better how they are unique to the bulk transduction of energy into work. Here we demonstrate that systems in which isolated but potentially active particles do not move can exhibit specific and remarkable collective properties. Combining experiments, theory, and numerical simulations, we show that such subcritical active matter can be realized with Quincke rollers, that is, dielectric colloidal particles immersed in a conducting fluid subjected to a vertical DC electric field. Working below the threshold field value marking the onset of motion for a single colloid, we find fast activity waves, reminiscent of excitable systems, and stable, arbitrarily large self-standing vortices made of thousands of particles moving at the same speed. Our theoretical model accounts for these phenomena and shows how they can arise in the absence of confining boundaries and individual chirality. We argue that our findings imply that a faithful description of the collective properties of Quincke rollers need to consider the fluid surrounding particles.

Field-induced effects in an eutectic nematic liquid crystal mixture

2003 ◽  
Vol 81 (12) ◽  
pp. 1427-1432 ◽  
Author(s):  
A K Gathania ◽  
K K Raina
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Work Function ◽  
Domain Structure ◽  
Nematic Liquid Crystal ◽  
Threshold Field ◽  
Electric Field Effects ◽  
Dc Electric Field ◽  
Substrate Surfaces ◽  
Crystal Mixture

Electric-field effects were investigated in a planar-aligned nematic liquid crystal mixture. Under a DC electric field, we observed the presence of domains. The domain structure changed near the threshold field. The effects of charge injection from the substrate surfaces were investigated. The work function is calculated using Richardson's equation.PACS No.: 61.30.Hn

Current induced organization in thin nanocrystalline gold films during deposition

2001 ◽  
Vol 676 ◽  
Author(s):  
P. Chaoguang ◽  
J. Ederth ◽  
L. B. Kish ◽  
C. G. Granqvist
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Applied Electric Field ◽  
Substrate Surface ◽  
Film Structure ◽  
Gold Films ◽  
Percolation Effect ◽  
Dc Electric Field ◽  
Film Microstructure

ABSTRACTNanocrystalline gold films were prepared by advanced gas deposition. Electric field induced effects on the film structure during and after deposition was investigated. A dc electric field in the range 2 ≤Ua ≤ 8 V/cm, was applied parallel to the substrate surface and led to changes of film microstructure and resistivity. In another set of experiments, films deposited at Ua = 0 were exposed to electric fields of similar strength after deposition. Film degradation could be understood from a mechanism consistent with a biased-percolation effect. Our results show that it is possible to control the film structure by varying the strength of an applied electric field.

LIQUID CRYSTLASLIGHT SCATTERING BY FLUCTUATIONS INDUCED BY AN APPLIED ELECTRIC FIELD IN A NEMATIC LIQUID CRYSTAL (APAPA)

1972 ◽  
Vol 33 (C1) ◽  
pp. C1-63-C1-67 ◽  
Author(s):  
M. BERTOLOTTI ◽  
B. DAINO ◽  
P. Di PORTO ◽  
F. SCUDIERI ◽  
D. SETTE
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Applied Electric Field
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