Temperature-dependent resistivity and conduction mechanism in carbon particle-filled polymers

1992 ◽  
Vol 27 (5) ◽  
pp. 1322-1326 ◽  
Author(s):  
F. Carmona ◽  
C. Mouney
Keyword(s):  
Conduction Mechanism ◽  
Carbon Particle ◽  
Temperature Dependent ◽  
Filled Polymers ◽  
Temperature Dependent Resistivity

Simulation of Temperature-Dependent Resistivity for Manganite La 1/3 Ca 2/3 MnO 3

2006 ◽  
Vol 23 (6) ◽  
pp. 1551-1553 ◽  
Author(s):  
Cao Shuo ◽  
Zhou Qing-Li ◽  
Guan Dong-Yi ◽  
Lu Hui-Bin ◽  
Yang Guo-Zhen
Keyword(s):  
Temperature Dependent ◽  
Temperature Dependent Resistivity

Migration and Settling of Particulates in Filled Epoxies

2003 ◽  
Author(s):  
Lisa Mondy ◽  
Rekha Rao ◽  
Eric Lindgren ◽  
Amy Sun ◽  
Robert Lagasse ◽  
...  
Keyword(s):  
Particle Concentration ◽  
Particle Migration ◽  
Polymerization Reaction ◽  
Temperature Dependent ◽  
Filled Polymers ◽  
Post Test ◽  
Manufacturing Applications ◽  
Microscopy Data ◽  
Suspension Model ◽  
Epoxy Systems

Manufacturing applications for filled polymers include encapsulation of microelectronics and injection molding of composite parts. Predictive tools for simulating these manufacturing processes require knowledge of time- and temperature-dependent rheology of the polymer as well as information about local particle concentration. The overall system rheology is highly dependent on the particle concentration. The local particle concentration can change due to gravity, convection and shear-induced migration. For the epoxy systems of interest, an extent of reaction can be used to track the degree of cure. We couple the curing model with a diffusive flux suspension model [Zhang and Acrivos 1994] to determine the particle migration. This results in a generalized Newtonian model that has viscosity as a function of temperature, cure and concentration. Using this model, we examine settling of the particulate phase in both flowing and quiescent curing systems. We focus on settling in molds and flow in wide-gap counter-rotating cylinders. The heat transfer, including the exothermic polymerization reaction, must be modeled to achieve accurate results. The model is validated with temperature measurements and post-test microscopy data. Particle concentration is determined with x-ray microfocus visualization or confocal microscopy. Agreement between the simulations and experimental results is fair.

SYNTHESIS, STRUCTURAL, OPTICAL AND ELECTRICAL PROPERTIES OF IN-SITU SYNTHESIZED POLYANILINE/SILVER NANOCOMPOSITES

2012 ◽  
Vol 05 (03) ◽  
pp. 1250026 ◽  
Author(s):  
FAHAD ALAM ◽  
SAJID ALI ANSARI ◽  
WASI KHAN ◽  
M. EHTISHAM KHAN ◽  
A. H. NAQVI
Keyword(s):  
Single Phase ◽  
In Situ Polymerization ◽  
Optical And Electrical Properties ◽  
Silver Colloid ◽  
Dielectric Measurements ◽  
Temperature Dependent ◽  
Colloidal Form ◽  
Uv Visible ◽  
Temperature Dependent Resistivity

Polyaniline (PANI) is recognized as one of the most important conducting polymers due to its high conductivity and good stability. In this paper, polyaniline/silver (PANI/Ag) nanocomposites were synthesized by in-situ polymerization of aniline using ammonium peroxydisulphate (APS) as oxidizing agent with varying concentration of Ag nanoparticles colloids (0 ml, 25 ml and 50 ml). Silver nanoparticles were synthesized separately in colloidal form from silver nitrate (Ag2NO3) with the help of reducing agent sodium borohydride (NaBH4). The PANI/ Ag nanocomposites were characterized by XRD, SEM, AFM, UV-visible, temperature dependent resistivity and dielectric measurements. All samples show a single phase nature of the nanoparticles. The electrical resistivity as function of temperature was measured in the temperature range 298–383 K, which indicates a semiconducting to metallic transition at 373 K and 368 K for 25 ml and 50 ml silver colloid samples, respectively.

Electrical Resistivity and Magnetoresistance of the δ-FeZn10 Complex Intermetallic Phase

2013 ◽  
Vol 1517 ◽  
Author(s):  
P. Koželj ◽  
S. Jazbec ◽  
J. Dolinšek
Keyword(s):  
Electrical Resistivity ◽  
Intermetallic Phase ◽  
Structural Complexity ◽  
Weak Localization ◽  
Intrinsic Disorder ◽  
Atomic Clusters ◽  
Charge Carriers ◽  
Temperature Dependent ◽  
Temperature Dependent Resistivity ◽  
Complex Metallic Alloys

ABSTRACTThe δ-FeZn10 phase possesses high structural complexity typical of complex metallic alloys: a giant unit cell comprising 556 atoms, polyhedral atomic order with icosahedrally-coordinated environments, fractionally occupied lattice sites and statistically disordered atomic clusters that introduce intrinsic disorder into the structure. The electrical resistivity is large and exhibits a maximum at about 220 K. The magnetoresistance is sizeable, amounting to 1.5 % at 2 K in 9 T field. The temperature–dependent resistivity is discussed within the frame of the theory of slow charge carriers, applicable to metallic systems with weak dispersion of the electronic bands, where the electron motion changes from ballistic to diffusive upon heating. A comparison to the theory of weak localization is also made.

scholarly journals Temperature-dependent analysis of conduction mechanism of leakage current in thermally grown oxide on 4H-SiC

2015 ◽  
Vol 117 (2) ◽  
pp. 024505 ◽  
Author(s):  
Mitsuru Sometani ◽  
Dai Okamoto ◽  
Shinsuke Harada ◽  
Hitoshi Ishimori ◽  
Shinji Takasu ◽  
...  
Keyword(s):  
Leakage Current ◽  
Conduction Mechanism ◽  
Thermally Grown Oxide ◽  
Temperature Dependent ◽  
Thermally Grown
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