Impedance Spectroscopy and Dielectric Properties of Carbon Nanotube-Reinforced Epoxy Polymer Composites

2020 ◽  
Vol 13 (2) ◽  
pp. 113-121
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Impedance Spectroscopy ◽  
Grain Boundary ◽  
Polymer Composites ◽  
Equivalent Circuit ◽  
Epoxy Polymer ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Filler Concentration

Abstract: The aim of this work is to investigate the electric properties of carbon nanotube-reinforced epoxy polymer composites, using impedance spectroscopy, in the frequency range from 1 to 10 and over the temperature range from 25 to 105 . The dielectric response was analyzed using the complex permittivity and the electrical modulus formalisms, depending on temperature and filler concentration in the polymer matrix. Furthermore, an equivalent circuit model is proposed to describe the impedance response of carbon nanotubes/epoxy composites. The impedance studies disclosed the appearance of grain and grain-boundary effects, as confirmed by the Nyquist plot. Keywords: Carbon nanotubes, Composites, Impedance spectroscopy, Equivalent circuit model, Grain effect, Grain-boundary effect.

Measuring and Modeling Analysis of Electrochemical Impedance Spectroscopy for Hydration Procedure of Cement Materials

2012 ◽  
Vol 588-589 ◽  
pp. 1033-1036 ◽  
Author(s):  
Xiang Ping Xian ◽  
Yan Shuai Wang ◽  
Feng Xing ◽  
Bi Qin Dong
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Equivalent Circuit ◽  
Electrochemical Impedance ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Cement Material ◽  
Capacitance Effect ◽  
Phase Transmission ◽  
Multi Phase

In this paper, the electrochemical impedance spectroscopy method is applied to characteristic the hydration procedure in cement materials. And a new equivalent circuit model is developed to express the hydration procedure of cement material. As cement paste is a complicated electrochemical system with multi-phase transmission, the equivalent circuit model is considered with the additional double layer capacitance effect at the interface among the hydration products in cement materials. It can express the electrochemical station in cement material, as the multi-phase mass transmission in the cement-based material during the hydration procedure.

scholarly journals An equivalent circuit model for electric conductive polymer composites

1993 ◽  
Vol 2 (4) ◽  
pp. 096369359300200
Author(s):  
M Q Zhang ◽  
H M Zeng ◽  
H F Wang ◽  
X Yao
Keyword(s):  
Carbon Black ◽  
Polymer Composites ◽  
Equivalent Circuit ◽  
Frequency Spectrum ◽  
High Density Polyethylene ◽  
Conductive Polymer ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Carbon Black Content ◽  
Conductive Polymer Composites

The electric properties of conductive high density polyethylene (HDPE) composites filled with carbon black were characterized by using frequency spectrum technique. The results show that with increasing carbon black content, the composites exhibit capacitive and inductive features, respectively. On the basis of the observed experimental phenomena, an equivalent inductance - capacitance - resistance (LCR) parallel serial circuit model is proposed

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