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The prepared CA significantly improved the conductivity of cement-based materials, and the modification effect was and related to the altered microstructure of cement matrix and conductive network established by CA, and can be characterized by GEM model.
PTC effect may arise from a difference in thermal expansion coefficient between the polymer matrix and conductive fillers.
The assumed (resistive) matrix and (conductive) fluid-filled pore geometry is either an assemblage of spheres or a cubic network of fractures, for which exact expressions have been derived (Waff 1974) and were used for calculations.
In this work, we propose a comprehensive multi-scale three-dimensional (3D) resistor network numerical model to predict the piezoresistivity behavior of a nanocomposite material composed of an insulating polymer matrix and conductive carbon nanotubes (CNTs).
The present numerical results can provide valuable information for designing highly sensitive resistance-type strain sensors made from various nanocomposites composed of an insulating polymer matrix and conductive nanofillers.
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Electrical transport properties of saturated porous media, such as soils, rocks and fractured networks, typically composed of a non-conductive solid matrix and a conductive brine in the pore space, have numerous applications in reservoir engineering and petrophysics.
At the level of the saturated zone the hydraulic conductivity of the matrix and highly conductive zone representing the conduit are dominant parameters influencing the spring response.
The composites that consist of an insulating matrix and fine conductive filler have generated significant research interest, mostly due to their electrical conductivity.
It presents good activity and stability towards hydrogen evolution reaction, which is attributed to the efficient mass and electron transport from the intimate contact among Ir nanoparticles, ordered mesoporous carbon matrix and 3D conductive substrate.
The current map (Figure3a) reveals highly resistive regions (black) corresponding to the polymer matrix and highly conductive regions (red, green, and blue) corresponding to CNTs.
As a result, we have an improvement of the dispersion of the filler in the polymer matrix and new conductive chains are formed in the composites.
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