Article
Materials Science, Composites
I. Y. Forero-Sandoval, F. Cervantes-Alvarez, J. A. Ramirez-Rincon, J. D. Macias, N. W. Pech-May, J. Ordonez-Miranda, J. J. Alvarado-Gil
Summary: The research shows that thermal and electrical conductivities of composite materials increase with filler concentration, while emissivity decreases. The percolation thresholds of these properties vary at different volume fractions, indicating the effectiveness of the percolation phenomenon in modifying the physical properties of particulate composites.
APPLIED COMPOSITE MATERIALS
(2021)
Article
Chemistry, Physical
Shaohua Chen, Qiang Liu, Larissa Gorbatikh, David Seveno
Summary: The formation of covalently bonded inter-graphene junctions is crucial for significantly improving the thermal conductivity of graphene-reinforced polymer composites.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Muhammad A. Munawar, Dirk W. Schubert
Summary: Using electrospinning, highly oriented conductive nanofibers were produced by increasing the filler proportion, leading to higher conductivity in ECFCs. A calculation method was developed to determine the conductivity and electrical percolation thresholds of nanofibers. Annealing process increased conductive channels within ECFCs, enhancing conductivity and reducing percolation thresholds.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Materials Science, Composites
Zaiwei Li, Long-yuan Li
Summary: This paper presents a simple approach for calculating the effective electrical conductivity of carbon nanotubes-reinforced two-phase composite materials. The approach takes into account the effect of percolation threshold by modifying the traditional effective medium approximation. The predicted electrical conductivity is validated using published experimental results.
COMPOSITES COMMUNICATIONS
(2022)
Article
Chemistry, Physical
T. Khan, M. S. Irfan, M. Ali, Y. Dong, S. Ramakrishna, R. Umer
Summary: Electrically conductive polypropylene nanocomposites containing carbon-based nanofillers are widely used in various applications. Achieving low percolation threshold is crucial for mechanical properties, optical transparency, and cost-effectiveness. Different parameters and post-processing techniques influence electrical conductivity and percolation threshold.
Article
Materials Science, Composites
Shichao Sun, Weiyu Cao
Summary: This study investigates the impact of microstructure on the conductivity of pre-oxidized polyacrylonitrile precursor fibers (POF) during pre-carbonization. The results show that a carbon skeleton consisting of connected pseudo-graphite sheets (PGS) is formed during the pre-carbonization process, which significantly affects heat conduction and the subsequent crystallization and properties of carbon fiber.
COMPOSITES COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Muhammad A. Munawar, Dirk W. Schubert
Summary: This study presents a reliable approach to determine the electrical conductivity and elasticity of highly oriented electrospun conductive nanofibers of biopolymers. The filler-matrix interaction and molar mass of host polymer are found to be crucial factors affecting the fiber diameter and electrical percolation thresholds of the nanofibers. Additionally, factors such as molar mass of biopolymer, storage time, and annealing temperature play significant roles in controlling the conductivity of the fibers.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Liberata Guadagno, Patrizia Lamberti, Vincenzo Tucci, Luigi Vertuccio
Summary: Epoxy resins containing multi-wall carbon nanotubes are suitable for manufacturing self-sensing materials in automotive and aeronautic sectors. The choice between different epoxy precursors can significantly impact the crosslinking density and overall performance of the material, making it essential to consider practical application requirements.
Article
Materials Science, Characterization & Testing
Gu-Hyeok Kang, Myungsoo Kim, Young-Bin Park
Summary: The study suggests that a GB-CNT/PA6 multiscale hybrid composite can be used to create a network structure with controllable electrical conductivity, making it a promising material for practical applications. The paper introduces a new method for controlling electrical conductivity by creating a segregated network morphology (SNM) using a GB-CNT/PA6 composite. The addition of GB reduces the required CNT concentration, making the process more economical, and the SNM approach leads to a significant increase in electrical conductivity.
Article
Materials Science, Multidisciplinary
I. Ouni, H. Ben Khlifa, R. M'nassri, Muaffaq. M. Nofal, Elham M. A. Dannoun, H. Rahmouni, K. Khirouni, A. Cheikhrouhou
Summary: The study investigates the effects of substituting sodium with potassium on the electrical and dielectric properties of GdFeO3-type manganites. The introduction of potassium led to a metal-semiconductor transition in the samples, reducing resistivity while not affecting the metal-semiconductor temperature transition. The materials show potential for specific applications, with significant temperature coefficient of resistance values.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Review
Materials Science, Multidisciplinary
Xiaoting Song, Guangyue Shi, Guohua Fan, Yao Liu, Runhua Fan
Summary: Percolating graphene/poly(vinylidene fluoride) (GR/PVDF) composites were fabricated via hot-pressing, exhibiting negative permittivity and low percolation threshold. The negative permittivity was attributed to the low-frequency plasma oscillation of free charges, analyzed through the universal regulatory mechanism of the Drude model. Rapid formative 3D GR conductive networks contributed to the low percolation threshold and metal-like behavior.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
M. Benamara, J. Massoudi, H. Dahman, A. Ly, E. Dhahri, M. Debliquy, L. El Mir, D. Lahem
Summary: Zinc oxide nanopowder was synthesized by auto-combustion and oxygen vacancies were induced by thermal activation. The structural, morphological, and optical properties of the samples were characterized by XRD, Raman spectroscopy, XPS, and SEM. The results showed that the introduction of oxygen vacancies enhanced the absorption and decreased the conductivity of the material. Gas sensors based on the nanoparticles exhibited excellent sensing response to NO2.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Applied
Camila Aparecida Zimmermann, Giseli Contri, Silvia Daniela Araujo da Silva Ramoa, Luiz Gustavo Ecco, Guilherme Mariz de Oliveira Barra
Summary: This study investigates the anticorrosion properties of a waterborne polyurethane dispersion containing polyaniline and discusses the concept of electrical percolation threshold. The results show that the mixture reaches the electrical percolation threshold at a polyaniline:PSS content of 6%. The coatings prepared below this threshold exhibit good hydrophobicity, adhesion, and electrical properties, while the coatings prepared at or above the threshold show porosity, poor adhesion, and signs of active corrosion. The optimal anticorrosion performance is achieved at a polyaniline:PSS content of 3%.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Materials Science, Composites
Jianlong Wu, Wenyi Wang, Xingyu Chen, Ning Li
Summary: The study introduced a novel method of producing segregated conductive composites for antistatic and EMI shielding applications by utilizing a solution-mechanical mixing approach. The segregated composites showed lower surface resistivity and higher tensile strength compared to composites prepared by melt and solution mixing methods. Additionally, the EMI shielding values of the segregated composites were significantly higher than those of uniform structure composites.
POLYMER COMPOSITES
(2021)
Article
Materials Science, Multidisciplinary
Yasser Zare, Kyong Yop Rhee, Soo-Jin Park
Summary: This study presents a two-stage simulation to investigate the tensile strength of polymer systems reinforced with carbon nanotubes (CNT). It explores the mechanical percolation onset and networking of the interphase zone. The results show that the strength of the nanocomposites is influenced by the interphase properties and the dimensions of the CNTs.