Bibliographies thématiques / Insulating Matrix -Nanocomposites

Littérature scientifique sur le sujet « Insulating Matrix -Nanocomposites »

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Publié le 7 septembre 2023

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Articles de revues sur le sujet "Insulating Matrix -Nanocomposites"

Yu, Guang, Yujia Cheng et Zhuohua Duan. « Research Progress on Polymeric Inorganic Nanocomposites Insulating Materials ». Journal of Nanomaterials 2022 (3 décembre 2022) : 1–10. http://dx.doi.org/10.1155/2022/1757788.

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With the rapid development of power energy, electronic information, rail transit, and aerospace industries, nanocomposite dielectric materials have been widely used as new materials. Polymer/inorganic nanocomposite dielectric materials possess excellent physical and mechanical properties. In addition, numerous unique properties such as electricity, thermal, sound, light, and magnetic properties are exhibited by these materials. First, the macroscopic quantum tunneling effect, small-size effect, surface effect, and quantum-size effect of nanoparticles are introduced. There are a few anomalous changes in the physical and chemical properties of the matrix, which are caused by these effects. Second, the interaction mechanism between the nanoparticles and polymer matrix is introduced. These include infiltration adsorption theory, chemical bonding, diffusion theory, electrostatic theory, mechanical connection theory, deformation layer theory, and physical adsorption theory. The mechanism of action of the interface on the dielectric properties of the composites is summarized. These are the interface trap effect, interface barrier effect, and homogenization field strength effect. In addition, different interfacial structure models were used to analyze the specific properties of nanocomposite dielectric materials. Finally, the research status of the dielectric properties of nanocomposite dielectric materials is introduced.

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Park, Ji Sun, Young Sun Kim, Hyun-Jung Jung, Daseul Park, Jee Young Yoo, Jin Ho Nam et Yoon Jin Kim. « Polyethylene/Graphene Nanoplatelet Nanocomposite-Based Insulating Materials for Effective Reduction of Space Charge Accumulation in High-Voltage Direct-Current Cables ». Journal of Nanomaterials 2019 (24 mars 2019) : 1–11. http://dx.doi.org/10.1155/2019/9035297.

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We have demonstrated a straightforward hydrophobic surface modification of graphene nanoplatelets (GNPs) through a defect-healing process to fabricate well-dispersed insulating low-density polyethylene (LDPE)/GNP nanocomposites and have confirmed their effective suppression of space charge accumulation. Without any organic modifiers, GNPs containing oxygen-based functional groups at the edges were successfully reduced at optimal high-temperature defect-healing condition and modified to have hydrophobic surface properties similar to those of the LDPE matrix. The degree of dispersion and the reproducibility of the mechanically melt-mixed LDPE/GNP nanocomposites were immediately analyzed by thickness-normalized optical absorption measurement. In the LDPE matrix, below the percolation threshold concentration, well-dispersed GNP fillers effectively acted as trapping sites under high electric fields, resulting in the successful suppression of packet-like space charge accumulation (field enhancement factor=1.04 @ 0.1 wt% LDPE/GNP nanocomposite).

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Ramazanov, M. A., A. M. Rahimli et F. V. Hajiyeva. « The influence of titanium dioxide (TiO2) nanoparticles on the structure, optical and dielectric properties of polyvinyl chloride (PVC) ». Modern Physics Letters B 34, n^o 28 (10 juin 2020) : 2050310. http://dx.doi.org/10.1142/s0217984920503108.

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The tendency to improve the properties of insulating materials by incorporating inorganic nanoparticles has become necessary in order to design new insulation systems. In this study, PVC/TiO2-based nanocomposites with different loadings (3, 5 and 10 wt.%) of TiO2 nanoparticles were prepared by the solution mixing method. The morphology of the prepared nanocomposites was studied by Atomic Force Microscope (AFM). Experimentally, it was found that as the concentration increases, the size of the surface structural elements and particle size increases. Photoluminescence (PL) analysis of samples shows improvement compared to the pristine polymer. Furthermore, PL intensity for nanocomposites increases depending on the concentration and saturation occurs at a certain amount of titanium dioxide nanoparticles. The increase in luminescence intensity till a certain nanoparticle content is due to the growth of the luminescent surface area. Further saturation is explained by the increase in particle size with no increase or a slight reduction in surface area. Dielectric properties of nanocomposites were studied. It was found that dielectric permittivity of the materials increases as the nanoparticle volume content increases and it reaches at its highest value for the nanocomposites with 3% nanoparticle content. The optical properties of the polymer and nanocomposite films were studied in the region 200 nm to 600 nm. It was found that the PVC/TiO2 nanocomposites showed enhancement in the absorbance intensities which was more significant for the nanocomposites with higher nanoparticle content compared to the pristine polymer. Furthermore, absorption spectra were used to calculate the optical bandgap of the prepared nanocomposite films and redshift observed in the calculated values of bandgap for nanocomposites. Consequently, it was proved that by incorporating TiO2 nanoparticles into the polymer matrix, the spectral region of the samples can be expanded resulting in broadened application of such systems in various fields of science and technology.

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Lin, Jia Qi, Ying Liu, Wen Long Yang et Hui Lin. « Investigation on the Morphology and Dielectric Properties of PI/SiO₂ Nanocomposite Films ». Advanced Materials Research 1015 (août 2014) : 250–54. http://dx.doi.org/10.4028/www.scientific.net/amr.1015.250.

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Polyimide nanocomposite insulating materials are widely used in electrical and electron engineering owing to their outstanding electrical, mechanical, thermal, and wear-resistance properties. Polyimide/silica (PI/SiO2) nanocomposites have been prepared by the polymerization process of adding tetraethoxysilane (TEOS) and the coupling agent isocyanatopropyltriethoxysilane (ICTOS) in polyimide. The effects of SiO2addition on the microstructure and the dielectric property of nanocomposite films were investigated. It was found that the silica particles were well dispersed in PI matrix and the sizes of SiO2particles in the hybrid films range from 20 nm to 30 nm for 5-15 wt% SiO2loading in the matrix. The dielectric constant and the dielectric loss (tan δ) of these films increased with the increase of the content of silica particles.

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Zhou, Yongcun, Shihu Yu, Huan Niu et Feng Liu. « Synergistic Improvement in Thermal Conductivity of Polyimide Nanocomposite Films Using Boron Nitride Coated Copper Nanoparticles and Nanowires ». Polymers 10, n^o 12 (19 décembre 2018) : 1412. http://dx.doi.org/10.3390/polym10121412.

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Electronic devices are increasingly dense, underscoring the need for effective thermal management. A polyimide (PI) matrix nanocomposite film combining boron nitride (BN)-coated copper nanoparticles (CuNPs@BN) and nanowires (CuNWs@BN) was fabricated by a flexible and fast technique for enhanced thermal conductivity and the dielectric properties of nanocomposite films. The thermal conductivity of (CuNPs-CuNWs)@BN/PI composite comprising 10 wt % filler loading rose to 4.32 W/mK, indicating a nearly 24.1-fold increase relative to the value obtained for pure PI matrix. The relative permittivity and dielectric loss approximated 4.92 and 0.026 at 1 MHz, respectively. The results indicated that the surface modification of CuNPs and CuNWs by introducing a ceramic insulating layer BN effectively promoted the formation of thermal conductive networks of nanofillers in the PI matrix. This study enabled the identification of appropriate modifier fillers for polymer matrix nanocomposites to improve electronic applications.

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Sagar, Rohan, Akash Kumar, Rajesh Kumar Raghav et M. S. Gaur. « Investigations on Piezoelectric, Dielectric and Mechanical Properties of PVDF/PVC/GO Nanocomposites ». ECS Journal of Solid State Science and Technology 12, n^o 8 (1 août 2023) : 083011. http://dx.doi.org/10.1149/2162-8777/aceeb4.

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In this study, the hardness of polyvinylidene fluoride (PVDF), PVC and PVDF/PVC/GO (2.0 wt%) was estimated using piezoelectric and dielectric properties. The structure morphology was analyzed by Fourier transform infrared spectroscopy (FTIR). With the help of the solution casting technique, GO nanofiller were incorporated into PVDF/PVC matrix to prepare nanocomposites. In the case of PVDF/PVC/GO nanocomposites (2.0 wt%), the d33 coefficient is comparatively higher. PVDF have lower dielectric constant, however, may be due to interfacial polarization occurring at the spherulites and at the polymer/filler interfaces. The achieved lower loss tangent (tanδ) for PVDF compared to PVDF/PVC and PVDF/PVC/GO (2.0 wt%) nanocomposites is attributed to PVDF highly insulating nature. The PVDF/PVC/GO (2.0 wt%) nanocomposite exhibited a d33 value of ∼26 pm V−1, which was significantly higher than pure PVDF and PVDF/PVC.

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BUZNIKOV, N. A., I. T. IAKUBOV, A. L. RAKHMANOV, K. I. KUGEL et A. O. SBOYCHAKOV. « HIGH-FREQUENCY RESPONSE AND VOLTAGE NOISE IN MAGNETIC NANOCOMPOSITES ». International Journal of Modern Physics B 23, n^o 20n21 (20 août 2009) : 4216–33. http://dx.doi.org/10.1142/s0217979209063389.

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We study the noise spectra and high-frequency permeability of inhomogeneous magnetic materials consisting of single-domain magnetic nanoparticles embedded into an insulating matrix. Possible mechanisms of 1/f voltage noise in phase-separated manganites is analyzed. The material is modelled by a system of small ferromagnetic metallic droplets (magnetic polarons or ferrons) in insulating antiferromagnetic or paramagnetic matrix. The electron transport is related to tunnelling of charge carriers between droplets. One of the sources of the 1/f noise in such a system stems from fluctuations of the number of droplets with extra electron. In the case of strong magnetic anisotropy, the 1/f noise can arise also due to the fluctuations of the magnetic moments of ferrons. The high frequency magnetic permeability of nanocomposite film with magnetic particles in insulating non-magnetic matrix is studied in detail. The case of strong magnetic dipole interaction and strong magnetic anisotropy of ferromagnetic granules is considered. The composite is modelled by a cubic regular array of ferromagnetic particles. The high-frequency permeability tensor components are found as a functions of frequency, temperature, ferromagnetic phase content, and magnetic anisotropy. The results demonstrate that magnetic dipole interaction leads to a shift of the resonance frequencies towards higher values, and nanocomposite film could have rather high value of magnetic permeability in the microwave range.

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Yang, Jae Kyo, D. J. Park, J. Kim, Si Young Chang, Chung Hyo Lee, Tohru Sekino, Koichi Niihara et Yong Ho Choa. « Preparation and Evaluation of Metal/Ceramic Nanocomposites for High Frequency Inductive Devices ». Key Engineering Materials 317-318 (août 2006) : 869–72. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.869.

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Fe/MgO nanocomposites, which are applicable to high frequency electronic devices, were fabricated by ultrasonic spray pyrolysis and selective reduction processes. Transmission electron micrographs showed that nano ferromagnetic Fe particles were isolated by MgO insulating matrix. With the increase of the reduction temperature, the particle size and saturation magnetization of the nanocomposites increased, which resulted in the decrease of the coercive force and the increase of the permeability. Furthermore, the ferromagnetic resonance peak of the nanocomposites was not observed up to 9 GHz.

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Han, Long, Zhaobo Wang, Jing Hua et Jieting Geng. « Well-Distributed Polysilsesquioxane-Modified Carbon Nanotubes for Thermal Conductive Insulating Silicone Rubbers ». Advances in Polymer Technology 2022 (27 août 2022) : 1–9. http://dx.doi.org/10.1155/2022/9115873.

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Despite carbon nanotubes (CNTs) have garnered tremendous research interests for enhancing the electrical and thermal conductivity of polymers, it is still a considerable challenge to achieve the uniform dispersion of carbon nanotubes in polymer matrix. Herein, inspired by the mussel-inspired chemistry, we adopted the strategy of coating CNTs with polydopamine. And the polysilsesquioxane-modified CNTs (CNTs-PSQ) were obtained based on the click chemistry reaction. The FT-IR, Raman, XRD, and TGA collectively demonstrated the successful modification of PSQ on the surface of CNTs. The incorporation of PSQ could significantly improve the dispersion of CNTs in the silicon rubbers, and a strong interfacial interaction was formed between CNTs-PSQ and silicon rubber matrix, as observed from TEM images of silicon rubber/CNTs-PSQ nanocomposites. Meanwhile, compared with the nanocomposites with neat CNTs, the ones with CNTs-PSQ exhibited simultaneously improved electrical conductivity and insulating performance. This strategy proposed for the preparation of PSQ-modified CNTs provides insights toward highly insulating and thermal conducting polymers.

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Kim, Do-Kyung, Muhammet S. Toprak, Maria Mikhaylova, Yun Suk Jo, Steven J. Savage, Hyung Bock Lee, Thomas Tsakalakos et Mamoun Muhammed. « Polymeric Nanocomposites of Complex Ferrite ». Solid State Phenomena 99-100 (juillet 2004) : 165–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.99-100.165.

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The influence of mixtures of Ni0.5Zn0.4Cu0.1Fe2O4, CoFe2O4, and graphite on the permeability, permittivity and microwave absorption properties in a composite embedded with insulating polymeric matrix, that can be used for X- and P-band radar absorption, has been investigated. Thermodynamic modelling of the complex ferrite system has been demonstrated by the controlled simultaneous coprecipitation of all ions inolved in the composite in the selected working pH ranges. The method employed is very convenient for the synthesis of multicomponent systems with a homogenous distribution of compositions.

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Chapitres de livres sur le sujet "Insulating Matrix -Nanocomposites"

J. Cruz-Delgado, Víctor, Janett A. Valdez-Garza, José M. Mata-Padilla, Juan G. Martínez-Colunga et Carlos A. Ávila-Orta. « Preparation and Characterization of Electrically Conductive Polymer Nanocomposites with Different Carbon Nanoparticles ». Dans Carbon Nanotubes - Redefining the World of Electronics [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95912.

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Carbon nanoparticles possess a combination of high electrical and thermal transport properties, as well as low density and different morphologies that make them a good choice to reinforce plastics. Polymer nanocomposites offer great expectations for new and unexpected applications due to the possibility of changing their electrical/thermal behavior by adding nanoparticles while retaining the flexibility and processability of plastics. The possibility of electrical and thermal conduction in a polymer matrix with low amounts of nanoparticles brings opportunity for high demanding applications such as electrical conductors, heat exchangers, sensors, and actuators. Polyolefin nanocomposites offer a significant challenge due to their insulative nature and low affinity for carbon nanoparticles; due to the latter, new production tendencies are proposed and investigated.

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Varghese, Harris, T. K. Abhilash et Achu Chandran. « Ferroelectric Liquid Crystal Nanocomposite for Optical Memory and Next Generation Display Applications ». Dans Current and Future Developments in Nanomaterials and Carbon Nanotubes, 205–22. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815050714122030015.

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The dispersion of nanomaterials in ferroelectric liquid crystals (FLC) has turned out to be a promising method for fabricating optical memory devices and tuneable electro-optical materials. In a nanosuspension between FLC and nanoparticles, the presence of the dopant particles creates a synergic interaction with host FLC, which leads to the improvement of electro-optical properties. Tailoring with nanoparticles of suitable size, concentration, and compatibility results in various fascinating effects and new multifaceted composites for electro-optical devices. Adding nano-sized materials such as metallic, semiconducting, insulating or other functional species into the FLC matrix is a fertile method, giving rise to or increases in memory retention and other electro-optical properties that can replace the current electro-optical devices. These advancements depend on the harmony between the guest and host materials. This chapter gives a comprehensive overview of the present technologies and enhancements that have been acquired in nanoparticle/FLC composite systems, especially for optical memory devices and display applications.

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Actes de conférences sur le sujet "Insulating Matrix -Nanocomposites"

Zhi-Min Dang, Jun-Wei Zha, Khurram Shehzad et Jing Zhang. « Mechanism and properties of piezoresistive in rubber-matrix nanocomposites ». Dans 2011 International Symposium on Electrical Insulating Materials (ISEIM). IEEE, 2011. http://dx.doi.org/10.1109/iseim.2011.6826324.

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