Dielectric Properties of Polymer Composites with Nanocarbon Allotropes

2019 ◽  
Vol 3 (2) ◽  
pp. 85-97
Author(s):  
Vitaliy G. Shevchenko ◽  
Polina M. Nedorezova ◽  
Alexander N. Ozerin
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Electrical Properties ◽  
Electromagnetic Radiation ◽  
Polymer Composites ◽  
Polymer Nanocomposites ◽  
Interfacial Polarization ◽  
Ac Electrical Conductivity ◽  
Practical Applications ◽  
Carbon Allotropes

Background:The paper describes the types and electrical properties of polymer nanocomposites containing carbon allotropes.Objective:Direct current conductivity, conduction in percolation systems, conduction mechanisms and factors controlling conductivity and percolation parameters are considered.Method:The dielectric properties of polymer nanocomposites are presented, and experimental methods and methods for analyzing the results have also been described. An analysis of the data on ac electrical conductivity, including the contribution of nanofiller - interfacial polarization is presented. Special consideration is given to the role of nanocarbons as dielectric probes.Results:The microwave properties of polymer nanocomposites, their use to estimate the distribution of nanofiller in the matrix, as well as practical applications for shielding and absorption of electromagnetic radiation have been analyzed.Conclusion:The use of carbon allotropes nanoparticles as fillers with high electrical conductivity provides polymer composites with useful electrical properties, including the ability to absorb highfrequency electromagnetic radiation.

Electrical Properties of Sustainable Nano-Composites Containing Nano-Fillers: Dielectric Properties and Electrical Conductivity

2019 ◽  
pp. 899-914
Author(s):  
Sabzoi Nizamuddin ◽  
Sabzoi Maryam ◽  
Humair Ahmed Baloch ◽  
M. T. H. Siddiqui ◽  
Pooja Takkalkar ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Electrical Properties ◽  
Nano Composites

scholarly journals Fabrication and studying the dielectric properties of (polystyrene-copper oxide) nanocomposites for piezoelectric application

2019 ◽  
Vol 8 (1) ◽  
pp. 52-57 ◽  
Author(s):  
Dalal Hassan ◽  
Ahmed Hashim Ah-yasari
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Electrical Properties ◽  
Dielectric Loss ◽  
Copper Oxide ◽  
Electrical Resistance ◽  
Copper Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Increase With Increase

The preparation of (polystyrene-copper oxide) nanocomposites have been investigated for piezoelectric application. The copper oxide nanoparticles were added to polystyrene by different concentrations are (0, 4, 8 and 12) wt.%. The structural and A.C electrical properties of (PS-CuO) nanocomposites were studied. The results showed that the dielectric constant and dielectric loss of (PS-CuO) nanocomposites decrease with increase in frequency. The A.C electrical conductivity increases with increase in frequency. The dielectric constant, dielectric loss and A.C electrical conductivity of polystyrene increase with increase in copper oxide nanoparticles concentrations. The results of piezoelectric application showed that the electrical resistance of (PS-CuO) nanocomposites decreases with increase in pressure.

scholarly journals Novel Pressure Sensors Made from Nanocomposites (Biodegradable Polymers–Metal Oxide Nanoparticles): Fabrication and Characterization

2018 ◽  
Vol 63 (8) ◽  
pp. 754 ◽  
Author(s):  
A. Hashim ◽  
A. Hadi
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Low Cost ◽  
Metal Oxide Nanoparticles ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Oxide Nanoparticles ◽  
Ac Electrical Conductivity ◽  
Dc Electrical Conductivity ◽  
Pressure Sensitive

This paper aims to the preparation of novel pressure-sensitive nanocomposites with low cost, light weight, and good sensitivity. The nanocomposites of polyvinyl alcohol, polyacrylic acid, and lead oxide nanoparticles have been investigated. The dielectric properties and dc electrical conductivity of (PVA–PAA–PbO2) nanocomposites have been studied. The dielectric properties of nanocomposites were measured in the frequency range (100 Hz–5 MHz). The experimental results showed that the dielectric constant and dielectric loss of (PVA–PAA–PbO2) nanocomposites decrease, as the frequency increases, and they increase with the concentrations of PbO2 nanoparticles. The ac electrical conductivity of (PVA–PAA–PbO2) nanocomposites increases with the frequency and the concentrations of PbO2 nanoparticles. The dc electrical conductivity of (PVA–PAA–PbO2) nanocomposites also increases with the concentrations of PbO2 nanoparticles. The application of pressure-sensitive nanocomposites has been examined in the pressure interval (60–200) bar. The results showed that the electrical resistance of (PVA–PAA–PbO2) pressure-sensitive nanocomposites decreases, as the compressive stress increases. The (PVA–PAA–PbO2) nanocomposites have high sensitivity to pressure.

scholarly journals Thermal, Morphological, Electrical Properties and Touch-Sensor Application of Conductive Carbon Black-Filled Polyamide Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3103
Author(s):  
Valentina Brunella ◽  
Beatrice Gaia Rossatto ◽  
Domenica Scarano ◽  
Federico Cesano
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Carbon Black ◽  
Polymer Composites ◽  
Thermal Analyses ◽  
Polyamide 66 ◽  
Electrical Measurements ◽  
Scanning Calorimetry ◽  
Carbon Filler ◽  
Conductive Composites

Polyamide 66 (PA66) is a well-known engineering thermoplastic polymer, primarily employed in polymer composites with fillers and additives of different nature and dimensionality (1D, 2D and 3D) used as alternatives to metals in various technological applications. In this work, carbon black (CB), a conductive nanofiller, was used to reinforce the PA66 polymer in the 9–27 wt. % CB loading range. The reason for choosing CB was intrinsically associated with its nature: a nanostructured carbon filler, whose agglomeration characteristics affect the electrical properties of the polymer composites. Crystallinity, phase composition, thermal behaviour, morphology, microstructure, and electrical conductivity, which are all properties engendered by nanofiller dispersion in the polymer, were investigated using thermal analyses (thermogravimetry and differential scanning calorimetry), microscopies (scanning electron and atomic force microscopies), and electrical conductivity measurements. Interestingly, direct current (DC) electrical measurements and conductive-AFM mapping through the samples enable visualization of the percolation paths and the ability of CB nanoparticles to form aggregates that work as conductive electrical pathways beyond the electrical percolation threshold. This finding provides the opportunities to investigate the degree of filler dispersion occurring during the transformation processes, while the results of the electrical properties also contribute to enabling the use of such conductive composites in sensor and device applications. In this regard, the results presented in this paper provide evidence that conductive carbon-filled polymer composites can work as touch sensors when they are connected with conventional low-power electronics and controlled by inexpensive and commercially available microcontrollers.

scholarly journals Effect of reduced graphene oxide (rGO) compaction degree and concentration on rGO-polymer composites printability and cell interactions

2021 ◽  
Author(s):  
Maria Camara Torres ◽  
Ravi Sinha ◽  
Siamak Eqtesadi ◽  
Rune Wendelbo ◽  
Marco Scatto ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Electrical Properties ◽  
Bulk Density ◽  
Polymer Composites ◽  
Reduced Graphene Oxide ◽  
Volume Fraction ◽  
Scale Production ◽  
Melt Compounding ◽  
Reduced Graphene

Graphene derivatives combined with polymers have attracted enormous attention for bone tissue engineering applications. Among others, reduced graphene oxide (rGO) is one of the preferred graphene-based fillers for the preparation of composites via melt compounding, and their further processing into 3D scaffolds, due to its established large-scale production method, thermal stability, and electrical conductivity. In this study, rGO (low bulk density 10g/L) was compacted by densification using a solvent (either acetone or water) prior to melt compounding, to simplify its handling and dosing into a twin-screw extrusion system. The effects of rGO bulk density (medium and high), densification solvent, and rGO concentration (3, 10 and 15% in weight) on rGO dispersion within the composite, electrical conductivity, printability and cell-material interactions were studied. High bulk density rGO (90 g/L) occupied a low volume fraction within polymer composites, offering poor electrical properties but a reproducible printability up to 15 wt% rGO. On the other hand, the volume fraction within the composites of medium bulk density rGO (50 g/L) was higher for a given concentration, enhancing rGO particle interactions and leading to enhanced electrical conductivity, but compromising the printability window. For a given bulk density (50 g/L), rGO densified in water was more compacted and offered poorer dispersability within the polymer than rGO densified in acetone, and resulted in scaffolds with poor layer bonding or even lack of printability at high rGO percentages. A balance in printability and electrical properties was obtained for composites with medium bulk density rGO densified in acetone. Here, increasing rGO concentration led to more hydrophilic composites with a noticeable increase in protein adsorption. Moreover, scaffolds prepared with such composites presented antimicrobial properties even at low rGO contents (3 wt%). In addition, the viability and proliferation of human mesenchymal stromal cells (hMSCs) was maintained on scaffolds with up to 15% rGO and with enhanced osteogenic differentiation on 3% rGO scaffolds.

AC electrical conductivity and dielectric properties of doping induced molecular ferroelectric diisopropylammonium bromide

2019 ◽  
Vol 6 (9) ◽  
pp. 096306
Author(s):  
Ekramul Kabir ◽  
M Khatun ◽  
Raihan J Mustafa ◽  
Kiran Singh ◽  
Muklesur Rahman
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Ac Electrical Conductivity
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