scholarly journals Development of metal–graphene-filled hybrid composites: Characterization of mechanical, thermal, and electrical properties

2018 ◽  
Vol 53 (24) ◽  
pp. 3363-3376 ◽  
Author(s):  
Saeed Doagou Rad ◽  
Aminul Islam ◽  
Ammar Alnasser
Keyword(s):  
Thermal Conductivity ◽  
Hybrid Composites ◽  
Polyamide 6 ◽  
Graphene Nanoplatelets ◽  
Electrically Conductive ◽  
Electron Microscopies ◽  
Annealing Step ◽  
Electrical Conductivities ◽  
Thermal And Electrical Properties

Production and properties of thermally and electrically conductive polymeric composites containing conductive micro and nano fillers are investigated. Mechanical, electrical, and thermal properties of the produced nano and hybrid Polyamide 6–based composites filled with graphene nanoplatelets and metal microfibers are studied. The influence of nanofiller content and geometrical characteristics on the thermal conductivity of the composites are studied through experiments and finite element modeling. The results show the influence of nanoplatelets aspect ratio and lateral dimension on the thermal conductivity of the composites. Furthermore, combination of graphene nanoplatelets and metallic micro-scale fillers leads to significant improvements in thermal and electrical conductivities. In fact, graphene nanoplatelets act as conductive bridges in minuscule gaps to increase the number of contacts in the constructed network. The combination of the two different fillers increased the mechanical properties up to 120% compared to the metal reinforced composites, indicating stronger interfaces between the fillers and polymeric matrix. Rheological investigations also confirm the effectiveness of hybridization. Furthermore, the influence of annealing on the conductivities of the specimens are studied. Adding an annealing step following the nanofiller inclusion within the composites resulted in 151 and 72% enhancement in the thermal and electrical conductivities, respectively. Stress relaxation and reorientation of metal fibers in combination with additionally constructed nanofiller networks have been attributed to the observed enhancements. The involved mechanisms in the observed behaviors are studied using optical and electron microscopies.

scholarly journals Thermal and Quasi-Static Mechanical Characterization of Polyamide 6-Graphene Nanoplatelets Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1454
Author(s):  
Pietro Russo ◽  
Francesca Cimino ◽  
Antonio Tufano ◽  
Francesco Fabbrocino
Keyword(s):  
Chemical Resistance ◽  
Experimental Tests ◽  
Polyamide 6 ◽  
Graphene Nanoplatelets ◽  
Strength Parameter ◽  
Melt Compounding ◽  
Static Mechanical ◽  
Thermal And Electrical Properties ◽  
Multifunctional Products

The growing demand for lightweight and multifunctional products in numerous industrial fields has recently fuelled a growing interest in the development of materials based on polymer matrices including graphene-like particles, intrinsically characterized by outstanding mechanical, thermal, and electrical properties. Specifically, with regard to one of the main mass sectors, which is the automotive, there has been a significant increase in the use of reinforced polyamides for underhood applications and fuel systems thanks to their thermal and chemical resistance. In this frame, polyamide 6 (PA6) composites filled with graphene nanoplatelets (GNPs) were obtained by melt-compounding and compared in terms of thermal and mechanical properties with the neat matrix processed under the same condition. The results of the experimental tests have shown that the formulations studied so far offer slight improvements in terms of thermal stability but much more appreciable benefits regarding both tensile and flexural parameters with respect to the reference material. Among these effects, the influence of the filler content on the strength parameter is noteworthy. However, the predictable worsening of the graphene sheet dispersion for GNPs contents greater than 3%, as witnessed by scanning electron images of the tensile fractured sections of specimens, affected the ultimate performance of the more concentrated formulation.

Preparation and Characterization of GNP/Nylon Composites

2014 ◽  
Vol 556-562 ◽  
pp. 339-342 ◽  
Author(s):  
Bao Feng Xu ◽  
Zhi Dan Lin ◽  
Jiang Ming Chen ◽  
Jun Lin
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Graphene Nanoplatelets ◽  
Melt Blending ◽  
Blending Method

Graphene nanoplatelets (GNP) and nylon (PA) have been often used as thermal filler and matrix and respectively to produce composites. In this work, PA6/PA66/GNP thermal composites were prepared via a melt blending method. Mechanical properties, morphology, and thermal properties of PA6/PA66/GNP composites were investigated. Because the GNP is very expensive, we investigated to use Al2O3 and graphite and examined the characteristics of the prepared composites. Thermal conductivity values of PA6/PA66/GNP composites remarkably increased with increase of GNP contents mainly via layered dispersion in nylon matrix. The thermal conductivity of composite containing 50 wt % of GNP was measured as 5.03 W·m–1·K–1 at 30 °C, indicating an increase of more than 15 times compared with that of the neat PA6. When the Al2O3 was replaced for GNP, the thermal conductivity of composites decreased, but the mechanical properties improved. When graphite was used to replace for GNP, thermal conductivity basically remained unchanged but mechanical properties decreased.

Effect of hybrid-SiO2 particles on characterization of EPDM and silicone rubber composites for outdoor high-voltage insulations

2017 ◽  
Vol 37 (7) ◽  
pp. 671-680 ◽  
Author(s):  
Hidayatullah Khan ◽  
Muhammad Amin ◽  
Muhammad Yasin ◽  
Muhammad Ali ◽  
Ayaz Ahmad
Keyword(s):  
High Voltage ◽  
Silicone Rubber ◽  
Hybrid Composites ◽  
Standard Procedure ◽  
Research Work ◽  
Dielectric Strength ◽  
Hybrid Silica ◽  
Roll Mill ◽  
Thermal And Electrical Properties

Abstract Ethylene propylene diene monomer (EPDM) and silicone rubber (SiR) are well-known polymers for high-voltage (HV) outdoor applications. In this research work, the effect of hybrid SiO2 (a mixture of 15% microsized and 5% nanosized silica) has been investigated on the mechanical, thermal, and electrical properties of EPDM and SiR composites. Using the ASTM standard procedure, the EPDM and SiR composites filled with hybrid silica were compounded by two roll mill and simple blending techniques, respectively. It was observed that with the addition of hybrid SiO2, the composites exhibited improved tensile strength of ~2500 kPa, reduced elongation at break, and enhanced hardness. The samples filled with SiR hybrid silica showed higher thermal stability and volume/surface resistivities relative to EPDM hybrid composites. However, EPDM hybrid composites showed higher dielectric strength of ~23.4 kV/mm as compared with SiR composites. From these characterization results, it can be suggested that SiR hybrid composites are more suitable for outdoor HV insulation applications.

Mechanical and low velocity impact characterization of carbon/glass hybrid composites with graphene nanoplatelets

2019 ◽  
Vol 6 (8) ◽  
pp. 085304 ◽  
Author(s):  
Nurettin Furkan Doğan ◽  
Mehmet Bulut ◽  
Ahmet Erkliğ ◽  
Ömer Yavuz Bozkurt
Keyword(s):  
Hybrid Composites ◽  
Graphene Nanoplatelets ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact

Fabrication and Microstructure of Electrically Conductive AlN with High Thermal Conductivity

2011 ◽  
Vol 484 ◽  
pp. 57-60
Author(s):  
Takafumi Kusunose ◽  
Tohru Sekino ◽  
Koiichi Niihara
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Rare Earth ◽  
Sintering Temperature ◽  
Rare Earth Oxide ◽  
High Thermal Conductivity ◽  
Boundary Phase ◽  
Sudden Increase ◽  
Electrically Conductive ◽  
Electrical Conductivities

The electrically conductive AlN with high thermal conductivity were successfully fabricated by sintering AlN with a composite additive of 1wt.% Y2O3 and 4wt.% CeO2 in carbon-reduced atmosphere at over 1600 °C. The sudden increase in electrical conductivity is thought to be caused by transition of grain boundary phase from rare-earth oxide to rare-earth oxycarbide. Their electrical conductivities and thermal conductivities increased with increasing sintering temperature. Additionally, sintering temperature influenced the resultant microstructures.

scholarly journals Electrical and Thermal Characterization of Electrospun PVP Nanocomposite Fibers

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Waseem S. Khan ◽  
Ramazan Asmatulu ◽  
Mohamed M. Eltabey
Keyword(s):  
Electrical Resistance ◽  
Multiwall Carbon Nanotubes ◽  
Thermal Characterization ◽  
Industrial Applications ◽  
Electrospinning Process ◽  
Electrically Conductive ◽  
Electrical Conductivities ◽  
Process System ◽  
Nanocomposite Fibers

Polyvinylpyrrolidone (PVP) solutions incorporated with multiwall carbon nanotubes (MWCNTs) were electrospun at various weight percentages, and then the electrical resistance and some thermal properties of these nanocomposite fibers were determined using a high-accuracy electrical resistance measurement device. During the electrospinning process, system and process parameters, such as concentrations, applied voltage, tip-to-collector distance, and pump speeds, were optimized to receive the consistent nanocomposite fibers. When polymers are used in many industrial applications, they require high electrical and thermal conductivities. Most polymers exhibit low electrical conductivity values; however, in the presence of conductive inclusions, the electrical resistance of the MWCNT fibers was reduced from 50 MΩ to below 5 MΩ, which may be attributed to the higher electrical conductivities of these nanoscale inclusions and fewer voids under the applied loads. This study may open up new possibilities in the field for developing electrically conductive novel nanomaterials and devices for various scientific and technological applications.

Measurements of the Thermal Conductivity of Individual α-Tetragonal Boron Nanoribbons

2011 ◽  
Author(s):  
Juekuan Yang ◽  
Scott W. Waltermire ◽  
Yang Yang ◽  
Deyu Li ◽  
Xiaoxia Wu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Silicon Nanowires ◽  
Complex Structures ◽  
One Dimensional ◽  
Seebeck Coefficients ◽  
Electrical Conductivities ◽  
Mechanical Devices ◽  
Property Characterization

Boron-based materials (i.e., boron and its borides) are mostly semiconductors with complex structures. These structures are characterized by an arrangement of an icosahedral cluster of B12 atoms [1]. The complexity of the crystal structure gives boron-based material a high melting point and low thermal conductivity at high temperature. On the other hand, the Seebeck coefficients and electrical conductivities of most bulk boron-based materials increase as temperature increases. Therefore, bulk boron-based materials are good candidates for high-temperature thermoelectric applications [2]. Due to the unique properties of bulk boron-based materials, one-dimensional nanostructures of boron-based materials have also attracted much attention, and various boron-based nanostructures have been synthesized recently [3]. These boron-based nanostructures are projected to be promising materials for novel nanoelectronic and nanoelectro-mechanical devices, as well as high temperature thermoelectric materials. However, compared to the extensive studies of carbon nanotubes and silicon nanowires, little has been done on the property characterization of boron and boride nanostructures.

Thermal and Electrical Properties of 3.2 nm Thin Gold Films Coated on Alginate Fiber

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Hua Dong ◽  
Ranran Chen ◽  
Yongqiang Mu ◽  
Shouting Liu ◽  
Jingkui Zhang ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Electron Scattering ◽  
Bulk Material ◽  
Gold Films ◽  
Metallic Thin Films ◽  
Lorenz Number ◽  
Electrical Conductivities ◽  
Thermal And Electrical Properties ◽  
Alginate Fiber

The thermal transport in metallic thin films can be reduced by the electron scattering and there are very little available knowledge that can be used to explain the mechanism. In this work, we characterized the thermal and electron transport of 3.2 nm thin gold films coated on alginate fiber by the transient electrothermal (TET) technique. The results reveal that the thermal and electrical conductivities are reduced significantly from the respective values of bulk material by 76.2% and 93.9%. At the same time, the Lorenz number is calculated as 8.66 × 10−8 W Ω K−2 and it is almost three times increased from the value of bulk material. The intrinsic thermal diffusivity of alginate fiber is 3.25 × 10−7 m2 s−1 and the thermal conductivity is 0.51 W m−1 K−1.

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