Mechanical, electrical, and electromagnetic properties of hybrid graphene/glass fiber/epoxy composite

2019 ◽  
Vol 27 (5) ◽  
pp. 262-267 ◽  
Author(s):  
Kamila Kunrath ◽  
Eduardo Fischer Kerche ◽  
Mirabel Cerqueira Rezende ◽  
Sandro Campos Amico
Keyword(s):  
Electrical Conductivity ◽  
Glass Fiber ◽  
Epoxy Composite ◽  
Low Cost ◽  
Electromagnetic Properties ◽  
Radar Absorbing Material ◽  
Flexural Testing ◽  
Low Concentrations ◽  
Absorbing Material ◽  
Graphene Glass

This study presents the development of a novel three-component composite based on glass fiber/epoxy resin/graphene nanoplatelets (GNPs) aiming to obtain radar absorbing material (RAM). The composite was produced by vacuum-assisted resin transfer molding and characterized under tensile and flexural testing, reflectivity, and electrical conductivity analyses. The mechanical properties were not significantly affected by the incorporation of GNP nanofiller. However, electrical conductivity of the three-component composites increased sharply and the percolation threshold was reached with around 3 wt% GNP (surface conductivity) and 4 wt% GNP (volumetric conductivity). Furthermore, reflectivity showed excellent attenuation (up to 99.99%) in the 8.2–12.4 GHz frequency range. These attenuation levels were obtained even at low concentrations (0.1 wt%) of GNP nanofiller, indicating the possibility of producing composites with low cost and easy processing for advanced applications as RAMs.

Core–Shell Chain-Like Cu@Ni Composite with Dual Absorption Peaks to Improve Microwave Absorption Properties

NANO ◽  
2018 ◽  
Vol 13 (05) ◽  
pp. 1850052
Author(s):  
Yuanyuan Zhou ◽  
Jianying Deng ◽  
Shimei Li ◽  
Zefeng Li
Keyword(s):  
Hydrothermal Reaction ◽  
Low Cost ◽  
Electromagnetic Properties ◽  
Formation Mechanisms ◽  
Core Shell ◽  
The Novel ◽  
Redox Potentials ◽  
X Ray Diffraction ◽  
Ni Alloy ◽  
Absorbing Material

Core–shell Cu@Ni chains were successfully synthesized through a mild hydrothermal reaction. The morphology, structure and microwave electromagnetic properties of the composite were then characterized by X-ray diffraction, energy-dispersive spectroscopy, scanning electron microscopy and vector network analysis. The formation mechanisms of the core–shell structure and one-dimensional chains were ascribed to the varying redox potentials of Cu and Ni ions and the magnetic dipole–dipole attraction. Furthermore, a minimal reflection loss (RL) of [Formula: see text]20.7[Formula: see text]dB was observed at 9.6[Formula: see text]GHz with a thickness of 2.0[Formula: see text]mm and the effective absorption ([Formula: see text]10[Formula: see text]dB, 90% microwave attenuation) bandwidth can be adjusted between 5.2[Formula: see text]GHz and 16.6[Formula: see text]GHz for the thin absorber thickness of 2.0–4.0[Formula: see text]mm. The novel core–shell chain-like Cu@Ni alloy can be used as a promising absorbing material because it shows numerous features such as thin thickness, strong absorption, low cost and lightweight.

Evaluation of thermal stability and damping behavior of electrical insulator waste reinforced thermoset polymer composite

2019 ◽  
Vol 233 (10) ◽  
pp. 3603-3618 ◽  
Author(s):  
P Sabarinathan ◽  
VE Annamalai ◽  
K Rajkumar
Keyword(s):  
Thermal Stability ◽  
Water Absorption ◽  
Glass Fiber ◽  
Epoxy Composite ◽  
Low Cost ◽  
Dynamic Mechanical Properties ◽  
Particle Dispersion ◽  
Electrical Insulator ◽  
Glass Fiber Reinforced ◽  
Damping Behavior

This paper deals with the influence of inorganic electrical insulator waste filler on the properties of glass fiber reinforced epoxy composite. The electrical insulator waste fillers were uniformly mixed in the resin through ultrasonication technique. Composites were made up with different percentages of filler (0, 5, 10, 20 wt%) and 20 wt% glass fiber using the hand lay-up method. Physical, mechanical, water absorption, thermal, and dynamic mechanical properties were studied. The experimental results indicate an increase in water absorption and density of composites with increased electrical insulator waste filler in the polymer matrix. Furthermore, the filler addition reduces the tensile strength and increases the flexural strength to 402 MPa at 20% addition. The thermogravimetric analysis reveals that the incorporation of electrical insulator waste filler increases the thermal stability considerably. Dynamic property reveals the damping property of the materials, in which the incorporation of 20% filler leads to higher storage modulus. Particle dispersion and failure mode were analyzed using scanning electron microscope. This work highlights the possibility for reprocessing electrical insulator waste as low-cost reinforcement in polymer composites.

scholarly journals Broadband Electromagnetic Absorbing Structures Made of Graphene/Glass-Fiber/Epoxy Composite

2020 ◽  
Vol 68 (2) ◽  
pp. 590-601 ◽  
Author(s):  
Fabrizio Marra ◽  
Julian Lecini ◽  
Alessio Tamburrano ◽  
Luigi Pisu ◽  
Maria Sabrina Sarto
Keyword(s):  
Glass Fiber ◽  
Epoxy Composite ◽  
Graphene Glass

Integrated vacuum assisted resin infusion and resin transfer molding technique for manufacturing of nano-filled glass fiber reinforced epoxy composite

2020 ◽  
pp. 152808372093233 ◽  
Author(s):  
MA Agwa ◽  
Sherif M Youssef ◽  
Soliman S Ali-Eldin ◽  
M Megahed
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Surface Finish ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Low Cost ◽  
Resin Transfer Molding ◽  
Polymeric Composite ◽  
Resin Infusion ◽  
Transfer Molding

Vacuum-Assisted Resin Infusion (VARI) and Resin Transfer Molding (RTM) techniques are the most common techniques for the manufacturing of polymeric composite laminates. The VARI technique has a lot of advantages such as low cost, free voids laminates and the ability to produce complex shapes. However, it has some drawbacks such as poor surface finish and temperature instabilities. On the contrary, the RTM technique can withstand high temperature, producing a good surface finish and complex shape laminates. However, it has a high tooling cost and poor quality laminates due to void contents. In this study, a new technique integrated both VARI and RTM techniques is developed to minimize their drawbacks. This technique involves using a semitransparent composite plate instead of a vacuum bag in the VARI technique. This semitransparent plate takes the inverse shape of the composite laminate similar to the RTM tooling. However, this plate has a low cost compared with RTM tooling and allows monitoring of the resin flow during the infusion process. To validate the integrated technique, the mechanical properties of composite laminates are compared with that produced by hand layup technique (HLT). Moreover, the influence of incorporation of 0.25 wt. % and 0.5 wt. % of titanium dioxide (TiO2) nanoparticle into woven and chopped fiber/epoxy composite laminates was demonstrated. The results indicated that the laminates fabricated by the integrated VARI method showed higher mechanical properties than those produced by the hand-layup technique. Moreover, glass fiber/epoxy filled with 0.25 wt. % of TiO2 nanoparticles gives high mechanical properties.

scholarly journals Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

2013 ◽  
Vol 8-9 ◽  
pp. 353-360 ◽  
Author(s):  
Ştefan Ursache ◽  
Romeo Cristian Ciobanu ◽  
Vlad Scarlatache ◽  
Andrei Niagu
Keyword(s):  
Modeling And Simulation ◽  
Electromagnetic Compatibility ◽  
Electromagnetic Properties ◽  
Shielding Effectiveness ◽  
Absorption Mechanism ◽  
Dielectric Characteristics ◽  
Radar Absorbing Material ◽  
Conductive Nanocomposites ◽  
Absorbing Material ◽  
Composite Form

The paper highlights the most important dielectric features for some nanocomposites polymer matrix based on polypropylene (PP) with insertion of carbon nanotubes multi-walled (MWCNTs). The dielectric characteristics analyzed are the real permittivity and dielectric losses of the sample based on PP with 5% insertion of MWCNTs. The measurements are made in a range of frequency between 1 MHz to 3 GHz. The composite form was also analyzed through computer modeling and simulation and electromagnetic properties for EMC shielding applications are also considered. PP/MWCNTs composite with shielding effectiveness of 15-20 dB was investigated through modeling and simulation at about 5% MWCNTs filling. Shielding mechanism was estimated by calculating the total shielding effectiveness (SE) into absorption and reflection loss. PP/MWCNTs composite indicates a shielding mostly by absorption mechanism; therefore it also can be used in other microwave applications or like a radar absorbing material. The effect of MWCNTs affects the electrical conductivity of the nanocomposite. The proposed material shows some interesting electromagnetic compatibility (EMC) properties and promises better performance using different amounts of MWCNTs.

Hydrothermal effects on the burst strength of impacted glass fiber/epoxy composite pipes

2016 ◽  
Vol 58 (4) ◽  
pp. 333-336 ◽  
Author(s):  
Hawa Ahmad ◽  
Mohd. Shukry Abdul Majid ◽  
Mohd. Afendi Rojan ◽  
Fauziah Mat ◽  
Yakubu Dan-Mallam
Keyword(s):  
Glass Fiber ◽  
Epoxy Composite ◽  
Burst Strength ◽  
Composite Pipes

Solution Processed Sb2S3-based Photocathode with Enhanced Photocatalytic Performance via Constructing Ultrathin TiO2 Overlayer and Noble Metal Modification

2021 ◽  
Author(s):  
Yanwen Wang ◽  
Rong Liang ◽  
Chao Qin ◽  
Lei Ren ◽  
Zhizhen Ye ◽  
...  
Keyword(s):  
Visible Light ◽  
Noble Metal ◽  
Photocatalytic Performance ◽  
Low Cost ◽  
Light Response ◽  
Solution Processed ◽  
Antimony Sulfide ◽  
Visible Light Response ◽  
Absorbing Material

Antimony sulfide (Sb2S3) is a light absorbing material with strong visible light response, which is suitable for efficient and low-cost photoelectrodes. Nano-structured films have unique advantages in constructing photoelectrodes due...

scholarly journals Sunflower-Like Nanostructure with Built-In Hotspots for Alpha-Fetoprotein Detection

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1197
Author(s):  
Xiaoyu Zhao ◽  
Aonan Zhu ◽  
Yaxin Wang ◽  
Yongjun Zhang ◽  
Xiaolong Zhang
Keyword(s):  
Rapid Detection ◽  
Clinical Medicine ◽  
Electromagnetic Coupling ◽  
Low Cost ◽  
Surface Enhanced Raman Spectroscopy ◽  
Alpha Fetoprotein ◽  
Low Concentrations ◽  
Surface Enhanced Raman ◽  
Active Substrate ◽  
Array Structures

In the present study, a sunflower-like nanostructure array composed of a series of synaptic nanoparticles and nanospheres was manufactured through an efficient and low-cost colloidal lithography technique. The primary electromagnetic field contribution generated by the synaptic nanoparticles of the surface array structures was also determined by a finite-difference time-domain software to simulate the hotspots. This structure exhibited high repeatability and excellent sensitivity; hence, it was used as a surface-enhanced Raman spectroscopy (SERS) active substrate to achieve a rapid detection of ultra-low concentrations of Alpha-fetoprotein (AFP). This study demonstrates the design of a plasmonic structure with strong electromagnetic coupling, which can be used for the rapid detection of AFP concentration in clinical medicine.

scholarly journals Transport Properties of Natural and Artificial Smart Fabrics Impregnated by Graphite Nanomaterial Stacks

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1018
Author(s):  
Carola Esposito Corcione ◽  
Francesca Ferrari ◽  
Raffaella Striani ◽  
Antonio Greco
Keyword(s):  
Electrical Conductivity ◽  
Transport Properties ◽  
Low Cost ◽  
Empirical Relationship ◽  
Theoretical Models ◽  
Expandable Graphite ◽  
Easy Method ◽  
Textile Materials ◽  
Fabric Materials ◽  
The Impact

In this work, we studied the transport properties (thermal and electrical conductivity) of smart fabric materials treated with graphite nanomaterial stacks–acetone suspensions. An innovative and easy method to produce graphite nanomaterial stacks–acetone-based formulations, starting from a low-cost expandable graphite, is proposed. An original, economical, fast, and easy method to increase the thermal and electrical conductivity of textile materials was also employed for the first time. The proposed method allows the impregnation of smart fabric materials, avoiding pre-coating of the fibers, thus reducing costs and processing time, while obtaining a great increase in the transport properties. Two kinds of textiles, cotton and Lycra®, were selected as they represent the most used natural and artificial fabrics, respectively. The impact of the dimensions of the produced graphite nanomaterial stacks–acetone-based suspensions on both the uniformity of the treatment and the transport properties of the selected textile materials was accurately evaluated using several experimental techniques. An empirical relationship between the two transport properties was also successfully identified. Finally, several theoretical models were applied to predict the transport properties of the developed smart fabric materials, evidencing a good agreement with the experimental data.

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