scholarly journals Wideband Radar Absorbing Structure Using Polyaniline-Graphene Nanocomposite

2020 ◽  
Vol 6 (4) ◽  
pp. 72
Author(s):  
Paulbert Thomas ◽  
Libimol V. Abdulhakim ◽  
Neeraj K. Pushkaran ◽  
Aanandan C. Karuvandi
Keyword(s):  
Golden Ratio ◽  
Functional Materials ◽  
Target Object ◽  
Design Parameters ◽  
Graphene Nanocomposites ◽  
Radar Absorbing Material ◽  
Graphene Nanocomposite ◽  
Wideband Radar ◽  
Conducting Polymer Composites ◽  
Radar Absorbing Structure

A wideband non-resonant absorber is proposed, and its radar cross section (RCS) reduction is investigated. A discussion on the functional materials available is followed by the design of an absorber on a Plexiglas substrate with polyaniline-graphene nanocomposite as layered square inclusions with thicknesses and conductivities scaled to golden ratio. The measured dielectric properties of polyaniline-graphene nanocomposites are used in the fullwave simulation. The design parameters have been identified and optimized using CST Microwave Studio. As designed structure is fabricated and the reflection is measured. The objective of the work is to demonstrate the use of non-metallic conducting polymer composites devoid of metals for radar absorbing material (RAM) structural designs. The structure is an all-polymer and electrically thin design with a potential to be 3D printed to suit the target object.

Technical viewpoint on polystyrene/graphene nanocomposite

2020 ◽  
pp. 089270572090765
Author(s):  
Ayesha Kausar
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
State Of The Art ◽  
Synthetic Methods ◽  
Structure Property ◽  
Electromagnetic Interference Shielding ◽  
Graphene Nanocomposites ◽  
Structure Property Relationship ◽  
Fundamental Understanding ◽  
Graphene Nanocomposite

This review presents state-of-the-art progress in the field of polystyrene (PS)/graphene nanocomposite. Graphene is a monoatomic thick nanoallotrope of carbon. It has attracted tremendous research consideration owing to chemical functionalization aptitude and remarkable physical properties. Graphene has been used as a potential nanofiller to dramatically improve the performance of polymeric nanocomposite. PS is an important synthetic aromatic thermoplastic polymer. Graphene has been used to enhance the mechanical strength, thermal stability, electrical conductivity, and thermal conductivity of PS/graphene nanocomposite. Dispersion routes and synthetic methods of graphene and PS/graphene nanocomposite have also been reviewed. PS/graphene nanocomposites have been explored for anticorrosion, electromagnetic interference shielding, batteries, electrocatalysis, and microextraction applications. In spite of interesting developments, a lot remains to be done with regard to fundamental understanding of structure–property relationship and designing materials to operate for advanced high performance applications. This review is also concluded listing current challenges associated with processing and future perspectives of nanocomposite.

scholarly journals CuInSe2 nanotube arrays for efficient solar energy conversion

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Wipula Priya Rasika Liyanage ◽  
Manashi Nath
Keyword(s):  
Thin Film ◽  
Structural Parameters ◽  
Light Trapping ◽  
Functional Materials ◽  
Design Parameters ◽  
Nanotube Arrays ◽  
Photoconversion Efficiency ◽  
Liquid Junction ◽  
Versatile Technique ◽  
Electrode Coverage

AbstractHighly uniform and vertically aligned p-type CuInSe2 (CISe) nanotube arrays were fabricated through a unique protocol, incorporating confined electrodeposition on lithographically patterned nanoelectrodes. This protocol can be readily adapted to fabricate nanotube arrays of other photoabsorber and functional materials with precisely controllable design parameters. Ternary CISe nanotube arrays were electrodeposited congruently from a single electrolytic bath and the resulting nanotube arrays were studied through powder X-ray diffraction as well as elemental analysis which revealed compositional purity. Detailed photoelectrochemical (PEC) characterizations in a liquid junction cell were also carried out to investigate the photoconversion efficiency. It was observed that the tubular geometry had a strong influence on the photocurrent response and a 29.9% improvement of the photoconversion efficiency was observed with the nanotube array compared to a thin film geometry fabricated by the same process. More interestingly such enhancement in photoconversion efficiency was obtained when the electrode coverage with the nanotube arrays as photoactive material was only a fraction (~10%) of that for the thin film device. Apart from enhancement in photoconversion efficiency, this versatile technique provides ample opportunities to study novel photovoltaic materials and device design architectures where structural parameters play a key role such as resonant light trapping.

Ultrafast lithium storage in TiO2–bronze nanowires/N-doped graphene nanocomposites

2015 ◽  
Vol 3 (8) ◽  
pp. 4180-4187 ◽  
Author(s):  
Xiao Yan ◽  
Yanjuan Li ◽  
Malin Li ◽  
Yongcheng Jin ◽  
Fei Du ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
High Power ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Lithium Storage ◽  
Graphene Nanocomposites ◽  
High Reversible Capacity ◽  
Doped Graphene ◽  
Rate Capacity ◽  
Graphene Nanocomposite

A TiO2–bronze/N-doped graphene nanocomposite was prepared by a facile method. The material exhibits outstanding rate capacity. A high reversible capacity of 101.6 mA h g−1 is obtained at the 100C rate, indicating its great potential for use in high power lithium ion batteries.

In situ grown cobalt selenide/graphene nanocomposite counter electrodes for enhanced dye-sensitized solar cell performance

2017 ◽  
Vol 5 (28) ◽  
pp. 14583-14594 ◽  
Author(s):  
Vignesh Murugadoss ◽  
Ning Wang ◽  
Sruthi Tadakamalla ◽  
Bin Wang ◽  
Zhanhu Guo ◽  
...  
Keyword(s):  
Reaction Kinetic ◽  
Power Conversion ◽  
Counter Electrodes ◽  
Kinetic Rate ◽  
Solar Cell Performance ◽  
Graphene Nanocomposites ◽  
Dye Sensitized ◽  
Graphene Nanocomposite ◽  
Cobalt Selenide

In situ hydrothermally grown hybrid CoSe/graphene nanocomposites exhibited a higher reaction kinetic rate for tri-iodide reduction and 20% improvement in power conversion efficiency than the Pt counter electrode.

Synthesis, characterization and cytotoxicity of europium incorporated ZnO–graphene nanocomposites on human MCF7 breast cancer cells

RSC Advances ◽  
2014 ◽  
Vol 4 (71) ◽  
pp. 37479-37490 ◽  
Author(s):  
Susanta Bera ◽  
Monisankar Ghosh ◽  
Moumita Pal ◽  
Nilanjana Das ◽  
Suchandrima Saha ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Cancer Cells ◽  
Breast Cancer Cells ◽  
Laser Scanning ◽  
Confocal Laser Scanning Microscope ◽  
Confocal Laser ◽  
Human Breast ◽  
Scanning Microscope ◽  
Graphene Nanocomposites ◽  
Graphene Nanocomposite

Eu incorporated ZnO–graphene nanocomposite in human breast cancer cells (MCF7) under a confocal laser scanning microscope.

scholarly journals Rapid self-healing and recycling of multiple-responsive mechanically enhanced epoxy resin/graphene nanocomposites

RSC Advances ◽  
2017 ◽  
Vol 7 (73) ◽  
pp. 46336-46343 ◽  
Author(s):  
Chenting Cai ◽  
Yue Zhang ◽  
Xueting Zou ◽  
Rongchun Zhang ◽  
Xiaoliang Wang ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
High Performance ◽  
Diels Alder ◽  
Self Healing ◽  
Covalent Bonds ◽  
Graphene Nanocomposites ◽  
Graphene Nanocomposite

A rapid self-healing and recyclable high-performance crosslinked epoxy resin (ER)/graphene nanocomposite is reported by simultaneously incorporating thermally reversible Diels–Alder (DA) covalent bonds and multiple-responsive graphene into the ER matrix.

scholarly journals Multiple-responsive shape memory polyacrylonitrile/graphene nanocomposites with rapid self-healing and recycling properties

RSC Advances ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 1225-1231 ◽  
Author(s):  
Chenting Cai ◽  
Yue Zhang ◽  
Mei Li ◽  
Yan Chen ◽  
Rongchun Zhang ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Shape Memory ◽  
Covalent Bond ◽  
Diels Alder ◽  
Self Healing ◽  
Graphene Nanocomposites ◽  
Graphene Nanocomposite

A Diels–Alder covalent bond based crosslinked polyacrylonitrile/graphene nanocomposite is reported, which has the multiple-responsive properties of shape memory, self-healing, and reprocessing in addition to enhanced mechanical property.

scholarly journals Effective Elimination of Contaminant Antibiotics Using High-Surface-Area Magnetic-Functionalized Graphene Nanocomposites Developed from Plastic Waste

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1517 ◽  
Author(s):  
Noha A. Elessawy ◽  
M. H. Gouda ◽  
Safaa M. Ali ◽  
M. Salerno ◽  
M. S. Mohy Eldin
Keyword(s):  
Adsorption Process ◽  
High Surface ◽  
High Surface Area ◽  
Functional Materials ◽  
Raw Material ◽  
Resistant Bacteria ◽  
Antibiotic Resistant ◽  
Graphene Nanocomposites ◽  
Sulfonated Graphene ◽  
Living Organisms

The presence of pharmaceutical residues in aquatic environments represents a risk for the equilibrium of the ecosystem and may seriously affect human safety itself in the long term. To address this issue, we have synthesized functional materials based on highly-reduced graphene oxide (HRGO), sulfonated graphene (SG), and magnetic sulfonated graphene (MSG). The method of synthesis adopted is simple and inexpensive and makes use of plastic bottle waste as the raw material. We have tested the fabricated materials for their adsorption efficiency against two model antibiotics in aqueous solutions, namely Garamycin and Ampicillin. Our tests involved the optimization of different experimental parameters of the adsorption process, such as starting antibiotic concentration, amount of adsorbent, and time. Finally, we characterized the effect of the antibiotic adsorption process on common living organisms, namely Escherichia coli DH5α (E. coli DH5α) bacteria. The results obtained demonstrate the efficiency of the method in addressing the issue of the emergence of antibiotic-resistant bacteria, which will help in preventing changes in the ecosystem.

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