scholarly journals Mace-like carbon fibers/ZnO nanorods composites derived from Typha orientalis as ultralight and high-performance electromagnetic wave absorber

2021 ◽  
Author(s):  
Yanyan Dong ◽  
Xiaojie Zhu ◽  
Fei Pan ◽  
Baiwen Deng ◽  
Zhicheng Liu ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Low Cost ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Hollow Structure ◽  
Filling Ratio ◽  
Impedance Match ◽  
Typha Orientalis

Abstract Inspired by the nature, biomass-derived carbon attracts many attentions as the electromagnetic wave absorption (EMA) material owing to its advantages including abundant, low cost, renewable and environmentally friendly. However, it is difficult to make further breakthrough in effective absorption bandwidth (EAB) due to the impedance mismatch. In this work, mace-like carbon fibers/ZnO nanorods composites (BDCFs@ZnO) derived from Typha orientalis were prepared via a carbonization process and a subsequent hydrothermal process for the first time. The unique hollow structure of BDCFs and the construction of 3D interconnected conductive network led to the strong conduction loss and multiple reflection. The BDCFs sample possesses an excellent EMA performance with an ultralow filling ratio of only 5wt%. After directionally growing of the ZnO nanorods, an exceptional RL of -62.35 dB at 14.12 GHz and the EAB achieves 6.8 GHz at the thickness of 2.29 mm at a filling ratio of 15wt% were revealed. Mace-like ZnO with suitable permittivity effectively avoid the reflection result from direct contraction between EMW and carbon fiber, further improving impedance match. Simultaneously, a dielectric sum-quotient model was proposed to analyze the EMA performance of the samples. This work not only offers an inspiration for the development of dielectric loss-type EMA materials with lightweight and strong EMA performance by a sustainable, low-cost and easily available approach, but also provides an important strategy toward biomass-derived carbon-fiber-based composites in other fields.

Electromagnetic Wave Shieding Effectiveness of Carbon Fiber Sheet Coated Ferrite Film by Microwave-Hydrothermal Process

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1235-1241 ◽  
Author(s):  
Ri Ichi Murakami ◽  
Hidetoshi Yamamoto ◽  
Chan Kong Kim ◽  
Cheol Mun Yim ◽  
Yun Hae Kim
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Wireless Lan ◽  
Hydrothermal Process ◽  
Ferrite Film ◽  
Shielding Effectiveness ◽  
Microwave Hydrothermal ◽  
Fiber Sheet ◽  
Coated Carbon ◽  
Carbon Fiber Sheet

The developments of electromagnetic wave shielding materials are strongly required because the malfunction of electronic equipment, mobile phone and wireless LAN avoids. In this study, it was investigated that the electromagnetic shielding effectiveness of carbon fiber sheets were enhanced by the ferrite which was coated by the microwave hydrothermal process. For coated carbon fiber sheet, the effects of ferrite and lamination of carbon fiber textile on the electromagnetic wave shielding effectiveness were discussed. In the range of frequency (100 – 1 GHz), the electromagnetic wave shielding effectiveness was measured by using TEM-Cell. The electromagnetic wave shielding effectiveness was greater for the coated carbon fiber sheets than for the uncoated carbon fiber sheets. When the insulation film was located between two carbon fiber sheets, the electromagnetic wave shielding effectiveness increased.

scholarly journals A promising carbon fiber-based photocatalyst with hierarchical structure for dye degradation

RSC Advances ◽  
2017 ◽  
Vol 7 (36) ◽  
pp. 22234-22242 ◽  
Author(s):  
Chen Gu ◽  
Sen Xiong ◽  
Zhaoxiang Zhong ◽  
Yong Wang ◽  
Weihong Xing
Keyword(s):  
Carbon Fiber ◽  
Atomic Layer Deposition ◽  
Magnetron Sputtering ◽  
Carbon Fibers ◽  
Dye Degradation ◽  
Zno Nanorods ◽  
Pt Nanoparticles ◽  
Atomic Layer ◽  
Dc Magnetron Sputtering ◽  
Layer Deposition

To fabricate a novel photocatalyst, ZnO seeds were uniformly deposited on carbon fibers via atomic layer deposition followed by hydrothermal growth of ZnO nanorods, then Pt nanoparticles were deposited by DC magnetron sputtering.

Incorporation of Sb in ZnO Nanostructures Through Hydrothermal Process

2008 ◽  
Vol 8 (12) ◽  
pp. 6551-6557 ◽  
Author(s):  
A. Escobedo Morales ◽  
U. Pal ◽  
M. Herrera Zaldivar
Keyword(s):  
Optical Band Gap ◽  
Catalytic Effect ◽  
Low Cost ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Semiconductor Nanostructures ◽  
Zno Nanostructures ◽  
High Concentration ◽  
Heavy Doping ◽  
Chemical Techniques

Incorporation of dopants in optoelectronic semiconductor nanostructures has been a matter of great interest in recent times. While such doping has been performed almost routinely using physical methods, use of low-cost chemical techniques for that purpose is still rare. We incorporated antimony in zinc oxide (ZnO) nanostructures through a low temperature hydrothermal method. In as-grown nanostructures, antimony remains partially in Sb2O3 phase. On thermal annealing at 500 °C, it dissociates and antimony incorporates into ZnO mainly by substituting zinc from the crystal lattice. Incorporation of Sb drastically modifies the morphology of the ZnO nanostructures. While incorporation of Sb in low concentration promotes the formation of uniform prismatic ZnO nanorods probably due to catalytic effect, high concentration of Sb causes the formation of rounded shaped nanoparticles due to high interfacial compressive stress. Incorporated Sb in the ZnO nanostructures remains inhomogeneously distributed. The optical band gap of the ZnO nanostructures increases a bit for lightly doped samples but it decreases for heavy doping.

scholarly journals A Low Cost Carbon Nanofiber Based Spiral Inductor: Inference and Implementation

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
John Wiselin ◽  
Sreeja Balakrishnapillai Suseela ◽  
Bycil Viswambaran Jalaja ◽  
Sherin Dhas Sahayadas Padma Ramani ◽  
Rajesh Prasad ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Quality Factor ◽  
Carbon Fibers ◽  
Carbon Nanofiber ◽  
Low Cost ◽  
Simulation Software ◽  
Spiral Inductor ◽  
Hardware Implementations

This paper investigates the possibilities of using carbon fiber as an inductor material by analyzing its inductive properties. Various shapes such as rectangular, spiral, helical, and cylindrical line structures have been simulated under various constraints using simulation software. Hardware implementations were also tested and both simulation and hardware results show that carbon fibers have the potential to replace copper inductor lines. The implemented spiral inductor produced a quality factor of 40 while producing an inductance of 4 nH at 1.2 GHz frequency.

Preparation of polyacrylonitrile–natural polymer composite precursors for carbon fiber using ionic liquid co solvent solutions

2014 ◽  
Vol 2 (10) ◽  
pp. 3424-3429 ◽  
Author(s):  
Nolene Byrne ◽  
Alexis Leblais ◽  
Bronwyn Fox
Keyword(s):  
Ionic Liquid ◽  
Carbon Fiber ◽  
Polymer Composite ◽  
Carbon Fibers ◽  
Low Cost ◽  
Environmentally Friendly ◽  
Natural Polymer

We report on the use of ionic liquid co-solvents in the preparation of polyacrylonitrile–natural polymer carbon fibers as low cost environmentally friendly alternatives to conventional carbon fibers precursors and processing solvents.

Synthesis and Characterization of the Sizing Agents on the Carbon Fibers

2011 ◽  
Vol 233-235 ◽  
pp. 70-73
Author(s):  
Hong Bo Zhang ◽  
Chun Hui Su ◽  
Xiao Wei Zhu
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Low Cost ◽  
Process Condition ◽  
Decomposition Temperature ◽  
Synthesis Process ◽  
Optimum Process ◽  
Octyl Phenol ◽  
Sizing Agents

The recent development of carbon fiber sizing agent was introduced in this article. The sizing agent used in carbon fiber was synthesized at a temperature range of 55-60°C using epoxy resin and vinyl acetate as a monomer together, octyl phenol ethoxylated(OP-10) as the emulsion agent, ammonium peroxydisulfate as the solicitation agent and water as the dispersant. At the same time, the optimum composition, the optimum process condition and the effects affecting the emulsion stability were discussed. The characterizations were measured by Scanning Electron Microscopy and TG. The results show that the synthesis process is simple, low cost, less polution and remarkbably stable. The diameter of the particle is 1.8μm and the decomposition temperature is 260°C.

scholarly journals ZnO Nano-Flowers Assembled on Carbon Fiber Textile for High-Performance Supercapacitor’s Electrode

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1337
Author(s):  
Qasim Abbas ◽  
Muhammad Sufyan Javed ◽  
Awais Ahmad ◽  
Sajid Hussain Siyal ◽  
Idress Asim ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
High Performance ◽  
Electrode Materials ◽  
Low Cost ◽  
Hydrothermal Process ◽  
Effective Surface Area ◽  
Effective Surface ◽  
Efficient Diffusion ◽  
Binder Free ◽  
Simple Hydrothermal Process

Herein, a crystalline nano-flowers structured zinc oxide (ZnO) was directly grown on carbon fiber textile (CFT) substrate via a simple hydrothermal process and fabricated with a binder-free electrode (denoted as ZnO@CFT) for supercapacitor (SC) utilization. The ZnO@CFT electrode revealed a 201 F·g−1 specific capacitance at 1 A·g−1 with admirable stability of >90% maintained after 3000 cycles at 10 A·g−1. These impressive findings are responsible for the exceedingly open channels for well-organized and efficient diffusion of effective electrolytic conduction via ZnO and CFT. Consequently, accurate and consistent structural and morphological manufacturing engineering is well regarded when increasing electrode materials’ effective surface area and intrinsic electrical conduction capability. The crystalline structure of ZnO nano-flowers could pave the way for low-cost supercapacitors.

scholarly journals Fabrication of Novel 2D NiO Nanosheet Branched on 1D-ZnO Nanorod Arrays for Gas Sensor Application

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Le Thuy Hoa ◽  
Huynh Ngoc Tien ◽  
Seung Hyun Hur
Keyword(s):  
Carrier Transport ◽  
Gas Adsorption ◽  
Low Cost ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Large Area ◽  
Highly Sensitive ◽  
P Type ◽  
Reducing Gases ◽  
Nio Nanosheets

Fabrication of 3D structures composed of 1D n-type ZnO nanorods (NRs) and 2D p-type NiO nanosheets (NSs) by a low-cost, low-temperature, and large-area scalable hydrothermal process and its use in highly sensitive NO2gas sensors were studied. The p-n heterojunctions formed by NiO-ZnO interfaces as well as large area two-dimensional NiO NSs themselves increased the adsorption of NO2. Moreover, the charge transfer between NiO and ZnO enhanced the responsivity and sensitivity of NO2sensing even at a concentration of 1 ppm. The 30-min NiO NS growth on ZnO NRs in the hybrid sensor showed the highest sensitivity due to the formation of optimum p-n heterojunctions between ZnO NRs and NiO NSs for gas adsorption and carrier transport. Low responsivity toward reducing gases was also observed.

scholarly journals Design of Low Cost Carbon Fiber Composites via Examining the Micromechanical Stress Distributions in A42 Bean-Shaped versus T650 Circular Fibers

2021 ◽  
Vol 5 (11) ◽  
pp. 294
Author(s):  
Imad Hanhan ◽  
Michael D. Sangid
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Composite ◽  
Low Cost ◽  
Complex Loading ◽  
Fiber Composites ◽  
Production Costs ◽  
Carbon Fiber Composites ◽  
Stress Distributions ◽  
Carbon Fiber Composite

Recent advancements have led to new polyacrylonitrile carbon fiber precursors which reduce production costs, yet lead to bean-shaped cross-sections. While these bean-shaped fibers have comparable stiffness and ultimate strength values to typical carbon fibers, their unique morphology results in varying in-plane orientations and different microstructural stress distributions under loading, which are not well understood and can limit failure strength under complex loading scenarios. Therefore, this work used finite element simulations to compare longitudinal stress distributions in A42 (bean-shaped) and T650 (circular) carbon fiber composite microstructures. Specifically, a microscopy image of an A42/P6300 microstructure was processed to instantiate a 3D model, while a Monte Carlo approach (which accounts for size and in-plane orientation distributions) was used to create statistically equivalent A42/P6300 and T650/P6300 microstructures. First, the results showed that the measured in-plane orientations of the A42 carbon fibers for the analyzed specimen had an orderly distribution with peaks at |ϕ|=0∘,180∘. Additionally, the results showed that under 1.5% elongation, the A42/P6300 microstructure reached simulated failure at approximately 2108 MPa, while the T650/P6300 microstructure did not reach failure. A single fiber model showed that this was due to the curvature of A42 fibers which was 3.18 μm−1 higher at the inner corner, yielding a matrix stress that was 7 MPa higher compared to the T650/P6300 microstructure. Overall, this analysis is valuable to engineers designing new components using lower cost carbon fiber composites, based on the micromechanical stress distributions and unique packing abilities resulting from the A42 fiber morphologies.

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