Well-matched impedance of polypyrrole-loaded cotton non-woven fabric/polydimethylsiloxane composite for extraordinary microwave absorption

2020 ◽  
Vol 197 ◽  
pp. 108246 ◽  
Author(s):  
Yiyuan Shi ◽  
Lujun Yu ◽  
Kan Li ◽  
Shengze Li ◽  
Yubing Dong ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Woven Fabric ◽  
Matched Impedance

scholarly journals A Facile Synthesis of Novel Amorphous TiO2 Nanorods Decorated rGO Hybrid Composites with Wide Band Microwave Absorption

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2141
Author(s):  
Hao Zhang ◽  
Yongpeng Zhao ◽  
Xuan Yang ◽  
Guolin Zhao ◽  
Dongmei Zhang ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Hybrid Composites ◽  
Precursor Solution ◽  
Wide Band ◽  
Facile Synthesis ◽  
Highly Efficient ◽  
Amorphous Structures ◽  
One Step ◽  
Amorphous Tio2 ◽  
Matched Impedance

Amorphous structures may play important roles in achieving highly efficient microwave absorption performance due to the polarization losses induced by the disorders, vacancies and other functional groups existed in them. Herein, a kind of amorphous TiO2/rGO composite (a-TiO2/rGO) was successfully fabricated via a facile one-step solvothermal method. The complex permittivity of the composites can be regulated by adjusting the addition of precursor solution. The minimum reflection loss of a-TiO2/rGO composites reached −42.8 dB at 8.72 GHz with a thickness of 3.25 mm, and the widest efficient absorption bandwidth (EAB) was up to 6.2 GHz (11.8 to 18 GHz) with a thickness of only 2.15 mm, which achieved the full absorption in Ku band (12 to 18 GHz). Furthermore, the EAB was achieved ranging from 3.97 to 18 GHz by adjusting the thickness of the absorber, covering 87.7% of the whole radar frequency band. It is considered that the well-matched impedance, various polarization processes, capacitor-like structure and conductive networks all contributed to the excellent microwave absorption of a-TiO2/rGO. This study provides reference on constructing amorphous structures for future microwave absorber researches and the as-prepared a-TiO2/rGO composites also have great potential owing to its facile synthesis and highly efficient microwave absorption.

scholarly journals An Easy Method of Synthesis CoxOy@C Composite with Enhanced Microwave Absorption Performance

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 902
Author(s):  
Wenli Bao ◽  
Cong Chen ◽  
Zhenjun Si
Keyword(s):  
Microwave Absorption ◽  
Impedance Matching ◽  
Interfacial Polarization ◽  
Magnetic Composite ◽  
Easy Method ◽  
Electromagnetic Absorption ◽  
Absorption Performance ◽  
Matched Impedance ◽  
Microwave Absorption Performance ◽  
Minimum Reflection Loss

Design of interface-controllable magnetic composite towards the wideband microwave absorber is greatly significance, however, it still remains challenging. Herein, we designed a spherical-like hybrids, using the Co3O4 and amorphous carbon as the core and shell, respectively. Then, the existed Co3O4 core could be totally reduced by the carbon shell, thus in CoxOy core (composed by Co and Co3O4). Of particular note, the ratios of Co and Co3O4 can be linearly tuned, suggesting the controlled interfaces, which greatly influences the interface loss behavior and electromagnetic absorption performance. The results revealed that the minimum reflection loss value (RLmin) of −39.4 dB could be achieved for the optimal CoxOy@C sample under a thin thickness of 1.4 mm. More importantly, the frequency region with RL < −10 dB was estimated to be 4.3 GHz, ranging from 13.7 to 18.0 GHz. The superior wideband microwave absorption performance was primarily attributed to the multiple interfacial polarization and matched impedance matching ability.

Synergistic engineering of dielectric and magnetic losses in M-Co/RGO nanocomposites for use in high-performance microwave absorption

2020 ◽  
Vol 4 (10) ◽  
pp. 3013-3021
Author(s):  
Qi Li ◽  
Zheng Zhang ◽  
Xiaochen Xun ◽  
Fangfang Gao ◽  
Xuan Zhao ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Impedance Matching ◽  
Magnetic Losses ◽  
Attenuation Constant ◽  
High Attenuation ◽  
Matched Impedance

M-Co/RGO nanocomposites with well-matched impedance matching and high attenuation constant are developed and enhanced microwave absorption was obtained through the strategy of synergistic engineering of dielectric and magnetic losses.

Mikania micrantha mixed woven fabric for quick blood clotting and wound healing

2020 ◽  
Vol 6 (5) ◽  
Author(s):  
Shaikh Md Mominul Alam ◽  
Shilpi Akter ◽  
Md Lutfor Rahman
Keyword(s):  
Wound Healing ◽  
Blood Clotting ◽  
Woven Fabric ◽  
Excessive Bleeding ◽  
Sustainable Operations ◽  
Environment Friendly ◽  
Mikania Micrantha ◽  
Leaf Powder ◽  
Medical Textile ◽  
Dressing Materials

The aim of this paper is to introduce novel dressing with Mikania Micrantha for quick blood clotting and wound healing. When epidermis of human skin is cut or scrapped, sometimes too much bleeding occurs. Excessive bleeding may cause death, if bleeding is not stopped immediately. To promote blood clotting & wound healing natural based bio materials are still insufficient in medical textile sector. To fill up this scarcity, woven fabric treated with Mikania micrantha leaf juice & leaf powder was examined. M. micrantha exhibits good blood clotting time in comparison with available dressing materials. Woven fabric (bandage) that contains M. micrantha can be used for cut wounds healing purpose. The experiments were carried out in environment friendly way which indicates the production & processing of these dressing materials can have enormous contribution to sustainable operations and products.

Microwave wide band absorption by carbon from Corn cob-1

2016 ◽  
Vol 12 (2) ◽  
pp. 4204-4212 ◽  
Author(s):  
Maheshwar Sharon ◽  
Ritesh Vishwakarma ◽  
Abhijeet Rajendra Phatak ◽  
Golap Kalita ◽  
Nallin Sharma ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Agricultural Waste ◽  
Wide Band ◽  
Nickel Nitrate ◽  
Equivalent Amount ◽  
Frequency Range ◽  
Corn Cob ◽  
Different Temperatures ◽  
Band Absorption ◽  
5 Ghz

Corn cob, an agricultural waste, is paralyzed at different temperatures (700oC, 800oC and 900oC). Microwave absorption of carbon in the frequency range of 2 GHz to 8 GHz is reported. Carbon activated  with 5%  nickel nitrate showed more than 90% absorption of microwave in the frequency range from 6 GHz to 8 GHz, while carbon activated  with 10% Nickel nitrate treated corn cob showed 90% absorption  in the frequency range of 2.5 GHz to 5 GHz. Carbon showing the best absorption are characterized by XRD, Raman spectra and SEM . It is suggested that corn cob treatment   alone with KOH did not improve the microwave absorption, whereas treatment along with nickel nitrate improved the absorption property much better. It is proposed that treatment with nickel nitrate helps in creating suitable pores in carbon   which improved the absorption behavior because while treating carbon with 1N HCl helps to leach out nickel creating equivalent amount of pores in the carbon.

Effect of Shape of Fiber Bundle on Damage Development of Woven Fabric Composities

2006 ◽  
Vol 55 (2) ◽  
pp. 224-229 ◽  
Author(s):  
Takao OTA ◽  
Hikaru YOSHIZUMI ◽  
Hirokazu TSUCHIHASHI ◽  
Takashi MATSUOKA ◽  
Kazuhiko SAKAGUCHI
Keyword(s):  
Fiber Bundle ◽  
Woven Fabric ◽  
Damage Development
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