Nanostructured materials for microwave receptors

Majdzadeh‐Ardakani, Kazem; Holl, Mark M. Banaszak

doi:10.1016/j.pmatsci.2017.02.005

Cited by 53 publications

(21 citation statements)

References 192 publications

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“…Under an alternating electronic field, hopping electrons move in nanofibers. The accumulation of positive and negative charges at the interface of a heterogeneous structure will cause a change in charge density and produce electric dipole moment, which leads to interfacial polarization and associated relaxation, giving rise to dielectric loss. ,− Therefore, it is reasonable to suppose that the peaks in ε″ curves result from interfacial polarization and defect dipole orientation polarization. In addition, the sizes of SiC and Si 3 N 4 nanocrystals are about several tens of nanometers.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The schematic illustration of EM wave loss mechanism of the composite nanofibers is shown in Figure . The synergistic effects among graphite, SiC, and Si 3 N 4 , and interfacial polarization and defect dipole orientation polarization in graphite and SiC contribute to the improvement of the EM wave absorption performance of nanofibers. ,,− Alternatively, one-dimensional EM wave absorbers added in paraffin composites, owing to their high aspect ratio, and the composite nanofibers can easily create a conductive network in paraffin matrix. Under an external electric field, hopping electrons can jump across the interface among nanofibers, and this kind of hopping electrons could enhance microcurrent in the nanofiber network.…”

Section: Results and Discussionmentioning

confidence: 99%

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Flexible SiC/Si₃N₄ Composite Nanofibers with in Situ Embedded Graphite for Highly Efficient Electromagnetic Wave Absorption

Wang

Cheng

Zhang

et al. 2017

ACS Appl. Mater. Interfaces

148

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SiC/SiN composite nanofibers with in situ embedded graphite, which show highly efficient electromagnetic (EM) wave absorption performance in gigahertz frequency, were prepared by electrospinning with subsequent polymer pyrolysis and annealing. By means of incorporating graphite and SiN into SiC, the EM wave absorption properties of the nanofibers were improved. The relationship among processing, fiber microstructure, and their superior EM wave absorption performance was systematically investigated. The EM wave absorption capability and effective absorption bandwidth (EAB) of nanofibers can be simply controlled by adjusting annealing atmosphere and temperature. The nanofibers after annealing at 1300 °C in Ar present a minimum reflection loss (RL) of -57.8 dB at 14.6 with 5.5 GHz EAB. The nanofibers annealed in N at 1300 °C exhibit a minimum RL value of -32.3 dB at a thickness of 2.5 mm, and the EAB reaches 6.4 GHz over the range of 11.3-17.7 GHz. The highly efficient EM wave absorption performance of nanofibers are closely related to dielectric loss, which originated from interfacial polarization and dipole polarization. The excellent absorbing performance together with wider EAB endows the composite nanofibers potential to be used as reinforcements in polymers and ceramics (SiC, SiN, SiO, AlO, etc.) to improve their EM wave absorption performance.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Flexible SiC/Si₃N₄ Composite Nanofibers with in Situ Embedded Graphite for Highly Efficient Electromagnetic Wave Absorption

Wang

Cheng

Zhang

et al. 2017

ACS Appl. Mater. Interfaces

148

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“…In late years, microwave‐assisted synthesis and microwave‐assisted catalytic decomposition have attracted attention as innovative green technologies . Recently, we have developed a new C−M composite powder, Ni metal@multilayered graphene as the main component, synthesized from CH 4 via multimode microwave‐assisted catalytic decomposition .…”

Section: Figurementioning

confidence: 99%

Electrochemical Detection of Free Chlorine Using Ni Metal Nanoparticles Combined with Multilayered Graphene Nanoshells

et al. 2019

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An electrochemical detection of free chlorine using carbon‐metal (C−M) composite powder, with a nickel‐metal nanoparticle combined with a multilayered graphene nanoshell (Ni metal@multilayered graphene) as the main component, synthesized from CH4 via multimode microwave‐assisted catalytic decomposition, was studied. Morphological analysis of the C−M composite powder was performed by TEM–EDX and Raman spectroscopy. The C−M composite powder was packed in a porous microelectrode (PME), and its electrochemical activity with respect to free chlorine was evaluated using a potential sweep method. The C−M composite powder exhibited a sufficient activity against free chlorine. A current based on the reduction of free chlorine was observed in the potential < around+0.3 V vs. Ag/AgCl. A linear relationship was observed between the current and the concentration.

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“…Different from conventional electric heating, microwave heating is selective heating for different components in shale due to their different dielectric properties. Pyrite and clay minerals, for example, are heated much faster in microwave irradiation than other components, which induces thermal stresses and facilitates the generation of new fractures. , In addition, after hydraulic fracturing of shale reservoirs, abundant retention of fracturing fluid inside the shale formations keeps the hydrocarbons from flowing out of the reservoirs. , The rapid evaporation of fracturing fluid during microwave irradiation leads to mechanical stresses, which further promotes the formation of new cracks. Therefore, microwave irradiation stimulation can not only accelerate the backflow efficiency of fracturing fluid but also rapidly improve the pore-water pressure …”

Section: Introductionmentioning

confidence: 99%

Investigation of Microwave Irradiation Stimulation to Enhance the Pore Connectivity of Shale

et al. 2021

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Microwave irradiation stimulation is proposed as a new approach to improve shale oil and gas recovery. Since shale oil and gas recovery is controlled by pore connectivity, this work investigated the effects of microwave irradiation on the pore connectivity of shales with different maturities. In this study, we first characterized the initial pore connectivity of shale samples by the combination of (ultra) small-angle neutron scattering and mercury injection capillary pressure. Then, (ultra) small-angle neutron scattering results were used to compare the pore size distribution of shale samples under different microwave treatment times. The experiment results show that microwave treatment can reduce fine pore networks (<10 nm) and form large pore-fracture systems (>10 nm) for shale oil samples. In addition, the number density of pores for shale gas samples exhibited a decreasing trend with the time of the microwave treatment, indicating that many pores expanded and connected. Therefore, microwave irradiation stimulation can improve the pore connectivity and create new flow paths for oil and gas from the shale matrix to the fracture system. Meanwhile, the high content of pyrite and clay will enhance the microwave adsorption ability of shale. This study establishes the environmentally friendly microwave irradiation used in tandem with hydraulic fracturing as an efficient method of improving shale oil and gas recovery.

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Nanostructured materials for microwave receptors

Cited by 53 publications

References 192 publications

Flexible SiC/Si₃N₄ Composite Nanofibers with in Situ Embedded Graphite for Highly Efficient Electromagnetic Wave Absorption

Flexible SiC/Si₃N₄ Composite Nanofibers with in Situ Embedded Graphite for Highly Efficient Electromagnetic Wave Absorption

Electrochemical Detection of Free Chlorine Using Ni Metal Nanoparticles Combined with Multilayered Graphene Nanoshells

Investigation of Microwave Irradiation Stimulation to Enhance the Pore Connectivity of Shale

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Nanostructured materials for microwave receptors

Cited by 53 publications

References 192 publications

Flexible SiC/Si3N4 Composite Nanofibers with in Situ Embedded Graphite for Highly Efficient Electromagnetic Wave Absorption

Flexible SiC/Si3N4 Composite Nanofibers with in Situ Embedded Graphite for Highly Efficient Electromagnetic Wave Absorption

Electrochemical Detection of Free Chlorine Using Ni Metal Nanoparticles Combined with Multilayered Graphene Nanoshells

Investigation of Microwave Irradiation Stimulation to Enhance the Pore Connectivity of Shale

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Flexible SiC/Si₃N₄ Composite Nanofibers with in Situ Embedded Graphite for Highly Efficient Electromagnetic Wave Absorption

Flexible SiC/Si₃N₄ Composite Nanofibers with in Situ Embedded Graphite for Highly Efficient Electromagnetic Wave Absorption