Weakly negative permittivity with an extremely low plasma frequency in polyvinyl alcohol/graphene membranous metacomposites

Wang, Zongxiang; Sun, Kai; Tian, Jiahong; He, Qifa; Yang, Pengtao; Duan, Wenxin; Xie, Peitao; Hou, Qing

doi:10.1007/s10854-021-06791-9

Cited by 6 publications

(3 citation statements)

References 50 publications

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“…There are known composites and metamaterials with negative and zero values of ε. They differ from the powders that we have studied by the frequency dispersion ∂ε/∂ω, ohmic losses and the absence of the effect of amplification and inversion of a zero or low-frequency field 13 – 15 .…”

Section: Discussionmentioning

confidence: 66%

Substances with zero static permittivity

Харламов

2022

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The structure of materials with a negative electric susceptibility has been determined. Their electrical properties correspond to vanishing static dielectric permittivity. We give a theoretical explanation of anomalous polarization of powders observed in experiments and the mechanism of emergence in an aerosol cloud of an electric field, which is responsible for spark discharges (lightnings). We also explain the ball lightning properties known from observations. A fundamental scientific problem has been solved and the grounds have been laid for applications of new principles in electronics and electrical engineering.

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Section: Discussionmentioning

confidence: 66%

Substances with zero static permittivity

Харламов

2022

Sci Rep

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“…[14] Therefore, the strongly plasma oscillation effect was responsible for the negative permittivity response for the metal-based epsilon-negative materials. [15] For instance, the negative permittivity was observed due to the construction of copper percolative networks for copper/polyphenylene and copper/rutile composites, which was tailored by diluting the free electron concentration. [16,17] Besides, when the permittivity was switched from positive to negative, a inductive character was observed in barium titanate/ nickel epsilon-negative materials.…”

Section: Introductionmentioning

confidence: 99%

Low‐loss percolative epsilon‐negative composites derived from the ultra‐low percolation threshold

et al. 2022

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In this work, the mechanism of negative permittivity response with low losses in the silver nanowires/polyvinylidene fluoride composites were demonstrated.Due to the large aspect ratios of silver nanowires, ultra-low percolation threshold (f c ) between 0.7 and 0.8 wt% was achieved with the losses effectively decreased by several orders of magnitude down to a low level of about 0.2. The negative permittivity response from Lorentz type and Drude type presented the transition from insulator to conductor. The tunable Drude type negative per-

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“…Composite and metamaterials with a negative real part of the permittivity ε′ have been fabricated. They are characterized by Ohmic loss and frequency dispersion ∂ε′/∂ω 5 – 7 .…”

Section: Introductionmentioning

confidence: 99%

Powders with zero Ohmic resistance

Харламов

2022

Sci Rep

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We substantiate the mechanism of electrical conductivity of powder consisting of dielectric nanoparticles with ionized donor centers on the surface and free electrons in the bulk. It is shown that in a powder switched to a closed dc circuit, the electric field strength vanishes due to the polarization of the powder by the source of the electromotive force. The Ohmic loss becomes impossible. The electrons of the polarized powder are in the states that correspond to the minimum of the powder energy and zero Ohmic resistance. The fulfillment of these conditions does not depend on the temperature (T = 300–500 K) and the strength of the circuit current. The electric current in the powder is maintained on account of the difference in the electrochemical potentials of electrodes that are in contact with the polarized powder.

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Weakly negative permittivity with an extremely low plasma frequency in polyvinyl alcohol/graphene membranous metacomposites

Cited by 6 publications

References 50 publications

Substances with zero static permittivity

Substances with zero static permittivity

Low‐loss percolative epsilon‐negative composites derived from the ultra‐low percolation threshold

Powders with zero Ohmic resistance

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