Dipole correlation effects on the local field and the effective dielectric constant in composite dielectrics containing high-k inclusions

Allahyarov, Elshad; Löwen, Hartmut; Zhu, Lei

doi:10.1039/c6cp03149h

Cited by 39 publications

(55 citation statements)

References 86 publications

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“…In summary, we work here with pairwise magnetic forces. This underlines, for instance, the importance of our results for magnetic elastic composite materials serving as soft actuators [23][24][25] and the transferability of such approaches to corresponding electric situations [32,43]. However, our considerations naturally apply in the same way for any other, not necessarily pairwise forces acting on the particles in an elastic environment.…”

Section: Inclusion Interactionsmentioning

confidence: 88%

Force-induced elastic matrix-mediated interactions in the presence of a rigid wall

Menzel

2017

Soft Matter

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We consider an elastic composite material containing particulate inclusions in a soft elastic matrix that is bounded by a rigid wall, e.g., the substrate. If such a composite serves as a soft actuator, forces are imposed on or induced between the embedded particles. We investigate how the presence of the rigid wall affects the interactions between the inclusions in the elastic matrix. For noslip boundary conditions, we transfer Blake's derivation of a corresponding Green's function from low-Reynolds-number hydrodynamics to the linearly elastic case. Results for no-slip and free-slip surface conditions are compared to each other and to the bulk behavior. Our results suggest that walls with free-slip surface conditions are preferred when they serve as substrates for soft actuators made from elastic composite materials. As we further demonstrate, the presence of a rigid wall can qualitatively change the interactions between the inclusions. In effect, it can switch attractive interactions into repulsive ones (and vice versa). It should be straightforward to observe the effects in future experiments and to combine our results, e.g., with the modeling of biological cells and tissue on rigid surfaces.

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Section: Inclusion Interactionsmentioning

confidence: 88%

Force-induced elastic matrix-mediated interactions in the presence of a rigid wall

Menzel

2017

Soft Matter

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“…In these applications the pores of the metal inclusions are polymer coated and charged 20 by doping with sulfuric acid. Nanocomposite elastomers with these nanoporous metal inclusions, besides generating electrostrictive strains [107,108,109], will also generate additional strain from the interaction of the electrostatic double layers between these highly charged objects. Then the total actuation response of the nanocomposite to the applied field will be greatly enhanced.…”

Section: Discussionmentioning

confidence: 99%

Simulation Study of Ion Diffusion in Charged Nanopores with Anchored Terminal Groups

Allahyarov

Löwen

Taylor

2017

Electrochimica Acta

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We present coarse-grained simulation results for enhanced ion diffusion in a charged nanopore grafted with ionomer sidechains. The pore surface is hydrophobic and its diameter is varied from 2.0 nm to 3.7 nm. The sidechains have from 2 to 16 monomers (united atom units) and contain sulfonate terminal groups. Our simulation results indicate a strong dependence of the ion diffusion along the pore axis on the pore parameters. In the case of short sidechains and large pores the ions mostly occupy the pore wall area, where their distribution is strongly disturbed by their host sulfonates. In the case of short sidechains and narrow pores, the mobility of ions is strongly affected by the structuring and polarization effects of the water molecules. In the case of long sidechains, and when the sidechain sulfonates reach the pore center, a radial charge separation occurs in the pore. Such charge separation suppresses the ion diffusion along the pore axis. An enhanced ion diffusion was found in the pores grafted with medium-size sidechains provided that the ions do not enter the central pore area, and the water is less structured around the ions and sulfonates. In this case, the 3D density of the ions has a hollow-cylinder type shape with a smooth and uninterrupted surface. We found that the maximal ion diffusion has a linear dependence on the number of sidechain monomers. It is suggested that the maximal ion diffusion along the pore axis is attained if the effective length of the sidechain extension into the pore center (measured as twice the gyration radius of the sidechain with the Flory exponent 1/4) is about 1/3 of the pore radius.

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“…Via a one‐pot hydrothermal method, Ag@C core–shell nanoparticles were produced and compounded with epoxy matrix to create percolative nanocomposites that have reduced conductivity. More information on nanodielectric composites and their development is available in several review articles . These remedies could result in additional advantages, such as improved thermal conductivity, which is beneficial for high heat conductance and high‐temperature operation reliability …”

Section: Nanodielectric Materials Explorationmentioning

confidence: 99%

Review of Polymer‐Based Nanodielectric Exploration and Film Scale‐Up for Advanced Capacitors

Tan

2019

Adv Funct Materials

334

166

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The uprising demands for electrical power and electrification requires advanced dielectric functionalities including high capacitance density, high energy density, high current handling capability, high voltage, high temperature, high thermal conductivity, light weight, and environmental reliability. Nanodielectric engineering emerges and attracts extensive efforts from many countries as a result. Unlike prior reviews focusing on lab scale nanocomposite study, this review focuses on recent innovations in polymerbased nanodielectric design on a large scale and their film scale-up efforts for advanced capacitors. The unconventional polymer-nanofiller engineering and their process in the last two decades are discussed. The nanofunctionalized polymers on a molecular level for high dielectric constants and high dielectric strength are briefly described. The challenge associated with film scale-up and retention of nanodielectric properties are then pointed out to be crucial toward a transfer of dielectric and capacitor technology. Several important attempts at scaling up dielectric films and capacitors recently supported by the US government and industry are reviewed. An alternative strategic approach to achieving high performance polymer films is introduced by leveraging 2D surface coating on commercially mature large-scale polymer films. Future pathways for high quality scalable dielectric films exhibiting desirable dielectric properties and feasibility for capacitor manufacturing are suggested.to develop a more compact pulse-forming network for a pulsed high power microwave (HPM), a laser source, aircraft ignition systems, and high-power electrical systems. [1] The US NAVY strove to develop an all-electric warship for advancing its future combat capability (lethality and survivability). This warship required high-power weapons such as electromagnetic railguns for obtaining pin-point accuracy at a very long range electromagnetic launch systems for rapid aircraft and missile deployment and higher-power radar and sonar systems for "seeing" farther through both air and water. The US Army funded the development of the high-energy-density biaxially oriented polypropylene (BOPP) capacitor and the high-temperature polyetherimide dielectric for ground vehicles to realize better serviceability, higher power, and lower mass of the equipment that ground troops carry. [2,3] Although the energy density has been improved up to 3 J cm −3 via metallization control, the performance, and lifetime of BOPP capacitors degrade rapidly with increasing temperature (the ripple current handing capability decreases as the temperature increases from 85 to 105 °C).Improvements in the fault resistance and the reliability of dielectric materials will enable capacitors to withstand higher electrical current and heat without being excessively derated under extreme stress conditions. A large gap remains between the technology availability and the desired properties, such as combined high temperature and energy density and a low dissipation factor. Fa...

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Dipole correlation effects on the local field and the effective dielectric constant in composite dielectrics containing high-k inclusions

Cited by 39 publications

References 86 publications

Force-induced elastic matrix-mediated interactions in the presence of a rigid wall

Force-induced elastic matrix-mediated interactions in the presence of a rigid wall

Simulation Study of Ion Diffusion in Charged Nanopores with Anchored Terminal Groups

Review of Polymer‐Based Nanodielectric Exploration and Film Scale‐Up for Advanced Capacitors

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