Heat transport in polymer-dispersed liquid crystals under electric field

Sahraoui, Abdelhak Hadj; Delenclos, S.; Longuemart, S.; Dădârlat, D.

doi:10.1063/1.3610445

Cited by 14 publications

(15 citation statements)

References 16 publications

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“…The latter could be due to the reduction in droplet size at low LC concentrations, which in principle increases the ratio, γ , for a same Kapitza radius. Interestingly, these values are comparable to the one found previously for PS/5CB composites [7].…”

Section: Order Parameters Of Pdlc Filmsupporting

confidence: 91%

“…Our previous studies [7] of PS/5CB PDLC samples show that the heat transport through PDLCs are affected both by the presence of an external EF and because of the variation in LC volume fraction. Here the sample's thermal conductivity increased monotonically and reached a saturation value with * hadj@univ-littoral.fr respect to an increase in the applied EF.…”

Section: Introductionmentioning

confidence: 97%

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Maxwell-Wagner-Sillars effects on the thermal-transport properties of polymer-dispersed liquid crystals

Kuriakose¹,

Longuemart²,

Depriester³

et al. 2014

Phys. Rev. E

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We present the depolarization field effects (Maxwell-Wagner-Sillars effect) for the thermal transport properties of polymer dispersed liquid crystal composites under a frequency-dependent electric field. The experiments were conducted on polystyrene/4-Cyano-4'-pentylbiphenyl (PS/5CB) PDLCs of 73 vol.% and 85 vol.% liquid crystal (LC) concentrations. A self-consistent field approximation model is used to deduce the electrical properties of polymer and LC materials as well as the threshold electric field. Electric field-varying (at constant frequency) experiments were also conducted to calculate the interfacial thermal resistance between the LC droplets and polymer matrix as well as to find the elastic constant of LCs in droplet form.

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Section: Order Parameters Of Pdlc Filmsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 97%

Maxwell-Wagner-Sillars effects on the thermal-transport properties of polymer-dispersed liquid crystals

Kuriakose¹,

Longuemart²,

Depriester³

et al. 2014

Phys. Rev. E

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show abstract

“…158 Shin et al 159 achieved r ¼ 1.5 by heating the liquid crystal to a high temperature disordered state, applying a B field to align the molecules, and then cooling to the high-viscosity aligned state to freeze in the orientation before removing the field. Sahraoui et al 160 measured similar r using E fields to align polymerdispersed liquid crystals. In this measurement, the liquid crystal recovered its isotropic orientation once the E field was removed.…”

Section: -12mentioning

confidence: 99%

Thermal diodes, regulators, and switches: Physical mechanisms and potential applications

Wehmeyer

Yabuki

Monachon

et al. 2017

Applied Physics Reviews

380

261

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Interest in new thermal diodes, regulators, and switches has been rapidly growing because these components have the potential for rich transport phenomena that cannot be achieved using traditional thermal resistors and capacitors. Each of these thermal components has a signature functionality: Thermal diodes can rectify heat currents, thermal regulators can maintain a desired temperature, and thermal switches can actively control the heat transfer. Here, we review the fundamental physical mechanisms of switchable and nonlinear heat transfer which have been harnessed to make thermal diodes, switches, and regulators. The review focuses on experimental demonstrations, mainly near room temperature, and spans the fields of heat conduction, convection, and radiation. We emphasize the changes in thermal properties across phase transitions and thermal switching using electric and magnetic fields. After surveying fundamental mechanisms, we present various nonlinear and active thermal circuits that are based on analogies with well-known electrical circuits, and analyze potential applications in solid-state refrigeration and waste heat scavenging.

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“…[ 62 ] This effect can be produced by applying an electric field across the liquid crystal sample. [ 63–65 ] For applying this principle to a thermal switch, the liquid crystal in a closed compartment between the heat source and the heat sink must be surrounded with two pairs of oppositely placed electrodes. During the off state, the voltage is applied to one pair of opposite electrodes, and the resulting electric field aligns the molecules in a direction that results in low thermal conductivity.…”

Section: Fluidic Thermal Control Devicesmentioning

confidence: 99%

Fluidic and Mechanical Thermal Control Devices

Klinar

Swoboda

Rojo

et al. 2020

Adv Elect Materials

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In recent years, intensive studies on thermal control devices have been conducted for the thermal management of electronics and computers as well as for applications in energy conversion, chemistry, sensors, buildings, and outer space. Conventional cooling or heating techniques realized using traditional thermal resistors and capacitors cannot meet the thermal requirements of advanced systems. Therefore, new thermal control devices are being investigated to satisfy these requirements. These devices include thermal diodes, thermal switches, thermal regulators, and thermal transistors, all of which manage heat in a manner analogous to how electronic devices and circuits control electricity. To design or apply these novel devices as well as thermal control principles, this paper presents a systematic and comprehensive review of the state‐of‐the‐art of fluidic and mechanical thermal control devices that have already been implemented in various applications for different size scales and temperature ranges. Operation principles, working parameters, and limitations are discussed and the most important features for a particular device are identified.

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Heat transport in polymer-dispersed liquid crystals under electric field

Cited by 14 publications

References 16 publications

Maxwell-Wagner-Sillars effects on the thermal-transport properties of polymer-dispersed liquid crystals

Maxwell-Wagner-Sillars effects on the thermal-transport properties of polymer-dispersed liquid crystals

Thermal diodes, regulators, and switches: Physical mechanisms and potential applications

Fluidic and Mechanical Thermal Control Devices

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