A tunable infrared emitter based on phase-changing material GST for visible-infrared compatible camouflage with thermal management

Kang, Qianlong; Guo, Kai; Guo, Zhongyi

doi:10.1039/d3cp02983b

Cited by 14 publications

(2 citation statements)

References 61 publications

(64 reference statements)

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“…Nonetheless, the film was mechanically stable without any delamination from the substrate at a strain of 1.2%. The thermal emission of GST emitters has so far been modulated using various methods and structures. ,,− Small dynamic range and fabrication complexity are limitations of plasmonic metastructures. Thermal annealing with planar cavity structures does not allow for the local tuning of emissivity.…”

Section: Resultsmentioning

confidence: 99%

Laser Dynamic Control of the Thermal Emissivity of a Planar Cavity Structure Based on a Phase-Change Material

Kang,

Kim,

Lee

2024

ACS Appl. Mater. Interfaces

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Tailoring the thermal emission of a material in the long-wave infrared (IR) range of 8–13 μm is crucial for many IR-adaptive applications, including personal thermal management, IR camouflage, and radiative cooling. Although various materials and surface structures have been proposed for these purposes, space-selective and dynamic control of their emissivity is challenging. In this study, we present a planar surface cavity structure consisting of a Ge2Sb2Te5 (GST) film on top of a thin metal reflector to modulate its emissivity by using an ultraviolet laser beam. A laser-induced phase change in GST allowed for the local control of emissivity. The average emissivity in the long-wave IR range was tunable from 0.15 to 0.77 simply by changing the laser energy deposited on the GST film. This enabled the laser printing of high-contrast emissivity patterns, which were erasable by subsequent thermal annealing. Emissivity-modulated GST cavities could be fabricated on not only rigid substrates but also flexible plastic substrates such as polyimide. The GST surface cavity was highly flexible and remained stable upon repeated bending to a curvature radius of 0.5 cm. This study provides a promising route for realizing scalable and flexible thermal emitters with tunable surface emissivity.

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Section: Resultsmentioning

confidence: 99%

Laser Dynamic Control of the Thermal Emissivity of a Planar Cavity Structure Based on a Phase-Change Material

Kang,

Kim,

Lee

2024

ACS Appl. Mater. Interfaces

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“…Phase-change cooling technology exploits environmentally friendly organic media with high insulation, moderate boiling points, and stable safety characteristics. The heat absorbed during the vaporization of these media significantly improves the heat transfer efficiency compared to water cooling [13,14]. This technology boasts a low-temperature rise, uniform temperature distribution, excellent insulation properties, nonflammability, nonexplosiveness, and a straightforward system structure.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of electric field-induced phase transition evolution and boiling characteristics in the evaporative cooling medium C₆F₁₂O

Tian,

Wang,

et al. 2024

J. Phys. D: Appl. Phys.

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Phase change cooling technology offers high cooling efficiency, safety, and reliability, representing a novel approach to achieving efficient heat dissipation for high-power and large-capacity electrical equipment. The formulation of the cooling medium is pivotal to phase change cooling technology. However, current media exhibit compatibility, stability, economy, and environmental friendliness deficiencies. Consideration could be given to implementing the C6F12O medium due to its superior overall performance and ability to meet the latent heat requirements in phase change cooling equipment. This paper employs a numerical simulation approach that combines the phase field method based on the Cahn-Hilliard equation with the theory of electrohydrodynamics. It investigates the impact of temperature, electric field intensity, and electric field direction on the evolution of bubble motion and the boiling state of the C6F12O medium, considering the interaction of electric-fluid-heat-phase fields. Numerical results indicate that the system undergoes initial nucleate boiling, nucleate boiling, and film boiling stages at T=330~335 K, T=335~350 K, and T≥355 K, respectively. The introduction of an appropriate electric field can enhance the motion evolution of C6F12O bubbles. However, attention must be paid to the formation of bubble channels under high field strength to prevent potential decreases in insulation performance. An inhomogeneous electric field in the vertical direction proves more effective in improving the bubble release rate compared to a uniform electric field. To some extent, an inhomogeneous electric field in the horizontal direction can prevent the mass accumulation of bubbles in regions of high field intensity. This research has the potential to offer theoretical guidance for the engineering application of the C6F12O phase change cooling medium.

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Research Progress and Recent Advances in Development and Applications of Infrared Stealth Materials: A Comprehensive Review

Zhou,

Rather,

et al. 2024

Laser & Photonics Reviews

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In modern war of “find and destroy,” hiding the target is one of the essential means to improve battlefield survivability of personnel, weapons, and equipment. Infrared stealth technology started to emerge when hiding in the visible light band could no longer meet the protection requirements. With the rapid development of infrared detection technology, infrared stealth materials are gradually diversified. At present, infrared stealth technology no longer focuses only on low infrared emissivity, but from multiple perspectives to achieve target stealth, such as the tunability of optical properties, good thermal management, and multi‐spectral compatibility stealth. At the same time, the infrared stealth of the target is gradually shifted from passive to active, emphasizing dynamic integration of the target and the environment. This review summarizes research progress, development, and application of infrared stealth materials. Camouflage dye and infrared stealth coating are classified as traditional technologies, however new developments and novel processes from literature can be constantly retrieved over the years. In addition to dyeing/coating technologies, this review also highlights advanced infrared stealth materials such as thermal insulation materials, phase change materials, electrochromic materials, metamaterials, and bionic materials. Outlines of the advanced technologies are mainly focused on those published in recent years. Challenges and prospects for the future development of infrared stealth materials are presented at the end of the review.

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A tunable infrared emitter based on phase-changing material GST for visible-infrared compatible camouflage with thermal management

Abstract: Visible-infrared compatible camouflage is of importance to increase the counter-detection ability of target due to the fast development of detection systems. However, most of the previously reported visible-infrared compatible camouflage...

Cited by 14 publications

References 61 publications

Laser Dynamic Control of the Thermal Emissivity of a Planar Cavity Structure Based on a Phase-Change Material

Laser Dynamic Control of the Thermal Emissivity of a Planar Cavity Structure Based on a Phase-Change Material

Numerical simulation of electric field-induced phase transition evolution and boiling characteristics in the evaporative cooling medium C₆F₁₂O

Research Progress and Recent Advances in Development and Applications of Infrared Stealth Materials: A Comprehensive Review

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A tunable infrared emitter based on phase-changing material GST for visible-infrared compatible camouflage with thermal management

Abstract: Visible-infrared compatible camouflage is of importance to increase the counter-detection ability of target due to the fast development of detection systems. However, most of the previously reported visible-infrared compatible camouflage...

Cited by 14 publications

References 61 publications

Laser Dynamic Control of the Thermal Emissivity of a Planar Cavity Structure Based on a Phase-Change Material

Laser Dynamic Control of the Thermal Emissivity of a Planar Cavity Structure Based on a Phase-Change Material

Numerical simulation of electric field-induced phase transition evolution and boiling characteristics in the evaporative cooling medium C6F12O

Research Progress and Recent Advances in Development and Applications of Infrared Stealth Materials: A Comprehensive Review

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Product

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Numerical simulation of electric field-induced phase transition evolution and boiling characteristics in the evaporative cooling medium C₆F₁₂O