Near‐Infrared Thermochromic Diazapentalene Dyes

Qian, Gang; Wang, Zhi Yuan

doi:10.1002/adma.201104711

Cited by 30 publications

(20 citation statements)

References 43 publications

(26 reference statements)

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“…Although there are many thermochromic polymers and liquid crystals that are used for temperature sensing, 245,246 the broadband infrared properties relevant for thermal emission are typically much less affected by temperature. 247 Likewise, though metamaterials displaying temperature-dependent resonance or narrowband absorption phenomena have also been developed, 248,249 broadband phenomena are required to switch tot and affect the heat transfer.…”

Section: Thermal Regulation Using Emissivity Changes Across Phase Tramentioning

confidence: 99%

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

Wehmeyer

Yabuki

Monachon

et al. 2017

Applied Physics Reviews

366

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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Section: Thermal Regulation Using Emissivity Changes Across Phase Tramentioning

confidence: 99%

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

Wehmeyer

Yabuki

Monachon

et al. 2017

Applied Physics Reviews

366

261

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“…Most DPP‐containing polymers have relatively wide bandgaps, above 1.2 eV. Recently, we modified the DPP structure and obtained a more electron‐deficient DAP unit 44–46. The lactam in DPP can be transformed into the two lactim chromophores, PPO and DAPO (Figure ).…”

Section: Near‐infrared Polymersmentioning

confidence: 99%

“…Recently, we modified the DPP structure and obtained a more electron-deficient DAP unit. [44][45][46] The lactam in DPP can be transformed into the two lactim chromophores, PPO and DAPO (Figure 16). By analogy, dithioketopyrrolopyrrole (DTPP), derived from DPP by thionation, can also yield two new chromophores, PPT and DAP.…”

Section: Near-infrared Polymersmentioning

confidence: 99%

Advances in Organic Near-Infrared Materials and Emerging Applications

Qiao

Wang

2016

The Chemical Record

Self Cite

103

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Much progress has been made in the field of research on organic near-infrared materials for potential applications in photonics, communications, energy, and biophotonics. This account mainly describes our research work on organic near-infrared materials; in particular, donor-acceptor small molecules, organometallics, and donor-acceptor polymers with the bandgaps less than 1.2 eV. The molecular designs, structure-property relationships, unique near-infrared absorption, emission and color/wavelength-changing properties, and some emerging applications are discussed.

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“…There are also reports on TC-pigments being characterized. 36,37 This development is of interest in spectral design for thermal control purposes, especially on simple lightweight systems like uniforms.…”

Section: Methods and Literaturementioning

confidence: 99%

A review of materials for spectral design coatings in signature management applications

Andersson

Åkerlind

2014

SPIE Proceedings

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The current focus in Swedish policy towards national security and high-end technical systems, together with a rapid development in multispectral sensor technology, adds to the utility of developing advanced materials for spectral design in signature management applications. A literature study was performed probing research databases for advancements. Qualitative text analysis was performed using a six-indicator instrument: spectrally selective reflectance; low gloss; low degree of polarization; low infrared emissivity; non-destructive properties in radar and in general controllability of optical properties. Trends are identified and the most interesting materials and coating designs are presented with relevant performance metrics. They are sorted into categories in the order of increasing complexity: pigments and paints, one-dimensional structures, multidimensional structures (including photonic crystals), and lastly biomimic and metamaterials. The military utility of the coatings is assessed qualitatively. The need for developing a framework for assessing the military utility of incrementally increasing the performance of spectrally selective coatings is identified.

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Near‐Infrared Thermochromic Diazapentalene Dyes

Cited by 30 publications

References 43 publications

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

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

Advances in Organic Near-Infrared Materials and Emerging Applications

A review of materials for spectral design coatings in signature management applications

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