Publisher Correction: Anderson light localization in biological nanostructures of native silk

Choi, Seung Ho; Kim, Seong Wan; Ku, Zahyun; Visbal-Onufrak, Michelle A.; Choi, Kyoo Wan; Ko, Hakseok; Choi, Wonshik; Urbas, Augustine; Goo, Tae Won; Kim, Young L.

doi:10.1038/s41467-018-03595-0

Cited by 3 publications

(3 citation statements)

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“…Besides, based on Kirchhoff’s law of thermal radiation, strong absorption corresponds to high thermal emission. Therefore, the high thermal emittance of the cocoon is ascribed to the series of vibrational absorptions of silk protein structures (in Figure c). ,, The strong absorption is mainly due to the primary structure of fibroin proteina repetitive amino acid sequence, which can be roughly expressed as (Gly-Ser-Gly-Ala-Gly-Ala) n . ,− The repetitive amino acid sequence that has strong vibrational absorptions in the LWIR spectrum, such as N–H (3500–3100 and 1640–1550 cm –1 , amide I), CO (1680–1630 cm –1 , amide II), C–N (1300–1200 cm –1 , amide III), and C–H (3000–2850 and 1465–1375 cm –1 ), contributes to high thermal emittance for efficient radiative cooling of the silkworm cocoon. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…To find out just how the natural creatures could spontaneously decrease the body temperature, researchers have carried out experiments to explore the mechanism of their thermal regulation instinct. Over the past few years, researchers reported that some natural creatures possess distinctive photonic structures for thermal regulation. − On the one hand, their distinctive photonic structures usually give them the structural white or silver color for reflecting the sunlight and minimizing the heat gain. On the other hand, the structures are made of organic matter which has a high thermal emittance, and then, the microstructures could further enhance the thermal emittance for maximizing the heat loss.…”

Section: Introductionmentioning

confidence: 99%

“…Herein, this work finds that the silkworm cocoon of Bombyx mori protects pupae from the rapid temperature fluctuations via the randomly stacked silk fibers . The microstructure with the randomly stacked silk fibers exhibits high solar reflectance and thermal emittance for efficient radiative cooling.…”

Section: Introductionmentioning

confidence: 99%

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Bioinspired Radiative Cooling Structure with Randomly Stacked Fibers for Efficient All-Day Passive Cooling

Yang

Zhang

2021

ACS Appl. Mater. Interfaces

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Without the help of compression-based cooling systems, natural creatures have to make use of other things to decrease their body temperature to survive under thermally harsh conditions. This work finds that the silkworm cocoon of Bombyx mori protects pupae from the rapid temperature fluctuations via the randomly stacked silk fibers, which possess high solar reflectance and thermal emittance for thermal regulation. Inspired by this microstructure, the melt-blown polypropylene (MB-PP) with randomly stacked fibers is fabricated by a large-scale melt-blown fabrication method. For enhancing the thermal emittance of MB-PP, the surface-modified MB-PP (SMB-PP) is obtained by constructing the poly(dimethylsiloxane) film on the MB-PP. As the reason for its high solar reflectance (∼95%) and thermal emittance (∼0.82), the SMB-PP displays subambient temperature drops of 4 °C in the daytime and 5 °C in the nighttime, respectively. Moreover, building energy simulation indicates that the SMB-PP could save ∼132 GJ (∼58.1% of the baseline energy consumption) for 1 year in the contiguous United States. Overall, the bioinspired structures offer a novel pathway out of cooling buildings, showing great promising application prospects in zero-energy buildings.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bioinspired Radiative Cooling Structure with Randomly Stacked Fibers for Efficient All-Day Passive Cooling

Yang

Zhang

2021

ACS Appl. Mater. Interfaces

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A versatile micro-reflectivity setup for probing the optical properties of photonic nanostructures

Sharma

Priya

Saini

et al. 2019

Review of Scientific Instruments

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The spatial- and spectral-dependent optical reflectivity measurements are essential to characterize various natural as well as artificial micron-scale photonic nanostructures. However, it is onerous to measure spatially and spectrally resolved reflectivity values from such photonic nanostructures due to their size limitations. Here, we discuss the development of a versatile micro-reflectivity setup with an in situ optical microscope combined with high-resolution actuators to measure the reflectivity from areas as small as 25 × 25 µm2. We illustrate the reflectivity measurements from natural as well as artificially prepared ordered and disordered photonic nanostructures. The optical features that are hidden in the conventional reflectivity measurements are clearly resolved using the micro-reflectivity measurements. The proposed setup is also capable of measuring the polarization-dependent reflectivity and transmission of light.

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Enhancement of infrared emissivity by the hierarchical microstructures from the wing scales of butterfly Rapala dioetas

Lou

Yang

et al. 2021

APL Photonics

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Radiative cooling, which normally requires relatively high infrared (IR) emissivity, is one of the insects’ effective thermoregulatory strategies to maintain their appropriate body temperature. Recently, the physical correlation between the delicate biological microstructures and IR emissivity for thermal radiation draws increased attention. Here, a scent patch region on the hindwing of Rapala dioetas butterfly is found to exhibit enhanced IR emissivity compared with the non-scent patch regions. A series of optical simulations are conducted to differentiate the effect of biological structures and material composition on the high IR emissivity. Besides the intrinsic IR absorption (emission) of chitin (the main composition of butterfly wings), the hierarchical microstructures of the scent patch scale further improve the IR absorption (emission) through the increased inner surface area and multi-scattering effect. This enhancement of IR emissivity enables the butterfly to efficiently radiate heat from the scent patch region to the environment with a limited volume of chitin. This study of the correlation between IR emissivity and microstructural designs may offer additional pathways to engineer bioinspired materials and systems for radiative cooling applications.

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Publisher Correction: Anderson light localization in biological nanostructures of native silk

Abstract: The original PDF version of this Article contained errors in Equations 1 and 2. Both equations omitted all Γ terms. This has been corrected in the PDF version of the Article. The HTML version was correct from the time of publication.

Cited by 3 publications

References 0 publications

Bioinspired Radiative Cooling Structure with Randomly Stacked Fibers for Efficient All-Day Passive Cooling

Bioinspired Radiative Cooling Structure with Randomly Stacked Fibers for Efficient All-Day Passive Cooling

A versatile micro-reflectivity setup for probing the optical properties of photonic nanostructures

Enhancement of infrared emissivity by the hierarchical microstructures from the wing scales of butterfly Rapala dioetas

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