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Significant broadband extinction abilities of bioaerosols

生物气溶胶具有显著的宽带消光能力

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Abstract

Bioaerosol, an important constituent of the atmosphere, can directly affect light radiation characteristics due to absorption and scattering effects. Current research lacks a reasonable explanation for the extinction abilities of bioaerosols in a broadband. Herein, we measured the reflectance spectra of 12 common biomaterials and calculated their complex refractive indexes. The peaks of the imaginary part of the complex refractive indexes are located at wavelengths of approximately 0.7, 2.7, 6.1 and 9.5 μm. Based on photographs of the floating structures of bioaerosols, we constructed a model for calculating the extinction abilities of bioaerosols in the wavelength range of 240 nm to 14 μm. Taking AN02 spores as an example, absorption was found to account for more than 90% of the total extinction. In addition, the theoretical calculations and experimental data of transmittance corresponding to the smoke box show that bioaerosol exhibits significant broadband extinction ability from UV to IR bands, which provides new directions for the development of broadband light attenuation materials.

中文摘要

生物气溶胶是大气的重要组成部分, 因其吸收和散射效应, 可直接影响光辐射特性. 当前对于生物气溶胶是否具有宽波段消光特性 的研究还不够充分. 本文中, 我们测量了12种常见生物材料在240 nm–14 μm波段内的反射光谱, 并结合K-K算法计算了不同生物气溶胶材 料的复折射率. 我们发现, 不同种质生物气溶胶的吸收峰具有共性, 位于约0.7, 2.7, 6.1和9.5 μm处. 基于烟幕箱中生物气溶胶漂浮状态实际 结构的照片, 我们构建了模型计算240 nm–14 μm波长范围内生物气溶胶的消光能力. 以AN02孢子为例, 我们发现吸收作用占AN02孢子群 消光总量的90%以上. 此外, 我们对比了生物气溶胶理论计算透过率与大型烟幕箱实测透射率数据, 理论计算和实验验证都显示生物气溶 胶在紫外到红外波段具有显著的宽波段消光能力. 这一发现为宽波段消光材料的发展提供了新的研究方向.

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Acknowledgements

We thank Professor B. T. Draine of Princeton University for providing the main program of DDA. This work was supported by the National Natural Science Foundation of China (61271353 and 60908033), and the Natural Science Foundation of Anhui Province (1408085MKL47).

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Authors and Affiliations

  1. State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Hefei, 230037, China

    Yihua Hu  (胡以华), **nying Zhao  (赵欣颖), Youlin Gu  (顾有林), ** Chen  (陈曦), **nyu Wang  (王新宇) & **ao Dong  (董骁)

  2. Anhui Province Key Laboratory of Electronic Restriction, National University of Defense Technology, Hefei, 230037, China

    Yihua Hu  (胡以华), **nying Zhao  (赵欣颖), Youlin Gu  (顾有林), ** Chen  (陈曦), **nyu Wang  (王新宇) & **ao Dong  (董骁)

  3. Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230001, China

    Peng Wang  (王鹏) & Zhiming Zheng  (郑之明)

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  1. Yihua Hu  (胡以华)
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  2. **nying Zhao  (赵欣颖)
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  6. Peng Wang  (王鹏)
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  7. Zhiming Zheng  (郑之明)
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  8. **ao Dong  (董骁)
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Correspondence to **nying Zhao  (赵欣颖).

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Yihua Hu received his BSc degree in radar engineering from the Electronic Engineering Institute of PLA (1983), MSc degree in circuits and systems from **'an University of Electronic Science and Technology (1988), and PhD degree in optics from Anhui Institute of Optics and Mechanics, Chinese Academy of Sciences (1997). He is now a professor of optical engineering at the National University of Defense Technology. His research interests include spatial information acquisition and processing technology, laser detection and imaging technology and photoelectric information and image processing.

**nying Zhao received her BSc degrees in information engineering and MSc in optical engineering from the National University of Defense Technology. She is now a PhD candidate at the National University of Defense Technology. Her research interests include the interaction of light and matter, particle scattering and functional materials.

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Hu, Y., Zhao, X., Gu, Y. et al. Significant broadband extinction abilities of bioaerosols. Sci. China Mater. 62, 1033–1045 (2019). https://doi.org/10.1007/s40843-018-9411-9

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