Decreasing energy consumption is critical to sustainable development. Because temperature regulation for human comfort consumes vast amounts of energy, substantial research efforts are currently directed towards developing passive personal thermal management techniques that cool the human body without any energy consumption1,2,3,4,5,6,7,8,9. Although various cooling textile designs have been proposed previously, textile-based daytime radiative cooling to a temperature below ambient has not been realized6,7,8,9,10,11,12,13. Silk, a natural protein fabric produced by moth caterpillars, is famous for its shimmering appearance and its cooling and comforting sensation on skin14,15,16,17. It has been recently recognized that silk, with its optical properties derived from its hierarchical microstructure, may represent a promising starting point for exploring daytime radiative cooling18,19,20,21. However, the intrinsic absorption of protein in the ultraviolet region prevents natural silk from achieving net cooling under sunlight. Here we explore the nanoprocessing of silk through a molecular bonding design and scalable coupling reagent-assisted dip-coating method, and demonstrate that nanoprocessed silk can achieve subambient daytime radiative cooling. Under direct sunlight (peak solar irradiance >900 W m–2) we observed a temperature of ~3.5 °C below ambient (for an ambient temperature of ~35 °C) for stand-alone nanoprocessed silks. We also observed a temperature reduction of 8 °C for a simulated skin when coated with nanoprocessed silk, compared with natural silk. This subambient daytime radiative cooling of nanoprocessed silk was achieved without compromising its wearability and comfort. This strategy of tailoring natural fabrics through scalable nanoprocessing techniques opens up new pathways to realizing thermoregulatory materials and provides an innovative way to sustainable energy.
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All relevant data are included in the manuscript and Supplementary Information. More detailed protocols, calculations and analyses are available from the authors upon request.
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Rödel, H., Schenk, A., Herzberg, C. & Krzywinski, S. Links between design, pattern development and fabric behaviours for clothes and technical textiles. Int. J. Cloth. Sci. Tech. 13, 217–227 (2001).
Cho, S. C. et al. Surface modification of polyimide films, filter papers, and cotton clothes by HMDSO/toluene plasma at low pressure and its wettability. Curr. Appl. Phys. 9, 1223–1226 (2009).
Parvari, R. A. et al. The effect of fabric type of common Iranian working clothes on the induced cardiac and physiological strain under heat stress. Arch. Environ. Occup. Health 70, 272–278 (2015).
Hsu, P. C. et al. Radiative human body cooling by nanoporous polyethylene textile. Science 353, 1019–1023 (2016).
Peng, Y. et al. Nanoporous polyethylene microfibres for large-scale radiative cooling fabric. Nat. Sustain. 1, 105–112 (2018).
Zhang, X. et al. Dynamic gating of infrared radiation in a textile. Science 363, 619–623 (2019).
Cai, L. et al. Spectrally selective nanocomposite textile for outdoor personal cooling. Adv. Mater. 30, 1802152 (2018).
Hsu, P. C. et al. A dual-mode textile for human body radiative heating and cooling. Sci. Adv. 3, e1700895 (2017).
Raman, A. P., Anoma, M. A., Zhu, L., Rephaeli, E. & Fan, S. Passive radiative cooling below ambient air temperature under direct sunlight. Nature 515, 540–544 (2014).
Zhai, Y. et al. Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime radiative cooling. Science 355, 1062–1066 (2017).
Li, T. et al. A radiative cooling structural material. Science 364, 760–763 (2019).
Mandal, J. et al. Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling. Science 362, 315–319 (2018).
Yang, Y. & Li, S. Silk fabric non-formaldehyde crease-resistant finishing using citric acid. J. Text. Inst. 84, 638–644 (1993).
Gong, R. H. & Mukhopadhyay, S. K. Fabric objective measurement: a comparative study of fabric characteristics. J. Text. Inst. 84, 192–198 (1993).
Huang, F., Wei, Q., Liu, Y., Gao, W. & Huang, Y. Surface functionalization of silk fabric by PTFE sputter coating. J. Mater. Sci. 42, 8025–8028 (2007).
Cai, Z., Jiang, G. & Yang, S. Chemical finishing of silk fabric. Color. Technol. 117, 161–165 (2001).
Shi, N. et al. Keeping cool: enhanced optical reflection and heat dissipation in silver ants. Science 349, 298–301 (2015).
Jin, H. & Kaplan, D. L. Mechanism of silk processing in insects and spiders. Nature 424, 1057–1061 (2003).
Choi, S. et al. Anderson light localization in biological nanostructures of native silk. Nat. Commun. 9, 452 (2018).
Shi, N. et al. Nanostructured fibers as a versatile photonic platform: radiative cooling and waveguiding through transverse Anderson localization. Light Sci. Appl. 7, 37 (2018).
Rosenheck, K. & Doty, P. The far ultraviolet absorption spectra of polypeptide and protein solutions and their dependence on conformation. Proc. Natl Acad. Sci. USA 47, 1775–1785 (1961).
Yang, H., Zhu, S. & Pan, N. Studying the mechanisms of titanium dioxide as ultraviolet-blocking additive for films and fabrics by an improved scheme. J. Appl. Polym. Sci. 92, 3201–3210 (2004).
Wang, J., Tsuzuki, T., Sun, L. & Wang, X. Reverse microemulsion-mediated synthesis of SiO2-coated ZnO composite nanoparticles: multiple cores with tunable shell thickness. ACS Appl. Mater. Interfaces 2, 957–960 (2010).
Fan, J. & Hunter, L. Engineering Apparel Fabrics and Garments (Woodhead Publishing, 2009).
Yusuf, M. A review on flame retardant textile finishing: current and future trends. Curr. Smart Mater. 3, 99–108 (2018).
Patil, P. V., Bendale, D. M., Puri, R. K. & Puri, V. Refractive index and adhesion of Al2O3 thin films obtained from different processes—a comparative study. Thin Solid Films 288, 120–124 (1996).
Mie, G. Beiträge zur Optik trüber Medien, speziell kolloidaler Metallösungen. Ann. Phys. 330, 377–445 (1908).
Steven, E. et al. Carbon nanotubes on a spider silk scaffold. Nat. Commun. 4, 2435 (2013).
Zhang, W. et al. Tensan silk-inspired hierarchical fibers for smart textile applications. ACS Nano 12, 6968–6977 (2018).
Corbet, J. & Mignani, G. Selected patented cross-coupling reaction technologies. Chem. Rev. 106, 2651–2710 (2006).
Riaz, S. et al. Functional finishing and coloration of textiles with nanomaterials. Color. Technol. 134, 327–346 (2018).
Rockwood, D. et al. Materials fabrication from Bombyx mori silk fibroin. Nat. Protoc. 6, 1612–1631 (2011).
We acknowledge the Micro-fabrication Center of the National Laboratory of Solid State Microstructures (NLSSM) for technical support. J.Z. acknowledges the support from the Xplorer Prize. This work was jointly supported by the National Key Research and Development Program of China (grant no. 2017YFA0205700), the National Natural Science Foundation of China (grant nos. 52002168, 12022403, 51925204, 11874211, 62134009, 62121005 and 61735008), the Science Foundation of Jiangsu (grant no. BK20190311), the Excellent Research Program of Nanjing University (grant no. ZYJH005), the research foundation of Frontiers Science Center for Critical Earth Material Cycling (grant no. JBGS2106) and the Fundamental Research Funds for the Central Universities (grant nos. 021314380184, 021314380208, 021314380190, 021314380140 and 021314380150). S.F. acknowledges the support of the US Department of Energy (grant no. DE-FG-07ER46426).
The authors declare no competing interests.
Peer review information Nature Nanotechnology thanks Liangbing Hu and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Supplementary Schematic 1, Figs. 1–16, Discussion and Tables 1 and 2.
Supplementary Video 1
Stretching, flexing and twisting of the NP-silk fabric.
Supplementary Video 2
Dynamic twisting test of NP-silk.
Supplementary Video 3
Deformation of silk sample without TT additive.
Supplementary Video 4
Screen printing process.
Supplementary Video 5
Washing test process.
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Zhu, B., Li, W., Zhang, Q. et al. Subambient daytime radiative cooling textile based on nanoprocessed silk. Nat. Nanotechnol. 16, 1342–1348 (2021). https://doi.org/10.1038/s41565-021-00987-0
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