title: Nacre biomimetic design--a possible approach to prepare low infrared emissivity composite coatings.
abstract: Mimicking the highly organized brick-and-mortar structure of nacre, a kind of nacre-like organic-inorganic composite material of polyurethane (PU)/flaky bronze composite coatings with low infrared emissivity was successfully designed and prepared by using PU and flaky bronze powders as adhesives and pigments, respectively. The infrared emissivity and microstructure of the coatings were systematically investigated by infrared emissometer and scanning electron microscopy, respectively, and the cause of low infrared emissivity of the coatings was discussed by using the theories of one-dimensional photonic structure. The results show that the infrared emissivity of the nacre-like PU/flaky bronze composite coatings can be as low as 0.206 at the bronze content of 60 wt. %, and it is significantly lower than the value of PU/sphere bronze composite coatings. Microstructure observation illustrated that the nacre-like PU/flaky bronze composite coatings have similar one-dimensional photonic structural characteristics. The low infrared emissivity of PU/flaky bronze composite coatings is derived from the similar one-dimensional photonic structure in the coatings.
authors.affiliation: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Jiang Jun Road 29, Nanjing 211106, China. abczwg15@163.com
authors.forename: Weigang
authors.initials: W
authors.lastname: Zhang
authors.affiliation: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Jiang Jun Road 29, Nanjing 211106, China.
authors.forename: Guoyue
authors.initials: G
authors.lastname: Xu
authors.affiliation: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Jiang Jun Road 29, Nanjing 211106, China.
authors.forename: Ruya
authors.initials: R
authors.lastname: Ding
authors.affiliation: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Jiang Jun Road 29, Nanjing 211106, China.
authors.forename: Kaige
authors.initials: K
authors.lastname: Duan
authors.affiliation: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Jiang Jun Road 29, Nanjing 211106, China.
authors.forename: Jialiang
authors.initials: J
authors.lastname: Qiao
mesh_terms: D000497:Alloys / Q000737:chemistry; D032701:Biomimetics / Q000379:methods*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D007259:Infrared Rays; D008855:Microscopy, Electron, Scanning; D060734:Nacre / Q000737:chemistry*; D017785:Photons; D011140:Polyurethanes / Q000737:chemistry
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; D060734:Nacre; D011140:Polyurethanes