Journal of Dali University ›› 2021, Vol. 6 ›› Issue (6): 15-21.

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Biomimetic Approach to Self-Cleaning Surfaces of Natural Qingshi Stone

  

  1. College of Engineering, Dali University, Dali, Yunnan 671003, China
  • Received:2020-08-03 Online:2021-06-15 Published:2021-06-29

Abstract: Self-cleaning surfaces have significant applications in the protection of natural stone surfaces. Based on the strong adhesion of polydopamine and the condensation reaction between the Al—OH on the surface of Al2O3 and the —P(O)(OH)2 group of
alkylphosphoric acid form P—O—Al covalent bond, Qingshi stone was soaked in Tris-HCl solution of dopamine to form the adhesion
layer on its surface. A layer of fluorinated Al2O3 nanoparticles was constructed on the surface of the Qingshi stone by a soaking in
absolute ethyl alcohol dispersion contains Al2O3 nanoparticles and fluorophosphonic acid C10(FPA). Water static contact angles bigger than 160° and hysteretic angles smaller than 20° were obtained on the self-cleaning surfaces. The SEM images of as-prepared Qingshi stone surfaces show a micro/nanoscale roughness.

Key words: natural Qingshi stone, biomimetic method, micro/nanoscale roughness, self-cleaning