仿生法制备自清洁天然青石表面  

Biomimetic Approach to Self-Cleaning Surfaces of Natural Qingshi Stone

作　　者：段卓琦 谢再新 赵占强 周豹 李汝恒 郑晓虹 胡永茂 Duan Zhuoqi;Xie Zaixin;Zhao Zhanqiang;Zhou Bao;Li Ruheng;Zheng Xiaohong;Hu Yongmao(College of Engineering,Dali University,Dali,Yunnan 671003,China)

机构地区：[1]大理大学工程学院,云南大理671003

出　　处：《大理大学学报》2021年第6期15-21,共7页Journal of Dali University

基　　金：国家自然科学基金项目(11764003);云南省教育厅科学研究基金项目(2020J0544;2018JS414)。

摘　　要：自清洁在天然石材表面保护方面具有重要应用价值。利用聚多巴胺的强黏附性和Al2O3表面Al—OH与烷基磷酸分子的亲水基团—P(O)(OH)2在一定条件下发生缩合反应,生成P—O—Al共价键的特性,用多巴胺Tris-HCl溶液浸泡青石,在其表面生成聚多巴胺黏附层,再用Al2O3纳米颗粒、全氟烷基磷酸和无水乙醇混合液体浸泡,将氟化的Al2O3纳米颗粒黏附到青石表面,获得静态水接触角大于160°,滞后角小于20°的自清洁性能,扫描电子显微镜图像呈现出微/纳米粗糙结构的表面形貌。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.

关 键 词：天然青石 仿生法 微/纳米粗糙结构 自清洁 

分 类 号：O647.5[理学—物理化学]