Research Progress of Self-cleaning Technology of Cement-based Superhydrophobic Materials
ZHAO Yi1,*, WANG Jia1, ZHOU Jiao1, WANG Mengyu2, YANG Zhen2
1 School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074,China 2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074,China
Abstract: Superhydrophobic materials, as a new family of intelligent bionic materials, have been widely used in aerospace, construction, electricity gene-ration and other fields, due to their excellent self-cleaning, anti-ice-condensation and anti-corrosion properties; however, their use in the highway transportation field is still in the exploratory stage of research. The self-cleaning properties of cement-based superhydrophobic materials originate from the ‘lotus effect' found in nature. The micro-nano structure and low surface energy of a superhydrophobic surface reduce adhesion between pollutants and the coating. These two effects endow the surface of a cement-based material with excellent self-cleaning properties, thereby providing a new paradigm for the active antifouling of such materials. The theory surrounding the self-cleaning behavior of cement-based superhydrophobic materials is presently immature, as is the corresponding technology. Cement-based superhydrophobic materials are mainly prepared through the cooperation of surface micro-nano composite structures and low surface energy chemicals, which facilitate their self-cleaning functions. Techniques for preparing cement-based superhydrophobic mate-rials mainly include hydrophobically modifying surfaces and integrating hydrophobic modifications. Hydrophobic materials like silanes/siloxanes and stearic acid are frequently used, because they are environmentally friendly and inexpensive. Treatment methods that endow the surfaces of cement-based materials with superhydrophobicity mainly include coating, templating, and layer-by-layer self-assembly. Superhydrophobically modifying a surface has little effect on the mechanical strength of the cement-based material, while integral superhydrophobic modification delays cement hydration reactions and reduces the mechanical strength of the cement-based material through the inclusion of the hydrophobic material. Cement-based superhydrophobic surface coatings are more widely used, because of simple construction, cost effectiveness, and low energy consumption. While methods for evaluating the self-cleaning performance of cement-based superhydrophobic materials have not been unified, the simulated pollutant collection method is widely used. Preparation techniques, evaluation methods and material durability require further study from the perspective of practical engineering applications, as multiple factors affect the engineering structures of cement-based superhydrophobic materials. In this paper, we summarize progress in self-cleaning-technology research for cement-based superhydrophobic materials. The self-cleaning mechanisms of superhydrophobic surfaces, preparation technologies, performance analyses and methods for evaluating the self-cleaning performance of these materials are introduced. Problems associated with this self-cleaning technology are discussed, and prospects are proposed, with the aim of providing a reference for the preparation of durable and environmentally friendly new cement-based superhydrophobic materials.
通讯作者:
*赵毅,博士,重庆交通大学材料科学与工程学院教授、硕士研究生导师。2017年6月在重庆交通大学交通运输工程专业取得博士学位;2018年至今在招商局重庆交通科研设计院有限公司进行博士后研究工作。主要从事功能性路面材料研发与应用技术研究。近年来,在路面材料领域发表SCI/EI论文10余篇,包括Construction and Building Materials、Progress in Organic Coatings、《建筑材料学报》《哈尔滨工业大学学报》等。1585513635@qq.com
引用本文:
赵毅, 王佳, 周娇, 王梦雨, 杨臻. 水泥基超疏水材料自清洁技术研究进展[J]. 材料导报, 2023, 37(6): 21100243-17.
ZHAO Yi, WANG Jia, ZHOU Jiao, WANG Mengyu, YANG Zhen. Research Progress of Self-cleaning Technology of Cement-based Superhydrophobic Materials. Materials Reports, 2023, 37(6): 21100243-17.
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