Efficient fabrication of tilt micro/nanopillars on polypropylene surface with robust superhydrophobicity for directional water droplet rebound
Yu Du,
Ting Wu,
Xiao-long Li,
Wei-long Zhou,
Chao Ding,
You-qiang Yang,
Jin-gang Wei,
Xiang Lu,
Heng Xie,
Jin-ping Qu
Affiliations
Yu Du
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Huazhong University of Science & Technology, Wuhan 430074, PR China; Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, Huazhong University of Science & Technology, Wuhan 430074, PR China; School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China
Ting Wu
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Huazhong University of Science & Technology, Wuhan 430074, PR China; Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, Huazhong University of Science & Technology, Wuhan 430074, PR China; School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China
Xiao-long Li
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Huazhong University of Science & Technology, Wuhan 430074, PR China; Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, Huazhong University of Science & Technology, Wuhan 430074, PR China; School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China
Wei-long Zhou
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Huazhong University of Science & Technology, Wuhan 430074, PR China; Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, Huazhong University of Science & Technology, Wuhan 430074, PR China; School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China
Chao Ding
Kingfa Science and Technology Co., LTD., Guangzhou, Guangdong 510663, China
You-qiang Yang
Kingfa Science and Technology Co., LTD., Guangzhou, Guangdong 510663, China
Jin-gang Wei
Kingfa Science and Technology Co., LTD., Guangzhou, Guangdong 510663, China
Xiang Lu
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Huazhong University of Science & Technology, Wuhan 430074, PR China; Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, Huazhong University of Science & Technology, Wuhan 430074, PR China; School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China
Heng Xie
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Huazhong University of Science & Technology, Wuhan 430074, PR China; Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, Huazhong University of Science & Technology, Wuhan 430074, PR China; School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China; Corresponding author
Jin-ping Qu
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Huazhong University of Science & Technology, Wuhan 430074, PR China; Hubei Key Laboratory of Material Chemistry and Service Failure and Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, Huazhong University of Science & Technology, Wuhan 430074, PR China; School of Chemistry and Chemical Engineering, Huazhong University of Science & Technology, Wuhan 430074, PR China; Corresponding author
Summary: The directional rebound and transport of water droplets plays an important role in microfluidic devices, anti-fogging, and water harvesting. Herein, an extrusion compression molding and directional stretch demolding method was used to prepare a polypropylene (PP) surface with tilt micro/nanopillars with a contact angle of 157 ± 3°. The rolling angle is the highest (9 ± 4°) when the direction of rotation is opposite the tilt direction of the micro/nanopillars, showing excellent water repellency and anisotropy of the surface. Compared with the position of the first collision of the water droplet, the position of the second collision shifted ∼1.5 mm along the tilt direction of the micro/nanopillars, driven by the surface tension component during the collision. The directional rebound behavior is controlled by the droplet energy and the tilt angle. The micro/nanopillars demonstrate excellent self-cleaning property and mechanical durability, which shows the possibility of their practical engineering applications.
