YANG Hua-rong,LI Meng,ZHAO Xin,ZHAO Hao-dong,HUANG Cheng-chao.Preparation and Performance of Magnetically Induced Super-hydrophobic Flexible Film[J],51(12):303-311
Preparation and Performance of Magnetically Induced Super-hydrophobic Flexible Film
  
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DOI:10.16490/j.cnki.issn.1001-3660.2022.12.031
KeyWord:super-hydrophobic  micro-nano structure  magnetically responsive  adhesion  self-cleaning
              
AuthorInstitution
YANG Hua-rong Faculty of Aerospace Engineering, Civil Aviation Flight University of China, Sichuan Guanghan , China
LI Meng Faculty of Aerospace Engineering, Civil Aviation Flight University of China, Sichuan Guanghan , China
ZHAO Xin Faculty of Aerospace Engineering, Civil Aviation Flight University of China, Sichuan Guanghan , China
ZHAO Hao-dong Faculty of Aerospace Engineering, Civil Aviation Flight University of China, Sichuan Guanghan , China
HUANG Cheng-chao Faculty of Aerospace Engineering, Civil Aviation Flight University of China, Sichuan Guanghan , China
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Abstract:
      The work aims to prepare super-hydrophobic flexible film with good self-cleaning and portability by simple scheme on the different structured template surfaces. It is an extremely simple and efficient method to prepare hydrophobic thin films with low cost (143 yuan/m2), short product cycle time (15 h), and self-cleaning and excellent structural adaptability for experimental samples and such films have great promise in biomedical, transportation and energy applications. Magnetic particles in an external magnetic environment responded spontaneously to a chain of common-linear dipole moment particles parallel to the applied magnetic field in order to maintain the lowest energy equilibrium state. By controlling the magnitude of magnetic induction in the external environment, the height, width and spacing between the magneto-cones formed by the lateral agglomeration of magnetic particle chains in the microstructure were adjusted to obtain the best anti-wetting state of water droplets on the surface of flexible films. This study focused on the effects of the formulation parameters of the magnetic mixture, the cured substrate of the hydrophobic films and the external magnetic induction strength on the hydrophobic properties of the sample films. The magnetic mixture of different concentrations was prepared with different particle sizes of carbonyl iron powder as the dispersed phase and polydimethylsiloxane as the carrier, and then the magnetic mixture was applied to the smooth primary structured template and the secondary structured template with regular microstructure by the film applicator, and placed in the external magnetic field environment, and the coating was pre-cured at room temperature for 12 h, and then moved to the vacuum drying oven at 120 ℃ for 3 h. The coating was cured for 3 h to form a flexible film with hydrophobic properties. The flexible films formed on the surface of secondary structured templates were observed by scanning electron microscopy, which had more diverse microstructures than the flexible films formed on the surface of primary structured templates, facilitating the formation of Cassie-Wenzel states on the surface of the films by water droplets. The wetting performance of 5 μL water droplets on the surface of flexible films was tested by contact angle measuring instrument. The results showed that the static contact angle of water droplets on the surface of flexible films was more than 150°, and the rolling angle was less than 10°, and the adhesion of water droplets on the surface of flexible films was low, and the rolling process could take away impurities on the surface of films, showing good self-cleaning property. Secondly, the film sample structure was highly adaptable and could be used on the surface of various complex configurations of components. The continuous magneto-microcones formed on the primary and secondary structured template surfaces can make the surface of the flexible films prepared under specific conditions completely superhydrophobic, but the overall hydrophobic performance of the flexible hydrophobic films formed on the secondary structured template surface is better than that of the flexible hydrophobic films formed on the primary structured template surface. The scheme has the advantages of simple operation, low price, short preparation cycle and the preparation process is harmless to both human body and the environment, which is suitable for industrial production, and the hydrophobic properties of hydrophobic films under different preparation parameters are characterized to lay the foundation for further functional development such as active deicing.
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