Research Progress on Preparation Process of Superhydrophobic Polytetrafluoroethylene

doi:10.11902/1005.4537.2022.176

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 231-241 DOI: 10.11902/1005.4537.2022.176

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Research Progress on Preparation Process of Superhydrophobic Polytetrafluoroethylene

LIAN Yancheng¹, LIANG Fuyuan¹, HE Jianchao², LI Jin², WU Junwei¹^,²(

), LENG Xuesong²

^1.School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
^2.Institute of Special Environmental and Material Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China

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Abstract

With low surface energy and high chemical stability, polytetrafluoroethylene (PTFE) has received a lot of attention in the fields of superhydrophobicity and anti-corrosion applications from both research and industry. For PTFE bulk materials, superhydrophobicity can be achieved by increasing the surface roughness alone, while thin films of superhydrophobicity have the advantages of applying on different substrates, which can also benefit from PTFE. In this paper, we present a comprehensive review of the ideas of developing superhydrophobic materials and thin films from PTFE materials. Firstly, the processing processes of superhydrophobic PTFE bulk and thin film materials are summarized, and the development results and characteristics of each method are explained. Secondly, to further enhance the properties of superhydrophobic films, numerous researchers have modified the films by doping to achieve enhanced durability and integration with other properties, respectively. Finally, an outlook on the development of PTFE superhydrophobic materials and their applications in corrosion prevention is also presented.

Key words: polytetrafluoroethylene superhydrophobicity thin film doping corrosion protection

Received: 30 May 2022 32134.14.1005.4537.2022.176

ZTFLH:

TG172

About author: WU Junwei, E-mail: junwei.wu@hit.edu.cn

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Cite this article:

LIAN Yancheng, LIANG Fuyuan, HE Jianchao, LI Jin, WU Junwei, LENG Xuesong. Research Progress on Preparation Process of Superhydrophobic Polytetrafluoroethylene. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 231-241.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.176 OR https://www.jcscp.org/EN/Y2023/V43/I2/231

Fig.1 Schematic diagrams of Young's model (a), Wenzel model (b) and Cassie-Baxter model (c)

Fig.2 Surface SEM images (a) and optical images of water-repellent performance (b) under P=2.4 MPa, T_s=190 ℃ (a1, b1), P=4.0 MPa, T_s=190 ℃ (a2, b2), P=7.2 MPa, T_s=190 ℃ (a3, b3) and P=7.2 MPa, T_s=230 ℃ (a4, b4) (the default t_c=1 min, t_s=10 min)^[30]

Fig.3 SEM images of PTFE superhydrophobic surface after 5 times processing with 3 W (a), 4 W (b), 5 W (c), 6 W (d), 7 W (e) and 8 W (f) processing power^[31]

Fig.4 FESEM images of pristine and ion beam treated PTFE surfaces at normal angle of incidence: (a) Pristine, (b) 300 eV, (c) 500 eV, (d) 800 eV. High magnification images are shown in insets. Ion beam treatment time is 60 s^[33]

Fig.5 2D AFM images of PTFE surface treated at 50 W (a), 150 W (b), 300 W (c)^[40] and variation in the average surface roughness of PTFE surfaces with RF power (d)^[35]. Ar plasma treatment time is 5 min, and variation in static water contact angle (WCA) with radiofrequency (RF) power and plasma treatment time

Fig.6 Morphologies of precursor membranes (a1-a4) and corresponding sintered membranes (b1-b4) at different Pullulan/PTFE mass ratios (1:13 (a1, b1), 1:9 (a2, b2), 1:7 (a3, b3), 1:5 (a4, b4)). The cross section of the sintered hollow fiber membrane at 380 ℃ (c1-c4)^[41]

Fig.7 SEM image (a, c) and XPS spectrum (b, d) of C 1s of the rf-sputtered PTFE film with a thickness of 450 nm (a, b)^[54], and C 1s of a Cat-CVD PTFE film coated on the RF-sputtered PTFE film (c, d)^[43]

Fig.8 FE-SEM images of the PTFE-SiO₂ thin films with different SiO₂ nanoparticles^[45]: (a) 0 g/L, (b) 0.5 g/L, (c) 1 g/L, (d) 2 g/L, (e) 5 g/L. With magnification 50,000. SiO₂ nanoparticle effects (f) and temperature effects (g) on the water contact angle of the PTFE-SiO₂ thin film surface^[45]

Fig.9 FESEM images of as-electrospun PTFE/PVA/POSS nanofibrous membranes before calcination (a1-a4) and after calcination (b1-b4), and three-dimensional confocal microscopy images of PTFE/POSS nanofibrous membranes after calcination (c1-c4)^[47] of #PTFE (a1-c1); #POSS-1 (a2-c2); #POSS-2 (a3-c3) and #POSS-3 (a4-c4)

Fig.10 Cross-sectional FE-TEM images of Ag- PPFC nanocomposite films coated on a PET substrate (a) and Super-hydrophobic front and back surfaces of the coated fabric, with inset showing measurement of the water contact angle (b)^[50]

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