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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

Postal Subscription Code 80-974

2018 Impact Factor: 1.701

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Front. Mater. Sci.    2016, Vol. 10 Issue (3) : 320-327    https://doi.org/10.1007/s11706-016-0343-y
RESEARCH ARTICLE
Preparation of microstructure-controllable superhydrophobic polytetrafluoroethylene porous thin film by vacuum thermal-evaporation
Na YI1,2,Shanhu BAO1,Huaijuan ZHOU1,2,Yunchuan XIN1,2,Aibin HUANG1,2,Yining MA1,2,Rong LI1,Ping JIN1,3,*()
1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
2. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
3. Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
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Abstract

The three-dimensional porous network polytetrafluoroethylene (PTFE) thin films were achieved by a vacuum technique through evaporating the pure PTFE powders. The surfaces of PTFE thin films showed various morphologies by adjusting the evaporation temperature and the corresponding contact angle ranging from 133° to 155°. Further analyses of surface chemical composition and morphology by FTIR and FE-SEM revealed that the origin of hydrophobicity for the PTFE thin films could be ascribed to the fluorine-containing?groups and the surface morphologies, indicating that abundant −CF2 groups and network structures with appropriate pore sizes played a vital role in superhydrophobicity. By characterization of UV-Vis, the films also showed high transmittance and antireflection effect. The films prepared by this simple method have potential applications such as waterproof membrane and self-cleaning coating.
Keywords polytetrafluoroethylene (PTFE)      vacuum      superhydrophobicity     
Corresponding Author(s): Ping JIN   
Online First Date: 24 May 2016    Issue Date: 08 August 2016
 Cite this article:   
Na YI,Shanhu BAO,Huaijuan ZHOU, et al. Preparation of microstructure-controllable superhydrophobic polytetrafluoroethylene porous thin film by vacuum thermal-evaporation[J]. Front. Mater. Sci., 2016, 10(3): 320-327.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-016-0343-y
https://academic.hep.com.cn/foms/EN/Y2016/V10/I3/320
Fig.1  A schematic of the vacuum evaporation system for PTFE evaporation.
Fig.2  FTIR absorption spectra of PTFE film on CaF2 substrate deposited at different temperatures (360°C, 380°C, and 450°C).
Fig.3  (a) XPS survey scan and (b) binding energy of C 1s of PTFE thin film deposited on CaF2 substrate at 380°C.
Fig.4  Surface FE-SEM images of PTFE thin films deposited on Si substrate at (a) 360°C, (b) 380°C, and (c) 450°C. (d) A cross-sectional FE-SEM image of the sample prepared at 380°C.
Fig.5  Transmittance spectra of PTFE thin films deposited on glass plates under different deposition temperatures (360°C, 380°C, and 450°C).
Fig.6  The water contact angle and the sliding angle dependences on the evaporation temperature.
Fig.7  Model simulation of the water drop on the porous film deposited at (a) 450°C and (b) 380°C.
Fig.8  (a) Kieselguhr powders contaminated superhydrophobic surface, (b)(c) a water drop roll on the surface, and (d) after water drops took away the contaminants.
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