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Visible Light-Activated Self-Recovery Hydrophobic CeO2/Black TiO2 Coating Prepared Using Air Plasma Spraying.
Lingyue Hu1, Xuefeng Song1, Xiao Shan1
1Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Material Science and Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China.
ACS Applied Materials & Interfaces
|September 20, 2019
Summary
This study introduces a novel self-healing hydrophobic coating made of cerium oxide (CeO2) and black titanium dioxide (TiO2). This advanced ceramic coating can recover its water-repellent properties after contamination and degradation.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Hydrophobic coatings are essential for various applications but susceptible to contamination.
- Degradation of hydrophobicity by atmospheric contaminants limits the lifespan and effectiveness of current coatings.
Purpose of the Study:
- To develop a novel hydrophobic coating with self-recovery capabilities.
- To investigate the properties of a cerium oxide (CeO2)/black titanium dioxide (TiO2) composite coating prepared via air plasma spraying.
- To understand the mechanism of self-cleaning and hydrophobicity recovery.
Main Methods:
- Air plasma spraying was employed to fabricate CeO2/black TiO2 composite coatings without chemical modification.
- Water contact angle (WCA) measurements were used to assess hydrophobicity before and after contamination (oleic acid).
- Visible light irradiation was used to investigate photodegradation and self-cleaning properties.
Main Results:
- The CeO2/black TiO2 coatings showed decreased WCAs after oleic acid contamination.
- Visible light irradiation induced photodegradation of oleic acid and generated surface oxygen vacancies in black TiO2, leading to superhydrophilicity.
- The composite coating exhibited tunable surface properties, transitioning from hydrophilic to hydrophobic based on CeO2 content.
- Recovered hydrophobicity was observed after storage in a dark, clean environment due to the restoration of black TiO2.
Conclusions:
- The developed CeO2/black TiO2 coating demonstrates effective self-cleaning and self-recovery of hydrophobicity.
- The tunable surface properties and self-healing mechanism make this ceramic coating promising for engineering applications.
- This research offers a new pathway for creating durable and functional hydrophobic surfaces.
