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<p>Reversible wettability intelligent surfaces are widely applied in self-cleaning, microfluidics, and other fields. Although dual-responsive surfaces that react to light and heat possess the potential for switching behavior, the further development of switchable wettability surfaces remains constrained by limited cycle stability and complicated preparation processes. In this study, we achieved high cyclic stability in reversible wettability-based aluminum-based surfaces through a synergistic design combining laser-etching and photo-responsive coatings. First, a hierarchical micro-nanostructure was constructed on the aluminum alloy using infrared nanosecond laser etching. An epoxy resin adhesive layer was then sprayed and cured to enhance adhesion. A suspension of hexadecyltrimethoxysilane (HDTMS)-modified TiO<sub>2</sub>/ethanol was subsequently sprayed to form an initial superhydrophobic surface (contact angle &gt; 150°). Ultraviolet irradiation oxidizes the HDTMS alkyl chains, inducing a superhydrophilic state (contact angle &lt; 5°). The surface can undergo wetting property switching 15 times (with a contact angle fluctuation of &lt; 5%). After 15 cycles, local failure was attributed to the irreversible degradation of HDTMS. This study provides new ideas for the design and durability optimization of intelligent wetting surfaces.</p>

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Preparation of TiO2/EP photothermal-responsive coatings on aluminum-based surfaces with switchable wettability

  • 期刊论文

  • 发表日期：

    2026年4月3日

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  • Surong Li,
  • Xia Ye,
  • Xiaohong Yang,
  • Zhenmin Fan,
  • Ziming Lu,
  • Yujie Zhao,
  • Yuhang He,
  • Deo Musinguzi

摘要

Reversible wettability intelligent surfaces are widely applied in self-cleaning, microfluidics, and other fields. Although dual-responsive surfaces that react to light and heat possess the potential for switching behavior, the further development of switchable wettability surfaces remains constrained by limited cycle stability and complicated preparation processes. In this study, we achieved high cyclic stability in reversible wettability-based aluminum-based surfaces through a synergistic design combining laser-etching and photo-responsive coatings. First, a hierarchical micro-nanostructure was constructed on the aluminum alloy using infrared nanosecond laser etching. An epoxy resin adhesive layer was then sprayed and cured to enhance adhesion. A suspension of hexadecyltrimethoxysilane (HDTMS)-modified TiO2/ethanol was subsequently sprayed to form an initial superhydrophobic surface (contact angle > 150°). Ultraviolet irradiation oxidizes the HDTMS alkyl chains, inducing a superhydrophilic state (contact angle < 5°). The surface can undergo wetting property switching 15 times (with a contact angle fluctuation of < 5%). After 15 cycles, local failure was attributed to the irreversible degradation of HDTMS. This study provides new ideas for the design and durability optimization of intelligent wetting surfaces.