Superhydrophobic PDMS fabricated with a femtosecond pulsed laser for inhibiting icicle formation

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  • Sakurai Toshimitsu
    Civil Engineering Research Institute for Cold Region, Public Works Research Institute
  • Somekawa Toshihiro
    Institute for Laser Technology Institute of Laser Engineering, Osaka University
  • Hirai Yuji
    Department of Applied Chemistry and Bioscience, Chitose Institute of Science and Technology (CIST)
  • Matsushita Hiroki
    Civil Engineering Research Institute for Cold Region, Public Works Research Institute

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  • フェムト秒パルスレーザーを利用したPDMSの超撥水性と氷柱の形成抑制について
  • フェムトビョウ パルスレーザー オ リヨウ シタ PDMS ノ チョウハッスイセイ ト ヒョウチュウ ノ ケイセイ ヨクセイ ニ ツイテ

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Abstract

<p>Snow and ice shed from highway structures can disrupt traffic, sometimes causing accidents. Anti-icing coating materials are used to prevent snow and ice from adhering to highway structures. However, most materials need to be repainted every few years. Here we examine water repellency at sub-zero temperatures and icicle formation for a superhydrophobic polydimethylsiloxane (PDMS) produced using femtosecond laser processing. When femtosecond laser pulses are irradiated onto stainless steel, a laser-induced periodic surface structure (LIPSS) is formed on the surface. When the structure is molded onto PDMS, the PDMS is found to exhibit super-hydrophobicity, with a water contact angle of 162.4±2.9° and a water sliding angle of about 3.0±0.8°. Experiments were conducted in which water droplets at 0.8±0.6 °C were continuously dropped onto a superhydrophobic PDMS surface at −11.9 °C±2 °C, forcing the formation of icicles. The water droplets were found to roll off the superhydrophobic PDMS immediately, which might inhibit the formation of ice and icicles. However, water droplets also froze on the superhydrophobic PDMS surface, indicating that a superhydrophobic surface with LIPSS inhibits the formation of ice but does not afford complete anti-icing.</p>

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