Laser Induced Formation of Superhydrophobic Silicone Rubber for Repelling Water in Water

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  • OKOSHI Masayuki
    Department of Electrical and Electronic Engineering, National Defense Academy

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  • 超撥水性シリコーンのレーザー形成と水中での機能発現
  • チョウハッスイセイ シリコーン ノ レーザー ケイセイ ト スイチュウ デ ノ キノウ ハツゲン

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Abstract

We fabricated 1 μm high and 1.5 μm diameter microswellings on a silicone rubber surface at regular 2.5 μm intervals by a 193 nm ArF excimer laser. The laser was focused on silicone rubber by each microsphere made of 2.5 μm diameter silica glass, which covered the entire surface of the silicone rubber. The surface underneath each microsphere was selectively swelled due to the photodissociation of the Si-O bonds of the silicone. The water’s contact angle was measured to be approximately 155 degrees, indicating a clear superhydrophobic property. The samples successfully repelled water in water to form an air gap layer between the silicone rubber and the water.

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