Slippery liquid infused porous surface (SLIPS) are surfaces which are inspired by the <i>Nepenthes</i> pitcher plants and that have good ability to repel liquids such as water. They show low contact angle hysteresis and comparatively high contact angle. We use nano/microstructured substrates to lock the lubricating fluid onto the surface. In this work we studied the impact of water drops on our slippery surface as well as on dry, superhydrophobic surfaces. The droplet impact on superhydrophobic surfaces and SLIPS are different, and therefore by combining these two different types of surfaces we are able to create different effects of water drop impact. The effect of the viscosity of the lubricant is also studied by observing the movement of the water droplet a boundary line created by patterning a surface to include both types of water repellency (superhydrophobicity and SLIPS). One advantage to using lubricants of different viscosities is to isolate the influence of thermodynamics and dynamics between our surface and the water. We found that water droplet when dropped onto such a boundary tends to move to the SLIPS portion of the surface. The changes in water contact line are imaged with a high speed camera. The tilt of the surface was also investigated in this work. These preliminary results give some insight into how surfaces might be created that can be used to actively manipulate the motion of water drops.

Water droplet impact on slippery liquid infused porous surface (SLIPS)

254th National Meeting (2017)

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