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Research of Two Types of Slippery Surfaces: Slippery Polydimethylsiloxane Elastomers and Polyelectrolyte Multilayers Slippery Surfaces
Liu, Yawen

2018, Master of Science, University of Akron, Polymer Engineering.
Slippery liquid-infused porous surfaces (SLIPS) are surfaces which are inspired by the Nepenthes pitcher plants and that have good ability to repel liquids such as water. They show low contact angle hysteresis and comparatively high contact angle. SLIPS has a wide range of potential application in various industries such as personal care and automobiles. In this thesis, two types of slippery surfaces based on SLIPS model are fabricated and investigated. Silicone oil infused polydimethylsiloxane (PDMS) elastomer slippery surfaces were investigated first. A facile fabrication method of slippery PDMS gel is offered in this thesis to obtain the slippery PDMS gel in a shorter time. The slippery property and longevity of slippery PDMS gels are tested by different solvents, sauce, and at different strain. Besides, the facile method of fabricating slippery and conductive PDMS gels are explored here to make functional PDMS gel for the application in endoscope. The second part in this thesis researches the water droplet impact on polyelectrolyte multilayer lubricant infused slippery surfaces fabricated by Layer-by-Layer (LbL) technique. Nano/microstructured polyelectrolyte substrates are used to lock the lubricating fluid onto the surface. 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 of 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.
Nicole Zacharia (Advisor)
Yu Zhu (Committee Chair)
Hunter King (Committee Member)
94 p.

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Liu, Y. (2018). Research of Two Types of Slippery Surfaces: Slippery Polydimethylsiloxane Elastomers and Polyelectrolyte Multilayers Slippery Surfaces. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Liu, Yawen. "Research of Two Types of Slippery Surfaces: Slippery Polydimethylsiloxane Elastomers and Polyelectrolyte Multilayers Slippery Surfaces." Electronic Thesis or Dissertation. University of Akron, 2018. OhioLINK Electronic Theses and Dissertations Center. 19 Sep 2018.

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Liu, Yawen "Research of Two Types of Slippery Surfaces: Slippery Polydimethylsiloxane Elastomers and Polyelectrolyte Multilayers Slippery Surfaces." Electronic Thesis or Dissertation. University of Akron, 2018. https://etd.ohiolink.edu/

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