Extend Plastron Longevity on Superhydrophobic Surface Using Gas Soluble and Gas Permeable Polydimethylsiloxane...

Area of Science:

• Surface science
• Materials science
• Fluid dynamics

Background:

• Gas plastrons on micro/nano-textured surfaces are vital for applications like drag reduction and anti-icing.
• Plastron longevity is limited by gas diffusion into surrounding liquids.
• Superhydrophobic surfaces rely on stable gas layers for their functionality.

Purpose of the Study:

• To investigate methods for extending the longevity of gas plastrons.
• To explore the use of gas-soluble and gas-permeable polydimethylsiloxane (PDMS) surfaces for plastron stabilization.
• To understand the mechanisms governing plastron decay and replenishment.

Main Methods:

• Experimental measurements of plastron longevity on PDMS surfaces with micro-posts and micro-holes in undersaturated liquids.
• Optical methods for real-time plastron longevity assessment.
• Numerical simulations to model gas diffusion and release from PDMS materials.

Main Results:

• Plastron longevity increased with PDMS surface thickness, indicating gas release from the polymer matrix delayed wetting.
• Thicker PDMS surfaces facilitated greater gas release, increasing local gas concentration.
• Increased pressure differences across the PDMS replenished the plastron, with injection flux exceeding diffusion flux.

Conclusions:

• PDMS surfaces offer a viable strategy to extend plastron longevity.
• Controlling gas diffusion and enabling replenishment through PDMS are key to stable plastrons.
• This research provides solutions for applications requiring persistent gas layers on surfaces.