4.7 Article

Self-cleaning and bouncing behaviour of ion irradiation produced nanostructured superhydrophobic PTFE surfaces

期刊

SURFACE & COATINGS TECHNOLOGY
卷 420, 期 -, 页码 -

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2021.127331

关键词

Self-cleaning surfaces; Bouncing water drops; Superhydrophobicity; Impact dynamics; PTFE; Ion beam irradiation

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The bouncing dynamics of impacting water droplets on superhydrophobic PTFE surfaces produced by low energy ion beams were studied for self-cleaning applications. Parameters such as spreading factor, contact time, time of flight, and number of bounces were used to analyze the bouncing behavior. The results showed that the droplets on 800 eV irradiated surfaces bounced as many as 14 times.
The bouncing dynamics of impacting water droplet on low energy ion beam produced superhydrophobic PTFE surfaces was investigated for the self-cleaning application. Ion beam with 300 eV and 800 eV energies was used to produce nanostructures on PTFE surfaces having the bouncing behaviour. The bouncing dynamics of water droplet was studied using dynamics parameters like spreading factor (beta), contact time (t(c)), time of flight (t(a)) and number of bounces. The maximum spreading factor for the impact velocity of 0.5 m s(-1) and 1.0 m s(-1) was found to be 1.4 and 2.0, respectively for both 300 eV and 800 eV irradiated surfaces. The contact time of impacted droplet on 800 eV irradiated surface with 0.5 m s(-1) velocity was found to be much lower (t(c) = 13.00 ms) than 300 eV ion irradiated surface (t(c) = 19.67 ms). Post impact bouncing number as high as 14 was found for 800 eV irradiated surface. Depending on ion energy and irradiation time the surface was converted from complete wetting to complete bouncing at low impact velocity of 0.5 m s(-1) and from complete bouncing to partial bouncing at 1.0 m s(-1). The self-cleaning property on 800 eV irradiated surface was successfully demonstrated using carbon powder.

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