Icephobicities of Superhydrophobic Surfaces

Song, Dong; Jiang, Youhua; Sarshar, Mohammad Amin; Choi, Changhwan

doi:10.1002/9781119640523.ch12

Cited by 3 publications

(2 citation statements)

References 63 publications

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“…Moreover, an impacting droplet upon the superhydrophobic surfaces rebounds off the surface. The high mobility of droplets on the superhydrophobic surfaces enables the wide engineering applications including self-cleaning [13,14], anti-icing [15][16][17][18][19][20][21], and condensation enhancement [8,22,23]. However, it is difficult for the superhydrophobic surfaces to trap and split a droplet without external assistance.…”

Section: Introductionmentioning

confidence: 99%

Splitting an Impacting Droplet by a Superhydrophobic Wire

Song

et al. 2022

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Splitting a droplet into several segments is of great significance in many applications such as the detection of tiny liquid samples, whereas the surface tension tends to hold liquid to remain as one drop, causing difficulty in separating the droplet into pieces. In this work, a method is proposed to split an impacting droplet with a relatively high velocity or Weber number into two halves by a superhydrophobic wire. The effects of the wire wettability and the impact velocity of the droplet on the splitting phenomena and the efficacy to an anti-icing application are investigated. Compared to a hydrophilic wire, a superhydrophobic wire splits an impacting droplet at a relatively high speed of the Weber number greater than 3.1 and inhibits ice accretion at the temperature as low as −20 °C. The results suggest that a superhydrophobic wire can be utilized in the droplet manipulation and anti-icing applications such as power lines in high latitude areas.

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Section: Introductionmentioning

confidence: 99%

Splitting an Impacting Droplet by a Superhydrophobic Wire

Song

et al. 2022

Coatings

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“…This work offers a clue for the possible dewetting transition during the icing & melting cycle. If the droplets after melting are removed from the micro-nanostructure easily, it will effectively avoid the hazards of re-icing 32 , which is especially worthwhile in aviation applications involving multiple icing & melting cycles [33][34][35] . To achieve the easy removal of melted droplets, droplets are requested to highly recover to the CB state from the inevitable Wenzel state induced in low-temperature and high-humidity environments.…”

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confidence: 99%

Spontaneous dewetting transitions of droplets during icing & melting cycle

et al. 2022

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Anti-icing superhydrophobic surfaces have been a key research topic due to their potential application value in aviation, telecommunication, energy, etc. However, superhydrophobicity is easily lost during icing & melting cycles, where the water-repellent Cassie-Baxter state turns to the sticky Wenzel state. The reversible transition during icing & melting cycle without external assistance is challenging but vital for reliable anti-icing superhydrophobic performance, such a topic has rarely been reported. Here we demonstrate a spontaneous Wenzel to Cassie-Baxter dewetting transition during icing & melting cycle on well-designed superhydrophobic surfaces. Bubbles in ice droplets rapidly impact the micro-nano valleys under Marangoni force, prompting the continuous recovery of air pockets during melting processes. We establish models to confirm the bubbles movement broadens the dewetting conditions greatly and present three criteria for the dewetting transitions. This research deepens the understanding of wettability theory and extends the design of anti-icing superhydrophobic surfaces.

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