Ice nucleation at the contact line triggered by transient electrowetting fields

Yang, Fan; Shaw, R. Anthony; Gurganus, Colin; Chong, Su Kong; Yap, Yoke Khin

doi:10.1063/1.4938749

Cited by 34 publications

(41 citation statements)

References 44 publications

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“…optical observations of immersion mode nucleation on substrates. As previously demonstrated (Yang et al 2015;Gurganus, Kostinski, and Shaw 2011;Yang et al 2018;Holden et al 2019), higher frame rates than used here are imperative when the sample is immersed in water because the ice can spread to millimetre length-scales on the order of milliseconds after the nucleation event.…”

Section: Discussion and Outlookmentioning

confidence: 79%

Mapping ice formation to mineral-surface topography using a micro mixing chamber with video and atomic-force microscopy

Friddle

Thürmer

2019

Preprint

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Abstract. We developed a method for examining ice formation on solid materials under cloud-like conditions. Our experimental approach couples video-rate optical microscopy of ice formation with high-resolution atomic force microscopy (AFM) of the initial mineral surface. We demonstrate how colocating stitched AFM images with video microscopy can be used to relate the likelihood of ice formation to nanoscale properties of a mineral substrate, e.g., the abundance of surface steps of a certain height. We also discuss the potential of this setup for future iterative investigations of the properties of ice nucleation sites on materials.

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Section: Discussion and Outlookmentioning

confidence: 79%

Mapping ice formation to mineral-surface topography using a micro mixing chamber with video and atomic-force microscopy

Friddle

Thürmer

2019

Preprint

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“…More recently, some studies demonstrated the increase of freezing temperature with external applied field whereas others claimed the opposite . But one important conclusion is that the results are strongly impacted by experimental procedure . Fundamental interfacial mechanisms underlying electrofreezing are reviewed in ref.…”

Section: Resultsmentioning

confidence: 99%

“…Yang et al . measured the freezing fraction of drops deposited on glass covering a Si substrate as a function of temperature and applied voltage.…”

Section: Resultsmentioning

confidence: 99%

Impact of Surface Electrostatic Potential on Icephobic Properties of Nanoimprinted Flexible Polymer Foils

Frolet

Durret

Panabière

et al. 2018

Macro Chemistry & Physics

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Superhydrophobic surfaces have been fabricated on flexible fluorinated ethylene propylene (FEP) foils using nanoimprint lithography (NIL) and roughening by plasma etching. The combination of these two techniques results in hierarchical structures and superhydrophobic properties. The icephobic behavior of the surfaces has been studied with measurements of the freezing delay time (FDT) of water droplets on cooled surfaces. It is demonstrated in this paper that the variability of the FDT values is due to the electrostatic surface potential Vs. The impact of this parameter is explored and it is shown that the delay of freezing increases when the surface potential decreases from 0 to −500 V, and decreases for lower surface potentials. This decrease is related to the saturation effect of contact angle, which is well known in electrowetting literature. Contact angles analysis confirms that this saturation effect occurs around −500 V in the present experimental case. The effect of potential surface polarity is also discussed. By optimizing surface potentials of FEP hierarchical structures, it is possible to obtain FDT higher than 40 min at −15 °C.

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“…These correlations may be due to storm invigoration (Rosenfeld et al, 2008;Tinsley, 2012;Tinsley & Yu, 2004). For contact ice nucleation, the work of Yang et al (2015) adds to that of Abbas and Latham (1969) discussed by Tinsley and Dean (1991), suggesting that liquid shear in the strong electric fields between the charged particle and its image, at the moment of contact of a charged INP with a supercooled droplet, may further increase the efficiency and thus the amount of contact ice nucleation.…”

Section: Atmospheric Relevancementioning

confidence: 96%

Parameterization of In‐Cloud Aerosol Scavenging Due To Atmospheric Ionization: 2. Effects of Varying Particle Density

Zhang

Tinsley

2018

JGR Atmospheres

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Simulations and parameterization of collision rate coefficients for aerosol particles with 3 μm radius droplets have been extended to a range of particle densities up to 2,000 kg m−3 for midtropospheric (~5 km) conditions (540 hPa, −17°C). The increasing weight has no effect on collisions for particle radii less than 0.2 μm, but for greater radii the weight effect becomes significant and usually decreases the collision rate coefficient. When increasing size and density of particles make the fall speed of the particle relative to undisturbed air approach to that of the droplet, the effect of the particle falling away in the stagnation region ahead of the droplet becomes important, and the probability of frontside collisions can decrease to zero. Collisions on the rear side of the droplet can be enhanced as particle weight increases, and for this the weight effect tends to increase the rate coefficients. For charges on the droplet and for large particles with density ρ < 1,000 kg m−3 the predominant effect increases in rate coefficient due to the short‐range attractive image electric force. With density ρ above about 1,000 kg m−3, the stagnation region prevents particles moving close to the droplet and reduces the effect of these short‐range forces. Together with previous work, it is now possible to obtain collision rate coefficients for realistic combinations of droplet charge, particle charge, droplet radius, particle radius, particle density, and relative humidity in clouds. The parameterization allows rapid access to these values for use in cloud models.

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Ice nucleation at the contact line triggered by transient electrowetting fields

Cited by 34 publications

References 44 publications

Mapping ice formation to mineral-surface topography using a micro mixing chamber with video and atomic-force microscopy

Mapping ice formation to mineral-surface topography using a micro mixing chamber with video and atomic-force microscopy

Impact of Surface Electrostatic Potential on Icephobic Properties of Nanoimprinted Flexible Polymer Foils

Parameterization of In‐Cloud Aerosol Scavenging Due To Atmospheric Ionization: 2. Effects of Varying Particle Density

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