Tunable self-jumping of melting frost on macro-patterned anisotropic superhydrophobic surfaces

Liu, Xiaolin; Chen, Huawei; Zhang, Zhao; Zhu, Yantong; Wang, Zelinlan; Chen, Jichen; Zhang, Deyuan

doi:10.1016/j.surfcoat.2021.126858

Cited by 11 publications

(5 citation statements)

References 36 publications

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“…This is similar to previous related studies. [58][59][60][61] In Fig. 8G, a drop of 5 mL of water is dropped onto the fabric surface at a voltage of 1.2 V, and its volume decreases gradually with time (Fig.…”

Section: Electro-thermal and Deicing Performance Of The Superhydropho...mentioning

confidence: 99%

A fabric-based superhydrophobic ACNTs/Cu/PDMS heater with an excellent electrothermal effect and deicing performance

Guo

2022

New J. Chem.

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Section: Electro-thermal and Deicing Performance Of The Superhydropho...mentioning

confidence: 99%

A fabric-based superhydrophobic ACNTs/Cu/PDMS heater with an excellent electrothermal effect and deicing performance

Guo

2022

New J. Chem.

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“…Because of the deformation of the droplets, the released surface energy was able to promote droplets with a large surface-to-volume ratio to roll or jump easily, which enabled the droplets to automatically detach from the surface. Under external intervention, such as changing the substrate inclination angle, , purging with wind, or using structurally designed substrates, , this effect could be enhanced. Superhydrophobic surfaces greatly promote the movement of melting droplets and even make them fall off before completely melting, which effectively keep the substrate clean.…”

Section: Introductionmentioning

confidence: 99%

Melting Process of Frozen Sessile Droplets on Superhydrophobic Surfaces

Cui,

Wang,

Che

2023

Langmuir

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Superhydrophobic surfaces can exhibit icephobicity in many ways due to their large contact angles and small rolling angles. The melting process of frozen droplets on superhydrophobic surfaces is still unclear, hindering the understanding of surface icephobicity. In this experimental study of the melting process of frozen sessile droplets on superhydrophobic surfaces, we find two types of melting morphologies with opposite vortex directions on a single-scale nanostructured (SN) superhydrophobic substrate and a hierarchical-scale micronanostructured (HMN) superhydrophobic substrate. Melting pattern visualizations and flow field measurements showed Marangoni convection and natural convection occurring in the melting sessile droplets. For the HMN superhydrophobic substrate, the internal flow was found to be dominated by Marangoni convection due to the temperature gradient along the surface of the droplet. For the SN superhydrophobic substrate, Marangoni convection was inhibited by the superhydrophobic particles at the surface of the droplet, which were shed from the fragile superhydrophobic substrate during the freezing−melting process, as confirmed by surface characterizations of the substrate and flow measurements of a water pool. These results will help researchers better understand the melting process of frozen droplets and in designing novel icephobic surfaces for numerous applications.

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“…Manipulating the surface wettability is an emerging technology for mitigating or preventing frost formation. ,− Developing icephobic surfaces that can inhibit frost accretion has been the commonly utilized methodology in this approach. − Icephobic surfaces generally possess hydrophobic (i.e., water contact angle, θ w > 90°) or superhydrophobic (i.e., θ w > 150° and roll-off angle <5°) wettability which enables low ice adhesion or an antifreezing capability by shedding the condensed water droplets before they freeze. ,, These surfaces exhibit minimal ice adhesion strength such that the accreted frozen water can be readily removed by its own weight or under the exertion of other forces such as wind shear . Further, these water-repellent surfaces exhibit relatively higher enthalpic energy for the phase transition of water (i.e., liquid water to solid ice), which can lead to a delay in frost formation and growth .…”

Section: Introductionmentioning

confidence: 99%

“…By taking advantage of both hydrophilic (or superhydrophilic) and hydrophobic (or superhydrophobic) surfaces, chemically patterned surfaces (i.e., hydrophilic domains surrounded by hydrophobic background or vice versa ) have demonstrated that they can delay frost formation and/or growth. ,, Their performance was governed by the area fraction of hydrophilic and hydrophobic domains, their spatial distribution, and the solid surface free energy (γ sv ) of each domain . Nonetheless, condensed water on these surfaces can eventually grow over time and become frost once it forms …”

Section: Introductionmentioning

confidence: 99%

Frost Delay of a Water-Absorbing Surface with Engineered Wettability via Nonfreezing Water

et al. 2022

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Frost is common when a solid surface is subjected to a humid and cold environment. It can cause various inconveniences, complications, or fatal accidents. Water-repellent surfaces have demonstrated an antifreezing capability by enabling the water droplets to roll or bounce off before they freeze. However, these surfaces are often limited by their inability to shed the small water condensates, which can eventually grow and freeze. Recently, surfaces that can rapidly absorb and hydrogen bond with these water condensates have demonstrated significant delay in frost formation and growth. This is attributed to a lower freezing temperature of the absorbed water which makes it stay in a nonfreezing state. Herein, we report a surface with preferential wettability of water over oil (i.e., superhydrophilic and oleophobic wettability) that can significantly delay frost formation. The surface is fabricated by copolymerizing poly(ethylene glycol) diacrylate (PEGDA) and perfluorinated acrylate (1H,1H,2H,2H-heptadecafluorodecyl acrylate, HDF-acrylate) applied to a silane-grafted glass substrate (HDF-PEGDA). An HDF-PEGDA surface can quickly absorb condensed water which enables it to delay frost formation and growth for up to 20 min at a surface temperature of −35 °C. Also, the surface demonstrates that its frost-resistant capability remains almost unaffected even after being submerged in an oil bath due to its in-air oil repellency. Differential scanning calorimetry (DSC) measurements reveal that the significant quantity of absorbed water in an HDF-PEGDA surface remains in a nonfreezing state with a T m value as low as −33 °C. A mathematical model that can predict the time at which the surface begins to be covered with frost is developed. Finally, an HDF-PEGDA is layered with a PEGDA copolymerized with sodium acrylate (Na-acrylate) that enables the continuous release of the absorbed water by posing forward osmotic pressure and regeneration of an HDF-PEGDA surface.

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Tunable self-jumping of melting frost on macro-patterned anisotropic superhydrophobic surfaces

Cited by 11 publications

References 36 publications

A fabric-based superhydrophobic ACNTs/Cu/PDMS heater with an excellent electrothermal effect and deicing performance

A fabric-based superhydrophobic ACNTs/Cu/PDMS heater with an excellent electrothermal effect and deicing performance

Melting Process of Frozen Sessile Droplets on Superhydrophobic Surfaces

Frost Delay of a Water-Absorbing Surface with Engineered Wettability via Nonfreezing Water

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