Spreading Dynamics of Droplet Impact on a Wedge-Patterned Biphilic Surface

Yang, Yongbin; Chen, Xiaoqian; Huang, Yiyong

doi:10.3390/app9112214

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…A critical challenge to hybrid surface implementation is the lack of fabrication scalability. In contrast to scalable homogeneous functional surfaces, conventional hybrid surface fabrication processes, such as mask-based lithography, ,, mesh screen and diffusion welding, inkjet printing, , laser processing, and a direct combination or stacking of materials with distinct wettabilities, , are not always scalable. Furthermore, these methods can be substrate-dependent, can require specialized equipment, and can suffer from extended fabrication times.…”

Section: Introductionmentioning

confidence: 99%

Defect-Density-Controlled Phase-Change Phenomena

Hoque

Yan

Qiu

et al. 2023

ACS Appl. Mater. Interfaces

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Juxtaposing hydrophilicity and hydrophobicity on the same surface, known as hybrid surface engineering, can enhance phasechange heat transfer. However, controlling hydrophilicity on hybrid surfaces in a scalable fashion is a challenge, limiting their application. Here, using widely available metal meshes with variable dimensions and by controlling the patterning pressure, we scalably fabricate hybrid surfaces having spot and gridlike patterns using stamping. Using fog harvesting in a controlled chamber, we show that optimized hybrid surfaces have a ∼37% higher fog harvesting rate when compared to homogeneous superhydrophobic surfaces. Furthermore, condensation frosting experiments reveal that, on grid-patterned hybrid surfaces, frost propagates at ∼160% higher velocity and provides ∼20% less frost coverage when compared to homogeneous superhydrophobic surfaces. During defrost, our hybrid surfaces retain more water when compared to superhydrophobic surfaces due to the presence of hydrophilic patterns and melt water pinning. We adapt our fabrication technique to roll-to-roll patterning, demonstrating wettability contrast on round metallic geometries via atmospheric water vapor condensation. This work provides guidelines for the rapid, substrate-independent, and scalable fabrication of hybrid wettability surfaces for a wide variety of applications.

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Section: Introductionmentioning

confidence: 99%

Defect-Density-Controlled Phase-Change Phenomena

Hoque

Yan

Qiu

et al. 2023

ACS Appl. Mater. Interfaces

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“…Significant challenges remain related to the manufacture of hybrid patterns on large area samples. Unlike scalable homogeneous functional surfaces, past hybrid surface fabrication processes, typically involving conventional mask-based lithography with selective removal of the background material, ,, direct-patterning by inkjet printing, , laser processing, and a direct combination or stacking of materials with distinct wettabilities , have not focused on scalabilty. All of the aforementioned techniques are substrate dependent, are not scalable (∼cm), and suffer from long fabrication times (∼hours).…”

Section: Introductionmentioning

confidence: 99%

High-Throughput Stamping of Hybrid Functional Surfaces

et al. 2020

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Hydrophobic–hydrophilic hybrid surfaces, sometimes termed biphilic surfaces, have shown potential to enhance condensation and boiling heat transfer, anti-icing, and fog harvesting performance. However, state of art techniques to develop these surfaces have limited substrate selection, poor scalability, and lengthy and costly fabrication methods. Here, we develop a simple, scalable, and rapid stamping technique for hybrid surfaces with spatially controlled wettability. To enable stamping, rationally designed and prefabricated polydimethylsiloxane (PDMS) stamps, which are reusable and independent of the substrate and functional coating, were used. To demonstrate the stamping technique, we used silicon wafer, copper, and aluminum substrates functionalized with a variety of hydrophobic chemistries including heptadecafluorodecyltrimethoxy-silane, octafluorocyclobutane, and slippery omniphobic covalently attached liquids. Condensation experiments and microgoniometric characterization demonstrated that the stamped surfaces have global hydrophobicity or superhydrophobicity with localized hydrophilicity (spots) enabled by local removal of the functional coating during stamping. Stamped surfaces with superhydrophobic backgrounds and hydrophilic spots demonstrated stable coalescence induced droplet jumping. Compared to conventional techniques, our stamping method has comparable prototyping cost with reduced manufacturing time scale and cost. Our work not only presents design guidelines for the development of scalable hybrid surfaces for the study of phase change phenomena, it develops a scalable and rapid stamping protocol for the cost-effective manufacture of next-generation hybrid wettability surfaces.

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