Temperature regulation of the contact angle of water droplets on the solid surfaces

Qi, Chonghai; Lei, Xiaoling; Zhou, Bo; Wang, Chunlei; Zheng, Yujun

doi:10.1063/1.5090529

Cited by 17 publications

(16 citation statements)

References 65 publications

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“…The adhesion and wettability of the ice layer on the superhydrophobic surface are related to the value (1 + cosθ R ). (θ R = CA-SA) When the retreat angle θ R of the droplets on the solid surface is greater than 118.2°, the adhesion of the ice layer will decrease significantly [37].…”

Section: Anti-snow and Icing Performancementioning

confidence: 99%

Multi-Scale Superhydrophobic Anti-Icing Coating for Wind Turbine Blades

Bao¹,

He²,

Chen³

et al. 2021

Energy Engineering

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As a surface functional material, super-hydrophobic coating has great application potential in wind turbine blade anti-icing, self-cleaning and drag reduction. In this study, ZnO and SiO 2 multi-scale superhydrophobic coatings with mechanical flexibility were prepared by embedding modified ZnO and SiO 2 nanoparticles in PDMS. The prepared coating has a higher static water contact angle (CA is 153°) and a lower rolling angle (SA is 3.3°), showing excellent super-hydrophobicity. Because of its excellent superhydrophobic ability and micro-nano structure, the coating has good anti-icing ability. Under the conditions of −10 C and 60% relative humidity, the coating can delay the freezing time by 1511S, which is 10.7 times slower than the normal freezing time. More importantly, due to the mechanical properties provided by SiO 2 and the synergistic effect of micro-nano particles, the coating has excellent mechanical durability. After 10 wear tests, the contact angle of the coating is still as high as 141°and the rolling angle is 6.8°. This research provides a theoretical reference for the preparation of a mechanically stable coating with a simple preparation process, as well as a basic research on the anti-icing behavior of the coating.

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Section: Anti-snow and Icing Performancementioning

confidence: 99%

Multi-Scale Superhydrophobic Anti-Icing Coating for Wind Turbine Blades

Bao¹,

He²,

Chen³

et al. 2021

Energy Engineering

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“…In the previous studies, it was found that the wettability of the solid surface was influenced by many factors, − including temperature, , coating, , salt concentrations, and so forth. However, most of them seem to be relevant to environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

“…However, there is still a lack of the microscopic structure details of water molecular arrangements on the charged solid surface with different lattice constants, such as OH bond orientations, hydrogen bond (HB) densities, atom density, and so forth. These features become extremely important in recent years. ,,, Qi suggested that temperature increases the number of HBs between the ordered water monolayer and the water droplet, which in turn enhances the hydrophilicity of the ordered water monolayer at the fcc model. Li also determined that ion hydration in the first layer can affect the wetting of the salt solution on the surface by transforming the orientation of water OH bonds and reconstructing an ordered water network.…”

Section: Introductionmentioning

confidence: 99%

Does Expanding or Contracting MgO Lattice Really Help with Corrosion Resistance of Mg Surface: Insights from Molecular Dynamics Simulations

Zhang

Wang

et al. 2021

ACS Omega

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In a humid environment, water droplets on the solid surface can act as a medium to accelerate corrosion. If the solid material has hydrophobic properties, the surface of the material will remain "clean" and corrosion may be retarded to a certain extent. In theory, MgO itself is a hydrophilic material, and we can apply additional stress or strain to change its lattice constant and adjust the wetting behavior of water on the MgO surface, resulting in changes of corrosion resistance. In order to study the effects of MgO lattice expansion or contraction on the wetting behavior of nano-water, molecular dynamics simulations have been performed in this work. It is found that the changes of the lattice constants on the MgO surface can significantly change the wetting tendency. It will alter the interaction forces between water molecules and MgO surfaces, which in turn changes the atomic density profiles, the orientation of OH bonds, and hydrogen bond networks. The contraction of MgO can actually result in the increase of wetting angles of nano-water droplets on the MgO surface and gradually exhibits hydrophobic properties.

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“…The binding properties and configuration of water molecules on the surface are modulated via van der Waals, electrostatics, charge transfer, or hydrogen bonding. , The hydrogen bonds between two or more neighboring water molecules prompt the formation of water clusters and their fattening. The formation of hydrogen bonding networks between water molecules leads to various water clustering structures, that is, an indicator reflecting the slab’s properties such as surface wettability. ,− …”

Section: Introductionmentioning

confidence: 99%

How Do Surface Defects Change Local Wettability of the Hydrophilic ZnS Surface? Insights into Sphalerite Flotation from Density Functional Theory Calculations

Sahraei

Larachi

2020

J. Phys. Chem. C

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In the flotation process, surface–reagent reactions occur on water precovered surfaces; therefore, investigation on the mineral–water interactions is essential in such systems. In the present study, the importance of surface vacancies was scrutinized by simulating water–surface complexes up to multilayer water molecules on the defective ZnS (110) surface using density functional theory. We restricted our attention to the ZnS surfaces with single sulfur, single zinc, and double neighboring congruent vacancies. Our simulation results revealed that the absence of Zn or S atoms on the surface layer has a different effect on the local surface wettability: while removing a S atom increases the hydrophobicity, removing a Zn atom increases the hydrophilicity around the defect site. The presence of double neighboring congruent vacancies further stabilized the water adsorption, whereas, by removing one Zn atom and one S atom, respectively, from surface upper and downward hills, water was dissociatively adsorbed on the ZnS surface. However, increasing the number of water molecules in a system altered the adsorption configuration and energies, indicating that considering an isolated water molecule cannot reflect the real surface circumstances at the water–surface interface. In general, in the ZnS system, surface reconstruction occurs through molecular adsorption of water on the surface by forming the Zn–O bond. Our surface analysis revealed that the level of hydrophilicity of the ZnS surface is higher when the number of undercoordinated S atoms on the surface is increased.

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Temperature regulation of the contact angle of water droplets on the solid surfaces

Cited by 17 publications

References 65 publications

Multi-Scale Superhydrophobic Anti-Icing Coating for Wind Turbine Blades

Multi-Scale Superhydrophobic Anti-Icing Coating for Wind Turbine Blades

Does Expanding or Contracting MgO Lattice Really Help with Corrosion Resistance of Mg Surface: Insights from Molecular Dynamics Simulations

How Do Surface Defects Change Local Wettability of the Hydrophilic ZnS Surface? Insights into Sphalerite Flotation from Density Functional Theory Calculations

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