Sliding of water droplets on micropillar-structured superhydrophobic surfaces

Yao, Chun-Wei; Tang, Sirui; Sebastian, Divine; Tadmor, Rafael

doi:10.1016/j.apsusc.2019.144493

Cited by 40 publications

(20 citation statements)

References 39 publications

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“…DMSO demonstrated distinct Cassie-like wetting on the fluorinated "urchin"-like surfaces. Thus, the introduced hierarchical surfaces demonstrate high apparent contact angles, low contact angle hysteresis and high stability of the Cassie wetting state 19,48 .…”

Section: Discussionmentioning

confidence: 96%

Robust icephobic coating based on the spiky fluorinated Al2O3 particles

Starostin

Стрельников

Вальцифер

et al. 2021

Sci Rep

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Omniphobic and icephobic twin-scale surfaces based on the “urchin”-like fluorinated Al2O3 particles are presented. Combined effect of hierarchical topography and fluorination supplied to the surfaces omniphobic and icephobic properties. The study of the stability of the Cassie wetting state is reported. High apparent contact angles were accompanied with the low contact angle hysteresis and high stability of the Cassie air trapping wetting state. Time delay of the ice crystallization as high as $$88\pm 5$$ 88 ± 5 min was established when compared to the ice formation on flat aluminum and non-fluorinated “urchin”-like surfaces. Crystallized water droplets formed on the reported nano-structured surfaces were easily blown out by the air jet with the velocity of $$v=3.0\pm 1.0$$ v = 3.0 ± 1.0 m/s, (which is markedly lower than that common for exploitation of aircrafts and turbines). Heated “urchin”-like surfaces completely restored their omniphobic and icephobic surfaces after thawing. Qualitative analysis of water freezing is supplied.

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Section: Discussionmentioning

confidence: 96%

Robust icephobic coating based on the spiky fluorinated Al2O3 particles

Starostin

Стрельников

Вальцифер

et al. 2021

Sci Rep

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“…The minimum measurement angle of the MEMS liquid inclinometer sensor is mainly determined by the sliding angle of the metal droplet [12]. In order to further reduce the sliding angle of the droplet, researchers have proposed a method for growing microstructures on the surface of the substrate, which has increased the surface roughness of the substrate and reduced the contact area of the droplet and the surface [21,22]. Lv manufactured an array of micro-cubes to create a super hydrophobic surface when predicting the sliding angle of a droplet on a micro-structured surface.…”

Section: Design Of the Superhydrophobic Structure On Lower Structurementioning

confidence: 99%

A Capacitive MEMS Inclinometer Sensor with Wide Dynamic Range and Improved Sensitivity

Zhao

Zhang

et al. 2020

Sensors

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This paper proposes a novel capacitive liquid metal microelectromechanical system (MEMS) inclinometer sensor and introduces its design, fabrication, and signal measurement. The sensor was constructed using three-layer substrates. A conductive liquid droplet was rolled along an annular groove of the intermediate substrate to reflect angular displacement, and capacitors were used to detect the position of the droplet. The numerical simulation work provides the working principle and structural design of the sensor, and the fabrication process of the sensor was proposed. Furthermore, the static capacitance test and the dynamic signal test were designed. The sensor had a wide measurement range from ±2.12° to ±360°, and the resolution of the sensor was 0.4°. This sensor further expands the measurement range of the previous liquid droplet MEMS inclinometer sensors.

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“…[31][32][33][34][35][36] Miwa et al reported an inverse relationship between the static contact and sliding angles with an increase in the static contact angle of a droplet being associated with a decrease in the sliding angle 37 and several investigators have conducted related theoretical studies of various surface morphologies. [38][39][40][41][42][43] The motion of a water droplet on a solid surface is governed by the movement of the threephase liquid-vapor-solid contact line. With this in mind, Yoshimitsu et al reported that it is important to design a surface with respect to the shape and movement of the contact line when they investigated the sliding angle of water droplets on hydrophobic surfaces with grooved and pillared structures.…”

Section: Introductionmentioning

confidence: 99%

Influence of Gravity on the Sliding Angle of Water Drops on Nanopillared Superhydrophobic Surfaces

Yan

Fichthorn

2020

Langmuir

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Molecular dynamics (MD) simulations were used to study the effects of gravity, solid surface energy, and fraction of water-solid interface area on water droplet sliding angles on nanopillared surfaces. To effectively simulate the influence of gravity on drop sliding, we developed a protocol in which we scale the value of gravitational acceleration used in our simulations according to the Bond number (Bo). In this way, we approximate the behavior of 2 larger drops than we can effectively simulate using MD. The sliding angle decreased with an increase in Bo, while increasing with an increase in the liquid-solid surface interaction. The sliding angles exhibit a minimum with an increase in the fraction of water-solid interface area, due to meniscus formation at high fractions. Trends predicted by our model are in agreement with experiment. Using our model, we investigated the mechanisms of droplet movement along nanopillared surfaces. Depending on the pinning state of the droplets at equilibrium, either the advancing or receding contact angle initiates motion. Moreover, the minimum dynamic advancing and receding contact angles of drops with gravity are close to the static contact angle and the intrinsic contact angle, respectively, while the maximum of both angles are as large as 180°. We find that the drops move through a combination of sliding and rolling, in agreement with experiment. Our studies offer clarity to conflicting experimental reports and present new results awaiting experimental confirmation.

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Sliding of water droplets on micropillar-structured superhydrophobic surfaces

Cited by 40 publications

References 39 publications

Robust icephobic coating based on the spiky fluorinated Al2O3 particles

Robust icephobic coating based on the spiky fluorinated Al2O3 particles

A Capacitive MEMS Inclinometer Sensor with Wide Dynamic Range and Improved Sensitivity

Influence of Gravity on the Sliding Angle of Water Drops on Nanopillared Superhydrophobic Surfaces

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