Dynamic behaviors and self-cleaning property of droplet on superhydrophobic coating in uniform DC electric field

Ren, Shuai; Wang, Shengwu; Dong, Zhenqiu; Chen, Junwu; Li, Lee

doi:10.1016/j.colsurfa.2021.127056

Cited by 15 publications

(12 citation statements)

References 20 publications

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“…Controlling the directional transport of droplets on a solid surface is crucial in applications such as self-cleaning, , water collection, thermal management, chemical reactions, , and biomedicine. − The main ways to control droplet transport are heterogeneous surface drive and external forces such as electric and magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Droplet Rolling Transport on Hydrophobic Surfaces Under Rotating Electric Fields: A Molecular Dynamics Study

Liu,

Jing

2023

Langmuir

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Driving droplets by electric fields is usually achieved by controlling their wettability, and realizing a flexible operation requires complex electrode designs. Here, we show by molecular dynamics methods the droplet transport on hydrophobic surfaces in a rolling manner under a rotating electric field, which provides a simpler and promising way to manipulate droplets. The droplet internal velocity field shows the rolling mode. When the contact angle on the solid surface is 144.4°, the droplet can be transported steadily at a high velocity under the rotating electric field (E = 0.5 V nm −1 , ω = π/20 ps −1 ). The droplet center-of-mass velocities and trajectories, deformation degrees, dynamic contact angles, and surface energies were analyzed regarding the electric field strength and rotational angular frequency. Droplet transport with a complex trajectory on a two-dimensional surface is achieved by setting the electric field, which reflects the programmability of the driving method. Nonuniform wettability stripes can assist in controlling droplet trajectories. The droplet transport on the three-dimensional surface is studied, and the critical conditions for the droplet passing through the surface corners and the motion law on the curved surface are obtained. Droplet coalescence has been achieved by surface designs.

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Section: Introductionmentioning

confidence: 99%

“…A mild temperature difference can cause droplets to self-propel on a smooth and homogeneous single crystal surface because thermoelastic–piezoelectric interactions can produce intricate electric potential profiles . Additionally, a uniform DC electric field can drive charged droplets on a superhydrophobic surface …”

Section: Introductionmentioning

confidence: 99%

Droplet Rolling Transport on Hydrophobic Surfaces Under Rotating Electric Fields: A Molecular Dynamics Study

Liu,

Jing

2023

Langmuir

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“…For example, ultrasonic waves [27], directional winds [28], and dip angles [29,30] have been used so that water droplets on a surface experience a force, and directional movement occurs along the direction of the force. At the same time, temperature [31][32][33], pressure [34], and light intensity [35] gradients have also been studied to induce a change in water droplets on a superhydrophobic surface from the Wenzel state to the Cassie state. Then, the unstable water droplets on the surface fall off with the help of the inclination angle, thereby realizing self-cleaning.…”

Section: Introductionmentioning

confidence: 99%

Self-cleaning of superhydrophobic nanostructured surfaces at low humidity enhanced by vertical electric field

et al. 2022

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Self-cleaning is the key factor that makes superhydrophobic nanostructured materials have wide applications. The self-cleaning effect, however, strongly depends on formations and movement of water droplets on superhydrophobic nanostructured surfaces, which is greatly restricted at low humidity (< 7.6 g•kg −1 ). Therefore, we propose a self-cleaning method at low humidity in which the pollution is electro-aggregated and driven in the electric field to achieve the aggregation and cleaning large areas. The cleaning efficiency of this method is much higher than that of water droplet roll-off, and will not produce " pollution bands" . A simplified numerical model describing pollution movements is presented. Simulation results are consistent with experimental results. The proposed method realizes the self-cleaning of superhydrophobic nanostructured surfaces above dew point curve for the first time, which extends applications of superhydrophobic nanostructured materials in low humidity, and is expected to solve self-cleaning problems of outdoor objects in low humidity areas (< 5.0 g•kg −1 ).

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“…A novel triboelectric wetting (TEW) method allows programmed and precise water droplet control using frictional charges directly . The electric field strength has an important effect on the rolling self-cleaning performance of charged droplets on superhydrophobic surfaces . Regulating the thermoelastic–piezoelectric interactions at the solid–liquid interface through anisotropic crystal structures generates complex potential distributions, which can realize various forms of droplet self-propulsion .…”

mentioning

confidence: 99%

“…30 The electric field strength has an important effect on the rolling self-cleaning performance of charged droplets on superhydrophobic surfaces. 31 Regulating the thermoelastic− piezoelectric interactions at the solid−liquid interface through anisotropic crystal structures generates complex potential distributions, which can realize various forms of droplet selfpropulsion. 32 Electrodewetting can be achieved by the electric field-induced adsorption of ionic surfactants onto hydrophilic surfaces.…”

mentioning

confidence: 99%

Transforming Droplets into Liquid Films in Nanochannels under Rotating Electric Fields Studied by Molecular Dynamics

Liu

Jing

2023

J. Phys. Chem. Lett.

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It is first proposed to use a rotating electric field to stretch a droplet into a liquid film pinned to the insulated channel inner wall as a new type of active liquid valve. The molecular dynamics (MD) simulations are performed to prove that droplets in nanochannels can be stretched and expanded into closed liquid films under the action of rotating electric fields. The variations of the liquid cross-sectional area and droplet surface energy with time are calculated. The liquid film formation occurs mainly through two modes: gradual expansion and liquid column rotation. In most cases, increasing the electric field strength and angular frequency favors liquid film closing. At higher angular frequencies, decreasing the angular interval favors liquid film closing. The opposite is true at lower angular frequencies. The process of closing the hole-containing liquid film, which has formed a dynamic equilibrium, is a surface energy increase process, which requires greater electric field strength and angular frequency.

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Dynamic behaviors and self-cleaning property of droplet on superhydrophobic coating in uniform DC electric field

Cited by 15 publications

References 20 publications

Droplet Rolling Transport on Hydrophobic Surfaces Under Rotating Electric Fields: A Molecular Dynamics Study

Droplet Rolling Transport on Hydrophobic Surfaces Under Rotating Electric Fields: A Molecular Dynamics Study

Self-cleaning of superhydrophobic nanostructured surfaces at low humidity enhanced by vertical electric field

Transforming Droplets into Liquid Films in Nanochannels under Rotating Electric Fields Studied by Molecular Dynamics

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