Dynamic spreading of a water nanodroplet on a nanostructured surface in the presence of an electric field

Zhang, Ben-Xi; Wang, Shuo-Lin; He, Xin; Yang, Yan‐Ru; Wang, Xiaodong

doi:10.1016/j.molliq.2021.116039

Cited by 14 publications

(7 citation statements)

References 42 publications

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“…As E increases, the droplet enters the square column gap and touches the solid bottom to exhibit the Wenzel state. 38 This is attributed to the electric field promoting the pinning effect, 39 thereby enhancing the electrical stretching effect.…”

Section: Resultsmentioning

confidence: 99%

Dynamical behaviors of nanodroplets impinging on solid surfaces in the presence of electric fields

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Dynamical behaviors of nanodroplets impinging on solid surfaces in the presence of electric fields

et al. 2023

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“…At saturation, the electric field becomes high enough to cause the water molecules at the contact line to get ejected, and this precludes further spreading. In addition to this, unaccounted molecular-scale effects like the local number of hydrogen bonds, , which is impacted by the direction of the field, , affect the final configuration of the droplet. The interfacial tension between the solid and liquid is impacted by the change in the number of hydrogen bonds , at the interface.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to this, unaccounted molecular-scale effects like the local number of hydrogen bonds, , which is impacted by the direction of the field, , affect the final configuration of the droplet. The interfacial tension between the solid and liquid is impacted by the change in the number of hydrogen bonds , at the interface. This change may result in asymmetry in the droplet shape and deviation from the contact angle predicted using the Young–Lippmann equation.…”

Section: Introductionmentioning

confidence: 99%

Molecular Investigation of the Actuation of Electrowetted Nanodroplets

2022

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It is well known that the wettability of a droplet on a solid substrate can be modified by the application of an electric field. The phenomenon of electrowetting along with the associated physics of droplet shape change and dynamics has traditionally been studied at the micro-scale leading to exciting applications. The present work is undertaken to explore the physics of electrowetting actuation of droplet movement at the molecular level. Molecular simulations are performed to obtain the dynamic spreading of the droplet under the action of a radially symmetric electric field on a silica substrate. The dynamic behavior of the contact diameter is found to be qualitatively similar to that observed at the laboratory scale. Further simulations of droplet actuation across an array of electrodes illustrated the dynamics of the center of mass, which is then used to estimate the contact line friction and compared with the predictions from a reduced-order model. A scaling analysis is used to probe the physics of the problem correlating the contact line friction coefficient and the droplet velocity after actuation. The results and understanding elicited from the fundamental approach have the potential to guide the development of quick and precise control of nano-sized droplets and may prove to be pivotal in the development of future nanofluidic systems, nanomanufacturing methodologies, and high-resolution optoelectronic devices.

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“…[55] Zhang et al investigated the wetting dynamics of nanodroplets on nanostructured surface in the presence of vertical electric field. [56] Kumar et al studied the effect of external electric field on the structural and dynamic properties of sessile ionic nanodroplets. [57] Chan et al investigated the behavior of water nanodroplets on hydrophobic surfaces under applied electric field.…”

Section: Introductionmentioning

confidence: 99%

Confinement Dynamics of Nanodroplets between Two Surfaces: Effects of Wettability and Electric Field

et al. 2022

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The electrowetting effect and related applications of tiny droplets have aroused widespread research interest. In this work, we report molecular dynamics simulations of confinement dynamics of nanodroplets under different droplet-surface interactions and surface distances under an external electric field. So far, the effect of the surface-droplet interactions on electric field-induced dynamics behaviors of droplets in confined spaces has not been extensively studied. Our results show that in the absence of electric field there is a critical value of surface wettability for the shape transition of droplets. Above this value, the droplet is divided into small droplets adhered on the bottom and top surfaces; below this value, the droplets are detached from the surfaces. When an external electric field is applied parallel to the surfaces, the droplet spreads on the surface along the direction of the electric field. It was found that the surface separation significantly influences the transition of the droplet shape. The steady morphology of the droplets under the electric field depends on the surface-droplet interaction and surface separation. We explore the underlying mechanism causing the morphological transition through analyzing the molecular interactions, the number of interracial molecules and the interaction force between the droplets and surfaces. These results provide basic insights into the molecular interactions of nanodroplets under different confined environments, and clues for applications of confined nanodroplets under the control of electric field.

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Dynamic spreading of a water nanodroplet on a nanostructured surface in the presence of an electric field

Cited by 14 publications

References 42 publications

Dynamical behaviors of nanodroplets impinging on solid surfaces in the presence of electric fields

Dynamical behaviors of nanodroplets impinging on solid surfaces in the presence of electric fields

Molecular Investigation of the Actuation of Electrowetted Nanodroplets

Confinement Dynamics of Nanodroplets between Two Surfaces: Effects of Wettability and Electric Field

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