Electrostatic cloaking of surface structure for dynamic wetting

Nita, Satoshi; Do-Quang, Minh; Wang, Jiayu; Chen, Yu-Chung; Suzuki, Yôiti; Amberg, Gustav; Shiomi, Junichiro

doi:10.1126/sciadv.1602202

Cited by 15 publications

(12 citation statements)

References 55 publications

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“…3. Unlike other studies [26][27][28][29][30], we observe an increase of CAH (from 3.1 o to 7.5 o ) as |U 0 | increases from 0 to 50 V DC . At this point, the CAH features a marked dip before growing far into the saturation regime.…”

contrasting

confidence: 99%

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Observation of contact angle hysteresis due to inhomogeneous electric fields

Wang¹,

Wang²,

Zhou³

et al. 2020

Preprint

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contrasting

confidence: 99%

“…To the best of knowledge, this electrically-induced CAH has never been observed. Moreover, most studies in electrowetting phenomena report either no effect [26][27][28] or even a reduction [29,30] of CAH due to the application of an electric voltage. These confusing observations are mainly due to three reasons.…”

mentioning

confidence: 99%

Observation of contact angle hysteresis due to inhomogeneous electric fields

Wang¹,

Wang²,

Zhou³

et al. 2020

Preprint

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“…Even though S , the ratio of wet area to projected area, has been successful in quantitatively describing the influence of the substrate roughness 36,40,42 , the mechanism by which the hindering happens has not been made clear. Also, for substrate structures that are highly asymmetric, as for instance a sawtooth shape, we would expect a direction dependence on the spreading, which cannot be captured by the simple area ratio.…”

Section: Introductionmentioning

confidence: 99%

Revealing How Topography of Surface Microstructures Alters Capillary Spreading

Lee

Matsushima

Yada

et al. 2019

Sci Rep

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Wetting phenomena, i.e. the spreading of a liquid over a dry solid surface, are important for understanding how plants and insects imbibe water and moisture and for miniaturization in chemistry and biotechnology, among other examples. They pose fundamental challenges and possibilities, especially in dynamic situations. The surface chemistry and micro-scale roughness may determine the macroscopic spreading flow. The question here is how dynamic wetting depends on the topography of the substrate, i.e. the actual geometry of the roughness elements. To this end, we have formulated a toy model that accounts for the roughness shape, which is tested against a series of spreading experiments made on asymmetric sawtooth surface structures. The spreading speed in different directions relative to the surface pattern is found to be well described by the toy model. The toy model also shows the mechanism by which the shape of the roughness together with the line friction determines the observed slowing down of the spreading.

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“…Surfaces may often be naturally charged, or electric fields may be employed to manipulate fluids, causing electric effects to be crucial components that influence wetting or dewetting phenomena. (Nita, et al, 2017). For instance, the behavior of polyelectrolyte adsorption on a substrate is dependent upon charge density, pH, temperature, and ionic strength, which has been exploited to achieve desired wettability (Yoo et al, 1998).…”

Section: Surface Charge Regulation Induced Wetting and Dewettingmentioning

confidence: 99%

Modeling of Contact Angle versus pH and Derivation of Contact Angle versus Pressure in Deep Saline Aquifers under Geological Carbon Storage

Miadonye¹,

Amadu²

2020

IJC

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Geological storage of anthropogenic carbon dioxide is regarded as a technically and economically viable strategy for mitigating carbon dioxide induced climate warming. Central to geological storage of anthropogenic carbon dioxide is the water rock interaction, which has a direct bearing on pH induced wettability evolution in saline aquifers. Consequently, understanding contact angle trend versus injected gas pressure is useful, considering its relationship to pH evolution in formation brine due to dissolved gas at prevailing temperatures and salinities. Several research works have published experimental data on contact angle versus pressure pertaining to geological conditions of anthropogenic carbon storage. In the present study, we have used thermodynamic theories relating to a surface charge model, contact angle and the classical Nernst equation to derive a logarithmic pH dependent contact angle equation. Considering the relationship between carbon dioxide solubility and pressure for a given temperature and salinity as well as the link between pH and the extent of solubility, we have plotted calculated contact angles versus corresponding pressures. Results of the plots obtained compare well with literature values. Therefore, given the lack of theoretical approach regarding contact angle versus pressure, our research work fills the knowledge gap considering the novelty in the derivation of the pH dependent contact angle equation.

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Electrostatic cloaking of surface structure for dynamic wetting

Abstract: Hindrance of dynamic wetting due to surface microstructures can be deactivated by applying electric fields.

Cited by 15 publications

References 55 publications

Observation of contact angle hysteresis due to inhomogeneous electric fields

Observation of contact angle hysteresis due to inhomogeneous electric fields

Revealing How Topography of Surface Microstructures Alters Capillary Spreading

Modeling of Contact Angle versus pH and Derivation of Contact Angle versus Pressure in Deep Saline Aquifers under Geological Carbon Storage

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