Theoretical Study of Dissolved Gas at a Hydrophobic Interface

Zhou, Di; Mi, Jianguo; Zhong, Chongli

doi:10.1021/jp210860d

Cited by 19 publications

(21 citation statements)

References 37 publications

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“…While wetting phenomena on structureless substrates are fairly well understood [10][11][12][13], a connection between adsorption on microscopically corrugated surfaces and the underlying intermolecular forces is still largely missing. One obvious reason for the absence of such a description is that in contrast with structureless walls, that present a one-dimensional problem [14], the two-or three-dimensional problem of rough surfaces is much more involved computationally, such that the literature involving theoretical [15][16][17][18][19][20] and simulation [21][22][23] studies is rather limited.…”

Section: Introductionmentioning

confidence: 99%

Does surface roughness amplify wetting?

Malijevský

2014

The Journal of Chemical Physics

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Any solid surface is intrinsically rough on the microscopic scale. In this paper, we study the effect of this roughness on the wetting properties of hydrophilic substrates. Macroscopic arguments, such as those leading to the well-known Wenzel's law, predict that surface roughness should amplify the wetting properties of such adsorbents. We use a fundamental measure density functional theory to demonstrate the opposite effect from roughness for microscopically corrugated surfaces, i.e., wetting is hindered. Based on three independent analyses we show that microscopic surface corrugation increases the wetting temperature or even makes the surface hydrophobic. Since for macroscopically corrugated surfaces the solid texture does indeed amplify wetting there must exist a crossover between two length-scale regimes that are distinguished by opposite response on surface roughening. This demonstrates how deceptive can be efforts to extend the thermodynamical laws beyond their macroscopic territory.

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Section: Introductionmentioning

confidence: 99%

Does surface roughness amplify wetting?

Malijevský

2014

The Journal of Chemical Physics

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“…In addition, the chemical potential equilibrium (i.e., Henry's law) imposes a dissolved gas concentration at the interface c b = Hp g > H(p 0 − p v ), with H the Henry constant, which is higher than that in the bulk liquid given by c ∞ = H(p 0 − p v ) for a saturated solution (i.e., equilibrium with a flat interface). Nuclei equilibrium and nucleation in wide crevices, therefore, require gas supersaturation close to the interface, which could be induced in our experiments through gas adsorption onto hydrophobic defects [25,26].…”

Section: Narrow and Wide Crevices As Nucleation Sitesmentioning

confidence: 99%

“…On the other hand, vapor bubble cannot nucleate in wide crevices since no mechanical equilibrium exists [20,21]. Yet, in presence of dissolved gas, molecule of gas can adsorb on hydrophobic surfaces [22,23], resulting in a local gas supersaturation required for nuclei equilibrium [20] and nucleation [24,25] in wide crevices. Nucleated gas bubble can then grow by diffusion from the surface adsorbed gas layer to the bubble [26].…”

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confidence: 99%

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Cavitation Nuclei Regeneration in a Water-Particle Suspension

Bussonnière

Tsai

2020

Phys. Rev. Lett.

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Bubble nucleation in water induced by boiling, gas supersaturation or cavitation usually originates from pre-existing gas cavities trapped into solid defects. Even though the destabilization of such gas pockets, called nuclei, has been extensively studied, little is known on the nuclei dynamic. Here, nuclei of water-particle suspensions are excited by acoustic cavitation, and their dynamic is investigated by monitoring the cavitation probability over several thousand pulses. A stable and reproducible cavitation probability emerges after a few thousand pulses and depends on particle concentration, hydrophobicity, and dissolved gas content. Our observations indicate that a stable nuclei distribution is reached at a later-time, different from previously reported nuclei depletion in early-time. This apparent paradox is elucidated by varying the excitation rate, where the cavitation activity increases with the repetition period, indicating that the nuclei depletion is balanced by spontaneous nucleation or growth of nuclei. A model of this self-supporting generation of nuclei suggests an origin from dissolved gas adsorption on surfaces. The method developed can be utilized to further understand the spontaneous formation and distribution of nano-sized bubbles on heterogeneous surfaces.

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“…In general, wetting refers to the extent by which a liquid wets a solid in a gaseous medium . The possibility of switching the roles of liquid and gaseous media results in what is termed as bubble wetting, where an air bubble either makes intimate contact with a solid immersed in a liquid medium (aerophilic) or will show less adherence with high bubble contact angle (BCA) (aerophobic); analogous to water droplet on hydrophilic or hydrophobic surface respectively . Interestingly, natural aquatic organisms particularly Potamodytes tuberosus, water fern Salvinia, scaled fishes are an epitome of indigenous organic surfaces harnessing the merits of superaerophilicity and superaerophobicity .…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Fabricating Superaerophobic and Superaerophilic Surfaces

George

Chidangil

George

2017

Adv Materials Inter

104

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In spite of large amount of research in fabricating surfaces of varying wettability by biomimicking the naturally occurring surfaces, the work on fundamentally and industrially important air bubble adhesion on solid surfaces and its applications are still in the burgeoning stage. The present progress report provides a discussion and a critical evaluation of the recent literature available on the fabrication of superaerophilic/superaerophobic surfaces via synergic modification of surface topography and surface chemistry. An abridge on the physics behind bubble wetting on a solid in a liquid medium is deciphered here, considering the interfacial surface tension balance at the three‐phase contact line, Laplace pressure, hydrostatic pressure, and surface forces, respectively. Emphasis is made on the advancement in micro/nanofabrication technologies to fabricate surfaces that break the conventional wisdom of complementary behavior of water and air bubble contact angles. The progress report presented here also shines light on the mechanism of air bubble dynamics on solid surfaces and the latest developments in achieving surfaces of varied air bubble adhesion and its applications. Finally, the prospects of the superaerophobic and superaerophilic surfaces in the near future together with the challenges faced in accomplishing them are also insinuated.

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Theoretical Study of Dissolved Gas at a Hydrophobic Interface

Cited by 19 publications

References 37 publications

Does surface roughness amplify wetting?

Does surface roughness amplify wetting?

Cavitation Nuclei Regeneration in a Water-Particle Suspension

Recent Progress in Fabricating Superaerophobic and Superaerophilic Surfaces

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