Comments on the Energy Barrier Calculations during “Stick–Slip” Behavior of Evaporating Droplets Containing Nanoparticles

Oksuz, Melik; Erbil, H. Yıldırım

doi:10.1021/jp5010083

Cited by 23 publications

(25 citation statements)

References 45 publications

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“…"Stick-slip" droplet motion on surfaces was also observed during droplet evaporations on some substrates and for droplets containing colloidal nanosuspensions [75]. For the second case, the nanoparticles present in a droplet cause the self-pinning of the threephase contact line, and concentric rings are formed on the substrate afterwards [76][77][78][79]. Initially, the contact angle and height of the droplet decreases during the "stick" (pinning) phase with a constant contact radius as the droplet evaporates.…”

Section: Stick-slip Phenomenon Of Drops On Solidsmentioning

confidence: 91%

“…The pinning effect was attributed to a potential energy barrier per unit length of the triple line in a model where the spherical cap geometry was assumed and line tension was neglected [76][77][78]. Later, eight slightly modified new equations in two sets were derived in order to remove the inconsistent calculation results of the potential energy barriers for the practical stick-slip droplet motion cases [79].…”

Section: Stick-slip Phenomenon Of Drops On Solidsmentioning

confidence: 99%

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Dependency of Contact Angles on Three-Phase Contact Line: A Review

Erbil

2021

Colloids and Interfaces

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The wetted area of a sessile droplet on a practical substrate is limited by the three-phase contact line and characterized by contact angle, contact radius and drop height. Although, contact angles of droplets have been studied for more than two hundred years, there are still some unanswered questions. In the last two decades, it was experimentally proven that the advancing and receding contact angles, and the contact angle hysteresis of rough and chemically heterogeneous surfaces, are determined by interactions of the liquid and the solid at the three-phase contact line alone, and the interfacial area within the contact perimeter is irrelevant. However, confusion and misunderstanding still exist in this field regarding the relationship between contact angle and surface roughness and chemical heterogeneity. An extensive review was published on the debate for the dependence of apparent contact angles on drop contact area or the three-phase contact line in 2014. Following this old review, several new articles were published on the same subject. This article presents a review of the novel articles (mostly published after 2014 to present) on the dependency of contact angles on the three-phase contact line, after a short summary is given for this long-lasting debate. Recently, some improvements have been made; for example, a relationship of the apparent contact angle with the properties of the three-phase line was obtained by replacing the solid–vapor interfacial tension term, γSV, with a string tension term containing the edge energy, γSLV, and curvature of the triple contact line, km, terms. In addition, a novel Gibbsian thermodynamics composite system was developed for a liquid drop resting on a heterogeneous multiphase and also on a homogeneous rough solid substrate at equilibrium conditions, and this approach led to the same conclusions given above. Moreover, some publications on the line energy concept along the three-phase contact line, and on the “modified” Cassie equations were also examined in this review.

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Section: Stick-slip Phenomenon Of Drops On Solidsmentioning

confidence: 91%

Section: Stick-slip Phenomenon Of Drops On Solidsmentioning

confidence: 99%

Dependency of Contact Angles on Three-Phase Contact Line: A Review

Erbil

2021

Colloids and Interfaces

Self Cite

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“…Right before the droplet boundary depins, Δ g shows the maximal value and this value is referred to as the pinning energy barrier. [ 90,92,94,95 ] The greater value of the pinning energy barrier represents a higher droplet retention on the surface. Equations ()–() are based on the assumption of the spherical cap shape of a droplet.…”

Section: Background Of Wetting and Retentionmentioning

confidence: 99%

Droplet Retention on Superhydrophobic Surfaces: A Critical Review

Jiang

Choi

2020

Adv Materials Inter

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Wetting phenomena and superhydrophobic surfaces are ubiquitous in nature and have recently been explored widely in scientific and engineering applications. The understanding and control of surface superhydrophobicity are not only fundamentally intriguing but also practically important to provide unique and regulated functionalities to natural species and industrial applications. Here, the fundamentals of wetting phenomena are critically reviewed that especially apply to superhydrophobicity, putting an emphasis on the clarification of contact angles, the quantification of droplet retention force, and the role of contact line. The fundamentals of how the droplet retention is determined by the surface features are discussed and advanced analytical models for the prediction of contact angles and retentive forces are introduced. Applications are further discussed whose functionalities largely depend on the droplet retention, including directional droplet transport, anti‐icing, and water harvesting.

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“…Several reports have been dedicated to the discussion of protocols for reproducible measurements of the advancing and receding CAs . For surfaces with large heterogeneity scale, the pinning of contact line causes the droplet to move in a stick‐slip manner . Not only does the stick‐slip behavior tends to deform the droplet shape, but the transition time between the droplet motion is often too fast for reliable dynamic CA evaluation .…”

Section: Definition Of Surface Wettability: Beyond General Classificamentioning

confidence: 99%

Assessment and Interpretation of Surface Wettability Based on Sessile Droplet Contact Angle Measurement: Challenges and Opportunities

Kung

Sow

Zahiri

et al. 2019

Adv Materials Inter

119

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www.advmatinterfaces.de the sessile CA remains the favored method for quantifying wettability, mostly due to its conceptual and measurement simplicity. [9,31] However, the classification on the basis of the cut-off CA of 90° has attracted criticism. [32,33] The simplistic evaluation criteria of relative wettability are becoming inadequate in satisfying the needs of superwettability studies to classify different wetting phenomena. [34] Several works have questioned the accuracy of the sessile-droplet measurement as the CA value approaches the limits of 0° or 180°. [35,36] Yet, evaluation of surfaces in the superhydrophobic (CA > 150°) and superhydrophilic (CA < 10°) regimes is central in the development of enhanced wettabilities. Moreover, the interpretation of the CA results is often complicated by several factors, including surface smoothness, heterogeneity and cleanliness. [37] The Chun Haow Kung obtained his B.A.Sc. and M.A.Sc. in Chemical Engineering at the University of British Columbia (UBC). His graduate work with Prof. Mérida's group at UBC focused on the development and application of novel wetting characterization techniques, smart stimuli-responsive materials as well as electrochemical and hydrogen energy systems. He is currently a Research Scientist at Ballard Power Systems Inc. where he continues to pursue his interest in the polymer electrolyte membrane (PEM) fuel cell technology. Beniamin Zahiri is currently a researcher in the University of Illinois at Urbana-Champaign

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Comments on the Energy Barrier Calculations during “Stick–Slip” Behavior of Evaporating Droplets Containing Nanoparticles

Cited by 23 publications

References 45 publications

Dependency of Contact Angles on Three-Phase Contact Line: A Review

Dependency of Contact Angles on Three-Phase Contact Line: A Review

Droplet Retention on Superhydrophobic Surfaces: A Critical Review

Assessment and Interpretation of Surface Wettability Based on Sessile Droplet Contact Angle Measurement: Challenges and Opportunities

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