Recent progress in experiments for sessile droplet wetting on structured surfaces

Ren, Junheng; Duan, Fei

doi:10.1016/j.cocis.2021.101425

Cited by 10 publications

(5 citation statements)

References 93 publications

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“…Evaporation of a droplet on a surface is a fundamental phenomenon and crucially important for numerous applications ranging from the macroscale to nanoscale: thermal management, spray cooling, inkjet printing, and DNA chips, etc. − For over a century, researchers have developed many theoretical models, simulations, and experimental studies − to describe the evaporation behavior, e.g., the evolution of droplet volume, contact angle, contact radius, evaporation duration, etc., during the droplet evaporation. Due to the coupled internal liquid motion, heat transfer between three phases (solid–liquid–gas), and mass flux of the vapor phase, the sessile droplet evaporation is a complex and nonequilibrium problem.…”

Section: Introductionmentioning

confidence: 99%

Droplet Evaporation Dynamics on Hydrophobic Network Surfaces

Yang

Mei

et al. 2022

Langmuir

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Surface modification, such as hydrophobic network modification, is very promising technology to control droplet dynamics, heat transfer, and evaporation. However, fundamental mechanisms of how these chemically patterned surfaces affect the droplet evaporation dynamics and predictions of evaporation rates are still lacking. In the present work, we systematically investigated the full process of droplet evaporation dynamics on hydrophobic network surfaces and distinguished four different stages: constant contact line (CCL) stage, constant contact angle (CCA) stage, pattern-pinning (PP) stage, and moving contact line (MCL) stage. We further developed a general model considering the pinning and depinning forces to accurately predict the evaporation transition from PP to MCL stages (i.e., critical receding contact angle, θ cr ). As for the influence of the chemically patterned surface on the evaporation rate, a corrected contact line length was considered and combined with the well-known Rowan and Erbil's models. Finally, a general model was thus proposed and showed successful predictions for the evaporation durations of each stage.

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Section: Introductionmentioning

confidence: 99%

Droplet Evaporation Dynamics on Hydrophobic Network Surfaces

Yang

Mei

et al. 2022

Langmuir

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“…Recent experiments from 2019 to 2021 for sessile droplet wetting on structured surface have been overviewed in ref. [139]. A main conclusion here is that most experiments show a 2D view of the wetting morphology and that the apparent contact angle should be measured in 3D with sectional views in different directions.…”

Section: Cassie–wenzel Theory and Its Limitationmentioning

confidence: 94%

“…In addition, the evaporation and condensation effects on the wetting on patterned substrates are discussed in ref. [139] for the formation of irregular droplet shape and non‐circular three‐phase contact line. For the effect of evaporation and condensation to the wetting phenomenon on patterned substrate, we refer to refs.…”

Section: Cassie–wenzel Theory and Its Limitationmentioning

confidence: 99%

Wetting Effect on Patterned Substrates

Wang

Nestler

2023

Advanced Materials

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A droplet deposited on a solid substrate leads to the wetting phenomenon. A natural observation is the lotus effect, known for its superhydrophobicity. This special feature is engendered by the structured microstructure of the lotus leaf, namely, surface heterogeneity, as explained by the quintessential Cassie-Wenzel theory (CWT). In this work, recent designs of functional substrates are overviewed based on the CWT via manipulating the contact area between the liquid and the solid substrate as well as the intrinsic Young's contact angle. Moreover, the limitation of the CWT is discussed. When the droplet size is comparable to the surface heterogeneity, anisotropic wetting morphology often appears, which is beyond the scope of the Cassie-Wenzel work. In this case, several recent studies addressing the anisotropic wetting effect on chemically and mechanically patterned substrates are elucidated. Surface designs for anisotropic wetting morphologies are summarized with respect to the shape and the arrangement of the surface heterogeneity, the droplet volume, the deposition position of the droplet, as well as the mean curvature of the surface heterogeneity. A thermodynamic interpretation for the wetting effect and the corresponding open questions are presented at the end.

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“…11 Diverse strategies have been applied to manipulate the droplet morphology and to regulate the evaporation rate, among which micro-and nanostructured surfaces with tailored wetting properties are widely utilized. 12 For high-throughput assays, techniques such as lithography, 13 electrochemical deposition, 14 and chemical functionalization 15 are commonly used to design miniaturized and parallelized microarrays.…”

Section: Introductionmentioning

confidence: 99%

“…In applications, such as coatings, 5,6 microfluidics, 7,8 ink‐jet printing, 9 and high‐throughput assays, 10 precise control of the droplet shapes and the evaporation behaviors on heterogeneous surfaces is of fundamental importance 11 . Diverse strategies have been applied to manipulate the droplet morphology and to regulate the evaporation rate, among which micro‐ and nanostructured surfaces with tailored wetting properties are widely utilized 12 . For high‐throughput assays, techniques such as lithography, 13 electrochemical deposition, 14 and chemical functionalization 15 are commonly used to design miniaturized and parallelized microarrays.…”

Section: Introductionmentioning

confidence: 99%

Digital twin of a droplet microarray platform: Evaporation behavior for multiple droplets on patterned chips for cell culture

Wu,

Urrutia Gomez,

Zhang

et al. 2024

Droplet

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Precise control of the evaporation of multiple droplets on patterned surfaces is crucial in many technological applications, such as anti‐icing, coating, and high‐throughput assays. Yet, the complex evaporation process of multiple droplets on well‐defined patterned surfaces is still poorly understood. Herein, we develop a digital twin system for real‐time monitoring of key processes on a droplet microarray (DMA), which is essential for parallelization and automation of the operations for cell culture. Specifically, we investigate the evaporation of multiple nanoliter droplets under different conditions via experiments and numerical simulations. We demonstrate that the evaporation rate is not only affected by the environmental humidity and temperature but is also strongly linked to the droplet distribution on the patterned surfaces, being significantly reduced when the droplets are densely distributed. Furthermore, we propose a theoretical method to aid in the experimental detection of volumes and pH variation of evaporating droplets on patterned substrates. This versatile and practical strategy allows us to achieve active maneuvering of the collective evaporation of droplets on a DMA, which provides essential implications for a wide range of applications including cell culture, heat management, microreactors, biochips, and so on.

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Recent progress in experiments for sessile droplet wetting on structured surfaces

Cited by 10 publications

References 93 publications

Droplet Evaporation Dynamics on Hydrophobic Network Surfaces

Droplet Evaporation Dynamics on Hydrophobic Network Surfaces

Wetting Effect on Patterned Substrates

Digital twin of a droplet microarray platform: Evaporation behavior for multiple droplets on patterned chips for cell culture

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