Pinning mechanism of advancing sessile droplet on superhydrophobic surfaces

Wu, Jun; Xia, Jun; Lei, Wei; Wang, Baoping

doi:10.1039/c4ra06428c

Cited by 8 publications

(6 citation statements)

References 24 publications

(37 reference statements)

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“…In addition, the contact angle hysteresis and pinning force were calculated, and they showed a similar phenomenon (Figure S6D–J). − Taken together, we verified our hypothesis that, through controlling the film’s surface morphology, we can directly control the lubricant content on the surface, achieved by modulating the surface liquid-repellent property.…”

Section: Results and Discussionsupporting

confidence: 72%

Patterned Slippery Surface through Dynamically Controlling Surface Structures for Droplet Microarray

Huang

Chen

et al. 2019

Chem. Mater.

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Patterned slippery surfaces based on the technique of slippery liquid-infused porous surface (SLIPS) have broad technological applications in biofouling, liquid handling, biomolecule collection, and droplet microarrays. However, methods to generate patterned SLIPS with flexibility and practical potential remain a technical roadblock. Here, we report an approach for generating patterned SLIPS, and by utilizing which, as a proof-of-technique application, the droplet microarrays have been presented. Our approach is based on a photocross-linkable polyelectrolyte poly(ethyleneimine)/azide-poly(acrylic acid) (PEI/PAA-N3) film, whose surface structures can be dynamically controlled. We have prepared the surface-patterned PEI/PAA-N3 film containing microstructured and flat regions. We then demonstrate that, because of much higher lubricant retaining capability of the microstructured regions, a patterned SLIPS can be simply generated through infusing the lubricant onto the surface and applying a shear spinning process. This work highlights the importance of the dynamics of surface structures to functional materials, showing broad potential applications.

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Section: Results and Discussionsupporting

confidence: 72%

Patterned Slippery Surface through Dynamically Controlling Surface Structures for Droplet Microarray

Huang

Chen

et al. 2019

Chem. Mater.

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“…[31a] Liquid droplets are expected to wet and penetrate into the microscale papillae, while a large amount of air trapped inside the nanoscale folds resulted in the forming special rose petal‐like wetting state with high adhesion. Inspired by the adhesion mechanism of rose petals and geckos, several efforts have been paid to construct sticky super‐antiwetting surfaces, on which droplets do not slide even with a tilting angle of 90° . For example, Jin et al fabricated well‐aligned superhydrophobic polystyrene nanotubes surface with high hysteresis by using anodized alumina membrane templates.…”

Section: Tio2‐based Surfaces With Specific Wetting Statesmentioning

confidence: 99%

Recent Advances in TiO₂-Based Nanostructured Surfaces with Controllable Wettability and Adhesion

Chen

Huang

Cui

et al. 2015

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Bioinspired surfaces with special wettability and adhesion have attracted great interest in both fundamental research and industry applications. Various kinds of special wetting surfaces have been constructed by adjusting the topographical structure and chemical composition. Here, recent progress of the artificial superhydrophobic surfaces with high contrast in solid/liquid adhesion has been reviewed, with a focus on the bioinspired construction and applications of one-dimensional (1D) TiO2-based surfaces. In addition, the significant applications related to artificial super-wetting/antiwetting TiO2-based structure surfaces with controllable adhesion are summarized, e.g., self-cleaning, friction reduction, anti-fogging/icing, microfluidic manipulation, fog/water collection, oil/water separation, anti-bioadhesion, and micro-templates for patterning. Finally, the current challenges and future prospects of this renascent and rapidly developing field, especially with regard to 1D TiO2-based surfaces with special wettability and adhesion, are proposed and discussed.

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“… 24 In any of the above systems, pinning of the contact line can be advantageous or impede the droplet motion or its manipulation, leading to greater or lower efficiency of relevant processes. 4 , 5 , 26 − 31 There are still outstanding issues that remain regarding the possibility of exploiting the effects of droplet pinning and substrate wettability in controlling droplet motion. This is especially true regarding microlevel origins of pinning and its mechanism, which can be advantageous for various nanotechnology applications.…”

Section: Introductionmentioning

confidence: 99%

“…In materials science, for example, a design based on micropillar structures has been shown to lead to superhydrophobic substrates for, among others, self-cleaning and anti-icing . As a result of this specific design, pinning effects naturally arise that may affect a droplet’s motion by introducing a sticky or slippery behavior, − which also depends on the substrate wettability. , By means of the lubrication theory, Joanny and Robbins have investigated the dynamics of a contact line on a heterogeneous plate, which is advanced at a constant force or velocity . They have unveiled the scaling of the force and the velocity and, also, found that alternating patches of constant wettability produce a linear relation.…”

Section: Introductionmentioning

confidence: 99%

“…In another example, substrates characterized by a gradient of a physical or chemical property in a particular direction along the substrate can steer the motion of liquid droplets without the requirement of an external energy source. − A well-known example is durotaxis, where a droplet can autonomously move along a substrate due to the presence of a stiffness gradient, − which crucially depends on the wettability of the substrate . In any of the above systems, pinning of the contact line can be advantageous or impede the droplet motion or its manipulation, leading to greater or lower efficiency of relevant processes. ,,− There are still outstanding issues that remain regarding the possibility of exploiting the effects of droplet pinning and substrate wettability in controlling droplet motion. This is especially true regarding microlevel origins of pinning and its mechanism, which can be advantageous for various nanotechnology applications.…”

Section: Introductionmentioning

confidence: 99%

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Droplet Control Based on Pinning and Substrate Wettability

Theodorakis

Amirfazli

Hu³

et al. 2021

Langmuir

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Pinning of liquid droplets on solid substrates is ubiquitous and plays an essential role in many applications, especially in various areas such as microfluidics and biology. Although pinning can often reduce the efficiency of various applications, a deeper understanding of this phenomenon can actually offer possibilities for technological exploitation. Here, by means of molecular dynamics simulation, we identify the conditions that lead to droplet pinning or depinning and discuss the effects of key parameters in detail, such as the height of the physical pinning barrier and the wettability of the substrates. Moreover, we describe the mechanism of barrier crossing by the droplet upon depinning, identify the driving force of this process, and, also, elucidate the dynamics of the droplet. Not only does our work provide a detailed description of the pinning and depinning processes but also it explicitly highlights how both processes can be exploited in nanotechnology applications to control the droplet motion. Hence, we anticipate that our study will have significant implications for the nanoscale design of substrates in micro- and nanoscale systems and will assist with assessing pinning effects in various applications.

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Pinning mechanism of advancing sessile droplet on superhydrophobic surfaces

Cited by 8 publications

References 24 publications

Patterned Slippery Surface through Dynamically Controlling Surface Structures for Droplet Microarray

Patterned Slippery Surface through Dynamically Controlling Surface Structures for Droplet Microarray

Recent Advances in TiO₂-Based Nanostructured Surfaces with Controllable Wettability and Adhesion

Droplet Control Based on Pinning and Substrate Wettability

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Pinning mechanism of advancing sessile droplet on superhydrophobic surfaces

Cited by 8 publications

References 24 publications

Patterned Slippery Surface through Dynamically Controlling Surface Structures for Droplet Microarray

Patterned Slippery Surface through Dynamically Controlling Surface Structures for Droplet Microarray

Recent Advances in TiO2-Based Nanostructured Surfaces with Controllable Wettability and Adhesion

Droplet Control Based on Pinning and Substrate Wettability

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Product

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Recent Advances in TiO₂-Based Nanostructured Surfaces with Controllable Wettability and Adhesion