Droplet sliding behaviour on textured and fluorinated surface

Nagato, Keisuke; Takahashi, Nana; Shimura, Tomohito; Nakao, Masayuki

doi:10.1016/j.cirp.2019.04.038

Cited by 12 publications

(4 citation statements)

References 15 publications

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“…The high static contact angle measured in the front view is caused by the sharp edges that act as energy barriers and create constraint force [34] impeding the spread of water. On the side view, however, the water spreads freely on the continuous surface of the wall thus giving a lower static contact angle [35]. Two distinct static contact angles were obtained during the contact angle measurements based on the droplet placement.…”

Section: Anisotropic Wetting and The Effect Of Drop Placement Locationmentioning

confidence: 99%

Indirect Additive Manufacturing of Hydrophobic Reentrant Surface Structures using Fused Deposition Modelling

Duran

Yang²,

Islam³

2023

Preprint

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Hydrophobicity is an important feature in medical applications. Reentrant structures are used to achieve this functionality on the surface to the greatest extent possible. This study provides a simple and cost-effective approach to producing these structures without the use of nanoparticles and fluorine-based coatings that can make this approach applicable to medical devices. This was done by indirect 3D printing using a low-cost commercially available Fused Deposition Modelling (FDM) printer. The FDM printer is used to create a mold with a top layer of straight lines separated by a gap. Polydimethylsiloxane (PDMS) is cast into it negatively replicating the mold surface to make the reentrant structures. As a result, a functionalized surface with the reentrant wall structure having an edge angle of 121° ± 10° was created with anisotropic wetting reaching an optimal static contact angle of 160.3° ± 2.9° with the lowest rolling angle of 29.2° ± 4.2° for a 10 uL water droplet.

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Section: Anisotropic Wetting and The Effect Of Drop Placement Locationmentioning

confidence: 99%

Indirect Additive Manufacturing of Hydrophobic Reentrant Surface Structures using Fused Deposition Modelling

Duran

Yang²,

Islam³

2023

Preprint

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“…6 Precise positioning of water droplets onto non-wetting surfaces has been demonstrated by the addition of magnetic deformation of the surface 7 and the distribution of more hydrophilic spots, 8 but in majority, vibration or mechanical movement (deformation) of the surface is used to trigger the droplet movement. 9,10 During this macroscopic movement, the contact angle varies drastically, in addition to the pressure of the droplet on the pillar array. This could induce irreversible pinning of the droplet if the pillar aspect ratio is not optimized.…”

Section: ■ Introductionmentioning

confidence: 99%

Digital Microfluidics─How Magnetically Driven Orientation of Pillars Influences Droplet Positioning

Bolteau

Gelebart

Teisseire

et al. 2023

ACS Appl. Mater. Interfaces

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Interfaces between a water droplet and a network of pillars produce eventually superhydrophobic, self-cleaning properties. Considering the surface fraction of the surface in interaction with water, it is possible to tune precisely the contact angle hysteresis (CAH) to low values, which is at the origin of the poor adhesion of water droplets, inducing their high mobility on such a surface. However, if one wants to move and position a droplet, the lower the CAH, the less precise will be the positioning on the surface. While rigid surfaces limit the possibilities of actuation, smart surfaces have been devised with which a stimulus can be used to trigger the displacement of a droplet. Light, electron beam, mechanical stimulation like vibration, or magnetism can be used to induce a displacement of droplets on surfaces and transfer them from one position to the targeted one. Among these methods, only few are reversible, leading to anisotropy-controlled orientation of the structured interface with water. Magnetically driven superhydrophobic surfaces are the most promising reprogramming surfaces that can lead to the control of wettability and droplet guidance.

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“…In contrast, for the structural patterns, surfaces are artificially modulated by fabricating features of nano‐ and micrometers (e.g., grooves, strips, pillars). Molding and embossing, [ 9 ] imprinting, [ 10 ] laser micromachining, [ 11,12 ] and metal deposition [ 13 ] can be employed to fabricate the structural patterns. The production of directional patterns is a common method for generating anisotropic wetting surfaces.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Wettability Induced by Femtosecond Laser Ablation

Shojaeian,

Yetisen,

Tasoglu

2023

Adv Eng Mater

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Laser ablation has been utilized for locally and selectively modifying the surface wettability of materials in situ and enabling on‐demand microfabrication. The anisotropic wettability has been observed on chemical and/or topographical patterns, such as an array of laser‐inscribed strips with spacings, created on surfaces during the fabrication process. Herein, the effectiveness of the femtosecond laser ablation is evaluated in selectively modifying surface wettability. The areas processed by laser ablation exhibit anisotropic wetting behavior, even after the laser strips are overlapped. The laser‐induced anisotropic surface wettability is present in space governed by laser scanning speed, scan/strip overlap, laser fluence, scan repetition, and bidirectional scanning angle. Moreover, the femtosecond laser ablation process is optimized to enhance the conventional laser inscription, leading to a modified and consistent methodology to achieve cost‐effective fabrication.

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Droplet sliding behaviour on textured and fluorinated surface

Cited by 12 publications

References 15 publications

Indirect Additive Manufacturing of Hydrophobic Reentrant Surface Structures using Fused Deposition Modelling

Indirect Additive Manufacturing of Hydrophobic Reentrant Surface Structures using Fused Deposition Modelling

Digital Microfluidics─How Magnetically Driven Orientation of Pillars Influences Droplet Positioning

Anisotropic Wettability Induced by Femtosecond Laser Ablation

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