Directional Droplet Transport on Functional Surfaces with Superwettabilities

Lv, Pin; Zhang, Yong‐Lai; Han, Dongdong; Sun, Hong‐Bo

doi:10.1002/admi.202100043

Cited by 53 publications

(40 citation statements)

References 200 publications

(124 reference statements)

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“…The parahydrophobic glove can be used for preparing a small amount of solution for experiments that are low cost and environmentally friendly. Such droplet-based microextractors and microreactors have broad application prospects in protein crystallization, enzyme kinetics, and other biochemical reactions. − …”

Section: Resultsmentioning

confidence: 99%

“…So far, many efforts have been made to develop artificial bionic hydrophobic micropatterns with hierarchical structures on textiles, including coating, , etching, , chemical vapor deposition, , layer-by-layer self-assembly, etc. However, some complex hydrophobic patterns in nature exceed the ability of traditional manufacturing strategies, , resulting in the inability to accurately manufacture controllable nanostructures on textiles, which hinder the development of parahydrophobic textiles. Therefore, the development of a strategy that is convenient for accurately forming the unit shape of microstructures will help to establish parahydrophobic surfaces.…”

Section: Introductionmentioning

confidence: 99%

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3D-Printed Parahydrophobic Functional Textile with a Hierarchical Nanomicroscale Structure

et al. 2022

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Functional textiles with superhydrophobicity and high adhesion to water, called parahydrophobic, are attracting increasing attention from industry and academia. The hierarchical (micronanoscale) surface patterns in nature provide an excellent reference for the manufacture of parahydrophobic functional textiles. However, the replication of the complex parahydrophobic micronanostructures in nature exceeds the ability of traditional manufacturing strategies, which makes it difficult to accurately manufacture controllable nanostructures on yarn and textiles. Herein, a two-photon femtosecond laser direct writing strategy with nanoscale process capability was utilized to accurately construct the functional parahydrophobic yarn with a diameter of 900 μm. Inspired by rose petals, the parahydrophobic yarn is composed of a hollow round tube, regularly arranged micropapillae (the diameter is 109 μm), and nanofolds (the distance is 800 nm) on papillae. The bionic yarn exhibited a superior parahydrophobic behavior, where the liquid droplet not only was firmly adhered to the bionic yarn at an inverted angle (180°) but also presented as spherical on the yarn (the maximum water contact angle is 159°). The fabric woven by the bionic yarn also exhibited liquid droplet-catching ability even when tilted vertically or turned upside down. Based on the excellent parahydrophobic function of bionic yarn, we demonstrated a glove that has very wide application potential in the fields of water droplet-based transportation, manipulation, microreactors, microextractors, etc.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3D-Printed Parahydrophobic Functional Textile with a Hierarchical Nanomicroscale Structure

et al. 2022

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“…Directional droplet-sliding omniphobic surfaces play an important role in the development of advanced surface engineering applications. , Such functional surfaces have been utilized in liquid manipulation or collection, − prevention of surface contamination, − microfluidics for biological and chemical analyses. , More recently, portable and transparent thin sticker-type directional omniphobic films have attracted increasing attention in personal hygiene and green technology, such as transparent panels of smart devices, disposable PCR testers, and personal antibacterial belongings (bottles). Such films should be able to easily attach to and detach from any surface regardless of the curvature.…”

Section: Introductionmentioning

confidence: 99%

Robust and Transparent Lossless Directional Omniphobic Ultra-Thin Sticker-Type Film with Re-entrant Micro-Stripe Arrays

Kang

2022

ACS Appl. Mater. Interfaces

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Directional droplet-sliding control without wetting the surface is immensely required in advanced surface engineering, including biological and chemical analyses or green technology. However, the development of robust and transparent thin sticker-type directional omniphobic films for portable usage in smart microfluidic platforms is rare. In this study, we report a novel perfluoropolyether (PFPE) directional omniphobic film (PDOF). The PDOF is a robust and transparent ultra-thin sticker-type film that can control the anisotropic sliding of various liquid droplets on the surface. The PFPE is a chemically stable and turgid material compared to polydimethylsiloxane (PDMS), which is often used to fabricate liquid-repellent thin films. A well-designed fabrication criterion through adhesion engineering in the soft-molding process was developed using the PFPE to obtain a PDOF with a thickness of 56 μm, with re-entrant micro-stripe structures on the surface. The fabricated PDOF showed intriguing liquid sliding properties based on the direction and spacing of the microstructures. This aspect is defined as an anisotropic factor.

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“…Protecting materials surfaces with superantiwetting coatings is vital to regulate their surface interaction with environmental conditions to improve their functionality and lifetime. [1][2][3][4][5][6] Without impacting the bulk chemistry and functionality (e.g., mechanical, electrical, optical), only coating the surface with low surface energy and high roughness patterns is known to be a well-accepted procedure for manufacturing various engineering materials used in medicine, 7,8 water purification, 9,10 energy conversion, 11,12 textile 5,13,14 and many more. Various methods transfer low surface energy and high roughness shielding material around the host material, namely dip coating, 4,15 physical vapor deposition, 16 3D-printing 17 , and chemical vapor deposition (CVD).…”

Section: Introductionmentioning

confidence: 99%

Droplet size assisted polysiloxane architecting

Varol

Seeger

2022

Preprint

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(Super)antiwetting shielding around engineering materials and protecting them against harsh environmental conditions has been achieved in recent years via growing various geometry polysiloxane (or silicone) patterns around them by using droplet assisted growth (DAGS) method, where the polymerization takes place inside of the water droplets acting as reaction vessels. The size and distribution of these reaction vessels are the main factors in making different geometry silicone patterns; however, very little is known about the fate of these droplets throughout the polymerization. Here, we proposed keeping the relative humidity (% RH) inside the reactor stable throughout the polymerization as a new coating parameter to force the size of the reaction vessel water droplets to be the same for building simple shape silicone rods with controlled geometry and distribution. In this manner, we grew simple geometry cylindric micro-rods on surfaces and could tune their length, diameter, inter-rod spacings, and thus the (super)hydrophobicity. Beyond fabricating simple geometry cylindrical micro rods, here, we also demonstrate that by changing the amplitude and the stability of the % RH, it is possible to fabricate different (super)hydrophobic nano-grasses, conical silicone micro-rods, and isotropic silicone nanofilaments (SNF). In the end, the proposed new way of tuning initial and in-situ reaction vessel droplet size can be used as a single factor to formulate different geometry silicone patterns with tunable dimensions, leading to different roughness and thus different degrees of hydrophobicity and superhydrophobicity. Due to its simplicity, silicone patterning with irregular spacing and size is preferred among other coating techniques, but the mathematical description of these irregular patterns is not trivial to explain their (super)hydrophobicity. To a certain extent, the droplet-size-assisted silicone shaping in this work provides a new way to control the length, diameter, morphology, inter-rod spacing, and thus the (super)hydrophobicity of the silicone patterns, especially those in the shape of simple cylindrical micro-rods. This control over silicone architecting will help to prepare new (super)hydrophobic coatings with more controlled morphology and thus wettability; on the other hand, it will support surface scientists modeling the connection between surface geometry and (super)antiwetting of such irregular pillared surfaces that remain elusive.

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Directional Droplet Transport on Functional Surfaces with Superwettabilities

Cited by 53 publications

References 200 publications

3D-Printed Parahydrophobic Functional Textile with a Hierarchical Nanomicroscale Structure

3D-Printed Parahydrophobic Functional Textile with a Hierarchical Nanomicroscale Structure

Robust and Transparent Lossless Directional Omniphobic Ultra-Thin Sticker-Type Film with Re-entrant Micro-Stripe Arrays

Droplet size assisted polysiloxane architecting

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