Motion of Drops with Different Viscosities on Micro‐Nanotextured Surfaces of Varying Topography and Wetting Properties

Sarkiris, Panagiotis; Ellinas, Kosmas; Gkiolas, Dimitris; Mathioulakis, D. S.; Gogolides, Εvangelos

doi:10.1002/adfm.201902905

Cited by 24 publications

(18 citation statements)

References 40 publications

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“…The additional fluoropolyurethane, as shown in Figure 5c,d and Figure 5g,h, indicated a minor morphology difference compared with the Cu 2+ / HNO 3 -etched only zinc substrate in Figure 5a,b and Figure 5e,f, and outstanding compactness on the etched surface. From the following contact angle (CA) analysis, this surface structure also contributed to the construction of superhydrophobic surfaces [23,24]. Unetched zinc + fluoropolyurethane (×50,000 times), (e) Cu 2+ / HNO 3 -etched zinc (×1000 times), (f) Cu 2+ / HNO 3 -etched zinc (×50,000 times), (g) Cu 2+ / HNO 3 -etched zinc + fluoropolyurethane (×1000 times), and (h) Cu 2+ / HNO 3 etched zinc + fluoropolyurethane (×50,000 times).…”

Section: Surface Morphologymentioning

confidence: 99%

“…It was shown that a nano/micrometer superhydrophobic surface could be formed on the surface of the zinc substrate through chemical etching. Such a surface could provide good properties of superhydrophobicity and drag reduction [24]. This surface was not stained with water, and the rolling was extremely likely to occur.…”

Section: Surface Wettability Analysismentioning

confidence: 99%

“…Besides, the spatial surface structures formed by chemical etching and the substitution reaction would also enhance the drag-reduction effect. As the roughness increased, the threshold force to initiate the drop motion would decrease [24]. Hence, the combination of a chemical etching method and a proper coating material could not only extend the original mechanical and chemical durability by the protective coating, but its surface structure advantages could also be reserved [25].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Zinc Substrate Encapsulated by Fluoropolyurethane and Its Drag-Reduction Enhancement by Chemical Etching

Cui

Zhu

et al. 2020

Coatings

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A fluoropolyurethane-encapsulated process was designed to rapidly fabricate low-flow resistance surfaces on the zinc substrate. For the further enhancement of the drag-reduction effect, Cu2+-assisted chemical etching was introduced during the fabrication process, and its surface morphology, wettability, and flow-resistance properties in a microchannel were also studied. It is indicated that the zinc substrate with a micro-nanoscale roughness obtained by Cu2+-assisted nitric acid etching was superhydrophilic. However, after the etched zinc substrate is encapsulated with fluoropolyurethane, the superhydrophobic wettability can be obtained with a contact angle of 154.8° ± 2.5° and a rolling angle of less than 10°. As this newly fabricated surface was placed into a non-standard design microchannel, it was found that with the increase of Reynolds number, the drag-reduction rate of the superhydrophobic surface remained basically unchanged at 4.0% compared with the original zinc substrate. Furthermore, the prepared superhydrophobic surfaces exhibited outstanding reliability in most liquids.

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Section: Surface Morphologymentioning

confidence: 99%

Section: Surface Wettability Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of Zinc Substrate Encapsulated by Fluoropolyurethane and Its Drag-Reduction Enhancement by Chemical Etching

Cui

Zhu

et al. 2020

Coatings

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“…In this context, in our previous work [34] we presented a simple method for the fabrication of universal, metal-sputtered superhydrophobic "hybrid" antibacterial surfaces exhibiting both anti-adhesive and bactericidal long-term activity against Gram-negative bacteria of concentrations as high as 2 × 10 9 cfu/mL, one of the highest ever reported in the literature. One explanation for the beneficial anti-adhesive behavior of the proposed superhydrophobic surfaces is possibly their low friction properties [40]. Herein, we demonstrate the optimization process of the surface properties, meaning the appropriate combination of low surface energy coating and bactericidal agent that allows the expression of the dual antibacterial functionality of such surfaces.…”

Section: Introductionmentioning

confidence: 88%

Optimization of Antibacterial Properties of “Hybrid” Metal-Sputtered Superhydrophobic Surfaces

et al. 2019

Self Cite

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Bacterial attachment and colonization to hygiene sensitive surfaces, both public and nosocomial, as well as in food industry areas, poses a serious problem to human healthcare. Several infection incidents are reported, while bacterial resistance to antibiotics is increasing. Recently, novel techniques for the design of antibacterial surfaces to limit bacterial spreading have emerged, including bifunctional antibacterial surfaces with antifouling and bactericidal action. In this context, we have recently developed smart, universal, metal-sputtered superhydrophobic surfaces, demonstrating both bacterial repulsion and killing efficacy. Herein, we present the optimization process that led to the realization of these “hybrid” antibacterial surfaces. To this end, two bactericidal agents, silver and copper, were tested for their efficiency against Gram-negative bacteria, with copper showing a stronger bactericidal action. In addition, between two low surface energy coatings, the fluorinated-alkyl self-assembled chlorosilane layer from perfluorinated octyltrichlorosilane (pFOTS) solution and the fluorocarbon layer from octafluorocyclobutane (C4F8) plasma were both approved for their anti-adhesive properties after immersion in bacterial solution. However, the latter was found to be more efficient when engrafted with the bactericidal agent in shielding its killing performance. Furthermore, the thickness of the plasma-deposited fluorocarbon layer was optimized, in order to simultaneously retain both the superhydrophobicity of the surface and its long-term bactericidal activity.

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“…Recently our group reported that plasma‐based surface micro‐nanotexturing is an effective new approach for inducing reduced friction of liquids, [ 35 ] this can be translated to low adhesion and interaction of liquids on such surfaces. We also evaluated such low adhesion surfaces on commercial polymeric substrates for their antibacterial action and presented the incorporation of bactericidal agents inside such surfaces for the fabrication of “hybrid” antibacterial surfaces with highly promising bactericidal action on cyanobacteria.…”

Section: Introductionmentioning

confidence: 99%

Bactericidal Action of Smooth and Plasma Micro‐Nanotextured Polymeric Surfaces with Varying Wettability, Enhanced by Incorporation of a Biocidal Agent

Dimitrakellis

Ellinas

Kaprou

et al. 2021

Macro Materials & Eng

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The use of antibacterial surfaces is an effective way to reduce exposure to pathogens and therefore infections. Several methods to fabricate antibacterial surfaces using surface modification methods as well as a bactericidal agent incorporation inside materials have been reported. However, in most cases the factors affecting the antibacterial behavior of a surface are not discussed in detail. Here, a comparative study on the antibacterial properties of surfaces with different characteristics against Gram‐negative bacteria (Escherichia coli) under dynamic conditions is presented, aiming to unravel the interplay among the most important factors when realizing an antibacterial surface, that is, surface morphology, wetting properties, and the use of a bactericidal agent. Significant bactericidal efficacy for the micro‐nanotextured, superhydrophilic surfaces is demonstrated, possibly due to a mechanical killing induced by the interaction of bacteria with the micro‐nanotopography. On the other hand, superhydrophobic surfaces without any bactericidal agent exhibit low interaction with the bacteria containing medium and therefore lower bactericidal action, whereas superhydrophobic surfaces with a bactericidal agent exhibit extreme non‐wetting properties and rapid bactericidal effect through release of Cu particles. Finally, the role of the hydrophobic coating as barrier against uncontrolled release of the bactericidal agent when deposited as top layer is also showcased.

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Motion of Drops with Different Viscosities on Micro‐Nanotextured Surfaces of Varying Topography and Wetting Properties

Cited by 24 publications

References 40 publications

Fabrication of Zinc Substrate Encapsulated by Fluoropolyurethane and Its Drag-Reduction Enhancement by Chemical Etching

Fabrication of Zinc Substrate Encapsulated by Fluoropolyurethane and Its Drag-Reduction Enhancement by Chemical Etching

Optimization of Antibacterial Properties of “Hybrid” Metal-Sputtered Superhydrophobic Surfaces

Bactericidal Action of Smooth and Plasma Micro‐Nanotextured Polymeric Surfaces with Varying Wettability, Enhanced by Incorporation of a Biocidal Agent

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