Lotus-leaf-inspired hierarchical structured surface with non-fouling and mechanical bactericidal performances

Jiang, Rujian; Hao, Lingwan; Song, Lingjie; Tian, Limei; Ye, Fan; Zhao, Jie; Liu, Chaozong; Ming, Weihua; Liu, Ren

doi:10.1016/j.cej.2020.125609

Cited by 154 publications

(100 citation statements)

References 56 publications

(86 reference statements)

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“…Super-hydrophobic (SH) micro-and nano-textured surfaces have been a subject of significant interest in a plethora of applications (Geyer et al 2020;Sharma et al 2018;Hwang et al 2018;Jiang et al 2020;Gaddam et al 2021;Chen et al 2019), where the existence of a heterogeneous wetting state namely the Cassie-Baxter state helps in achieving the desired functionality. Similarly, in flow settings where SH-textured surfaces are involved, particularly in microscale laminar flows, the Cassie-Baxter state helps in hydrodynamic drag reduction (Li et al 2017;Ko et al 2020) and enhanced thermo-hydraulic performance (Dilip et al 2018;Sharma et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic drag reduction of shear-thinning liquids in superhydrophobic textured microchannels

Gaddam

Sharma

Ahuja

et al. 2021

Microfluid Nanofluid

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Super-hydrophobic textured surfaces reduce hydrodynamic drag in pressure-driven laminar flows in micro-channels. However, despite the wide usage of non-Newtonian liquids in microfluidic devices, the flow behaviour of such liquids was rarely examined so far in the context of friction reduction in textured super-hydrophobic micro-channels. Thus, we have investigated the influence of topologically different rough surfaces on friction reduction of shear-thinning liquids in micro-channels. First, the friction factor ratio (a ratio of friction factor on a textured surface to a plain surface) on generic surface textures, such as posts, holes, longitudinal and transverse ribs, was estimated numerically over a range of Carreau number as a function of microchannel constriction ratio, gas fraction and power-law exponent. Resembling the flow behaviour of Newtonian liquids, the longitudinal ribs and posts have exhibited significantly less flow friction than the transverse ribs and holes while the friction factor ratios of all textures has exhibited non-monotonic variation with the Carreau number. While the minima of the friction factor ratio were noticed at a constant Carreau number irrespective of the microchannel constriction ratio, the minima have shifted to a higher Carreau number with an increase in the power-law index and gas fraction. Experiments were also conducted with aqueous Xanthan Gum liquids in micro-channels. The flow enhancement (the flow rate with super-hydrophobic textures with respect to a smooth surface) exhibited a non-monotonic behaviour and attenuated with an increase in power-law index tantamount to simulations. The results will serve as a guide to design frictionless micro-channels when employing non-Newtonian liquids.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic drag reduction of shear-thinning liquids in superhydrophobic textured microchannels

Gaddam

Sharma

Ahuja

et al. 2021

Microfluid Nanofluid

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“…An intriguing way to alter the surface morphology and form a biomimetic surface is nanostructuring. The natural or bio-inspired surfaces, like lotus leaf [ 38 ], dragon wings [ 7 ], gecko [ 38 , 39 ], and shark skin [ 40 ] with microstructures and/or dense nanoscale pillars have shown remarkable bactericidal properties [ 7 , 38 , 39 ], as those nanostructures are able to physically kill adhered bacteria via rupture of a bacterial cell by nanopillar structures. These types of surfaces have shown immense potential in the emerging worldwide epidemic of bacterial resistance to antibiotics as well as hospital-acquired infections, among them also human coronavirus [ 40 ].…”

Section: Antibacterial Metal Surfaces In Medicinementioning

confidence: 99%

Use of Plasma Technologies for Antibacterial Surface Properties of Metals

et al. 2021

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Bacterial infections of medical devices present severe problems connected with long-term antibiotic treatment, implant failure, and high hospital costs. Therefore, there are enormous demands for innovative techniques which would improve the surface properties of implantable materials. Plasma technologies present one of the compelling ways to improve metal’s antibacterial activity; plasma treatment can significantly alter metal surfaces’ physicochemical properties, such as surface chemistry, roughness, wettability, surface charge, and crystallinity, which all play an important role in the biological response of medical materials. Herein, the most common plasma treatment techniques like plasma spraying, plasma immersion ion implantation, plasma vapor deposition, and plasma electrolytic oxidation as well as novel approaches based on gaseous plasma treatment of surfaces are gathered and presented. The latest results of different surface modification approaches and their influence on metals’ antibacterial surface properties are presented and critically discussed. The mechanisms involved in bactericidal effects of plasma-treated surfaces are discussed and novel results of surface modification of metal materials by highly reactive oxygen plasma are presented.

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“…On the other hand, the effect of mechanical damage of bacteria can be combined with other treatments, for example, photoactivation of TiO 2 -producing reactive oxygen [157]. An additional interesting example is a combination of superhydrophobic surface and mechanical bactericidal surface properties, not only killing the bacteria but also removing the bacterial residues [158].…”

Section: Mechanically Responsive Coatingsmentioning

confidence: 99%

Physically Switchable Antimicrobial Surfaces and Coatings: General Concept and Recent Achievements

et al. 2021

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Bacterial environmental colonization and subsequent biofilm formation on surfaces represents a significant and alarming problem in various fields, ranging from contamination of medical devices up to safe food packaging. Therefore, the development of surfaces resistant to bacterial colonization is a challenging and actively solved task. In this field, the current promising direction is the design and creation of nanostructured smart surfaces with on-demand activated amicrobial protection. Various surface activation methods have been described recently. In this review article, we focused on the “physical” activation of nanostructured surfaces. In the first part of the review, we briefly describe the basic principles and common approaches of external stimulus application and surface activation, including the temperature-, light-, electric- or magnetic-field-based surface triggering, as well as mechanically induced surface antimicrobial protection. In the latter part, the recent achievements in the field of smart antimicrobial surfaces with physical activation are discussed, with special attention on multiresponsive or multifunctional physically activated coatings. In particular, we mainly discussed the multistimuli surface triggering, which ensures a better degree of surface properties control, as well as simultaneous utilization of several strategies for surface protection, based on a principally different mechanism of antimicrobial action. We also mentioned several recent trends, including the development of the to-detect and to-kill hybrid approach, which ensures the surface activation in a right place at a right time.

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Lotus-leaf-inspired hierarchical structured surface with non-fouling and mechanical bactericidal performances

Cited by 154 publications

References 56 publications

Hydrodynamic drag reduction of shear-thinning liquids in superhydrophobic textured microchannels

Hydrodynamic drag reduction of shear-thinning liquids in superhydrophobic textured microchannels

Use of Plasma Technologies for Antibacterial Surface Properties of Metals

Physically Switchable Antimicrobial Surfaces and Coatings: General Concept and Recent Achievements

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