Superhydrophobic copper in biological liquids: Antibacterial activity and microbiologically induced or inhibited corrosion.
TL;DR: It is shown that by controlling the corrosion resistance and the wettability of the superhydrophobic copper substrate, it becomes possible to sustain the bactericidal action of copper substrates for a long time, simultaneously avoiding the excessive corrosive degradation and release of copper ions in the environment.
About: This article is published in Colloids and Surfaces B: Biointerfaces.The article was published on 2020-01-01. It has received 32 citations till now. The article focuses on the topics: Copper.
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TL;DR: In this article, a brief review and perspective study provides an overview about the characteristics, fabrication and recent advances of three types of interfacial materials with special wettability, namely superhydrophobic, superamphiphobic and slippery liquid-infused porous surface (SLIPS) toward anti-corrosion and anti-biofouling applications.
Abstract: Nature-inspired interfacial materials with special wettability have received considerable attention owing to their superior properties and promising multifunctional applications. Owing to the unique interfacial phase contacts and liquid–repellent property, the interfacial materials with special wettability provide a great potential for corrosion inhibition and biofouling suppression. Thus, this brief review and perspective study provides an overview about the characteristics, fabrication and recent advances of three types of interfacial materials with special wettability, namely superhydrophobic, superamphiphobic and slippery liquid-infused porous surface (SLIPS) toward anti-corrosion and anti-biofouling applications. The bottlenecks and future research priorities of the functional interfacial materials with special wettability were pointed out to accelerate the comprehensive understanding and the development of this research field.
42 citations
TL;DR: In this paper, a superhydrophobic surface was fabricated on aluminum alloy substrates through ammonia etching followed with 1H,1H, 2H,2H 2H-perfluorodecyltriethoxysilane (PFDTES) modification.
41 citations
TL;DR: In this article, a micro-nano-structured super-hydrophobic Ni film with a mean thickness of 4μm was electrodeposited on a Cu substrate via a two-step electrodeposition process at 60°C including 8min of electrodepposition at a constant current density of 20μ/cm2, followed by 1min of electrolydeposition at 50μ/ cm2 and a subsequent chemical modification step in stearic acid solution.
Abstract: The application of hierarchically micro-nano structured superhydrophobic Ni films with increased surface roughness is known as an attractive corrosion protection strategy because the chemically modified film with a low surficial free energy is capable of keeping water molecules and aggressive species away from the coating/electrolyte interface by trapping air pockets within the micro-nano structured layer. Furthermore, corrosion inhibitors are widely used for corrosion mitigation in a broad range of industrial applications. This study tends to investigate the corrosion resistance of electrodeposited superhydrophobic Ni films in the presence of sodium molybdate (0 M, 0.03 M, 0.06 M, 0.1 M) as an inorganic corrosion inhibitor in a 3.5 wt% NaCl solution at 25 °C, up to 120 h. The micro-nano structured superhydrophobic Ni film with a mean thickness of 4 μm was electrodeposited on a Cu substrate via a two-step electrodeposition process at 60 °C including 8 min of electrodeposition at a constant current density of 20 mA/cm2, followed by 1 min of electrodeposition at a constant current density of 50 mA/cm2 and a subsequent chemical modification step in stearic acid solution. Investigation of surface topography of the film by atomic force microscopy technique (AFM) revealed that the root-mean-square of height and the skewness of the film were equal to 14.4 nm and 0.21, respectively. The morphology of the film consisted of micro-nano cones in the size range of 50 to 1000 nm. The superhydrophobic film demonstrated a passivation behavior and a pitting potential. The EIS study identified the Ni film as a non-ideal capacitor and an equivalent circuit model with two parallel time-constants fitted to the EIS data. Upon 120 h of immersion of the superhydrophobic film in the electrolyte in the presence of 0.1 M of sodium molybdate, the corrosion inhibitor efficiency of about 80% was achieved and the Ni film demonstrated the best passivation behavior and the lowest corrosion current density.
37 citations
TL;DR: In this article, a set of facile methods involving selective chemical etching using concentrated NaOH, as well as fluorination with perfluoropolyether methyl ester were adopted to fabricate a superhydrophobic surface on basalt scales, having the required rough hierarchical micro-nanotextured and low surface energy.
34 citations
TL;DR: In this article, a lotus leaf inspired super-hydrophobic matrix composed by Fe-myristic acid compound is prepared on copper surface by a facile electrodeposition approach based on a coordinationdeposition mechanism, which leads to porous structure composed of hydrophobic compound from an ethanol bath via a single step.
31 citations
References
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TL;DR: The complement of efflux systems of 63 sequenced prokaryotes was compared with that of the heavy metal resistant bacterium Ralstonia metallidurans and showed that heavy metal resistance is the result of multiple layers of resistance systems with overlapping substrate specificities, but unique functions.
Abstract: What makes a heavy metal resistant bacterium heavy metal resistant? The mechanisms of action, physiological functions, and distribution of metal-exporting proteins are outlined, namely: CBA efflux pumps driven by proteins of the resistance–nodulation–cell division superfamily, P-type ATPases, cation diffusion facilitator and chromate proteins, NreB- and CnrT-like resistance factors. The complement of efflux systems of 63 sequenced prokaryotes was compared with that of the heavy metal resistant bacterium Ralstonia metallidurans. This comparison shows that heavy metal resistance is the result of multiple layers of resistance systems with overlapping substrate specificities, but unique functions. Some of these systems are widespread and serve in the basic defense of the cell against superfluous heavy metals, but some are highly specialized and occur only in a few bacteria. Possession of the latter systems makes a bacterium heavy metal resistant.
1,333 citations
TL;DR: Six metal resistance mechanisms exist: exclusion by permeability barrier, intra- and extra-cellular sequestration, active transport efflux pumps, enzymatic detoxification, and reduction in the sensitivity of cellular targets to metal ions.
1,247 citations
TL;DR: The mechanism of contact killing is understood since it may bear on central issues, such as the possibility of the emergence and spread of resistant organisms, cleaning procedures, and questions of material and object engineering.
Abstract: Bacteria, yeasts, and viruses are rapidly killed on metallic copper surfaces, and the term “contact killing” has been coined for this process. While the phenomenon was already known in ancient times, it is currently receiving renewed attention. This is due to the potential use of copper as an antibacterial material in health care settings. Contact killing was observed to take place at a rate of at least 7 to 8 logs per hour, and no live microorganisms were generally recovered from copper surfaces after prolonged incubation. The antimicrobial activity of copper and copper alloys is now well established, and copper has recently been registered at the U.S. Environmental Protection Agency as the first solid antimicrobial material. In several clinical studies, copper has been evaluated for use on touch surfaces, such as door handles, bathroom fixtures, or bed rails, in attempts to curb nosocomial infections. In connection to these new applications of copper, it is important to understand the mechanism of contact killing since it may bear on central issues, such as the possibility of the emergence and spread of resistant organisms, cleaning procedures, and questions of material and object engineering. Recent work has shed light on mechanistic aspects of contact killing. These findings will be reviewed here and juxtaposed with the toxicity mechanisms of ionic copper. The merit of copper as a hygienic material in hospitals and related settings will also be discussed.
1,183 citations
TL;DR: The requirements and merits of nanotechnology-based antimicrobials for the control of biofilm-infection form the focus of this Tutorial Review.
Abstract: Bacterial-infections are mostly due to bacteria in an adhering, biofilm-mode of growth and not due to planktonically growing, suspended-bacteria. Biofilm-bacteria are much more recalcitrant to conventional antimicrobials than planktonic-bacteria due to (1) emergence of new properties of biofilm-bacteria that cannot be predicted on the basis of planktonic properties, (2) low penetration and accumulation of antimicrobials in a biofilm, (3) disabling of antimicrobials due to acidic and anaerobic conditions prevailing in a biofilm, and (4) enzymatic modification or inactivation of antimicrobials by biofilm inhabitants. In recent years, new nanotechnology-based antimicrobials have been designed to kill planktonic, antibiotic-resistant bacteria, but additional requirements rather than the mere killing of suspended bacteria must be met to combat biofilm-infections. The requirements and merits of nanotechnology-based antimicrobials for the control of biofilm-infection form the focus of this Tutorial Review.
385 citations
TL;DR: This review summarizes the latest findings about ‘contact killing’, the mechanism of action of copper nanoparticles and the different ways micro‐organisms develop resistance to copper.
Abstract: With the emergence of antibiotic resistance, the interest for antimicrobial agents has recently increased again in public health. Copper was recognized in 2008 by the United States Environmental Protection Agency (EPA) as the first metallic antimicrobial agent. This led to many investigations of the various properties of copper as an antibacterial, antifungal and antiviral agent. This review summarizes the latest findings about 'contact killing', the mechanism of action of copper nanoparticles and the different ways micro-organisms develop resistance to copper.
358 citations