Impact of oxidation of copper and its alloys in laboratory-simulated conditions on their antimicrobial efficiency

Walkowicz, M.; Osuch, Piotr; Smyrak, B.; Knych, T.; Rudnik, Ewa; Cieniek, Łukasz; Różańska, Anna; Chmielarczyk, Agnieszka; Romaniszyn, Dorota; Bulanda, Małgorzata

doi:10.1016/j.corsci.2018.05.033

Cited by 37 publications

(24 citation statements)

References 16 publications

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“…[8][9][10] However, Cu and its alloys become tarnished and corrode under the ambient conditions often involved in antimicrobial applications on various touch surfaces in healthcare facilities. [11,12] Another strategy to obtain wide color selectivity in a metal film is the construction of sophisticated nanostructures to realize various colors by means of polarization conversion. [13] Despite numerous attempts to modulate color by oxidation and nanostructuring efforts, [14][15][16] the complexity associated with conversion of the Cu lattice into an oxide remains an obstacle for coherent control of the interface between metal and metal oxide, which is necessary to obtain a full, well-defined color spectrum.…”

Section: Color Of Copper/copper Oxidementioning

confidence: 99%

Color of Copper/Copper Oxide

Kim

Lee

et al. 2021

Advanced Materials

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Stochastic inhomogeneous oxidation is an inherent characteristic of copper (Cu), often hindering color tuning and bandgap engineering of oxides. Coherent control of the interface between metal and metal oxide remains unresolved. Coherent propagation of an oxidation front in single‐crystal Cu thin film is demonstrated to achieve a full‐color spectrum for Cu by precisely controlling its oxide‐layer thickness. Grain‐boundary‐free and atomically flat films prepared by atomic‐sputtering epitaxy allow tailoring of the oxide layer with an abrupt interface via heat treatment with a suppressed temperature gradient. Color tuning of nearly full‐color red/green/blue indices is realized by precise control of the oxide‐layer thickness; the samples cover ≈50.4% of the standard red/green/blue color space. The color of copper/copper oxide is realized by the reconstruction of the quantitative yield color from the oxide “pigment” (complex dielectric functions of Cu2O) and light‐layer interference (reflectance spectra obtained from the Fresnel equations) to produce structural color. Furthermore, laser‐oxide lithography is demonstrated with micrometer‐scale linewidth and depth through local phase transformation to oxides embedded in the metal, providing spacing necessary for semiconducting transport and optoelectronics functionality.

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Section: Color Of Copper/copper Oxidementioning

confidence: 99%

Color of Copper/Copper Oxide

Kim

Lee

et al. 2021

Advanced Materials

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“…The copper structures were chosen for the in‐depth analysis because of its commonness in conductors, cost efficiency as well as antimicrobial efficiency making it favorable for wearable applications. [ 31 ] Copper foils were welded on a polyamide textile with different energy densities by changing only the laser power to find the setting at which the adhesion is the highest while the thermal degradation of the textile structure is the lowest (see Table 1 ). The polyamide textile was chosen because of its lower degradation rate in the melt phase and higher resistance to hydrolysis if compared to polyester textile.…”

Section: Resultsmentioning

confidence: 99%

“…An increase of the laser energy density also increases the local temperature of the metal foil, which increases the oxidation of copper and therewith its electrical resistivity. [ 31,34 ] However, as the elevated temperature lasts only for a short time, and the measured specific resistance corresponds to the literature value, this effect was neglected.…”

Section: Resultsmentioning

confidence: 99%

Metal‐Textile Laser Welding for Wearable Sensors Applications

Fromme

Camenzind

et al. 2021

Adv Elect Materials

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Electronic textile (E‐textile), an emerging technology, has the potential to revolutionize consumer electronics by transforming them into wearable devices. Highly conductive, textile conductors, suitable for commercialization, have yet not been developed. Here, a new metal‐textile laser welding method is presented for a rapid one‐step, stable, and cost‐efficient manufacturing of electrically conductive textiles. This method is a direct on‐textile approach for customized 2D nanothick metal coatings with flexible design. Different metals, like palladium, silver, or copper can be welded on functional membranes and textiles containing polymers. As shown by bonding a copper 2D pattern on a polyamide textile, the resistivity does not vary if compared to the bulk material. The generated interlocking bonding ensures strong physical adhesion between the partly molten polyamide fibers and a copper layer, resisting up to 10 000 abrasion cycles using the standardized Martindale test and up to 42 000 flexion cycles using the industrial standardized Schildknecht test. A promising application for textile integrated conductors is body monitoring sensors. The feasibility of a laser welded resistance temperature sensors on a functional membrane is demonstrated without impairing its mechanical stability. This technology presents suitable properties and variabilities for a wide range of application in E‐textiles and its commercialization.

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“…This study has demonstrated that the increases of 'L*' values of the experimental metals due to oxide formation on the surface at a temperature of 100°C. In case of copper, it delayed because of the oxygen diffuse into copper at 200°C in the air [20]. At the intermediate stage of heating, the decrees of 'L*' values occurs due to dissolution of some phases present into experimental metals.…”

Section: Isochronal Heatingmentioning

confidence: 99%

Physical Behaviour of Thermally Affected Bronze and Brass

Kaiser¹,

Kaiser

2020

JMEST

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The physical behavior of thermally affected cast copper, aluminum bronze and brass has been studied by subjecting to heating isochronally for one hour at a range of 600°C. It shows that solid-solution hardening takes place into the Al added bronze and Zn added brass metal. Due to heating Al forms hard and brittle intermetallic of copper aluminates into the bronze metal which responses some age-hardening effects. The electrical conductivity of the metals increases initially through heat treatment due to stress relieving and finally decreases due to formation of intermetallic precipitates. The color of the heated samples are also studied through tristimulus color parameter 'L*', 'a*', and 'b*' values which were analyzed and evaluated in MATLAB software. It is found that incorporation of Al and Zn affects the color of cast Cu. The overall change of color occurs with increasing heating temperature due to chemical changes like oxidization, intermetallic formation, dissolution of phases, precipitation coarsening and recrystallization. Due to change of hardness and microstructural properties of the experimental metals, the sound intensity level also decreases at high heating temperature. A microstructural study confirms that the cast alloys content the different phases of grains and bring about recrystallized status under heating at 500°C for one hour.

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Impact of oxidation of copper and its alloys in laboratory-simulated conditions on their antimicrobial efficiency

Cited by 37 publications

References 16 publications

Color of Copper/Copper Oxide

Color of Copper/Copper Oxide

Metal‐Textile Laser Welding for Wearable Sensors Applications

Physical Behaviour of Thermally Affected Bronze and Brass

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