Brief review of oxidation kinetics of copper at 350 °C to 1050 °C

Zhu, Yongfu; Mimura, Kouji; Lim, Joo Weon; Isshiki, Minoru; Jiang, Qing

doi:10.1007/s11661-006-1074-y

Cited by 165 publications

(75 citation statements)

References 22 publications

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“…During the growth of CuO layer and CuO nanowires, Cu ions diffuse upward through the Cu 2 O layer 20 . Temperature has an important effect on the growth of CuO nanowires, the main diffusion way of Cu ion is grain boundary diffusion at the temperature of 400 °C 21 in this paper. In the process of grain boundary diffusion (Fig.…”

Section: Resultsmentioning

confidence: 93%

Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity

Zhu

Wang

et al. 2018

Sci Rep

122

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Nanofluids offer the exciting new possibilities to enhance heat transfer performance. In this paper, experimental and theoretical investigations have been conducted to determine the effect of CuO nanowires on the thermal conductivity and viscosity of dimethicone based nanofluids. The CuO nanowires were prepared through a thermal oxidation method, and the analysis indicated that the as-prepared CuO nanowires had high purity, monocrystalline with a monoclinic structure and large aspect ratio compared to CuO nanospheres. The experimental data show that the thermal conductivity of the nanofluids increases with the volume fraction of CuO nanowires or nanospheres, with a nearly linear relationship. For the nanofluid with the addition of 0.75 vol.% CuO nanowires, the thermal conductivity enhancement is up to 60.78%, which is much higher than that with spherical CuO nanoparticles. The nanofluids exhibit typical Newtonian behavior, and the measured viscosity of CuO nanowires contained nanofluids were found only 6.41% increment at the volume fraction of 0.75%. It is attractive in enhanced heat transfer for application. The thermal conductivity and viscosity of CuO nanofluids were further calculated and discussed by comparing our experimental results with the classic theoretical models. The mechanisms of thermal conductivity and viscosity about nanofluids were also discussed in detail.

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Section: Resultsmentioning

confidence: 93%

Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity

Zhu

Wang

et al. 2018

Sci Rep

122

View full text Add to dashboard Cite

show abstract

“…The kinetics of the metal oxidation can be described by many dependences, out of which is parabolic (Equation (11)), which is the most commonly recognized one, due to its simplicity, self-consistency and good correspondence to the experimental results [39]:

w^{2} = k t

where w stands for weight gain per surface unit, k is a parabolic rate constant of oxidation and t is time. The oxidation rate of a sample decreases over time, due to the elongation of the route that reagents need to go through to get to the reaction site.…”

Section: Extrapolation Of Results To Other Temperaturesmentioning

confidence: 99%

“…The oxidation rate tends to continuously decrease as the oxide layer thickness increases. Furthermore, k changes with temperature, with the dependence given by the Arrhenius equation [39]:

k = A e^{\frac{- E_{a}}{R T}}

where A is a constant (g 2 ·cm −4 ·s −1 ) and E a is activation energy (kJ/mol).…”

Section: Extrapolation Of Results To Other Temperaturesmentioning

confidence: 99%

“…The results reported in [38,39,40] clearly indicate that there are different oxidation mechanisms for different temperature ranges. In each temperature range, the activation energy is different, because E a increases with temperature.…”

Section: Extrapolation Of Results To Other Temperaturesmentioning

confidence: 99%

“…Our observations indicate that copper used for fiber coating is not chemically pure, as it gets covered with a dark layer after immersion in 5% NaOH solution for a few minutes, which does not occur with pure Cu. Furthermore, metal-coated fiber samples were repeatedly stretched during our experiment, which does not correspond to the methodology reported for weight gain measurements, where no strain is applied [38,39,40]. This factor in an evident way influences the results, since the oxide layer residing on the top of the metal coating is brittle and prone to breakage during stretching.…”

Section: Extrapolation Of Results To Other Temperaturesmentioning

confidence: 99%

See 2 more Smart Citations

New Methods of Enhancing the Thermal Durability of Silica Optical Fibers

Wysokiński¹,

Stańczyk²,

Gibala³

et al. 2014

Materials

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Microstructured optical fibers can be precisely tailored for many different applications, out of which sensing has been found to be particularly interesting. However, placing silica optical fiber sensors in harsh environments results in their quick destruction as a result of the hydrolysis process. In this paper, the degradation mechanism of bare and metal-coated optical fibers at high temperatures under longitudinal strain has been determined by detailed analysis of the thermal behavior of silica and metals, like copper and nickel. We furthermore propose a novel method of enhancing the lifetime of optical fibers by the deposition of electroless nickel-phosphorous alloy in a low-temperature chemical process. The best results were obtained for a coating comprising an inner layer of copper and outer layer of low phosphorous nickel. Lifetime values obtained during the annealing experiments were extrapolated to other temperatures by a dedicated model elaborated by the authors. The estimated copper-coated optical fiber lifetime under cycled longitudinal strain reached 31 h at 450 °C.

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Pulsed Laser Induced Triple Layer Copper Oxide Structure for Durable Polyfunctionality of Superhydrophobic Coatings

Бойнович

Emelyanenko

Domantovsky

et al. 2018

Adv Materials Inter

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anions such as chloride ions. [1,2,[4][5][6][7] This can compromise using bare copper and its alloys in technology because corrosion of copper impacts its performance in industrial and technological applications.Several ways for enhancing the corrosion protection were discussed in the literature, including the formation of thick oxide films [3,8,9] and the formation of a superhydrophobic layer atop of bulk copper. [10][11][12][13][14][15][16][17][18][19] As for oxide films on copper and copper alloys, typically the ionic state of copper can be either monovalent or divalent, associated with the formation of cuprous oxide Cu 2 O or cupric oxide CuO, respectively. In many cases, such as high temperature or anodic oxidation, the dual oxide phase formation takes place, with CuO occupying the outer and Cu 2 O the inner layers. [8,9,20,21] Such complex oxide layer has been found to be useful in improving the corrosion resistance of copper in NaCl solutions, [1,2,8,22] while the formation of a compact thick film of CuO on Cu surface prevents anodic corrosion. [23] The superhydrophobic films on metal surfaces essentially inhibit the electrochemical corrosion processes due to several protection mechanisms, such as electrolyte repellency, suppression of adsorption of aggressive ions onto the surface, barrier effect of the modified textured surface layer, and specific charging of a hydrophobic surface in electrolytes. [24,25] At the same time, for the majority of designed superhydrophobic coatings, a poor abrasive resistance restricts the practical application of these coatings. However, it was shown recently [26] that a strategy, combining the laser chemical modification of metal's surface layer and laser texturing, followed by chemisorption of low energy compounds, can be effectively used to control the mechanical and chemical properties of a superhydrophobic layer on aluminum substrate.In this study, we will demonstrate that the coatings with enhanced protective properties based on multibarrier principle can be designed on copper using the above strategy. We will show that nanosecond laser treatment in an oxygen atmosphere under appropriate laser texturing regimes followed by chemisorption of fluorooxysilane allows obtaining a thick layer of cupric oxide CuO with crystalline micro-and nanotexture and superhydrophobic properties. Triple layer copper oxide structure designed in that way allows solving the problem of durable polyfunctionality of superhydrophobic coatings. We will present Copper and its alloys are among the most used metals for the industry. However, using bare copper and its alloys in technology is compromised because corrosion and poor abrasion resistance of copper impacts its performance in industrial and technological applications. In this paper, a strategy based on combining the laser chemical modification of metal's surface in a controlled atmosphere and laser texturing, followed by chemisorption of low energy compounds is effectively used for fabrication of a superhydrophobic coating with enhanced prot...

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Brief review of oxidation kinetics of copper at 350 °C to 1050 °C

Cited by 165 publications

References 22 publications

Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity

Intriguingly high thermal conductivity increment for CuO nanowires contained nanofluids with low viscosity

New Methods of Enhancing the Thermal Durability of Silica Optical Fibers

Pulsed Laser Induced Triple Layer Copper Oxide Structure for Durable Polyfunctionality of Superhydrophobic Coatings

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