Thermo-optical properties of copper oxide nanofluids for direct absorption of solar radiation

Karami, Maryam; Akhavan-Behabadi, M.A.; Dehkordi, Mehrdad Raisee; Delfani, Shahram

doi:10.1016/j.solmat.2015.08.018

Cited by 145 publications

(35 citation statements)

References 30 publications

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“…Karami et al . had studied the thermo-optical properties of CuO nanofluids for direct absorption of solar radiation, and got about a 13.7% thermal conductivity increase in the base fluid (distilled water:ethylene glycol = 7:3) 32 . Peterson et al .…”

Section: Resultsmentioning

confidence: 99%

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

Zhu

Wang

et al. 2018

Sci Rep

127

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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: 99%

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

Zhu

Wang

et al. 2018

Sci Rep

127

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“…15 Among various Cu based materials, copper oxide (CuO) is one of the simplest and industrially important semiconductor materials belonging to the monoclinic structure system with a narrow bandgap energy of 1.2 eV. 16 Because of the potential applications in various elds, 8,[17][18][19] CuO nanostructures with various sizes and morphologies have been prepared via several methods such as sonochemical, 20 solvothermal, 21 hydrothermal, 11 thermal decompositions, 22 electrochemical 15,23 and sol-gel method. 24,25 However, the use of expensive and toxic chemicals in the form of either stabilizing or capping agent in most of these methods limits their use in a wider range as they are neither eco-friendly nor environment-friendly.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of CuO nanoparticles using Lantana camara flower extract and their potential catalytic activity towards the aza-Michael reaction

2020

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Aza-Michael addition is one of the most exploited reactions in organic chemistry. It is regarded as one of the most popular and efficient methods for the creation of the carbon-nitrogen bond, which is a key feature of many bioactive molecules. Herein, we report the synthesis of CuO nanoparticles by an alkaline hydrolysis process in the presence of the flower extract of Lantana camara, an invasive weed, followed by calcination in air at 400 C. Microscopic results indicated that the plant extract played an important role in the modulation of the size and shape of the product. In the presence of extract, porous CuO nanostructures are formed. While mostly aggregated rod-shaped CuO nanostructures are formed in the absence of extract. The products are pure and highly crystalline possessing the monoclinic phase. The CuO nanoparticles have been used as a catalyst in the aza-Michael addition reaction in aqueous medium under ultrasound vibration. The product yield is excellent and the catalyst is reusable up to the fifth cycle. The catalyst system can be extended to various substituted substrates with excellent to moderate yields.

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“…The micro-/nano-sized particles are widely used in numerous fields, including material science, chemical engineering, biotechnology, and atmospheric aerosol science, etc [1][2][3]. In recent years, the micro-/nanoparticles have attracted significant interests for their potential applications in solar energy harvesting [4][5][6][7][8][9][10][11]. The knowledge of the radiative properties, such as extinction, absorption and scattering coefficients, and the scattering phase function, is crucial to analyze radiative transfer in the liquid-particle suspensions [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Improved transmission method for measuring the optical extinction coefficient of micro/nano particle suspensions

Zhao

Wang

et al. 2016

Appl. Opt.

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Received XX Month XXXX; revised XX Month, XXXX; accepted XX Month XXXX; posted XX Month XXXX (Doc. ID XXXXX); published XX Month XXXXExtinction coefficient is fundamental to analyze radiative transport in micro/nano particle suspensions. In the traditional transmission method for measuring the extinction coefficient of particles in a cuvette, a reference system is used to compensate the influence of the cuvette and base fluid. However, the multiple reflections and refractions between the air/glass and liquid/glass interfaces cannot be sufficiently eliminated by using the reference system, and the induced measurement error increases significantly with increasing difference in refractive index between two neighboring media at these interfaces. In this paper, an improved transmission method is proposed to measure the extinction coefficient of micro/nano particles. The extinction coefficient of the particles is determined based on an optical model taking into account the multiple reflection and refraction at the glass/liquid interfaces. An experimental validation was conducted for suspensions with various mean particle sizes. By considering the higherorder transmission terms, the improved transmission method generally achieved high accuracy improvement over the traditional transmission method for extinction coefficient measurement, especially for the case with small optical thickness of particle suspensions. This work provides an alternative and more accurate way for measuring the extinction characteristics of micro/nano particle suspensions.

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Thermo-optical properties of copper oxide nanofluids for direct absorption of solar radiation

Cited by 145 publications

References 30 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

Green synthesis of CuO nanoparticles using Lantana camara flower extract and their potential catalytic activity towards the aza-Michael reaction

Improved transmission method for measuring the optical extinction coefficient of micro/nano particle suspensions

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