The impacts of synthesized Ag doped ZnO nano-materials on the energy efficiency of the refrigeration system

Akkaya, Mustafa; Yurtdaş, Semih

doi:10.1177/09544089221094091

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…Several techniques have been reported for the fabrication of nanocomposites. However, some processes may take too long and require several steps to achieve the final nanocomposite structures [15], very high voltages [1], high temperatures [15,16], the use of expensive precursors or several steps [17], sophisticated and exclusive synthesis equipment [18], etc. Another problem is the generation of hazardous waste from some chemical techniques that need several washes to clean the nanocomposite [19].…”

Section: Introductionmentioning

confidence: 99%

Simple two-step synthesis of Ag/ZnO nanoparticles with enhanced photocatalytic response

Flores-Castañeda,

Meza,

Guevara-Martínez

et al. 2024

Mater. Res. Express

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This study presents a simple two-step synthesis method for the fabrication of Ag/ZnO nanocomposites to improve the photocatalytic response of ZnO. The synthesis involves ZnO nanoparticles that were fabricated from the thermal decomposition of commercial zinc acetate. In order to produce Ag/ZnO nanoparticles in a simple two-step process, ZnO nanoparticles were mixed with Ag nanoparticle suspensions previously obtained by the laser ablation of solids in liquids technique at three different fluences. Structural characterization of ZnO powders revealed the presence of single phase wurtzite ZnO nanoparticles with crystal sizes of 20 nm. On the other hand, XRD patterns for a composite sample revealed the presence of signals associated to both ZnO and Ag suggesting that silver nanoparticles were attached to the ZnO particles surface. Optical characterization of the ZnO powders, carried out by UV-Vis spectroscopy, showed a strong absorption band centered at 380 nm, which is associated to excitonic transitions in ZnO nanoparticles, whilst absorption measurements of silver nanoparticles colloids revealed the presence of a strong band centered near 412 nm. This band shifts to shorter wavelengths with increasing fluence from 2.6 to 6.2 J/cm2, indicating changes in nanoparticles size. Photocatalytic degradation tests of methylene blue under UV irradiation were carried out using pure ZnO, Ag colloids and Ag/ZnO nanoparticles. After the first 30 minutes of irradiation, it was observed that the silver nanoparticles reached degradation percentages of 16, 22 and 29 % for samples synthesized at 2.6, 4.2 and 6.2 J/cm2, respectively. Meanwhile the ZnO sample reached a value of 13 % after 30 minutes. Regarding the Ag/ZnO composite sample, the percentage of degradation after 30 minutes was 36%, demonstrating a considerable enhanced photocatalytic activity as compared to ZnO. After 24h irradiation, Ag/ZnO degraded 95% of the methylene blue solution. It was observed that decorating ZnO with laser produced silver nanoparticles accelerates the photocatalytic response of ZnO by enhancing the activity at short times. 

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Section: Introductionmentioning

confidence: 99%

Simple two-step synthesis of Ag/ZnO nanoparticles with enhanced photocatalytic response

Flores-Castañeda,

Meza,

Guevara-Martínez

et al. 2024

Mater. Res. Express

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“…Moreover, several authors have operated on nanofluid theoretically and experimentally. 15–25 Hence, these efforts lead to an enhanced heat transfer rate. Also, many different methods have been used to improve the rate of heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of inclined MHD and Joule effects in Ti-alloy and MWCNT/water hybrid nanofluid: Flow separation

RamReddy

Saran

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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This research article explains the Joule heating and inclined magnetic field effects on Ti6Al4V-MWCNT/[Formula: see text] hybrid nanofluids toward an exponentially shrinking surface. The system of flow governing equations, which is a coupled system of non-linear PDE’s, are transformed into a system of non-dimensional ODE’s by using suitable similarity transformations. The shooting method along with a fourth order Runge-Kutta approach is used to solve the system of resultant ODE’s. As a result, the dual solutions are identified for this problem. By utilizing the least eigenvalue approach, the first solution is found to be realistic and stable whereas the second solution is not stable. In order to verify the accuracy of outcomes, it is compared with the previously published results, and it is found that the present analysis is accurate upto four decimal places. Further, the streamline profiles are also provided in addition to the least eigenvalue profiles to understand the flow patterns. Finally, the flow separation point is identified. The velocity profiles improves in the case of first solution but it declines in the case of second solution with a rise in the shrinking strength parameter, however the temperature profiles behave in opposite manner. The skin friction coefficient and heat transfer rate of Ti6Al4V-MWCNT/[Formula: see text] based hybrid nanofluids are found to be better with higher values of inclined MHD [Formula: see text] and incline angle [Formula: see text].

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The impacts of synthesized Ag doped ZnO nano-materials on the energy efficiency of the refrigeration system

Cited by 2 publications

References 36 publications

Simple two-step synthesis of Ag/ZnO nanoparticles with enhanced photocatalytic response

Simple two-step synthesis of Ag/ZnO nanoparticles with enhanced photocatalytic response

Stability analysis of inclined MHD and Joule effects in Ti-alloy and MWCNT/water hybrid nanofluid: Flow separation

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