Improvement of photo-thermal energy conversion performance of MWCNT/Fe3O4 hybrid nanofluid compared to Fe3O4 nanofluid

Tong, Yijie; Boldoo, Tsogtbilegt; Mr, Jeonggyun Ham; Cho, Honghyun

doi:10.1016/j.energy.2020.117086

Cited by 91 publications

(43 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MWCNTs are cylindrical nanoparticles combined with multiple graphene layers with their shapes, sizes, and unusual physical properties. In addition, MWCNTs act as a scaffold for the insertion of many metal nanoparticles due to their large surface area 40 – 42 . The ratios of I D /I G for NiCu@MWCNT nanohybrids and MWCNT were found to be 1.38 and 1.22, respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of benzylidenemalononitrile by Knoevenagel condensation through monodisperse carbon nanotube-based NiCu nanohybrids

Zengin

Burhan

Şavk

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Monodisperse nickel/copper nanohybrids (nicu@MWcnt) based on multi-walled carbon nanotubes (MWcnt) were prepared for the Knoevenagel condensation of aryl and aliphatic aldehydes. the synthesis of these nanohybrids was carried out by the ultrasonic hydroxide assisted reduction method. nicu@MWcnt nanohybrids were characterized by analytical techniques such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (teM), high-resolution transmission electron microscopy (HR-teM), and Raman spectroscopy. According to characterization results, nicu@MWcnt showed that these nanohybrids form highly uniform, crystalline, monodisperse, colloidally stable nicu@MWcnt nanohybrids were successfully synthesized. thereafter, a model reaction was carried out to obtain benzylidenemalononitrile derivatives using nicu@MWcnt as a catalyst, and showed high catalytic performance under mild conditions over 10-180 min. Benzylidenemalononitrile (BMN) derivatives are frequently used as both a target molecule and an intermediate molecule in organic chemistry. BMN derivatives have attracted many scientists' attention because of some unique properties such as anticancer 1-3 , antifungal 4,5 , antibacterial 6-9 , anti-corrosive 10. BMN derivatives are used to increase cell resistance in the case of oxidative stress 11 , in prostaglandin biosynthesis 12 , in the design of photoconductive cells 13 and the inhibition/activation of certain enzymes 14,15. Typically, BMN derivatives are synthesized by the Knoevenagel condensation of aldehydes with active methylene compounds (Fig. 1) 16-22. In these processes, it is seen that it has an effect on homogeneous catalysts. Heterogeneous catalysts have various advantages such as minimum availability, recovery, reusability, structural deterioration resistance and leaching of metal values 23-28. Bimetallic heterogeneous catalysts, in particular, have greatly facilitated the Knoevenagel condensation reaction 29-34. In literature, many catalysts such as SBA-15 (highly stable mesoporous silica) 35 , Sr 3 Al 2 O 6 nanoparticles 36 , bifunctional MIL-101(Cr) 37 , Fe 3 O 4 @SiO 2 nanoparticles 38 and Mn-MOF@Pi 39 have been used in condensation reactions. Herein we report an eco-friendly and practical method for the synthesis of highly efficient, cost-effective, and monodisperse bimetallic NiCu@MWCNT nanohybrids for the Knoevenagel condensation reaction under mild conditions. BMN derivatives have been successfully obtained in a very short time (10-180 min) using the developed method in the water-containing solvent system. experimental chemicals. NiCl 2 , CuCl 2 , NaBH 4 , aminoborane aryl azides, acetonitrile (ACN), lithium perchlorate (LiClO 4), 3,4-ethylene dioxythiophene (EDOT), multiwall carbon nanotubes, NN-Dimethylformamide (DMF), sulfuric acid, hydrochloric acid, and nitric acid were purchased from Sigma-Aldrich. Tetrahydrofuran (THF; 99.5%), HClO 4 (60%), 2-propanol, and Methanol (≥ 99.5%) were obtained from Merck. All test materials and other

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis of benzylidenemalononitrile by Knoevenagel condensation through monodisperse carbon nanotube-based NiCu nanohybrids

Zengin

Burhan

Şavk

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…However, nanofluids have a much lower transmittance than pure water in the wavelength range of 250-1370 nm, as shown in Figure 8. By introducing representative studies related to the optical properties of nanofluids, Tong et al [39] and Shin et al [41] experimentally investigated the optical transmittance of Fe3O4, multi-walled carbon nanotubes (MWCNTs), and MWCNT/Fe3O4 hybrid nanofluids. In their experiments, the maximum optical transmittance of the Fe3O4 nanofluid decreased by approximately 5% when the nanofluid concentration increased from 0 to 0.005 wt% at a wavelength of 750 nm.…”

Section: Optical Properties Of Nanofluidsmentioning

confidence: 99%

“…The photothermal energy conversion efficiency of the Ag-Au/ZNG nanofluid was 74.35% and 38.71% at concentrations of 100 and 10 ppm, respectively. Tong et al [39] experimentally investigated the photothermal energy conversion performance and efficiency of Fe 3 O 4 and hybrid MWCNT/Fe 3 O 4 nanofluids at different weight mixing ratios such as 1/4, 2/3, 3/2, and 4/1. Their photothermal energy conversion experiment consisted of two stages: a heating stage and an energy-absorbing stage.…”

Section: Photothermal Energy Conversion Performance Of Nanofluidsmentioning

confidence: 99%

Review of the Photothermal Energy Conversion Performance of Nanofluids, Their Applications, and Recent Advances

et al. 2020

Self Cite

View full text Add to dashboard Cite

Nanoparticles have been thoroughly investigated in the last few decades because they have many beneficial and functional qualities. Their capability to enhance and manipulate light absorption, thermal conductivity, and heat transfer efficiency has attracted significant research attention. This systematic and comprehensive work is a critical review of research on the photothermal energy conversion performance of various nanofluids as well as the recent advances in several engineering applications. Different nanofluids used in the photothermal energy conversion process were compared to identify the suitable applications of each nanofluid in thermal systems. An analysis of the previous investigations based on experimental and numerical studies has established that nanomaterials have the potential to increase the efficiency of solar thermal systems.

show abstract

“…Ahmed Kadhim Hussein states the utilization of nanoparticles is instrumental in improving the efficiency of fuel cells, solar cells, and wind turbine 9 . Similarly, use of nanoparticles (<100 nm) in heat transfer fluids employed in solar collectors can significantly increase their overall efficiency 10‐13 …”

Section: Introductionmentioning

confidence: 99%

“…9 Similarly, use of nanoparticles (<100 nm) in heat transfer fluids employed in solar collectors can significantly increase their overall efficiency. [10][11][12][13] Solar collectors are a distinct class of heat exchangers capable of absorbing the incoming solar radiations for further transferring to the fluid which flows inside the receiver tubes. The solar collector performance depends upon heat transfer processes of the working fluid.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on thermal conductivity of mono and hybrid Al ₂ O ₃ –TiO ₂ nanofluids for concentrating solar collectors

2020

View full text Add to dashboard Cite

Summary Hybrid nanofluids with Therminol‐55 as base fluid and TiO2 and Al2O3 as nano additives are investigated for parabolic trough collectors. Stable mono nanofluids based on Therminol‐55 with Al2O3 and TiO2 nanoparticles, and hybrid Al2O3–TiO2 nanopowder as additives are prepared by the two‐step method. Oleic acid has been made as a surfactant. The impact of nanoparticle content and fluid temperature on thermal conductivity was studied using the transient hot‐wire technique. Thermal conductivity exhibited an increase with an increase in both temperature and nanoparticle concentration. Al2O3–TiO2 Therminol‐55 hybrid nanofluids exhibit the highest increase of 33.5% in thermal conductivity followed by 27.06% in Al2O3–Therminol‐55, and lowest rise of 21% is found in TiO2–Therminol‐55 nanofluids. Synergetic effect of Al2O3 and TiO2 nanoparticles, increased Brownian motion, and filling of vacant spaces by smaller‐sized TiO2 nanoparticles in Al2O3–TiO2 hybrid nanofluids lead to effective thermal network for enhanced thermal conductivity. Maximum thermal conductivity of 0.15 W/m‐K is observed in the case of hybrid Al2O3–TiO2 Therminol‐55 nanofluid with 0.5 wt% concentration. Augmented thermal conductivity of HNF's leads to the efficient photothermal conversion in concentrating solar collectors. Further, a correlation for thermal conductivity with variation in nanoparticle content and the fluid temperature is proposed with R2 = 0.92.

show abstract

Improvement of photo-thermal energy conversion performance of MWCNT/Fe3O4 hybrid nanofluid compared to Fe3O4 nanofluid

Cited by 91 publications

References 47 publications

Synthesis of benzylidenemalononitrile by Knoevenagel condensation through monodisperse carbon nanotube-based NiCu nanohybrids

Synthesis of benzylidenemalononitrile by Knoevenagel condensation through monodisperse carbon nanotube-based NiCu nanohybrids

Review of the Photothermal Energy Conversion Performance of Nanofluids, Their Applications, and Recent Advances

Experimental study on thermal conductivity of mono and hybrid Al ₂ O ₃ –TiO ₂ nanofluids for concentrating solar collectors

Contact Info

Product

Resources

About

Improvement of photo-thermal energy conversion performance of MWCNT/Fe3O4 hybrid nanofluid compared to Fe3O4 nanofluid

Cited by 91 publications

References 47 publications

Synthesis of benzylidenemalononitrile by Knoevenagel condensation through monodisperse carbon nanotube-based NiCu nanohybrids

Synthesis of benzylidenemalononitrile by Knoevenagel condensation through monodisperse carbon nanotube-based NiCu nanohybrids

Review of the Photothermal Energy Conversion Performance of Nanofluids, Their Applications, and Recent Advances

Experimental study on thermal conductivity of mono and hybrid Al 2 O 3 –TiO 2 nanofluids for concentrating solar collectors

Contact Info

Product

Resources

About

Experimental study on thermal conductivity of mono and hybrid Al ₂ O ₃ –TiO ₂ nanofluids for concentrating solar collectors