A highly stable hydroxylated graphene/ethylene glycol-water nanofluid with excellent extinction property at a low loading for direct absorption solar collectors

Huang, Jiawu; Chen, Zhaofeng; Du, Zhiqing; Xu, Xinxin; Zhang, Zhengguo; Fang, Xiaoming

doi:10.1016/j.tca.2019.178487

Cited by 26 publications

(10 citation statements)

References 27 publications

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“…From 200 nm, the values fell desperately to 800 nm for the studied MXene concentrations. The obtained results were in good agreement with previous literature [3].…”

Section: Light Absorption Spectra Of the Mxene Based Ionanofluidsupporting

confidence: 93%

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Investigation of Electrical Conductivity, Optical Property, and Stability of 2D MXene Nanofluid Containing Ionic Liquids

et al. 2020

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The addition of ionic liquids with MXene nanofluid has a substantial impact on the solar thermal collectors’ working fluid’s optical properties that effectively absorb and distribute solar radiation. Increased solar radiation absorption potential ensures that heats are transported more rapidly and effectively. This research endeavors to investigate the concept of accumulating solar energy via the usage of ionic liquid-based 2D MXene nanofluid (Ionanofluids) for solar applications. In this study, the optical potential of Diethylene Glycol/MXene nanofluid incorporated with 1-ethyl-3-methyl imidazolium octyl sulfate ([Emim][OSO4]) ionic liquid was extensively investigated with respect to MXene concentration (0.1 to 0.4 wt%) and time (first day and seventh day) through UV-Vis Spectroscopy. A two-step approach was employed to synthesize the proposed ionanofluids with nanoparticle concentrations from 0.1 to 0.4 wt%. In wavelengths between 240 to 790 nm, the effect of ionic liquids, MXene concentration, and dispersion stability played a significant part in enhancing the absorbance capacity of the formulated MXene based Ionanofluid. Furthermore, the increase in the concentration of MXene nanoparticles resulted in more absorbance peaks facilitating high light absorption. Finally, the electrical conductivity of the ionanofluids is also analyzed as MXene renders them promising for solar cell applications. The utmost electrical conductivity of the formulated fluids of 571 μS/cm (micro siemens per centimeter) was achieved at 0.4 wt% concentration.

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“…From 200 nm, the values fell desperately to 800 nm for the studied MXene concentrations. The obtained results were in good agreement with previous literature [3].…”

Section: Light Absorption Spectra Of the Mxene Based Ionanofluidsupporting

confidence: 93%

“…When a chargeis applied, these nanoparticles migrate effectively to the oppositely charged electrode leading to high electrical conductivity. Poongavanam et al [3] reported a comprehensive review of nanofluidselectrical conductivity in recent applications.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electrical Conductivity, Optical Property, and Stability of 2D MXene Nanofluid Containing Ionic Liquids

et al. 2020

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“…Therefore, nanofluids are promising alternatives to the commonly used fluids in DASCs. 11,12 Various nanoparticles, ranging from carbon materials (such as graphene, 13,14 carbon black, 15 carbon nanotube, 16,17 and graphite 18 ), metals (such as Cu, 19 Ag, 20 and Au 21 ), metal oxides (such as Fe 3 O 4, 22 CuO, 23,24 and TiO 2 25 ), carbides (such as SiC 26 and ZrC 27 ), and nitrides (such as BN 28 and TiN 29 ), have been evaluated for light absorption enhancement. However, a mono nanoparticle can usually improve the absorption in a certain bandwidth of the solar spectrum, leading to limited performance enhancement.…”

Section: Introductionmentioning

confidence: 99%

Photo‐thermal conversion performance of mono MWCNT and hybrid MWCNT‐TiN nanofluids in direct absorption solar collectors

Zheng

Yan

Long

et al. 2022

Intl J of Energy Research

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Summary Solar energy is being widely investigated due to its abundant, renewable, and clean features. Photo‐thermal conversion in solar collectors is a direct approach for harvesting solar energy. Compared to the commonly used surface‐based solar collectors (SSCs), nanofluid‐based direct absorption solar collectors (DASCs) are more efficient. In this work, water‐based mono MWCNT and hybrid MWCNT‐TiN nanofluids were prepared through a two‐step method, aiming at light absorption enhancement of nanofluids for applications in DASCs. The optical and photo‐thermal conversion performance of the MWCNT nanofluids was firstly evaluated. The results showed that the MWCNT nanofluids presented high solar absorption capability, and the highest photo‐thermal conversion efficiency was obtained at 10 ppm. The TiN nanoparticles were subsequently incorporated to form the hybrid MWCNT‐TiN nanofluids. The absorption performance of the hybrid nanofluids was further enhanced. The highest efficiency of the hybrid MWCNT‐TiN nanofluids was achieved at the TiN mass fraction of 10 ppm, which was about 6.9%, 6.0%, and 3.8% higher than that of the MWCNT nanofluid at 2000, 4000, and 6000 seconds due to the localized surface plasmon resonance (LSPR) effect of TiN nanoparticles. It was also found that the collector efficiency dropped rapidly with the prolonged irradiation time owing to the convection and radiation heat loss at the elevated temperature. Therefore, effective measures should also be taken to reduce heat loss to maintain high photo‐thermal conversion efficiency.

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“…The technical problems encountered in electrokinetic studies of dispersions in mixed solvents, especially in terms of the relationship between zeta potential and stability, were discussed in a recent paper [ 5 ]. In our opinion, the following problems have not received sufficient attention in previous studies [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]: The calculation of zeta potential from electrophoretic mobility is not straightforward. The relationship between zeta potential and stability is complicated.…”

Section: Introductionmentioning

confidence: 99%

“…Different solvent compositions were studied, but 50-50 EG–water [ 9 , 10 , 11 , 12 , 13 ] seems to be the most popular one. Therefore, we chose 50-50 EG–water mixture as the solvent in our study.…”

Section: Introductionmentioning

confidence: 99%

Electric Double Layer in Water-Organic Mixed Solvents: Titania in 50% Ethylene Glycol

Kosmulski

Mączka

2022

Molecules

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Ethylene glycol (EG) and its mixtures with water are popular components of nanofluids used as heat transfer fluids. The stability of nanofluids against coagulation is correlated with their zeta potential. The electrophoretic mobility of titania nanoparticles in 50-50 w/w EG was studied as a function of the concentration of various solutes. HCl, NaOH, SDS and CTMABr at concentrations up to 0.01 M are strong electrolytes in 50% EG, that is, the conductance of their solutions is proportional to the concentration. HCl, NaOH and CTMABr were very efficient in inducing a high zeta potential for titania in 50% EG. NaOH induced a negative zeta potential in excess of 70 mV, and HCl and CTMABr induced a positive zeta potential in excess of 70 mV at concentrations below 10−4 M. Apparently, HCl, NaOH and CTMABr are also more efficient than SDS in terms of nanofluid stabilization against coagulation. An overdose of base (>1 mM) results in depression of the negative zeta potential. This result may be due to the specific adsorption of sodium on titania from 50% EG.

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A highly stable hydroxylated graphene/ethylene glycol-water nanofluid with excellent extinction property at a low loading for direct absorption solar collectors

Cited by 26 publications

References 27 publications

Investigation of Electrical Conductivity, Optical Property, and Stability of 2D MXene Nanofluid Containing Ionic Liquids

Investigation of Electrical Conductivity, Optical Property, and Stability of 2D MXene Nanofluid Containing Ionic Liquids

Photo‐thermal conversion performance of mono MWCNT and hybrid MWCNT‐TiN nanofluids in direct absorption solar collectors

Electric Double Layer in Water-Organic Mixed Solvents: Titania in 50% Ethylene Glycol

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