Nanodiamond nanofluid microstructural and thermo-electrical characterization

Mashali, Farzin; Languri, Ethan; Mirshekari, Gholamreza; Davidson, J.L.; Kerns, D.V.

doi:10.1016/j.icheatmasstransfer.2019.01.007

Cited by 42 publications

(32 citation statements)

References 31 publications

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“…A possible explanation for this is that although the surface area of the nanoparticles is increased, correspondingly the attractive forces between them are also increased causing their zeta potential to deteriorate. Similar trends were noticed in previous findings [ 68 , 69 ]. The effect of temperature on zeta potential value is also significant.…”

Section: Resultssupporting

confidence: 92%

Improved Thermophysical Properties and Energy Efficiency of Aqueous Ionic Liquid/MXene Nanofluid in a Hybrid PV/T Solar System

et al. 2020

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In recent years, solar energy technologies have developed an emerging edge. The incessant research to develop a power source alternative to fossil fuel because of its scarcity and detrimental effects on the environment is the main driving force. In addition, nanofluids have gained immense interest as superior heat transfer fluid in solar technologies for the last decades. In this research, a binary solution of ionic liquid (IL) + water based ionanofluids is formulated successfully with two dimensional MXene (Ti3C2) nano additives at three distinct concentrations of 0.05, 0.10, and 0.20 wt % and the optimum concentration is used to check the performance of a hybrid solar PV/T system. The layered structure of MXene and high absorbance of prepared nanofluids have been perceived by SEM and UV–vis respectively. Rheometer and DSC are used to assess the viscosity and heat capacity respectively while transient hot wire technique is engaged for thermal conductivity measurement. A maximum improvement of 47% in thermal conductivity is observed for 0.20 wt % loading of MXene. Furthermore, the viscosity is found to rise insignificantly with addition of Ti3C2 by different concentrations. Conversely, viscosity decreases substantially as the temperature increases from 20 °C to 60 °C. However, based on their thermophysical properties, 0.20 wt % is found to be the optimum concentration. A comparative analysis in terms of heat transfer performance with three different nanofluids in PV/T system shows that, IL+ water/MXene ionanofluid exhibits highest thermal, electrical, and overall heat transfer efficiency compared to water/alumina, palm oil/MXene, and water alone. Maximum electrical efficiency and thermal efficiency are recorded as 13.95% and 81.15% respectively using IL + water/MXene, besides that, heat transfer coefficients are also noticed to increase by 12.6% and 2% when compared to water/alumina and palm oil/MXene respectively. In conclusion, it can be demonstrated that MXene dispersed ionanofluid might be great a prospect in the field of heat transfer applications since they can augment the heat transfer rate considerably which improves system efficiency.

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Section: Resultssupporting

confidence: 92%

Improved Thermophysical Properties and Energy Efficiency of Aqueous Ionic Liquid/MXene Nanofluid in a Hybrid PV/T Solar System

et al. 2020

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“…This can be also due to the values registered for each base fluid electrical conductivity (see Table 2 and [41,51,55,56]). For example, water (with a medium electrical conductivity of 5.5 µS/cm [39,42]) has 10 times higher electrical conductivity if compared to EG, while BG electrical conductivity values reach 45 µS/cm [56].…”

Section: Discussion On Experimental Resultsmentioning

confidence: 99%

“…Studies on temperature variation influence over electrical conductivity are summarized in Table 3. The overall conclusion was that the temperature increase leads to a linear increase in the electrical conductivity [24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57] which is a logical phenomenon with major occurrence in the physics of suspensions. Some details are already presented in both Table 1 and Section 3 and a discussion will be undertaken below.…”

Section: Discussion On Experimental Resultsmentioning

confidence: 99%

“…Mashali et al [39] studied the nanodiamond water based nanofluids in three concentrations up to 0.25 wt.% and performed a comparison with existing literature. Outcomes concluded that adding nanodiamond obtains the minimum electrical conductivity if compared with other nanoparticle types.…”

Section: Literature Overviewmentioning

confidence: 99%

“…Comparison of electrical conductivity values for 0.01% nanofluid with different types of nanoparticles dispersed in water [36,39]. …”

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

A Review on Electrical Conductivity of Nanoparticle-Enhanced Fluids

Minea

2019

Nanomaterials

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This review discusses exclusively the recent research on electrical conductivity of nanofluids, correlations and mechanisms and aims to make an important step to fully understand the nanofluids behavior. Research on nanoparticle-enhanced fluids’ electrical conductivity is at its beginning at this moment and the augmentation mechanisms are not fully understood. Basically, the mechanisms for increasing the electrical conductivity are described as electric double layer influence and increased particles’ conductance. Another idea that has resulted from this review is that the stability of nanofluids can be described with the help of electrical conductivity tests, but more coordinated research is needed. The purpose of this article is not only to describe the aforementioned studies, but also to fully understand nanofluids’ behavior, and to assess and relate several experimental results on electrical conductivity. Concluding, this analysis has shown that a lot of research work is needed in the field of nanofluids’ electrical characterization and specific applications.

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Nanodiamond‐Agarose Gels for Effective Photothermal Heating

Rashwan,

Baskaran,

Burda

2023

Adv Funct Materials

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Experimental investigation of the photothermal properties of carboxylated nanodiamond (ND) particles in agarose gel base medium over a range of very low particle concentrations from 6.55 × 10−5 to 2.29 × 10−2% v/v and two different sizes (35 and 160 nm) is carried out. Laser‐induced spot heating of gels with trace amounts of ND particles lead to a very large increase in temperatures away from the spot compared to base gels. These increases are inconsistent with any thermal conductivity increases associated with the incorporation of particles. UV‐visible and Raman spectroscopy investigation demonstrates that this photothermal phenomenon is attributed to particle concentrations and size‐dependent changes in optical scattering/entrapment of nanoparticle‐laden gels. Structural investigation of the gels suggests that ND particles associate with the agarose polymer structure which leads to increased optical scattering and entrapment in particle‐laden gels. Collectively, it is concluded that combining trace amounts of nanodiamond particles in agarose gels dramatically affect the light scattering and entrapment properties of the nanoparticle‐laden gels, subsequently influencing the photothermal conversion efficiency of the system. This effect arises from the synergistic modification of the gel by the nanodiamond particle addition, rather than the independent effects of nanoparticles or the gel alone.

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Nanodiamond nanofluid microstructural and thermo-electrical characterization

Cited by 42 publications

References 31 publications

Improved Thermophysical Properties and Energy Efficiency of Aqueous Ionic Liquid/MXene Nanofluid in a Hybrid PV/T Solar System

Improved Thermophysical Properties and Energy Efficiency of Aqueous Ionic Liquid/MXene Nanofluid in a Hybrid PV/T Solar System

A Review on Electrical Conductivity of Nanoparticle-Enhanced Fluids

Nanodiamond‐Agarose Gels for Effective Photothermal Heating

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