Increased Thermal Conductivity in Metal-Organic Heat Carrier Nanofluids

Nandasiri, Manjula I.; Liu, Jian; McGrail, B. Peter; Jenks, Jeromy Wj; Schaef, Herbert T.; Shutthanandan, V.; Nie, Zimin; Martin, Paul F.; Nune, Satish K.

doi:10.1038/srep27805

Cited by 24 publications

(23 citation statements)

References 53 publications

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“…Experimental data of thermal conductivity measured at room temperature for various MOFs compared to some typical inorganic materials (shadowed area). [31,32,[34][35][36]51,[110][111][112][113][114][115][116] tremendous opportunities to optimize the electronic structure for high p-and n-type ZT values via deliberate choices of metals and ligands. Besides, their structural long-range crystalline order could facilitate charge carrier mobility to enhance σ without reducing S. Furthermore, their capability to host a large variety of guest molecules and nanostructures within their pores significantly distinguishes them from other nonporous organic materials, enabling the further tunability in electronic and thermal transport characteristics.…”

Section: Design Conductive Mofs For Thermoelectric Applicationsmentioning

confidence: 99%

“…Recent studies demonstrated that materials in this class all exhibit thermal conductivities less than 0.4 W m −1 K −1 regardless of structure, composition, or morphology. [31][32][33][34][35][36] However, thermoelectric properties of MOFs have not yet been extensively investigated mainly because of the difficulty in achieving sufficiently high electrical conductivity. Generally, the connected rigid metal ions and redox-inactive organic ligands raise the energy barrier for electron transfer, making them electrical insulators.…”

Section: Introductionmentioning

confidence: 99%

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Recent Progress in Designing Thermoelectric Metal–Organic Frameworks

Fan

Liu

Chen

2021

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Thermoelectrics that enable direct heat–electricity conversion possess unique advantages for green and renewable energy revolution and have received rapidly growing attention in the past decade. Among various thermoelectric materials, metal–organic frameworks (MOFs) with intrinsic high porosity and tunable physical/chemical properties are emerging as a promising class of materials that have been demonstrated to exhibit many unique merits for thermoelectric applications. Their structural topologies and thermoelectric properties can be facilely regulated by precisely selecting and arranging metal centers and organic ligands. Besides, a large variety of guest molecules can be incorporated within their pores, giving rise to novel avenues of raising energy‐conversion efficiency. This review focuses on the recent advances in designing conductive MOFs and MOF‐based composites for thermoelectric applications. It first introduces the fundamental thermoelectric parameters and the underlying regulation mechanisms specifically effective for MOFs, then summarizes the related studies conducted in recent years, where the structural design strategies of tuning thermoelectric properties are demonstrated and discussed. In the final part, conclusions and perspectives with the envision of an outlook for this promising area are presented.

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Section: Design Conductive Mofs For Thermoelectric Applicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Progress in Designing Thermoelectric Metal–Organic Frameworks

Fan

Liu

Chen

2021

Small

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“…Several researchers have also reported improving nanofluid thermal conductivities with increasing temperature, and suggest increasing Brownian motions of the suspended nanoparticles as a possible mechanism 66 , 67 . Since increasing Brownian motions tends to promote micro-convection, which in turns enhances local mixing 68 , 69 .…”

Section: Resultsmentioning

confidence: 97%

Synthesis, characterisation and thermo-physical properties of highly stable graphene oxide-based aqueous nanofluids for potential low-temperature direct absorption solar applications

sa-ard

Fawcett

Fung

et al. 2021

Sci Rep

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Two types of highly stable 0.1% graphene oxide-based aqueous nanofluids were synthesised and investigated. The first nanofluid (GO) was prepared under the influence of ultrasonic irradiation without surfactant. The second nanofluid was treated with tetra ethyl ammonium hydroxide to reduce the graphene oxide to form reduced graphene oxide (RGO) during ultrasonic irradiation. The GO and RGO powders were characterised by various techniques such as field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Raman. Also UV–visible absorption spectroscopy was carried out and band gap energies were determined. Optical band gap energies for indirect transitions ranged from 3.4 to 4.4 eV and for direct transitions they ranged between 2.2 and 3.7 eV. Thermal conductivity measurements of the GO-based aqueous nanofluid revealed an enhancement of 9.5% at 40 °C compared to pure water, while the RGO-based aqueous nanofluid at 40 °C had a value 9.23% lower than pure water. Furthermore, the photothermal response of the RGO-based aqueous nanofluid had a temperature increase of 13.5 °C, (enhancement of 60.2%) compared to pure water, the GO-based aqueous nanofluid only displayed a temperature rise of 10.9 °C, (enhancement of 46.6%) after 20 min exposure to a solar irradiance of 1000 W m−2. Both nanofluid types displayed good long-term stability, with the GO-based aqueous nanofluid having a zeta potential of 30.3 mV and the RGO-based aqueous nanofluid having a value of 47.6 mV after 6 months. The good dispersion stability and photothermal performance makes both nanofluid types very promising working fluids for low-temperature direct absorption solar collectors.

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“…MOF‐5 composites doped with 10 wt% of expanded natural graphite show a significant enhancement (≈460%) of the thermal conductivity . Nandasiri et al found that MIL‐101(Cr) and graphene oxide composite can induce a significant increase in the thermal conductivity (≈50%) respective to the intrinsic nano MIL‐101(Cr) . In a short summary, the studies of thermal conductivity of MOF adsorbents in breakthrough experiments remain to be explored in the future.…”

Section: Mofs In Co2 Capture Practicementioning

confidence: 99%

CO₂ Capture in Metal–Organic Framework Adsorbents: An Engineering Perspective

Wang

Shah

et al. 2018

Advanced Sustainable Systems

258

185

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CO 2 emission has raised worldwide concerns because of its potential effects on climate change, species extinction, and plant nutrition deterioration. Metal-organic frameworks (MOFs) are one class of crystalline adsorbent materials that are believed to be of huge potential in CO 2 capture applications because of their advantages such as ultrahigh porosity, boundless chemical tunability, and surface functionality over traditional porous zeolites and activated carbon. In terms of chemistry, there are already many studies devoted to the synthesis of new functional MOFs. Some of the synthesized MOFs have been evaluated for CO 2 capture at laboratory-scale. Several reviews have been published on this topic, but mainly from a chemistry and materials point of view. In this review, the authors focus on the engineering perspective on this topic, with emphases on material evaluation, performance judgment, and process design to address the engineering issues of these materials to be used as adsorbents in industrial CO 2 capture. The current engineering evaluation approaches for MOFs are summarized, in a manner that could also be applied to other adsorbent materials.

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Increased Thermal Conductivity in Metal-Organic Heat Carrier Nanofluids

Cited by 24 publications

References 53 publications

Recent Progress in Designing Thermoelectric Metal–Organic Frameworks

Recent Progress in Designing Thermoelectric Metal–Organic Frameworks

Synthesis, characterisation and thermo-physical properties of highly stable graphene oxide-based aqueous nanofluids for potential low-temperature direct absorption solar applications

CO₂ Capture in Metal–Organic Framework Adsorbents: An Engineering Perspective

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Increased Thermal Conductivity in Metal-Organic Heat Carrier Nanofluids

Cited by 24 publications

References 53 publications

Recent Progress in Designing Thermoelectric Metal–Organic Frameworks

Recent Progress in Designing Thermoelectric Metal–Organic Frameworks

Synthesis, characterisation and thermo-physical properties of highly stable graphene oxide-based aqueous nanofluids for potential low-temperature direct absorption solar applications

CO2 Capture in Metal–Organic Framework Adsorbents: An Engineering Perspective

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Product

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CO₂ Capture in Metal–Organic Framework Adsorbents: An Engineering Perspective