High Performance of Carbon Nanotube Refrigerators

Cantuário, Tiago Enrique; Fonseca, Alexandre F.

doi:10.1002/andp.201800502

Cited by 14 publications

(13 citation statements)

References 21 publications

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“…Note that the scaling method discussed above has been also used in exploring the eC effect of CNTs and graphene. [32,78] We also estimate the eC effect under given stress values based on indirect Maxwell relations to further verify the results from MD simulations. The isothermal entropy changes ΔS and adiabatic temperature change ΔT associated with the eC effect are estimated as [6] ∫…”

Section: Corrections To Adiabatic Temperature Changementioning

confidence: 84%

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Room‐Temperature Colossal Elastocaloric Effects in Three‐Dimensional Graphene Architectures: An Atomistic Study

Zhao

Guo

Zhang

2022

Adv Funct Materials

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Solid‐state cooling exploits the thermal response of caloric materials when subjected to external physical fields and represents a promising alternative to conventional refrigeration technologies. However, existing caloric materials are often limited by relatively small caloric response and hysteresis issues rooted in first‐order structural transitions. Here, colossal and reversible elastocaloric effects near room temperature in superelastic graphene architectures are predicted by thermodynamic analysis and atomistic calculations. The estimated adiabatic temperature change can reach a value of 155 K under a compressive stress of 0.7 GPa in a wide temperature range of around 300 K, yielding outstanding elastocaloric strength and efficiency. More unique is that both cooling and warming can be realized in the materials by applying tensile and compressive strains to host conventional and inverse elastocaloric effects, respectively, with almost no fatigue behavior and hysteresis effect. Such unprecedented elastocaloric performance results from a strain‐induced large change in configurational entropy in the graphene architectures. These effects are potentially extendable to other superelastic nanomaterials and hence suggest new material settings for developing high‐performance solid‐state refrigerants.

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Section: Corrections To Adiabatic Temperature Changementioning

confidence: 84%

“…Note that the scaling method discussed above has been also used in exploring the eC effect of CNTs and graphene. [ 32,78 ]…”

Section: Resultsmentioning

confidence: 99%

Room‐Temperature Colossal Elastocaloric Effects in Three‐Dimensional Graphene Architectures: An Atomistic Study

Zhao

Guo

Zhang

2022

Adv Funct Materials

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“…Since carbon-based nanofluids (i.e., ND, graphene, CNTs, etc.) have better performance due to their superior features compared to other known nanomaterials [ 17 , 406 , 412 , 413 , 414 , 415 , 416 , 417 , 418 ], they could result in significant system performance improvement. Therefore, researchers have further investigated carbon-based nanoparticles for various AC&R applications [ 419 ], such as the ones demonstrated in Figure 23 .…”

Section: Thermal Applicationsmentioning

confidence: 99%

Carbon-Based Nanofluids and Their Advances towards Heat Transfer Applications—A Review

et al. 2021

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Nanofluids have opened the doors towards the enhancement of many of today’s existing thermal applications performance. This is because these advanced working fluids exhibit exceptional thermophysical properties, and thus making them excellent candidates for replacing conventional working fluids. On the other hand, nanomaterials of carbon-base were proven throughout the literature to have the highest thermal conductivity among all other types of nanoscaled materials. Therefore, when these materials are homogeneously dispersed in a base fluid, the resulting suspension will theoretically attain orders of magnitude higher effective thermal conductivity than its counterpart. Despite this fact, there are still some challenges that are associated with these types of fluids. The main obstacle is the dispersion stability of the nanomaterials, which can lead the attractive properties of the nanofluid to degrade with time, up to the point where they lose their effectiveness. For such reason, this work has been devoted towards providing a systematic review on nanofluids of carbon-base, precisely; carbon nanotubes, graphene, and nanodiamonds, and their employment in thermal systems commonly used in the energy sectors. Firstly, this work reviews the synthesis approaches of the carbon-based feedstock. Then, it explains the different nanofluids fabrication methods. The dispersion stability is also discussed in terms of measuring techniques, enhancement methods, and its effect on the suspension thermophysical properties. The study summarizes the development in the correlations used to predict the thermophysical properties of the dispersion. Furthermore, it assesses the influence of these advanced working fluids on parabolic trough solar collectors, nuclear reactor systems, and air conditioning and refrigeration systems. Lastly, the current gap in scientific knowledge is provided to set up future research directions.

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“…AIREBO is a well-known reactive empirical potential, largely used to study the mechanical [45][46][47][48][49][50][51] and thermal properties [52][53][54][55][56][57] of carbon nanostructures. The protocols of simulations are given as follows.…”

Section: Simulationsmentioning

confidence: 99%

Twisting or untwisting graphene twisted nanoribbons without rotation

Fonseca

2021

Phys. Rev. B

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Graphene nanoribbons (GNRs) have the most of the outstanding properties of pristine graphene plus non-null bandgap 1-3 . Besides width-and edge-dependent, GNR band-gap and other electronic properties were shown to change with the application of twisting along its axis 4-10 . Twisted GNRs (TGNRs) have already been produced 11-13 , but it remains a challenge to control and fine-tune their amount of torsional strain. Here, based on the strong adhesion between graphene layers 14,15 , I proposed a new way to change the amount of twist in a TGNR without rotating its extremities. By laying the extremities of a TGNR on two separate substrates and controlling the distance between them, I show by computational simulations that the total twist of the TGNR can be continuously varied within a certain interval. This happens because of a topological constraint imposed by the substrates on the geometric structure of the TGNR, leading to a new kind of twist-to-writhe conversion (TWC), well-known to happen in twisted structures, from DNA to marine cables 16-21 . Regular TWC is controlled by applying tension or changing the end-to-end distance of the filament 22,23 , while this new substrate induced TWC phenomenon relies only on the interactions between the TGNR and substrate. Possible applications are suggested.Electronic [7][8][9][10][11]24,25 , mechanical [26][27][28][29] and thermal [30][31][32] properties of TGNRs make them promising and versatile nanostructures for diverse applications. However, only few

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High Performance of Carbon Nanotube Refrigerators

Cited by 14 publications

References 21 publications

Room‐Temperature Colossal Elastocaloric Effects in Three‐Dimensional Graphene Architectures: An Atomistic Study

Room‐Temperature Colossal Elastocaloric Effects in Three‐Dimensional Graphene Architectures: An Atomistic Study

Carbon-Based Nanofluids and Their Advances towards Heat Transfer Applications—A Review

Twisting or untwisting graphene twisted nanoribbons without rotation

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