Carbon Nanotube and Graphene Aerogels – The World’s 3D Lightest Materials for Environment Applications: A Review

Hong, Phan Ngoc

doi:10.11648/j.ijmsa.20170606.12

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…[ 44 ] Xie et al also measured the thermal conductivity of MWNCTs suspended in three different base fluids (water, EG, and decene). [ 45 ] An enhancement of 20% was achieved in decene for 1% volume concentration, and the thermal conductivity was found to increase linearly with volume fraction; however, the enhancement was smaller than that reported by Choi et al [ 44 ] Generally, in all studies, [ 22–51 ] thermal conductivity enhancement was obtained with addition of carbon‐based nanoparticles such as MWCNTs, single‐walled CNTs (SWCNTs), graphene, and CNHs. Instead of enhancing thermal conductivity, carbon‐based nanoparticles such as graphene, GO, carbon spheres, and CNT have been used as lubricants for friction and wear reduction.…”

Section: Carbon‐based Nanoparticlesmentioning

confidence: 89%

“…[ 23,24 ] Based on the literature, carbon‐based nanolubricants exhibit superior thermophysical properties compared with other regularly utilized materials such as metals and oxides. [ 25–27 ] In comparison with other types of nanomaterials, CNT and graphene are widely investigated due to their high thermal conductivity, [ 28,29 ] high aspect ratio, [ 30 ] low density, [ 31 ] and high stability. [ 29 ]…”

Section: Introductionmentioning

confidence: 99%

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A Review on Thermophysical Properties for Heat Transfer Enhancement of Carbon‐Based Nanolubricant

Saufi

Mamat

2021

Adv Eng Mater

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In previous years, nanolubricants have gained attention in terms of their use as heat transfer fluids in applications such as engine cooling and air conditioning. Carbon-based nanolubricants have attracted great interest due to their superior heat transfer performance. To date, the stability of a carbon-based nanolubricant is crucial if the enhanced properties are to be retained after the fabrication process. In this context, the current research aims to review the stability and thermophysical properties of carbon-based nanolubricants. Recent works on these nanolubricants are summarized herein, including the method of preparation and improvements in their properties. The factors that affect the thermal conductivity and viscosity are also discussed, and finally, the applications of nanolubricants are described. The recent studies of nanolubricants are summarized and opportunities for further improvements in their efficiency are suggested.

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Section: Carbon‐based Nanoparticlesmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

A Review on Thermophysical Properties for Heat Transfer Enhancement of Carbon‐Based Nanolubricant

Saufi

Mamat

2021

Adv Eng Mater

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“…The motivation behind exploring these different chemistries for aerogels is about elaborating interesting and innovating microstructures, chemistries, properties, and applications. The variety of their chemistry allows aerogels to be promising candidates for applications in thermal insulation, catalysis and gas separation, oil spillage absorption, and so forth. ,,− …”

Section: Introductionmentioning

confidence: 99%

Silica–Resorcinol–Melamine–Formaldehyde Composite Aerogels as High-Performance Thermal Insulators

et al. 2022

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Here, we report the gelation and supercritical drying of ethanol-based silica–resorcinol–melamine–formaldehyde (RMF) composite aerogels with relative concentrations of initial reagents ranging from neat silica to neat RMF alcogels. The as-prepared materials are subsequently supercritically dried with carbon dioxide. Their properties include a thermal conductivity in the 15–20 mW·m –1 ·K –1 range even with a silica content as low as 20% wt . The possible reasons behind this interesting insulation performance and the mechanisms leading to the underlying gel structure are discussed in depth. A focus is made on the different gelation modes happening between the RMF and silica phases, from a coating of silica surfaces with RMF species to discontinuous RMF particles within a silica backbone and a continuous RMF backbone with isolated silica particles. The implications in terms of mechanical properties and thermal conductivity are elaborated upon. The initial ratio of silica–RMF species in this ethanol-based synthesis affects the micro- and macrostructure of the composites, resulting in materials with drastically different pore structures and thus an interesting array of possibilities for a new class of silica-organic composite aerogels, based on a sol–gel process.

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“…Furthermore, the paper focuses on nanosuspensions made of carbon nanotubes (CNTs), due to these particles having exceptional thermal properties when compared with other known nanomaterials [34,35]. For example, CNTs have extremely elevated thermal conductivity [36,37], large aspect ratio [38], lower density [39,40], lower erosion and corrosion surface effects [41], higher stability [37], and lower pressure drop and pumping power requirements in comparison to their counterparts [42,43]. Section 2 presents a review of HEs general operation theory together with an in-depth focus on two key types of heat transfer devices, such as the PHE and PFHE.…”

Section: Introductionmentioning

confidence: 99%

On the Role of Nanofluids in Thermal-hydraulic Performance of Heat Exchangers—A Review

et al. 2020

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Heat exchangers are key components in many of the devices seen in our everyday life. They are employed in many applications such as land vehicles, power plants, marine gas turbines, oil refineries, air-conditioning, and domestic water heating. Their operating mechanism depends on providing a flow of thermal energy between two or more mediums of different temperatures. The thermo-economics considerations of such devices have set the need for developing this equipment further, which is very challenging when taking into account the complexity of the operational conditions and expansion limitation of the technology. For such reasons, this work provides a systematic review of the state-of-the-art heat exchanger technology and the progress towards using nanofluids for enhancing their thermal-hydraulic performance. Firstly, the general operational theory of heat exchangers is presented. Then, an in-depth focus on different types of heat exchangers, plate-frame and plate-fin heat exchangers, is presented. Moreover, an introduction to nanofluids developments, thermophysical properties, and their influence on the thermal-hydraulic performance of heat exchangers are also discussed. Thus, the primary purpose of this work is not only to describe the previously published literature, but also to emphasize the important role of nanofluids and how this category of advanced fluids can significantly increase the thermal efficiency of heat exchangers for possible future applications.

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Carbon Nanotube and Graphene Aerogels – The World’s 3D Lightest Materials for Environment Applications: A Review

Cited by 10 publications

References 15 publications

A Review on Thermophysical Properties for Heat Transfer Enhancement of Carbon‐Based Nanolubricant

A Review on Thermophysical Properties for Heat Transfer Enhancement of Carbon‐Based Nanolubricant

Silica–Resorcinol–Melamine–Formaldehyde Composite Aerogels as High-Performance Thermal Insulators

On the Role of Nanofluids in Thermal-hydraulic Performance of Heat Exchangers—A Review

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