A Simple Approach for Heat Transfer Enhancement of Carbon Nanofluids in Aqueous Media

Dovjuu, Otgonbayar; Kim, Sedong; Lee, Ajeong; Kim, Junhyo; Noh, Jungpil; Huh, Sun-Chul; Choi, Byeong-Keun; Jeong, Hyomin

doi:10.1166/jnn.2020.17375

Cited by 10 publications

(7 citation statements)

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“…NCC also increases the electrical and thermal conductivity of CNM dispersions, as demonstrated by Dovjuu et al in 2020 [5]. The study focused on using NCC to create stable, aqueous dispersions of MWCNTs and graphene for use as a heat transfer fluidthis was achieved by adding CNMs to solutions of varying concentrations of NCC and ultrasonication for 1 h. It was found that this strategy was able to form stable aqueous dispersions of both CNMs, whilst enhancing the thermal and electrical conductivity of the nanomaterials.…”

Section: Cellulosementioning

confidence: 69%

“…Their impressive mechanical strength, extremely high surface area, and thermal properties have not escaped the interest of researchers [3]. With applications in engineering [4,5], biomedicine [6,7], and renewable energy [8,9], this unique class of materials, and indeed nanotechnology in general, is set to have an enormous impact on our future. In fact, nanomedicine has been recognised as a "key enabling technology" by the EU [10]; by 2016, the FDA had approved 51 nanomedicines [11].…”

Section: Introductionmentioning

confidence: 99%

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Biocompatible Dispersants for Carbon Nanomaterials

2021

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Carbon nanomaterials (CNMs) are a fascinating class of materials that have gained considerable interest in recent years. Their favourable biocompatibility, combined with unique chemical and mechanical properties, has attracted scientists from various disciplines. A significant hurdle in their deployment in biomedical applications is their hydrophobicity in their pristine form. This review surveys and discusses existing non-covalent methods of functionalising CNMs with biocompatible dispersants to facilitate their incorporation into aqueous solutions. Different types of dispersants will be examined and compared as well as the factors affecting their efficiency. This work seeks to provide a compilation of the various methods employed in producing biocompatible CNM dispersions.

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Section: Cellulosementioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Biocompatible Dispersants for Carbon Nanomaterials

2021

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“…Both the research studies show a similar trend in their results, where the effectiveness was higher in the case of GA and lower in cases of SDS, SDBD, and CTAB. This claim was further solidified in various other research works (Bandyopadhyaya et al, 2002;Baghalha and Kamal-Ahmadi, 2011;Yousefi et al, 2012;Ghozatloo et al, 2014;Sabiha et al, 2016;Raju et al, 2017;Choi et al, 2018;Zhai et al, 2019;Almanassra et al, 2020;Dovjuu et al, 2020). However, the effectiveness of the surfactants cannot be judged on the basis of just one or two parameters.…”

Section: Surfactants Used In Stabilizing Organic Nanofluidsmentioning

confidence: 88%

“…Therefore, this method found its use in the synthesis of almost all organic nanofluids for the past two decades (Baghalha and Kamal-Ahmadi, 2011;Yousefi et al, 2012;Esfe et al, 2014b;Ghozatloo et al, 2014;Sarafraz et al, 2016;Soltanimehr and Afrand, 2016;Sabiha et al, 2016;Alirezaie et al, 2017;Sadri et al, 2017;Raju et al, 2017;Choi et al, 2018;Karami et al, 2019;Zhai et al, 2019;Pourrajab et al, 2020;Almanassra et al, 2020; 2003), (C) chemical precipitation process by Mondal et al (2016), (D) condensation/dispersion method by Ali et al (2018), and (E) bio-based process by Sadri et al (2017). Dovjuu et al, 2020). Figure 1A shows a typical layout of the processes involved during the research work of Majumder and Das (2020) and an illustration of their synthesized nanofluid has been shown in Figure 1B.…”

Section: Two-step Methodsmentioning

confidence: 99%

A Short Review of Organic Nanofluids: Preparation, Surfactants, and Applications

Majumder

Das

2021

Front. Mater.

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Recently, there has been significant advancement in efforts toward achieving zero-energy buildings. It is quite evident that the HVAC systems consume a considerable percentage of the total energy consumption of a building; therefore, making them sustainable is of the utmost importance. Nanofluid serves as a simple, yet innovative, approach in decreasing the power consumption of the HVAC systems by improving the thermophysical properties of the coolants and enhancing heat transfer. As a result, this has attracted the attention of many researchers across the globe. This manuscript reviews the different preparation methods of nanofluid, surfactants used in stabilizing the nanofluid, and the different areas in which it can be used.

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“…However, the metal coating layer could be damaged under the strain, further resulting in the sharp drop of the conductivity. Conductive nanomaterials, such as silver nanowires and carbon nanotubes, have been dispensed on the textile substrates to form conductive coatings [14,15]. The inter-crosslinked nanowires or nanotubes could tolerate the stretching, but the high cost of the conductive materials and the complicated fabrication procedures may hinder their mass-production and feasibility.…”

Section: Introductionmentioning

confidence: 99%

Preparing Polypyrrole-Coated Stretchable Textile via Low-Temperature Interfacial Polymerization for Highly Sensitive Strain Sensor

Chen

Qiao

et al. 2019

Micromachines

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The stretchable sensor has been considered as the most important component in a wearable device. However, it is still a great challenge to develop a highly sensitive textile-based strain sensor with good flexibility, excellent skin affinity, and large dynamic range. Herein, polypyrrole (PPy) was immobilized on a stretchable textile knitted by polyester and spandex via low-temperature interfacial polymerization to prepare a conductive strain sensor for human motion and respiration measurements. Scanning electron microscopy, Fourier transform infrared spectrometry, and thermal gravimetric data verify that a thin layer of PPy has been successfully coated on the textile with a high density and very uniform distribution. The resistance of the as-prepared textile is 21.25 Ω/cm2 and the PPy-coated textile could be used as an electric conductor to light up a LED lamp. Moreover, the textile could tolerate folding at an angle of 180° and 500 times of bending-twisting cycles without significant changes on its resistance. A negative correlation between the resistance change and the applied strain is observed for the textile-based sensor in the strain ranging from 0 to 71% with the gauge factor of −0.46. After more than 200 cycles of stretching-releasing under the strain of 26%, there is no obvious alteration on the sensing responses. The sensors were attached on volunteers’ body or clothes for the real-time measurement of human motions and respiration, demonstrating that the textile-based sensor could sensitively detect finger, elbow, and knee bending and differentiate deep, normal, and fast breath. This work may provide an approach to uniform and dense coating conductive polymers on textiles for highly sensitive and stretchable sensors, which possess great potentials in practical applications for real-time monitoring human motions and physiological signs.

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A Simple Approach for Heat Transfer Enhancement of Carbon Nanofluids in Aqueous Media

Cited by 10 publications

References 0 publications

Biocompatible Dispersants for Carbon Nanomaterials

Biocompatible Dispersants for Carbon Nanomaterials

A Short Review of Organic Nanofluids: Preparation, Surfactants, and Applications

Preparing Polypyrrole-Coated Stretchable Textile via Low-Temperature Interfacial Polymerization for Highly Sensitive Strain Sensor

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