Influence of amphoteric and anionic surfactants on stability, surface tension, and thermal conductivity of Al2O3/water nanofluids

Baek, Seungyeop; Shin, Dongwook; Kim, Gyuchang; Lee, Ajeong; Noh, Jungpil; Choi, Byeong-Keun; Huh, Sun-Chul; Jeong, Hyomin; Sung, Youl-Moon

doi:10.1016/j.csite.2021.100995

Cited by 38 publications

(12 citation statements)

References 38 publications

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“…Interestingly, there is a contradictory study that is related to the degradation effect of LB on the dispersion characteristics of nanofluids. According to the experimental results [33], the absorbance of 0.5 wt% of an Al 2 O 3 /water nanofluid decreased throughout the wavelength range of 700 to 1000 nm. However, it is worth noting that the absorbance of the 0.5 wt% Al 2 O 3 /water nanofluid increased with an increase in the concentration of LB, although that without LB had the highest value.…”

Section: Effect Of Lb On Contact Angle Of Dw and Cnt Nanofluidsmentioning

confidence: 92%

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Effect of an Amphoteric Surfactant Concentration on Absorbance, Contact Angle, Surfactant, and Thermal Conductivity of CNT Nanofluids

Baek,

Lee,

Sung

et al. 2023

Energies

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In this work, the effects of carbon nanotubes and an amphoteric surfactant, namely lauryl betaine, on the absorbance, contact angle, surface tension, and thermal conductivity of DW were experimentally investigated. The concentration of the carbon nanotubes was 0.5 wt% and that of lauryl betaine was 100, 500, and 1000 ppm in distilled water. From the absorbance measurement results, the addition of lauryl betaine could increase the absorbance in the wavelength range of UV and visible rays (200~1000 nm). In addition, the higher the surfactant concentration, the higher the dispersibility. The contact angle of the distilled water showed a monotonic decreasing trend with an increase in the surfactant blending ratio, while there were no significant changes in that of the carbon nanotube nanofluid. Analogous behaviors were observed in the surface tension measurements. The surface tension of the distilled water dramatically decreased with an increase in the surfactant blending ratio. The highest decrement was 46.05% at the surfactant concentration of 1000 ppm. In contrast, there were no significant changes in the case of the carbon nanotube nanofluid. Adding 0.5 wt% of the carbon nanotubes to distilled water could substantially enhance the thermal conductivity up to approximately 3%. The degradation effect of the amphoteric surfactant on the thermal conductivity of the fluids was observed in both distilled water and nanofluids.

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Section: Effect Of Lb On Contact Angle Of Dw and Cnt Nanofluidsmentioning

confidence: 92%

“…Regarding the aforementioned results, the contradictory effect of LB on the dispersion characteristics of nanofluids is related to the electrostatic attraction and repulsion between the surfactant and nanomaterial [33].…”

Section: Effect Of Lb On Contact Angle Of Dw and Cnt Nanofluidsmentioning

confidence: 99%

Effect of an Amphoteric Surfactant Concentration on Absorbance, Contact Angle, Surfactant, and Thermal Conductivity of CNT Nanofluids

Baek,

Lee,

Sung

et al. 2023

Energies

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“…However, the different results of light absorbance and subsequently the stability of Al 2 O 3 NFs measured in different labs [ 37 , 38 ] can be due to the different preparation methods (mixing time, temperature, adding surfactants, etc. ), particles size and concentrations, BF type, and storage conditions.…”

Section: Preparation and Nf Samplesmentioning

confidence: 99%

Pool Boiling Heat Transfer Characteristics of New and Recycled Alumina Nanofluids

Ajeeb

Murshed

2023

Nanomaterials

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This paper reports an experimental investigation of the heat transfer features of new and recycled Alumina (Al2O3) nanofluids (NFs) in the pool boiling (PB) system. The mixture of ethylene glycol (EG) and distilled water (DW) is selected as the base fluid (BF), and NFs samples of two low concentrations (0.01 and 0.05 vol.%) of Al2O3 nanoparticles were prepared. Furthermore, the characteristics of the prepared NFs are evaluated to investigate the heat transfer performance as well as the reusability of the NFs for long-term applications and recycling consideration. Although there have been a large number of boiling studies with NFs, the current study is the first of its kind that addresses the mentioned operation conditions of recycling NF samples. The results are compared with the relevant BF in terms of properties, critical heat flux (CHF), burnout heat flux (BHF), and the convection coefficient of the Al2O3 NFs in the PB system. The results showed good enhancements in both CHF and BHF of these NFs yielding up to 60% and 54% for BHF at 0.05 vol.%, respectively. The reusage of the previously used (recycled) Al2O3 NF showed a considerable increase in heat transfer performance compared to base fluids but slightly lower than the newly prepared one. The results of the reused nanofluids demonstrate the great prospects of their recyclability in heat transfer systems and processes such as in pool boiling.

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“…Ionic surfactants, on the other hand, are classed as anionic, cationic, or amphoteric based on the ionic charge created when they dissolve in water 1 . Because of their fascinating chemical features such as lowering surface tension and interfacial tension, emulsification, lubricating, and wetting ability, they are also proven to have antibacterial, antifungal, antiviral, and anticancer activities 2–6 …”

Section: Introductionmentioning

confidence: 99%

Oleic acid‐rich waste fleshing oil as a secondary carbon source for the synthesis of sophorolipids

Brindha

Vedaraman

Murthy

et al. 2023

Env Prog and Sustain Energy

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Biosurfactants are nontoxic, renewable, and environmentally benign; and have excellent emulsification and antibacterial properties. Oleic acid‐rich oils have a crucial role as a hydrophobic substrate in the biological production of sophorolipids (SL). The major purpose of this study is to identify a low‐cost oleic acid‐rich hydrophobic substrate that may be used as a secondary carbon source in the synthesis of SL by Starmerella bombicola (S. bombicola). Thus, the biosynthesis of SL was investigated utilizing a variety of edible and nonedible oils rich in oleic acid, which acts as a precursor. Characterization of SL generated from different oils using FT‐IR and NMR indicated the presence of both lactonic and acidic SL. SL production was greatest with secondary carbon sources, with 38.9, 27.57, and 19 g/L, respectively, in the order olive oil > sunflower oil > fleshing oil. Surprisingly, the cost analysis for fleshing oil synthesis indicated that it was the lowest at 0.43 INR/g, followed by sunflower oil at 0.52 INR/g and olive oil at 1.71 INR/g. Our findings indicate that fleshing oil is a potential secondary carbon source with significant SL yield as well as environmental and economic benefits.

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Influence of amphoteric and anionic surfactants on stability, surface tension, and thermal conductivity of Al2O3/water nanofluids

Cited by 38 publications

References 38 publications

Effect of an Amphoteric Surfactant Concentration on Absorbance, Contact Angle, Surfactant, and Thermal Conductivity of CNT Nanofluids

Effect of an Amphoteric Surfactant Concentration on Absorbance, Contact Angle, Surfactant, and Thermal Conductivity of CNT Nanofluids

Pool Boiling Heat Transfer Characteristics of New and Recycled Alumina Nanofluids

Oleic acid‐rich waste fleshing oil as a secondary carbon source for the synthesis of sophorolipids

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