Viscosity and thermal conductivity of ZnO–water-based nanofluids stabilized by grafted SMA-g-MPEG comb-shaped copolymer for heat transfer applications

Pavithra, K. S.; Puttaiahgowda, Yashoda Malgar; Prasannakumar, S.; Mutalik, Srinivas

doi:10.1007/s13726-020-00784-x

Cited by 7 publications

(4 citation statements)

References 43 publications

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“…Among several metal oxides that are being used as an antibacterial agent, it is reported that ZnO is proven to be more abundant, low cost, biocompatible, and less toxic [2]. The general distraction mechanism of metal oxides, especially ZnO is due to the generation of reactive oxygen species such as H 2 O 2 , OH -, and O 2 −2 [3,4].…”

Section: Introductionmentioning

confidence: 99%

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PVA assisted ZnO based mesoporous ternary metal oxides nanomaterials: synthesis, optimization, and evaluation of antibacterial activity

Abebe

Murthy

Zereffa

et al. 2020

Mater. Res. Express

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The poly (vinyl alcohol) (PVA) assisted highly mesoporous Zn-Fe-Mn oxides nanomaterials were synthesized using the sol-gel followed by the self-propagation techniques. The UV-vis spectroscopic technique was used to study the optical properties of the materials. The presence of metal-oxygen bond and deposited OH − /H 2 O species were characterized by FT-IR spectroscopic technique. The porous morphology and elemental analysis were confirmed by the SEM/EDX and further morphological and crystal structure studies were conducted using TEM/HRTEM techniques. The semi-crystallinity and composition analyses were verified from XRD patterns. Using the BET N 2 adsorption-desorption analytical techniques; the porosity, specific surface area, and pore diameter enhancements were confirmed. The optima of PVA and precursors percentage were selected with the help of XRD, UV-Vis, and SEM techniques. The potential of the materials towards antibacterial activities was evaluated against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacteria. The 50(0.7) PVA assisted ternary metal oxide nanocomposite (PVA-TMONC) with 125 μg ml −1 concentration showed better inhibition zone for both Escherichia coli and Staphylococcus aureus bacteria, with a value of 28 and 29 mm in diameter, respectively.

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Section: Introductionmentioning

confidence: 99%

“…XRD data for precursor percentage optimization. )2 .6H 2 O, INH =e(NO 3 ) 3 .9H 2 O, and MSH=MnSO 4 .H 2 O…”

mentioning

confidence: 99%

PVA assisted ZnO based mesoporous ternary metal oxides nanomaterials: synthesis, optimization, and evaluation of antibacterial activity

Abebe

Murthy

Zereffa

et al. 2020

Mater. Res. Express

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“…Thermal conductivity increases with increasing temperature and gradually decreases with increasing polymer dispersant concentration due to overadsorption of polymer dispersants, which inhibits heat transfer as well as Brownian motion of NPs. The ionic interaction of the highly functionalized hydrophobic styrene moiety adsorbed on the cationic surface of the ZnO NPs and the hydrophilic ionizable sulfonal ( ) and hydroxyl (–OH) functionlized AMPS moiety extended into the fluids suspension creates an effective electrostatic barrier between the NPs in the base fluids, promoting homogeneous dispersion and stabilisation which inturn enhaces the heat transfer 24 , 38 .…”

Section: Resultsmentioning

confidence: 99%

“…The synthesis and characterisation of ZnO NPs were described in the previous publication 24 , 25 . The same ZnO NPs were used in this present study.…”

Section: Methodsmentioning

confidence: 99%

Investigation of thermal conductivity and thermal performance of heat pipes by structurally designed copolymer stabilized ZnO nanofluid

Pavithra,

Parol,

Brusly Solomon

et al. 2023

Sci Rep

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The present study concentrated on estimating the thermal conductivity, stability, efficiency, and resistance of a heat pipe for heat exchangers, which were essential for many industrial applications. To achieve this, copolymer of amphiphilic poly (styrene-co-2-Acrylamido-2-methylpropane sulfonic acid) poly (STY-co-AMPS) was synthesized by free radical polymerisation technique. The dispersant were used for homogeneous solution and stabilization of ZnO nanofluids. The effect of dispersant on the thermal conductivity of nanofluids was analysed using a KD2 pro thermal property analyser. There is a significant increase in fluid conductivity had a nonlinear relationship with the volume fraction. The maximum enhancement was observed at an optimized concentration of dispersant at 1.5 vol%. Same time, the influence of dispersant agent on the thermal conductivity of nanofluids were compared with linear polyelectrolytes. Further, the experimental values were compared to the existing classical models based on the reasonable aggrement, the prepared nanofluids were employed as a working medium. The conventional screen mesh heat pipe and the temperature distribution to the thermal resistance of the heat pipe was investigated experimentally. The result shows, optimum concentration of dispersants on nanoparticles exhibits an enhanced heat efficiency as compared with the base fluids. Further, the thermal resistance and temperature distribution show decreased behaviour by increasing the particle volume fraction and dispersant concentration.

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Mechanism of the effect of esterified modified polystyrene-maleic anhydride on the dispersion and stability of carbon black in colour paste

Zhao

Liu

Yang

et al. 2023

Progress in Organic Coatings

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Viscosity and thermal conductivity of ZnO–water-based nanofluids stabilized by grafted SMA-g-MPEG comb-shaped copolymer for heat transfer applications

Cited by 7 publications

References 43 publications

PVA assisted ZnO based mesoporous ternary metal oxides nanomaterials: synthesis, optimization, and evaluation of antibacterial activity

PVA assisted ZnO based mesoporous ternary metal oxides nanomaterials: synthesis, optimization, and evaluation of antibacterial activity

Investigation of thermal conductivity and thermal performance of heat pipes by structurally designed copolymer stabilized ZnO nanofluid

Mechanism of the effect of esterified modified polystyrene-maleic anhydride on the dispersion and stability of carbon black in colour paste

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