Journal ArticleDOI
Effects of interplay of nanoparticles, surfactants and base fluid on the surface tension of nanocolloids
A. R. Harikrishnan,Purbarun Dhar,Prabhat K. Agnihotri,Sateesh Gedupudi,Sarit K. Das,Sarit K. Das +5 more
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TLDR
The present paper conclusively explains several physical phenomena observed, yet hitherto unexplained, in the case of the surface tension of such complex fluids by segregating the individual contributions of each component of the colloidal system.Abstract:
A systematically designed study has been conducted to understand and demarcate the degree of contribution by the constituting elements to the surface tension of nanocolloids. The effects of elements such as surfactants, particles and the combined effects of these on the surface tension of these complex fluids are studied employing the pendant drop shape analysis method by fitting the Young-Laplace equation. Only the particle has shown an increase in the surface tension with particle concentration in a polar medium like DI water, whereas only a marginal effect of particles on surface tension in weakly polar mediums like glycerol and ethylene glycol has been demonstrated. Such behaviour has been attributed to the enhanced desorption of particles to the interface and a theory has been presented to quantify this. The combined particle and surfactant effect on the surface tension of a complex nanofluid system showed a decreasing behaviour with respect to the particle and surfactant concentration with a considerably feeble effect of particle concentration. This combined colloidal system recorded a surface tension value below the surface tension of an aqueous surfactant system at the same concentration, which is a counterintuitive observation as only the particle results in an increase in the surface tension and only the surfactant results in a decrease in the surface tension. The possible physical mechanism behind such an anomaly happening at the complex fluid air interface has been explained. Detailed analyses based on thermodynamic, mechanical and chemical equilibrium of the constituents and their adsorption-desorption characteristics as extracted from the Gibbs adsorption analysis have been provided. The present paper conclusively explains several physical phenomena observed, yet hitherto unexplained, in the case of the surface tension of such complex fluids by segregating the individual contributions of each component of the colloidal system.read more
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Effect of surfactant on thermo-physical properties and spray cooling heat transfer performance of Cu-Zn-Al LDH nanofluid
TL;DR: In this paper, the effect of surfactant addition on thermo-physical properties, stability, and heat transfer performance of Cu-Zn-Al LDH nanofluid was investigated.
Journal ArticleDOI
Interfacial energy for solutions of nanoparticles, surfactants, and electrolytes
Journal ArticleDOI
Catalytic Methane Pyrolysis in Molten Alkali ChlorideSalts Containing Iron
Dohyung Kang,Clarke Palmer,Davide Mannini,Nazanin Rahimi,Michael J. Gordon,Horia Metiu,Eric W. McFarland +6 more
TL;DR: In this article, it was shown that a mixture of molten iron-sodium-potassium chloride salts is catalytic for methane pyrolysis in a differential bubble column reactor.
Journal ArticleDOI
Effective surface tension of liquid marbles using controllable nanoparticle monolayers
Journal ArticleDOI
Wettability of Complex Fluids and Surfactant Capped Nanoparticle-Induced Quasi-Universal Wetting Behavior.
A. R. Harikrishnan,Purbarun Dhar,Prabhat K. Agnihotri,Sateesh Gedupudi,Sarit K. Das,Sarit K. Das +5 more
TL;DR: In this article, the combined effect of surfactants and nanoparticles on the wettability of complex fluids such as nanocolloids on different substrates, ranging from hydrophilic with a predominantly polar surface energy component (silicon wafer and glass) to near hydrophobic range with a predominant dispersive component of surface energy (aluminum and copper substrates).
References
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Journal ArticleDOI
Heat Transfer in Nanofluids—A Review
TL;DR: In this paper, the authors present an exhaustive review of the literature in this area and suggest a direction for future developments, including heat transfer, material science, physics, chemical engineering and synthetic chemistry.
Journal ArticleDOI
A critical synthesis of thermophysical characteristics of nanofluids
K. Khanafer,Kambiz Vafai +1 more
TL;DR: A critical synthesis of the variants within the thermophysical properties of nanofluids is presented in this article, where the experimental results for the effective thermal conductivity and viscosity reported by several authors are in disagreement.
Journal ArticleDOI
Dynamic surface tension and adsorption mechanisms of surfactants at the air–water interface
Julian Eastoe,James S. Dalton +1 more
TL;DR: The first reported measurements of the dynamic surface excess Gamma(t), using the overflowing cylinder in conjunction with neutron reflection, are described.
Journal ArticleDOI
On the determination of the critical micelle concentration by the pyrene 1:3 ratio method
TL;DR: In this paper, a simple and accurate approach to the treatment of pyrene 1:3 ratio data in the context of critical micelle concentration determination in surfactant solutions is established.
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