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Your search keyword '"Lad, V. N."' showing total 10 results
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10 results on '"Lad, V. N."'

6. Magnetic nanofluid: synthesis and characterization

Author

Agnihotri, Paritosh and Lad, V. N.

Abstract

Abstract: Dispersing nanoparticles in the liquid significantly alters the transport properties of the resulting fluids. Conventional coolants such as water and oils have comparatively low thermal conductivities and offer somewhat limited heat transfer coefficients to accomplish the typical cooling applications. Dispersed nanoparticles with higher thermal conductivity provide better transport properties leading to enhanced heat transfer coefficients in many devices of different size. Nanofluids which contain nanoparticles dispersed in continuous liquid phase provide many promising properties as compared to conventional fluids. In the present work, we prepared magnetic nanoparticles by the co-precipitation, followed by ultrasonication and coating with oleic acid, which were ultimately dispersed in kerosene as a carrier fluid. The agglomeration of the coated particles was thus prevented to improve their stability. The samples were analysed with various sophisticated techniques such as high-resolution transmission electron microscopy, field emission scanning electron microscopy, dynamic light scattering, zeta potential, X-ray diffraction, Fourier transform infrared spectra, thermogravimetric analysis, rheometry, and superconducting quantum interference device. The coated magnetic nanoparticles showed weak attraction force and offered reasonable colloidal stability of the nanofluid. Graphic abstract:

Published
2024
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8. Interfacial Interactions of Monoolein Langmuir Monolayers with Aqueous Salt Solutions

Author

Dhopte, Balaji S.; Department of Chemical Engineering, Sardar Vallabhbhai National Institute of Technology – Surat, Ichchhanath, Surat – 395007, Gujarat, Lad, V. N.; Department of Chemical Engineering, Sardar Vallabhbhai National Institute of Technology – Surat, Ichchhanath, Surat – 395007, Gujarat, Dhopte, Balaji S.; Department of Chemical Engineering, Sardar Vallabhbhai National Institute of Technology – Surat, Ichchhanath, Surat – 395007, Gujarat, and Lad, V. N.; Department of Chemical Engineering, Sardar Vallabhbhai National Institute of Technology – Surat, Ichchhanath, Surat – 395007, Gujarat

Abstract

Langmuir monolayer is a unique tool to characterize the interface which describes the properties of insoluble monolayer on the sub-phase. Langmuir monolayers have demonstrated the characteristics of many macromolecules as well as amphiphilic molecules at the air-water interface. We evaluated physiochemical characteristics of monoolein lipid Langmuir monolayers on different sub-phases. Interfacial behaviour of monoolein lipid was investigated using Wilhelmy plate pressure sensor technique to generate Langmuir isotherms to explore the effects of interactions with different sub-phases. Various salts alter the surface pressure of the Langmuir monolayer isotherms without the alteration of monolayer phase transitions. The finding of the present work can be effectively used for development of suitable biomedical formulations to offer sufficient strength of coating film with controlled topology and thickness using Langmuir-Blodgett film deposition technique. Addition of the suitable biocompatible ions in to the sub-phase is very crucial for their favourable interfacial interaction with the lipid molecules.

Published
2022

9. Interfacial Interactions of Monoolein Langmuir Monolayers with Aqueous Salt Solutions

Author

Dhopte, Balaji S., Lad, V. N., Dhopte, Balaji S., and Lad, V. N.

Abstract

Langmuir monolayer is a unique tool to characterize the interface which describes the properties of insoluble monolayer on the sub-phase. Langmuir monolayers have demonstrated the characteristics of many macromolecules as well as amphiphilic molecules at the air-water interface. We evaluated physiochemical characteristics of monoolein lipid Langmuir monolayers on different sub-phases. Interfacial behaviour of monoolein lipid was investigated using Wilhelmy plate pressure sensor technique to generate Langmuir isotherms to explore the effects of interactions with different sub-phases. Various salts alter the surface pressure of the Langmuir monolayer isotherms without the alteration of monolayer phase transitions. The finding of the present work can be effectively used for development of suitable biomedical formulations to offer sufficient strength of coating film with controlled topology and thickness using Langmuir-Blodgett film deposition technique. Addition of the suitable biocompatible ions in to the sub-phase is very crucial for their favourable interfacial interaction with the lipid molecules.

Published
2022

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