Polymer-dispersant-stabilized Ag nanofluids for heat transfer applications

Abstract

One-step wet chemical method has been employed for the synthesis of silver (Ag) nanofluids followed by the preparation of polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and PVP–PVA mixed-dispersant-stabilized nanofluids by varying the concentration ratio of dispersants for the viscosity and thermal conductivity analysis. The optical absorption studies indicate the presence of nanoparticles in the prepared fluids (or the formation of the silver nanoparticles). The shape and size of the nanoparticles are confirmed by the field emission scanning electron microscopy, and the particle size distribution and zeta potential analysis were carried out by using dynamic light scattering. It is observed that the thermal conductivity of Ag nanofluids increases with an increase in the dispersant concentration with respect to the temperature. The maximum thermal conductivity enhancement of Ag nanofluids was observed in the presence of an equimolar ratio of PVP–PVA (1:1:1) blends as stabilizers. Graphic abstract

Experimental Study on a Superstable Nano-TiO2 Deep Eutectic Solvent Nanofluid for Solar Energy Harvesting

“…It is indicated that the weak chemical association between nanoparticle and glycerol plays a significant role in the thermal conductivity of the desired nanofluids. In addition, the specific heat capacity of DES-based nanofluids was studied by means of some chemical analysis approaches, and it was found that hydrogen bonding association was beneficial for specific heat capacity and the addition of nanoparticle which could interact with hydrogen bond donor component and give a positive effect on increasing the specific heat capacity. − Whereas vast advances in researching DES-based nanofluids regarding the thermophysical properties and application in energy transportation have been made, an unavoidable issue of DES-based nanofluids is always lying on the avenue of further intensive practical utilization of them, namely, static stability. − Generally, the way for solving the poor stability of a suspension mainly relies on the addition of dispersant which could be used to increase the potential energy of nanoparticle surface and leads to the dispersing of nanoparticle in the environment of base solvent and restrain from aggregation. − Dispersant, also known as surfactant, can be mainly divided into anionic, cationic, and neutral types, is usually used in accordance with the characteristics of base solvents. Compared with the traditionally used single-component solvent, DES are constituted by at least two components, and each component associates with each other by a hydrogen bond effect.…”

Impact of magnetic-field on the dynamic of gas bubbles in N-dimensions of non-Newtonian hybrid nanofluid: analytical study

“…Many scientific and industrial problems connect to the flow of nanoparticles in liquids, gases, and plasma which are typical forms of nanofluids [1,2]. These subjects have acquired a great deal of interest in the area of innovative industrial applications, such as solving coating issues and manufacturing nanotechnology processes, such the exotic chemical manufacturing [3], polymers [4], minerals [5], medical [6], environmental energy [7], and biological research [8,9]. Bubbly flows are frequently encountered in both metallurgical and applications of chemical engineering, as bubbles are generated or injected into the reactors to create global bubbles [10][11][12].…”

“…From basic research to manufacturing in nanomaterial science, rapid advancements in that subject have been preceded by revolutions in new nanotechnologies, such nanofluid and hybrid nanofluids, and new applications, such as the area of nanotechnology in medicine, Nano-biological systems, and Nano-electronics [1][2][3][4][5][6][7][8][9]. For instance, Morad et al [10,21] used the non-Newtonian turbulent nanofluid in N-dimension to control the bubble growth in a superheated power-law fluid.…”

Impedance Spectroscopy, AC Conductivity, and Conduction Mechanism of Iron(II) Chloride/Polyvinyl Alcohol/Polyvinylpyrrolidone Polymer Blend

“…It has also some natural characterization, including nontoxicity, chemical resistance biocompatibility, and hydrophilicity. e polymer blend of synthetic polymers such as PVP and PVA is very important for various applications, such as electrochemical devices [3], heat transfer [11], wound healing [12][13][14], tissue engineering [15,16], biological medical applications [3,4], arti cial skin [16], and composite membranes [17,18]. In addition, several attempts have been made to prepare the blends or composite materials based on PVP and PVA doped with other elements [19][20][21][22].…”