A Study on Preparation and Stabilizing Mechanism of Hydrophobic Silica Nanofluids

Abstract

Nanofluids have increasingly drawn interest in recent years with their various applications in a number of fields. The method for the preparation of stable nanofluids is a key concern for extending the application of nanofluids. This study focuses on the effect of pH, dosage of surfactant (TX-100), and nanofluid concentration on the stability of a silica nanofluid. Particle size and zeta potential are two important factors to consider in evaluating the stability of the silica nanofluid. Results indicate that the stability of the silica nanofluid highly depends on pH, dosage of surfactant (TX-100), and nanofluid concentration. On the basis of these experiments, the best conditions for the preparation of a silica nanofluid are 0.1 wt. % for the concentration of silica nanoparticles and TX-100 and 10 for pH. A transparent and stable silica nanofluid can thus be obtained.

Recent Progress on Stability and Thermo-Physical Properties of Mono and Hybrid towards Green Nanofluids

“…Physical treatment methods are used, such as magnetic stirring, ultrasonic agitation, homogenization, and ball milling [46]. Both magnetic stirrer and sonication devices are commonly used by researchers, such as Nabil et al [47], Zhao et al [48], and Hamid et al [49]. For chemical treatment methods, pH adjustments and the addition of the surfactants were employed to enhance the stability of the nanofluids [46].…”

Titania‐based transformer nanofluid: a study on the synthesis for enhanced breakdown strength and its humidity ageing

“…As it is a step by step synthesis method, the nanoparticle preparation and nanofluid synthesis are not done concurrently, hence it may undergo serious effects on its stability due to agglomeration in case of excess particle loading. Most of the researches optimises its particle loading at first and then utilises some major dispersion techniques like surface modification, mechanical stirring and ultrasound agitation to ensure a stable nanofluid [6, 9, 19, 20, 30, 45].…”

Feasibility of ANFIS-PSO and ANFIS-GA Models in Predicting Thermophysical Properties of Al2O3-MWCNT/Oil Hybrid Nanofluid

“…According to Choi and Eastman [1], the introduction of nanofluids, which are a suspension of nano-sized particles in conventional fluids (i.e., water, ethylene glycol (EG), oil, and so forth), has opened new doors to improve heat transfer rate. After this pioneering study, many researchers conducted different projects on preparation methods [2,3,4], characterization [5,6], thermophysical properties [7,8,9,10,11], heat transfer performance [12,13,14,15,16], and the possible applications [17,18,19] of different nanofluids. Due to the importance of nanofluids, many researchers have reviewed the published literature on different aspects of nanofluids, such as their thermophysical properties [20,21], methods regarding their modeling and simulation [22], and their applications [23,24].…”