Preparation of binary nanofluid with heat transfer additives by particle surface functionalisation

Abstract Current binary nanofluid synthesis methods with heat transfer additives lack an understanding of the chemistry nanoparticle-additive-base fluid interaction, which plays a significant role in adsorption surfactant on nanoparticle surface. Consequently, this leads to formation aggregates within after couple days, affecting stability colloidal suspension. Here, lithium bromide-alumina salt-based is proposed following newly developed method including particle surface functionalisation. The new procedure allows initial preparation nanoparticles as first step (surface functionalisation) and then base dispersion stabilising agent (Gum Arabic) separately. This followed by prepared alumina into fluid, stirring ultrasonication produce final nanofluid, bromide-water (LiBr-H2O)-alumina nanofluid. Until now, proper procedures have not been reported for combining dispersant nanoparticles-surfactant-base was thoroughly investigated approach. both conventional characterised analysed simultaneously. A thermal conductivity enhancement 3% achieved using functionalisation method, greater concentration distribution (number particles suspension) 22.7% over procedure. It also 5% decrease dynamic viscosity. On other hand, Mouromtseff number value between 0.7 1.8 obtained at 293 K 373 temperature range, indicating strong capability. apparent from size analysis conducted that produced more stable high fluid. improvement properties Graphical abstract two-step