Abstract
In the current work, the modified sol–gel method is devised in nano-silica preparation, followed by the one-step method for silica nanofluid preparation, using rice husk (RH) as a silica source. In this regard, DIW-washed and dried RH undergoes acid treatment, followed by DIW washing, drying, and incineration to obtain micron-range RH ash (RHA), which is used in the sol-formation step. In the gel formation step, optimized titrant 2% H2SO4 is employed, and the formed gel undergoes 24 h aging, followed by defragmentation, washing, and overnight refrigeration. For nanofluid preparation, the molten frozen gel is dispersed in water, and prolonged ultrasonic dual mixing is applied for nanoparticle deagglomeration, resulting in one-step nanofluid preparation. With and without dispersant, silica nanofluid is prepared and characterized. The nanoparticle characterization involves functional group, amorphous state, morphology, and elemental composition determination. The prepared nanofluid is observed visually for the Settling and the Tyndall effect. The thermophysical properties, thermal conductivity, surface tension, and viscosity are determined. The particle size distribution in nanofluid is determined through DLS analysis. The stability of the nanofluid is determined through zeta potential analysis. Through these assessments of nanofluid, its suitability in bulk application is indirectly validated.
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Kumar, P., Chakraborty, S. (2023). Rice Husk-Derived Silica Nanoparticles Using Optimized Titrant Concentration for the One-Step Nanofluid Preparation. In: Chinthapudi, E., Basu, S., Thorat, B.N. (eds) Sustainable Chemical, Mineral and Material Processing. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-7264-5_24
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