Abstract
AbstractAerogels are prepared by quantifying the sol–gel process of the organo‐metallic precursors. The objective of the present article is to synthesize ultralow density, low index of refraction, and monolithic silica aerogels. The quantification of hydrophobicity of the silica aerogels using water drop contact angle is not only crucial but also the estimation of the surface free energy is an important parameter to understand the interfacial behavior of the aerogel surface and liquid. To provide insight on this behavior, calculation of the surface free energy is done by using Neumann's equation of state. These synthesized aerogels emerged with ultralow density 24 kg m−3 and low thermal conductivity ∼0.091 W m−1 K−1.
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