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We present the coefficient of viscosity (), entropy (S) and viscosity to entropy density (s) ratio () for aqueous silver nanoparticle (AgNP) solution at temperatures T = 273–300 K performing experiments and examining the same with discrete dipole approximation (DDA) simulation. The experimental UV-Visible dipole extinction spectra of the nanoliquid, matched with simulations, explore cluster morphologies. The latter is used for the calculation of(cluster volume fraction ~ 4–10%; NP, cluster radii 8–15 nm and 35–55 nm, respectively). In addition, dimer (AgNP-AgNP) formation free energy and S are explored at those T’s. We determineratio exploiting nanoparticle behaviour. The value ofis found lower than that of water and similar to strongly correlated liquid He 4 , owing to higher S for NP agglomeration. Our results of, S andare also corroborated from hard sphere model calculation. This, to the best of our knowledge, is the first attempt to determinein NP.

Viscosity to entropy density ratio ($\eta$/s) in nanoliquid