Abstract
We report extremely large tunable thermal conductivity (k) in alkanes using inverse micellar templating and nanofillers. The thermal properties of n-hexadecane containing inverse micelles of different volume fractions (ϕ) have been studied during freezing and melting. The k enhancement between the solid and liquid phase in the presence of oleic acid, dioctyl sodium sulfosuccinate, and sorbitan oleate inverse micelles (size ∼1.5–6 nm) are found to be 185, 119, and 111%, respectively. Unlike the conventional nanofluids, the k enhancement in micellar templated alkanes is perfectly reversible under repeated thermal cycling owing to the monodispersity and nonaggregating nature of micelles. Our results suggest that during the first-order phase transition, the inverse micelles with highly packed linear chain surfactant are pushed to the intercrystal boundaries of alkanes, thereby reducing the interfacial thermal resistance. The k contrasts in surface modified graphite nanofibers and multiwalled carbon nanotube i...
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