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Spatial Control of Heat Flow at the Nanoscale Using Janus Particles

Abstract: Janus nanoparticles (JNPs) feature heterogeneous compositions, bringing opportunities in technological and medical applications. We introduce a theoretical approach based on nonequilibrium molecular dynamics simulations and heat transfer continuum theory to investigate the temperature fields generated around heated spherical JNPs covering a wide range of particle sizes, from a few nm to 100 nm. We assess the performance of these nanoparticles to generate anisotropic heating at the nanoscale. We demonstrate that the contrasting interfacial thermal conductances of the fluid-material interfaces arising from the heterogeneous composition of the JNPs can be exploited to control the thermal fields around the nanoparticle, leading to a temperature difference between both sides of the nanoparticle (temperature contrast) that is significant for particles comprising regions with disparate hydrophilicity. We illustrate this idea using coarse-grained and atomistic models of gold nanoparticles with hydrophobic and hydrophilic coatings, in water. Furthermore, we introduce a continuum model to predict the temperature contrast as a function of the interfacial thermal conductance and nanoparticle size. We further show that, unlike homogeneous nanoparticles, the interfacial fluid temperature depends on the interfacial thermal conductance of Janus nanoparticles.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: ACS nano, 2022, 16 (1), 694 - 709

Editorial: American Chemical Society

 Fecha de publicación: 01/01/2022

Nº de páginas: 16

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/acsnano.1c08220

ISSN: 1936-0851,1936-086X

Proyecto español: PGC2018-096649-B-I00

Url de la publicación: https://doi.org/10.1021/acsnano.1c08220