Buscar

Estamos realizando la búsqueda. Por favor, espere...

 Detalle_Publicacion

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.

 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

Autores/as

OLARTE PLATA, JUAN D.

GABRIEL, JORDAN

BRESME, FERNANDO