@article{10902/31446,
year = {2022},
month = {1},
url = {https://hdl.handle.net/10902/31446},
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.},
organization = {We thank the Leverhulme Trust (UK grant RPG-2018-384) and the Spanish national project (Grant No. PGC2018-096649-B-I) for financial support, the UK Materials and Molecular Modelling Hub for computational resources partially funded by the EPSRC UK (EP/P020194/1 and EP/T022213/1), and the Imperial College RCS High-Performance Computing facility. In addition, F.B. acknowledges financial support from EPSRC UK (EP/J003859/1), and P.A. acknowledges funding from a Ramon y Cajal Fellowship (Grant No. RYC-2016-20831).},
publisher = {American Chemical Society},
publisher = {ACS Nano, 2022, 16 (1),  694-709},
title = {Spatial control of heat flow at the nanoscale using Janus particles},
author = {Olarte Plata, Juan D. and Gabriel, Jordan and Albella Echave, Pablo and Bresme, Fernando},
}