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Janus nanoparticles (JNPs) with heterogeneous compositions or interfacialproperties can exhibit directional heating upon external excitation, such aslaser radiation and magnetic field. This directional heating may be harnessedfor new nanotechnology and biomedical applications. Understanding thermaltransport and temperature control with JNP heating is critical for theseadvances. Here, we developed a numerical framework to analyze the asymmetricthermal transport in JNP heating under photothermal stimulation. We found thatJNP-induced temperature contrast, defined as the ratio of temperature increasein the surrounding water, shows a substantial size and polar angle dependence.Notably, we discovered a significant enhancement of the temperature contrastunder pulsed heating due to thermal confinement, compared with the continuousheating. This work brings new insights into the thermal responses of JNPheating and advances the field.

Regulating nanoscale heat transfer with Janus nanoparticles