The charge density plot partly helps to answer why we see polarization-induced enhancement in thermal conductance. Adsorbed water layers have orientational preferences at interfaces, and with a polarizable metal surface, these preferences point partial charges from the water directly at the surface, creating opposing image charges at the interface. The image charge effect increases the effective interaction strength between the water and the metal. What Fig. also shows is that in the nanospheres, this effect is approximately a factor of four larger than in the planar interface, which goes a long way to explaining the 2.5 -4.1× jump in G values between the two systems.