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Thursday, 02 October 2014

Dr. José Ordónez Miranda offered an ICN2 Seminar on heat conduction across dielectric nanofilms

Miniaturization of devices with enhanced rates of operation requires a profound understanding of their thermal performance. The speaker was invited by the ICN2 Phononic and Photonic Nanostructures (P2N) Group, led by ICREA Research Prof. Clivia Sotomayor-Torres Group, and presented by Dr. Juan Sebastian Reparaz.

The blossoming of nanotechnology involving the miniaturization of devices with enhanced rates of operation requires a profound understanding of their thermal performance. This is particularly critical in nanomaterials, in which the heat transport is not necessarily described by the Fourier’s law of heat conduction. Dr. José Ordónez Miranda, from the Laboratoire d’Energétique Moléculaire et Macroscopique, Combustion at the Ecole Centrale Paris (France), offered today a Seminar on microscopic description of heat conduction across dielectric nanofilms. He was invited by the ICN2 Phononic and Photonic Nanostructures (P2N) Group, led by ICREA Research Prof. Clivia Sotomayor-Torres Group, and presented by Dr. Juan Sebastian Reparaz.

The speaker presented a nonlocal theory for heat conduction across dielectric nanofilms excited with a laser of modulated intensity to explain the reduction of their thermal conductivity observed in recent experiments. This theory is a novel and analytical solution of the Boltzmann transport equation for phonons in a dielectric film. The theory presented by Dr. José Ordónez Miranda facilitates the understanding of heat conduction across dielectric nanofilms excited at high frequencies. It could be used as the theoretical model to perform the microscopic characterization of nanofilms, through the determination of the mean free path (MFP) and mean free time (MFT) of phonons.