Thermal characterization of vertical interface by scanning photothermal radiometry.

In this work, scanning photothermal radiometry is used for imaging and to characterize a submicron crack. From the thermal images, the evolution of the crack is mapped in the space with micrometer resolution. A vertical contact interface at the steel-steel junction is used to represent a micro-crack with a thickness less than 0.

Thermal imaging by scanning photothermal radiometry.

In this work, a modulated photothermal radiometry principle is applied in a scanning configuration. This technique was developed with the aim of performing imaging and thermal characterization at the microscale and exploring characteristic times lower than those accessible by infrared thermography. The use of a heat source smaller than the measurement area provides high sensitivity to in-plane heat diffusion.

Polymer Supercritical CO Foaming under Peculiar Conditions: Laser and Ultrasound Implementation.

The two-step batch foaming process of solid-state assisted by supercritical CO is a versatile technique for the foaming of polymers. In this work, it was assisted by an out-of-autoclave technology: either using lasers or ultrasound (US). Laser-aided foaming was only tested in the preliminary experiments; most of the work involved US.

Phonon hydrodynamics in crystalline materials.

Phonon hydrodynamics is an exotic phonon transport phenomenon that challenges the conventional understanding of diffusive phonon scattering in crystalline solids. It features a peculiar collective motion of phonons with various unconventional properties resembling fluid hydrodynamics, facilitating non Fourier heat transport. Hence, it opens up several new avenues to enrich the knowledge and implementations on phonon physics, phonon engineering, and micro and nanoelectronic device technologies.

Thermal characterization of diamond films through modulated photothermal radiometry.

Diamond (Dia) films are promising heat-dissipative materials for electronic packages because they combine high thermal conductivity with high electrical resistivity. However, precise knowledge of the thermal properties of the diamond films is crucial to their potential application as passive thermal management substrates in electronics. In this study, modulated photothermal radiometry in a front-face configuration was employed to thermally characterize polycrystalline diamond films deposited onto silicon (Si) substrates through laser-assisted combustion synthesis.