W dniu 22.03.2019 Rada Wydziału Inżynierii Materiałowej i Ceramiki Akademii Górniczo-Hutniczej w Krakowie podjęła uchwałę o nadaniu dr Igorowi Iatsunskiemu stopnia doktora habilitowanego w dziedzinie nauk technicznych, w dyscyplinie inżynieria materiałowa.
Heat conduction in silicon can be effectively engineered by means of sub-micrometre porous thin free-standing membranes. Tunable thermal properties make these structures good candidates for integrated heat management units such as waste heat recovery, rectification or efficient heat dissipation. However, possible applications require detailed thermal characterisation at high temperatures which, up to now, has been an experimental challenge. In this work we use the contactless two-laser Raman thermometry to study heat dissipation in periodic porous membranes at high temperatures via lattice conduction and air-mediated losses. We find the reduction of the thermal conductivity and its temperature dependence closely correlated with the structure feature size. On the basis of two-phonon Raman spectra, we attribute this behaviour to diffuse (incoherent) phonon-boundary scattering. Furthermore, we investigate and quantify the heat dissipation via natural air-mediated cooling, which can be tuned by engineering the porosity.
The Organizing Committee of the NanoTech Poland 2019, 5th-8th June 2019 held in Poznań, has a great pleasure to invite you to attend this scientific event and to enjoy the community of professionals in the field of nanoscience and nanotechnology.