11:30 〜 11:45
▼ [15a-B12-8] Thermal Conductivity of SiNCs/Polymer Nanocomposite for Thermal Insulating Material
キーワード：silicon nanocrystals, thermal conductivity, nanocomposite
Low-dimensional nanostructured materials has been recently researched for phonon thermal transport reduction. Phonon thermal transport can be explained based on the size ratio of material characteristic size to the standard mean free path (MFP) of phonon, and simply considered as particles and wave. Nanostructured materials that have characteristic size much smaller than MFP and comparable with phonon wavelength has been observed for phonon wave control that dramatically reduce thermal transport, due to phenomena called interference or phonon band folding effect. In the other hand, silicon nanocrystals (SiNCs) showed promising result of adjustable thermal conductivity properties of silicon, by controlling the grain size.
In this work, SiNCs with mean size of 6 nm were produced and dispersed into the polymer matrix to produce nanocomposite, overall thermal conductivity of nanocomposite is expected to decrease significantly. SiNCs particle size is much smaller than phonon MFP, creates significant increase of phonon scattering that suppresses the thermal transport, called ballistic transport. Furthermore, by dispersing SiNCs within the polymer matrix, nanostructured polymer networks is formed, and phonons or lattice vibration, which are carried through polymer networks, experience significant scattering at SiNCs/polymer boundaries. Finally, with size less than 10 nm, which is comparable to phonon wavelength (~1nm, RT), phonons’ experience interference/confinement effect, which is reported reduce thermal transport dramatically.
In this work, SiNCs with mean size of 6 nm were produced and dispersed into the polymer matrix to produce nanocomposite, overall thermal conductivity of nanocomposite is expected to decrease significantly. SiNCs particle size is much smaller than phonon MFP, creates significant increase of phonon scattering that suppresses the thermal transport, called ballistic transport. Furthermore, by dispersing SiNCs within the polymer matrix, nanostructured polymer networks is formed, and phonons or lattice vibration, which are carried through polymer networks, experience significant scattering at SiNCs/polymer boundaries. Finally, with size less than 10 nm, which is comparable to phonon wavelength (~1nm, RT), phonons’ experience interference/confinement effect, which is reported reduce thermal transport dramatically.