Bartlomiej Graczykowski

Abstract Two-dimensional phononic crystals (PnCs) formed by a periodic array of holes in a suspended membrane have previously been used to coherently control thermal conductance at low temperatures by modifying the phonon dispersion, thereby altering the phonon group velocities and the density of states. Here, in contrast, we demonstrate that PnCs formed by a periodic array of aluminium pillars on an uncut silicon nitride membrane can also be used to achieve similar coherent control.

Introduction Polymer nanocomposites feature an array of properties─including enhanced mechanical strength, (1−3) thermal stability, (3,4) and ductility (2)─which are superior to those of analogous unfilled polymers.

Nanoparticle Shear Elastic Modulus Figure 1 shows the anti-Stokes side of the BLS spectra of four different close-packed clusters of core–shell NPs, PS–PS, PS–PMMA8, PS–PBMA7, and PS–PBMA34, at 294 K with the particle size information listed in Table 1. For all core–shell NPs, the diameter was obtained from the SEM images, averaging the size of 100 randomly chosen particles.