Figure 1
From: Poly(vinyl alcohol) freeze casts with nano-additives as potential thermal insulators
SEM images of the material morphologies: parallel and cross cuts. All materials were prepared using 10 wt.% PVA. Red arrows represent the freezing direction. (a) and (b) pure PVA, (c) and (d) SiO2/PVA, (e) and (f) MFC/PVA, (g) and (h) NC/PVA.
