Abstract
Herein is reported a method for fabricating <10 mg/cm3 silver aerogels via the freeze casting of aqueous nanowire suspensions followed by freeze substitution and supercritical drying. This method overcomes the limitations of traditional freeze drying and yields highly uniform, crack-free monoliths that undergo no measurable shrinkage with excellent mold reproduction. Significantly, freeze substitution enables the use of high concentrations of cryoprotectants to control the freezing process and, hence, the pore architecture of the resulting aerogels. Due to its physical nature, this method is applicable to the fabrication of materials with a broad range of compositions.
Highlights
Ultra-low-density (ULD) materials with monolith densities of
A synthesis of ULD materials from nanoparticulate suspensions has recently been reported by Jung et al.,[16] who have demonstrated a novel family of aerogel materials made via spontaneous gelation of nanoparticle suspensions above their percolation threshold, which, for 1D nanomaterials, is inversely proportional to the nanoparticle aspect ratio.[17]
Spherical aerogels were drop-cast directly into liquid N2, where the Leidenfrost effect causes the droplets to rapidly rotate on top of the liquid N2 until temperature equilibration
Summary
Ultra-low-density (ULD) materials with monolith densities of
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