Boron
nitride nanotubes (BNNTs), structural analogues of carbon
nanotubes, have attracted significant attention due to their superb
thermal conductivity, wide bandgap, excellent hydrogen storage capacity,
and thermal and chemical stability. Despite considerable progress
in the preparation and surface functionalization of BNNTs, it remains
a challenge to assemble one-dimensional BNNTs into three-dimensional
(3D) architectures (such as aerogels) for practical applications.
Here, we report a highly compressive BNNT aerogel reinforced with
reduced graphene oxide (rGO) fabricated using a freeze-drying method.
The reinforcement effect of rGO and 3D honeycomb-like framework offer
the BNNTs/rGO aerogel with a high compression resilience. The BNNTs/rGO
aerogels were then infiltrated with polyethylene glycol to prepare
a kind of phase change materials. The prepared phase change material
composites show zero leakage even at 100 °C and enhanced thermal
conductivity, due to the 3D porous structure of the BNNTs/rGO aerogel.
This work provides a simple method for the preparation of 3D BNNTs/rGO
aerogels for many potential applications, such as high-performance
polymer composites.
In order to evaluate the fracture toughness of a Zr 55 Al 10 Ni 5 Cu 30 bulk metallic glass and to identify possible sources associated with data variability of Zr-based metallic glasses, three-point bending (3PB) precracked and notched specimens with thicknesses of 2.0 to 2.9 mm were prepared. Miniaturized 34 specimens were subjected to plane strain fracture toughness tests at room temperature.
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