Freeze-Dried Boron Nitride Foam Soaks Up Carbon Dioxide

A light foam was created from two-dimensional sheets of hexagonal-boron nitride (h-BN) that absorbs carbon dioxide. Freeze-drying h-BN turned it into a macro-scale foam that disintegrates in liquids. Adding a bit of polyvinyl alcohol (PVA) into the mix transformed it into a far more robust and useful material.