Freeze-dried foam soaks up carbon dioxide

Rice University materials scientists have created a light foam from two-dimensional sheets of hexagonal-boron nitride (h-BN) that absorbs carbon dioxide.They discovered freeze-drying h-BN turned it into a macro-scale foam that disintegrates in liquids. But adding a bit of polyvinyl alcohol (PVA) into the mix transformed it into a far more robust and useful material.The foam is highly porous and its properties can be tuned for use in air filters and as gas absorption materials, accordin