Photos: Pulp meets nanotech

The researchers proved the material's use as a low-cost nontoxic photocatalyst--a substance that can regenerate its chemical composition after exposure to light. They compared the paper's write-erase capability against regular printing paper. Window A shows a piece of nanopaper written on with water-based ink. The second photo is of the same paper after a 15-minute exposure to UV irradiation.

Photo by University of Arkansas