Everyday coffee filters do one basic job: catch the grounds and let the liquid pass. Researchers at the ARC Center of Excellence for Carbon Science and Innovation are exploring a filter with a much finer task. Their graphene oxide membrane operates at the nanoscale, and according to a Phys.org report, it removes about half the caffeine from coffee while retaining compounds considered important to the drink.
Because the membrane acts at the molecular level, it could offer a different way to lower caffeine content without relying on traditional processing methods. The report identifies the retained substances only as key compounds, so the specific chemical details are not yet described.
This article is based on a single source, so there are no conflicting reports to compare; the findings are presented as reported by Phys.org.