Self-assembling biometric membranes may aid water filtration

According to an international team of researchers at Penn State University a synthetic membrane that self assembles and is easily produced may lead to better gas separation and water purification.

The biomimetic membrane is composed of lipids - fat molecules - and protein-appended molecules that form water channels that transfer water at the rate of natural membranes, and self-assembles into 2-dimensional structures with parallel channels.

Second generation

The researchers developed a second-generation synthetic water channel that improves on earlier attempts to mimic aquaporins - natural water channel proteins - by being more stable and easier to manufacture. The peptide-appended pillar arenes (PAP) are also more easily produced and aligned than carbon nanotubes, another material under investigation for membrane separation.

The researchers consider that the PAP membranes are an order of magnitude better than the first-generation artificial water channels reported to date. The propensity for these channels to form densely packed arrays automatically leads to a variety of engineering applications, in particular water purification membranes.