Making Biomolecular Crystals Soft and Self-healing — Just Add Polymer

In the world of engineering, crafting a material that meets the needs of your application is challenging. Often, a given material may only provide a handful of the required properties for that application. Instead, you may choose to combine two or more materials, forming a composite with all of your desired properties. In this week’s paper, Zhang and coworkers from the University of California at San Diego took a similar approach in the world of biology by combining a biomolecular crystal with a flexible polymer. The crystal provides structure to the composite and the polymer contributes to its flexibility and expandability. They showed that the composite could reversibly expand to nearly 570% of its original volume and unexpectedly found that it was self-healing.

“Precise” Polymers Promote Fast Proton Transport

One of the greatest challenges of making proton exchange membrane fuel cells is designing the membrane after which they are named. Engineers would love to have a membrane that transports protons quickly and efficiently. Although there are polymeric materials (e.g. Nafion) that can do this fairly well, there is still a need for faster transport. This week’s paper investigates the role of a polymer’s “precise” structure in facilitating fast proton transport.