The coating neutralizes toxins instantly leaving no hazardous residue, which makes it ideal for use in protective clothing for military personnel and civilians. The coating can also be applied to materials used in filters for water purification, and in wipes for chemical spill clean-ups.
Unlike composite fabrics, where rubber or synthetic alternatives are sandwiched between layers, the NRL approach coats each individual thread before it's woven so that the fabric is treated throughout. This is significant in several ways. It will mean light, comfortable protective clothing that will draw off body moisture when used in warmer climates. And, because the coating is active throughout, it provides better protection against permeation and ensures the integrity of seamed areas on pieced fabric.
One challenge faced by the military is the problem of hazardous materials clean-up and/or disposal should a toxin exposure occur, says NRL principal investigator, Dr. Alok Singh. Coatings that simply collect molecules or toxins from the environment do so selectively and over time can actually produce a hazardous substance during the self-degradation process. The resultant substance can be a more potent toxin because it is then concentrated in the fabric. Because the NRL coating actually neutralizes the molecules on contact during the degradation process, it solves the problem of potentially dangerous and expensive remediation measures.
The NRL coating is actually an ultrathin, layered, composite film (500nm) containing enzymes that actively degrade chemical toxins. Compared to other degradation methods, the enzymes have shown longer active times
Contact: Janice Schultz
Naval Research Laboratory