Photochromic transparent membranes with reversible color switching and pronounced permeability change are demonstrated by K. Schöller, L. Scherer, and co-workers on page 5194. Lightresponsive spiropyran and spirooxazine derivatives are introduced to amphiphilic polymer co-networks to achieve the stimuli-responsive behavior of the delivery membrane and a similar heterophase structure and permeability like natural skin (shown in the picture). These properties are requested when applied as a “smart” lightresponsive membrane in a transdermal caffeinedelivery system for pre-term neonates.
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