Crab-on-a-Tree: All Bio-Renewable, Optical-and-Radio Frequency Transparent Barrier Nanocoating for Food Packaging
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초록
내용
Plastic packaging effectively protects foods from mechanical, microbial, and chemical damage, but oxygen permeates these plastics to degrade foods. Improving the gas barrier usually requires metallic or halogenated polymeric coatings; however, both often cause environmental problems and block visible light and electromagnetic signals. We report a unique design of a highly flexible and visible light and radio wave transparent coating based on biomaterials exclusively. By taking advantages of the spray-assisted layer-by-layer assembly of cellulose nanofibers and chitin nanowhiskers, we achieved the OTR value less than 0.5 mLm-2day-1. The significant barrier properties are attributed to the synergetic interplay between the highly crystalline bio-nanomaterials and they were maintained even under various conditions. This “crab-on-a-tree” nanocoating holds high potential as a biocompatible and optical-and-digital transparent future packaging application.