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Shrilk Shrilk is a compostable material inspired by the insect cuticle and made from discarded shrimp shells and proteins derived from silk. Shrilk is thin, clear, flexible, and strong as aluminum at half the weight.〔Mowatt, Twig (2012) (Inspired by Insect Cuticle, Wyss Researchers Develop Low-Cost Material with Exceptional Strength and Toughness ). Wyss Institute〕 The structure of Shrilk is based in the design and components of the insect cuticle, being an alternative to non-degradable polymers and medical implants.〔Chase, Jon (2012). (As strong as an insect’s shell ). Harvard Gazette〕 Shrilk is produced as films, which can be deposited on patterned molds to impart a specific patterning to the surface, and being able to tune or switch the elasticity allows simple engineering of 3D structures.〔Wylie, Lisa (2011). (Shrilk: A Chimera of Chitosan and Fibroin for Biodegradable Plastics ). Materials Views〕 Shrilk was developed in 2011 at the Wyss Institute for Biologically Inspired Engineering, at Harvard University by the Spanish materials scientist Javier G. Fernandez.〔Ashley, Steven (2013). (9 Materials That Will Change the Future of Manufacturing ). Scientific American〕 Shrilk is an example of biologically inspired engineering.〔Williams, Ann (2013). (Super Materials ). National Geographic〕 It was the first biologically inspired material using a biological design at molecular scale with the biomolecules associated to it.〔Graber, Cynthia (2011). (Insect Cuticle Inspires New Material ). Scientific American〕 == Structure and properties == Shrilk is made by the sequential deposition of fibroin extracted from silk, and chitosan extracted from shrimp shells. The design mimics the layered structure of the insect endocuticle with similar components. The result is a composite with twice the strength of the stronger component (i.e.chitosan) and ten times the strength of both components blend.〔Subbaraman, Nidhi (2011). It can be transparent, translucent or opaque, and can be used as a thermal insulator. 〕
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