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Title: Bioinspired stretchable molecular composites of 2D-layered materials and tandem repeat proteins
Authors: Vural, Mert
Mazeed, Tarek
Li, Dong
Colak, Oguzhan
Hamilton, Reginald F.
Gao, Huajian
Demirel, Melik C.
Keywords: Engineering::Mechanical engineering
Issue Date: 2022
Source: Vural, M., Mazeed, T., Li, D., Colak, O., Hamilton, R. F., Gao, H. & Demirel, M. C. (2022). Bioinspired stretchable molecular composites of 2D-layered materials and tandem repeat proteins. Proceedings of the National Academy of Sciences of the United States of America, 119(31), e2120021119-.
Project: 002479-00001 
Journal: Proceedings of the National Academy of Sciences of the United States of America
Abstract: Protein based composites, such as nacre and bone, show astounding evolutionary capabilities, including tunable physical properties. Inspired by natural composites, we studied assembly of atomistically thin inorganic sheets with genetically engineered polymeric proteins to achieve mechanically compliant and ultra-tough materials. Although bare inorganic nanosheets are brittle, we designed flexible composites with proteins, which are insensitive to flaws due to critical structural length scale (∼2 nm). These proteins, inspired by squid ring teeth, adhere to inorganic sheets via secondary structures (i.e., β-sheets and α-helices), which is essential for producing high stretchability (59 ± 1% fracture strain) and toughness (54.8 ± 2 MJ/m3). We find that the mechanical properties can be optimized by adjusting the protein molecular weight and tandem repetition. These exceptional mechanical responses greatly exceed the current state-of-the-art stretchability for layered composites by over a factor of three, demonstrating the promise of engineering materials with reconfigurable physical properties.
ISSN: 0027-8424
DOI: 10.1073/pnas.2120021119
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2022 the Author(s). Published by PNAS.This article is distributed under Creative CommonsAttribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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