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Issue 2, 2020
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Genetically engineered protein based nacre-like nanocomposites with superior mechanical and electrochemical performance

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Abstract

The molecular engineering of proteins at the atomistic scale with specific material binding units and the introduction of designed functional-linkers provides a unique approach to fabricate genetically modified high performance and responsive biomimetic composites. This work is inspired by a tough biological material, nacre, which possesses a hierarchical ‘brick-mortar’ architecture containing multifunctional soft organic molecules, which plays a significant role in improved mechanical properties of composites. A bio-inspired composite, using a resilin-based hybrid protein polymer with selective binding motifs for reduced graphene oxide (RGO) and nanofibrillated cellulose (NFC), was developed. The adhesive and elastic domains of fusion proteins show a synergistic effect with improvement in both the strength and toughness of synthetic nacre. We observed that the hybrid protein could act as a spacer molecule tuning the ion sorption and transport across the inter-layers of NFC/RGO depending on the processing conditions. Interestingly, the protein complexed freestanding solid-state films showed negligible internal resistance and improved supercapacitance suitable for flexible electronic devices. The protein-mediated binding of NFC and RGO reduces the resistance arising from poor electrode/electrolyte interfaces, which is difficult to achieve through conventional routes. The current biosynthetic route for engineering proteins provides a novel prospect to develop materials programmed with desired properties, depending on target applications.

Graphical abstract: Genetically engineered protein based nacre-like nanocomposites with superior mechanical and electrochemical performance

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Supplementary files

Article information


Submitted
02 Oct 2019
Accepted
19 Nov 2019
First published
19 Nov 2019

This article is Open Access

J. Mater. Chem. A, 2020,8, 656-669
Article type
Paper

Genetically engineered protein based nacre-like nanocomposites with superior mechanical and electrochemical performance

P. Dhar, J. Phiri, G. R. Szilvay, A. Westerholm-Parvinen, T. Maloney and P. Laaksonen, J. Mater. Chem. A, 2020, 8, 656
DOI: 10.1039/C9TA10881E

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