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Development of bio-hybrid piezoresistive nanocomposites using silk-elastin protein copolymers

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Resumo:Recombinant silk-elastin-like protein (SELP)/carbon nanotubes (CNTs) nanocomposite films with different amounts of CNTs (1, 3 and 6wt%) were prepared by solvent casting. The produced films were stabilized by exposure to methanol that induces an increase of the -structure content. The CNTs were homogeneously distributed into the SELP matrix and did not induce significant alterations into its chemical structure. The incorporation of CNTs also increased the thermal stability of the films. Further, the incorporation of 1wt% of CNTs greatly improved the mechanical properties of the SELP matrix leading to a 6-fold increase in strain-to-failure and to increase the ultimate tensile strength with minor differences in modulus of elasticity. The nanocomposites exhibited a good linearity between deformation and electrical resistance variation with electrical conductivity increasing with the nanofiller content up to 0.8Sm1. Finally, the produced nanocomposites were non-cytotoxic indicating their suitability for biomedical applications.
Autores principais:Correia, Daniela M.
Outros Autores:Ribeiro, S.; Costa, André da; Ribeiro, Clarisse; Casal, Margarida; Lanceros-Méndez, S.; Machado, Raul
Assunto:CNTs Electromechanical Gauge factor Nanocomposites Piezoresistive Protein-based SELP Silk-elastin-like protein
Ano:2019
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho
Descrição
Resumo:Recombinant silk-elastin-like protein (SELP)/carbon nanotubes (CNTs) nanocomposite films with different amounts of CNTs (1, 3 and 6wt%) were prepared by solvent casting. The produced films were stabilized by exposure to methanol that induces an increase of the -structure content. The CNTs were homogeneously distributed into the SELP matrix and did not induce significant alterations into its chemical structure. The incorporation of CNTs also increased the thermal stability of the films. Further, the incorporation of 1wt% of CNTs greatly improved the mechanical properties of the SELP matrix leading to a 6-fold increase in strain-to-failure and to increase the ultimate tensile strength with minor differences in modulus of elasticity. The nanocomposites exhibited a good linearity between deformation and electrical resistance variation with electrical conductivity increasing with the nanofiller content up to 0.8Sm1. Finally, the produced nanocomposites were non-cytotoxic indicating their suitability for biomedical applications.