Ion-Specific Assembly of Strong, Tough, and Stiff Biofibers.
Angew Chem Int Ed Engl
; 58(51): 18562-18569, 2019 12 16.
Article
em En
| MEDLINE
| ID: mdl-31600016
ABSTRACT
Designing engineering materials with high stiffness and high toughness is challenging as stiff materials tend to be brittle. Many biological materials realize this objective through multiscale (i.e., atomic- to macroscale) mechanisms that are extremely difficult to replicate in synthetic materials. Inspired from the architecture of such biological structures, we here present flow-assisted organization and assembly of renewable native cellulose nanofibrils (CNFs), which yields highly anisotropic biofibers characterized by a unique combination of high strength (1010â
MPa), high toughness (62â
MJ m-3 ) and high stiffness (57â
GPa). We observed that properties of the fibers are primarily governed by specific ion characteristics such as hydration enthalpy and polarizability. A fundamental facet of this study is thus to elucidate the role of specific anion binding following the Hofmeister series on the mechanical properties of wet fibrillar networks, and link this to the differences in properties of dry nanostructured fibers. This knowledge is useful for rational design of nanomaterials and is critical for validation of specific ion effect theories. The bioinspired assembly demonstrated here is relevant example for designing high-performance materials with absolute structural control.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Nanofibras
/
Íons
Limite:
Humans
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Suécia