Abstract
High torsional strength fibers are of practical interest for applications such as artificial muscles, electric generators, and actuators. Herein, we maximize torsional strength by understanding, measuring, and overcoming rheological thresholds of nanocarbon (nanotube/graphene oxide) dopes. The formed fibers show enhanced structure across multiple length scales, modified hierarchy, and improved mechanical properties. In particular, the torsional properties were examined, with high shear strength (914 MPa) attributed to nanotubes but magnified by their structure, intercalating graphene sheets. This design approach has the potential to realize the hierarchical dimensional hybrids, and may also be useful to build the effective network structure of heterogeneous materials.
Highlights
High torsional strength fibers are of practical interest for applications such as artificial muscles, electric generators, and actuators
The nanocarbons family of carbon nanotubes (CNTs), graphene oxide (GO), and reduced graphene oxide are classic species used for fibers[3], owing to their superlative intrinsic mechanical properties
This behavior may be best illustrated by the dynamic rheological changes seen upon altering the geometry of a fraction of the nanocarbons, by replacing GO with CNTs
Summary
High torsional strength fibers are of practical interest for applications such as artificial muscles, electric generators, and actuators. The torsional properties were examined, with high shear strength (914 MPa) attributed to nanotubes but magnified by their structure, intercalating graphene sheets This design approach has the potential to realize the hierarchical dimensional hybrids, and may be useful to build the effective network structure of heterogeneous materials. While microscale solution control provides a degree of structure, nanoscale heterogeneity generally limits the long-range orientational order, generating grain boundaries (bulges/slides) or pores during shear-induced flow. These defects result in fluctuation of the viscoelastic properties during the transformation from the liquid to solid state[18,19,20], causing structural distortion in the form of coupling density fluctuations and deformation fields
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