Mesoscopic friction and network morphology control the mechanics and processing of carbon nanotube yarns

Yuezhou Wang, Hao Xu, Grigorii Drozdov, Traian Dumitrica

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Carbon nanotube (CNT) yarns are synthetic nanomaterials of interest for diverse applications. To bring fundamental understanding into the yarn formation process, we perform mesoscopic scale distinct element method (mDEM) simulations for the stretching of CNT networks. The parameters used by mDEM, including the mesoscale friction, are based on full atomistic results. By bridging across the atomistic and mesoscopic length scales, our model predicts accurately the mechanical response of the network over a large deformation range. At small and moderate deformations, the microstructural evolution is dominated by zipping relaxations directed along the applied strain direction. At larger deformations, the occurrence of energetic elasticity promotes yarn densification, by lowering CNT waviness and eliminating squashed pores. Next, by varying the mesoscopic dissipation as well as the network structure, we reveal that the mesoscale friction and film morphology are key factors for the yarn formation: While lack of friction compromises the strain-induced alignment process, phononic and polymeric friction promote CNT alignment by enabling load transfer and directed zipping relaxations, especially in networks containing long and entangled CNTs. Yarns drawn from cellular networks are shown instead to maintain high porosity, even with enhanced polymeric friction.

Original languageEnglish (US)
Pages (from-to)94-104
Number of pages11
JournalCarbon
Volume139
DOIs
StatePublished - Nov 1 2018

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Carbon Nanotubes
Yarn
Carbon nanotubes
Mechanics
Friction
Processing
Microstructural evolution
Densification
Nanostructured materials
Stretching
Elasticity
Porosity

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Mesoscopic friction and network morphology control the mechanics and processing of carbon nanotube yarns. / Wang, Yuezhou; Xu, Hao; Drozdov, Grigorii; Dumitrica, Traian.

In: Carbon, Vol. 139, 01.11.2018, p. 94-104.

Research output: Contribution to journalArticle

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