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Exclusion and Trapping of Carbon Nanostructures in Non-Isotropic Suspensions of Cellulose Nanostructures.

08:00 EDT 2nd April 2019 | BioPortfolio

Summary of "Exclusion and Trapping of Carbon Nanostructures in Non-Isotropic Suspensions of Cellulose Nanostructures."

Incorporation of carbon nanotubes (CNT) into liquid crystalline (LC) phases of cellulose nanostructures (CNCs) may be used for preparation of hybrids with novel optical, electrical and mechanical properties. Here we investigated the effect of nanoparticle diameter, geometry, aspect ratio and flexibility on the exclusion of dispersed carbon nanostructures (CNS) from the chiral nematic phase (N*) of the CNCs. While CNS are nicely dispersed in isotropic suspensions of CNS, we observe that fullerenes, carbon black and CNT are depleted from the N* phase. This observation is surprising as theoretical predictions and previous observations of nanoparticles indicate that nanometric inclusions would be incorporated within the N* phase. Cryo-TEM imaging reveal that the dispersed CNS induce miss- orientation of the CNCs irrespective of their geometry and size. Rheological measurements suggest that about 10% of the CNCs are affected by the CNS. The multi-particle nature of the interaction may be the origin of the non-size selective exclusion of the CNS. Re-entrant behavior is observed at high CNCs concentrations (about 13 wt%) where a (nematic) gel-like phase kinetically traps the CNS. These phases exhibit non-Newtonian flow behavior, and birefringence, offering a pathway for preparation of non-isotropic CNCs-CNTs composites and thin films via liquid processing.

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This article was published in the following journal.

Name: The journal of physical chemistry. B
ISSN: 1520-5207
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