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Understanding the Dispersive Action of Nanocellulose for Carbon Nanomaterials
KTH Royal Institute Technology, Sweden.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-1503-8293
KTH Royal Institute Technology, Sweden.
KTH Royal Institute Technology, Sweden.
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2017 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 17, no 3, 1439-1447 p.Article in journal (Refereed) Published
Abstract [en]

This work aims at understanding the excellent ability of nanocelluloses to disperse carbon nanomaterials (CNs) in aqueous media to form long-term stable colloidal dispersions without the need for chemical functionalization of the CNs or the use of surfactant. These dispersions are useful for composites with high CN content when seeking water based, efficient, and green pathways for their preparation. To establish a comprehensive understanding of such dispersion mechanism, colloidal characterization of the dispersions has been combined with surface adhesion measurements using colloidal probe atomic force microscopy (AFM) in aqueous media. AFM results based on model surfaces of graphene and nanocellulose further suggest that there is an association between the nanocellulose and the CN. This association is caused by fluctuations of the counterions on the surface of the nanocellulose inducing dipoles in the sp(2) carbon lattice surface of the CNs. Furthermore, the charges on the nanocellulose will induce an electrostatic stabilization of the nanocellulose-CN complexes that prevents aggregation. On the basis of this understanding, nanocelluloses with high surface charge density were used to disperse and stabilize carbon nanotubes (CNTs) and reduced graphene oxide particles in water, so that further increases in the dispersion limit of CNTs could be obtained. The dispersion limit reached the value of 75 wt % CNTs and resulted in high electrical conductivity (515 S/cm) and high modulus (14 GPa) of the CNT composite nanopapers.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 17, no 3, 1439-1447 p.
Keyword [en]
Nanocellulose; carbon nanotubes; graphene; interaction; surface charge; conductivity; counterions
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-136050DOI: 10.1021/acs.nanolett.6b04405ISI: 000396185800018PubMedID: 28170274OAI: oai:DiVA.org:liu-136050DiVA: diva2:1084864
Note

Funding Agencies|Wallenberg Wood Science Center

Available from: 2017-03-27 Created: 2017-03-27 Last updated: 2017-03-27

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CiteExportLink to record
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