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Nanoscale Assembly of Cellulose Nanocrystals during Drying and Redispersion
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden..
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden..
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden..
Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.;Univ Hamburg, Ctr Free Electron Laser Sci, DE-22761 Hamburg, Germany..
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2018 (English)In: ACS Macro Letters, E-ISSN 2161-1653, Vol. 7, no 2, p. 172-177Article in journal (Refereed) Published
Abstract [en]

We have followed the structural evolution during evaporation-induced self-assembly of sulfonated cellulose nanocrystal (CNC) in the presence of H+ and Li+ counterions by small-angle X-ray scattering. Drying of CNC-H dispersions results in ordered films that could not be readily redispersed, while the CNC-Li films were disordered and prone to reswelling and redispersion. The scaling of the separation distance (d) between CNC particles and the particle concentration (c) shows that the CNC-H dispersions display a unidimensional contraction of the nematic structure (d alpha c(-1)) during drying, while the CNC-Li dispersions consolidate isotropically (d alpha c(-1/3)), which is characteristic for hydrogels with no preferential orientation. Temporal evolution of the structure factor and complementary dynamic light-scattering measurements show that CNC-Li is more aggregated than CNC-H during evaporation-induced assembly. Insights on the structural evolution during CNC assembly and redispersion can promote development of novel and optimized processing routes of nanocellulose-based materials.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 7, no 2, p. 172-177
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Physical Chemistry
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URN: urn:nbn:se:kth:diva-225315DOI: 10.1021/acsmacrolett.7b00964ISI: 000426013900009Scopus ID: 2-s2.0-85042367355OAI: oai:DiVA.org:kth-225315DiVA, id: diva2:1195239
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QC 20180404

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-04-04Bibliographically approved

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