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Assembly of cellulose nanocrystals in a levitating drop probed by time-resolved small angle X-ray scattering
Stockholm University, Sweden; Wallenberg Wood Science Center, Sweden.
Stockholm University, Sweden; University Of Hamburg, Germany.
University of Oslo, Norway.
Stockholm University, Sweden.
Show others and affiliations
2018 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 10, no 38, p. 18113-18118Article in journal (Refereed) Published
Abstract [en]

Assembly of bio-based nano-sized particles into complex architectures and morphologies is an area of fundamental interest and technical importance. We have investigated the assembly of sulfonated cellulose nanocrystals (CNC) dispersed in a shrinking levitating aqueous drop using time-resolved small angle X-ray scattering (SAXS). Analysis of the scaling of the particle separation distance (d) with particle concentration (c) was used to follow the transition of CNC dispersions from an isotropic state at 1-2 vol% to a compressed nematic state at particle concentrations above 30 vol%. Comparison with SAXS measurements on CNC dispersions at near equilibrium conditions shows that evaporation-induced assembly of CNC in large levitating drops is comparable to bulk systems. Colloidal states with d vs. c scalings intermediate between isotropic dispersions and unidirectional compression of the nematic structure could be related to the biphasic region and gelation of CNC. Nanoscale structural information of CNC assembly up to very high particle concentrations can help to fabricate nanocellulose-based materials by evaporative methods.

Place, publisher, year, edition, pages
2018. Vol. 10, no 38, p. 18113-18118
Keywords [en]
Cellulose, Cellulose derivatives, Dispersions, Drops, Gelation, Nanocrystals, Particle size, Cellulose nano-crystals, Cellulose nanocrystal (CNC), Equilibrium conditions, Particle concentrations, Particle separation distance, Structural information, Time resolved small-angle x-ray scattering, Unidirectional compression, X ray scattering
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:ri:diva-37282DOI: 10.1039/c8nr05598jScopus ID: 2-s2.0-85054469334OAI: oai:DiVA.org:ri-37282DiVA, id: diva2:1280367
Note

Fundingdetalis: Wallenberg Wood Science Center, WWSC; Funding details: Vetenskapsrådet, VR, 20140492; Funding details: Vetenskapsrådet, VR, 20130343; Funding details: Alexander von Humboldt-Stiftung;

Available from: 2019-01-18 Created: 2019-01-18 Last updated: 2019-03-29Bibliographically approved

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