Reference : Enhancing Self-Assembly in Cellulose Nanocrystal Suspensions Using High-Permittivity ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Physics and Materials Science
http://hdl.handle.net/10993/28654
Enhancing Self-Assembly in Cellulose Nanocrystal Suspensions Using High-Permittivity Solvents
English
Bruckner, Johanna mailto []
Kuhnhold, Anja mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Honorato Rios, Camila mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Schilling, Tanja mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Lagerwall, Jan mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
29-Aug-2016
Langmuir
American Chemical Society
Yes (verified by ORBilu)
International
0743-7463
1520-5827
Washington
DC
[en] cellulose nanocrystals ; cholesteric liquid crystals ; solvents
[en] Helical liquid crystal self-assembly in suspensions of cellulose nanocrystals (CNCs), bioderived nanorods exhibiting excellent mechanical and optical properties, opens attractive routes to sustainable production of advanced functional materials. For convenience, in most studies until now, the CNCs were suspended in water, leaving a knowledge gap concerning the influence of the solvent. Using a novel approach for aggregation-free solvent exchange in CNC suspensions, here we show that protic solvents with a high dielectric permittivity εr significantly speed up self-assembly (from days to hours) at high CNC mass fraction and reduce the concentration dependence of the helix period (variation reducing from more than 30 μm to less than 1 μm). Moreover, our computer simulations indicate that the degree of order at constant CNC content increases with increasing εr, leading to a shorter pitch and a reduced threshold for liquid crystallinity. In low-εr solvents, the onset of long-range orientational order is coupled to kinetic arrest, preventing the formation of a helical superstructure. Our results show that the choice of solvent is a powerful parameter for tuning the behavior of CNC suspensions, enhancing our ability to control the self-assembly and thereby harvesting valuable novel cellulose-based materials.
University of Luxembourg: High Performance Computing - ULHPC
Fonds National de la Recherche - FnR ; Dr. Leni Schöninger Stiftung
Researchers ; Professionals
http://hdl.handle.net/10993/28654
10.1021/acs.langmuir.6b02647
FnR ; FNR8331546 > Jan Peter Felix Lagerwall > MISONANCE > Materials Innovation with Self-Ordered NanoCellulose: from fundamental physics of self-assembly to realization of commercially appealing functional films > 01/02/2015 > 31/01/2018 > 2014

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