Reference : Macroscopic control of helix orientation in films dried from cholesteric liquid cryst...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Macroscopic control of helix orientation in films dried from cholesteric liquid crystalline cellulose nanocrystal suspensions

Park, Ji Hyun [Seoul National University]
Noh, Junghyun mailto [Seoul National University]
Schütz, Christina [Stockholm University]
Salazar-Alvarez, German [Stockholm University]
Scalia, Giusy [Seoul National University]
Bergström, Lennart [Stockholm University]
Lagerwall, Jan mailto [Seoul National University]
Chemphyschem : A European Journal of Chemical Physics and Physical Chemistry
Wiley-VCH Verlag Gmbh
Liquid Crystals
Yes (verified by ORBilu)
[en] Cellulose nanocrystals ; Liquid crystals ; Jamming
[en] The intrinsic ability of cellulose nanocrystals (CNCs) to self-organize into films and bulk materials with helical order in a cholesteric liquid crystal is scientifically intriguing and potentially important for the production of renewable multifunctional materials with attractive optical properties. A major obstacle, however, has been the lack of control of helix direction, which results in a defect-rich, mosaic-like domain structure. Herein, a method for guiding the helix during film formation is introduced, which yields dramatically improved uniformity, as confirmed by using polarizing optical and scanning electron microscopy. By raising the CNC concentration in the initial suspension to the fully liquid crystalline range, a vertical helix orientation is promoted, as directed by the macroscopic phase boundaries. Further control of the helix orientation is achieved by subjecting the suspension to a circular shear flow during drying.
Researchers ; Professionals

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