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Macroscopic Control...
Macroscopic Control of Helix Orientation in Films Dried from Cholesteric Liquid-Crystalline Cellulose Nanocrystal Suspensions
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Park, Ji Hyun (author)
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Noh, JungHyun (author)
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- Schütz, Christina (author)
- KTH,Stockholms universitet,Institutionen för material- och miljökemi (MMK),Royal Institute of Technology, Sweden,Wallenberg Wood Science Center
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- Salazar Alvarez, German (author)
- KTH,Stockholms universitet,Institutionen för material- och miljökemi (MMK),Royal Institute of Technology, Sweden,Wallenberg Wood Science Center
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Scalia, Giusy (author)
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- Bergström, Lennart (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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Lagerwall, Jan P. F. (author)
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(creator_code:org_t)
- 2014-03-26
- 2014
- English.
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In: ChemPhysChem. - : Wiley. - 1439-4235 .- 1439-7641. ; 15:7, s. 1477-1484
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Keyword
- film growth
- helical structures
- liquid crystals
- nanocrystalline cellulose
- optical properties
- Materials Chemistry
- materialkemi
Publication and Content Type
- ref (subject category)
- art (subject category)
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