A Method To Preserve the Chiral Nematic Order of Lyotropic Ethylcellulose and (Acetyl)(ethyl)cellulose Mesophases in Solid Films

1998 ◽  
Vol 10 (6) ◽  
pp. 1720-1726 ◽  
Author(s):  
Shu Shimamoto ◽  
Derek G. Gray
Keyword(s):  
Ethyl Cellulose ◽  
Nematic Order ◽  
Solid Films ◽  
Chiral Nematic

Surface Modification of Nanocrystalline Cellulose toward a Tunable Optical Polarizer

MRS Advances ◽  
2015 ◽  
Vol 1 (10) ◽  
pp. 651-657
Author(s):  
Martin Bolduc ◽  
Michel Poirier ◽  
Gregory Chauve ◽  
Hassane Oulachgar ◽  
Tom Tiwald ◽  
...  
Keyword(s):  
Helical Structure ◽  
Nanocrystalline Cellulose ◽  
The Self ◽  
Polarization Effects ◽  
Nematic Order ◽  
Optical Wavelength ◽  
Solid Films ◽  
Chiral Nematic ◽  
Optical Polarizer ◽  
Self Assembled

ABSTRACTNanocrystalline cellulose (NCC) solid films obtained from evaporated aqueous heterogeneous mixtures retain the self-assembled chiral nematic order formed in the suspension. These semi-translucent films are iridescent and reflect or transmit circularly polarized visible light (400-700nm) due to the chiral properties of the self-assembled nanostructure. This effect occurs at different wavelengths depending on the pitch of the helical structure. In this paper, NCC films have been fabricated from different recipes to produce various helix pitches. The corresponding red-shift in the optical wavelength has been obtained by means of Spectrophotometry measurements. Preliminary experiments have been performed to investigate optical polarization effects as function of angles of incidence using ellipsometry. Finally, laser micromachining results on NCC films may suggest feasibility for integration as tunable light polarizer components.

scholarly journals Unexpected microphase transitions in flow towards nematic order of cellulose nanocrystals

Cellulose ◽  
2019 ◽  
Vol 27 (4) ◽  
pp. 2003-2014 ◽  
Author(s):  
Roland Kádár ◽  
Mina Fazilati ◽  
Tiina Nypelö
Keyword(s):  
Liquid Crystal ◽  
Shear Rate ◽  
Formation Process ◽  
Recovery Time ◽  
Continuous Process ◽  
Cellulose Nanocrystal ◽  
Nematic Order ◽  
Chiral Nematic ◽  
Macro Scale

Abstract Organization of nanoparticles is essential in order to control their light-matter interactions. We present cellulose nanocrystal suspension organization in flow towards a unidirectional state. Visualization of evolving polarization patterns of the cellulose nanocrystal suspensions is combined with steady and oscillatory shear rheology. Elucidation of the chiral nematic mesophase in a continuous process towards unidirectional order enables control of alignment in a suspension precursor for structural films and reveals thus far in situ unrevealed transition states that were not detectable by rheology alone. The coupled analytics enabled the suspensions of interest to be divided into rheological gels and rheological liquid crystal fluids with detailed information on the microtransition phases. Both populations experienced submicron organization and reached macro-scale homogeneity with unidirectional ordering in continued shear. We quantify the time, shear rate, and recovery time after shear to design an optimizing formation process for controlled wet structures as precursors for dry products. Graphic abstract

Chiral nematic order in liquid crystals imposed by an engineered inorganic nanostructure

Nature ◽  
10.1038/21612 ◽  
1999 ◽  
Vol 399 (6738) ◽  
pp. 764-766 ◽  
Author(s):  
K. Robbie ◽  
D. J. Broer ◽  
M. J. Brett
Keyword(s):  
Liquid Crystals ◽  
Nematic Order ◽  
Chiral Nematic

Photonic metal–polymer resin nanocomposites with chiral nematic order

2016 ◽  
Vol 52 (50) ◽  
pp. 7810-7813 ◽  
Author(s):  
Vitor M. Zamarion ◽  
Mostofa K. Khan ◽  
Maik Schlesinger ◽  
Anas Bsoul ◽  
Konrad Walus ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Cellulose Nanocrystals ◽  
Nematic Order ◽  
Polymer Resin ◽  
Chiral Nematic ◽  
Ink Jet ◽  
Metal Polymer

Metal nanoparticles that spontaneously nucleate in the chiral channels of a polymer resin templated by cellulose nanocrystals form ink-jet printed images.

Handedness Inversion in Chiral Nematic (Ethyl)cellulose Solutions: Effects of Substituents and Temperature

2021 ◽  
Author(s):  
Yoshiyuki Nishio ◽  
Takayuki Nada ◽  
Takuma Hirata ◽  
Shinpei Fujita ◽  
Kazuki Sugimura ◽  
...  
Keyword(s):  
Ethyl Cellulose ◽  
Chiral Nematic
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