scholarly journals Modification of the twist angle in chiral nematic polymer films by photoisomerization of the chiral dopant

1999 ◽  
Vol 85 (11) ◽  
pp. 7517-7521 ◽  
Author(s):  
Peter van de Witte ◽  
Edda E. Neuteboom ◽  
Martin Brehmer ◽  
Johan Lub
Keyword(s):  
Polymer Films ◽  
Twist Angle ◽  
Chiral Nematic ◽  
Nematic Polymer

scholarly journals Characterization of Orientation Correlation Kinetics: Chiral-mesophase Domains in Suspensions Charged DNA-rods

2021 ◽  
Author(s):  
Kyongok Kang
Keyword(s):  
Twist Angle ◽  
Equilibrium Phase ◽  
Time Correlation ◽  
Real Space ◽  
Correlation Technique ◽  
Chiral Nematic ◽  
Kinetics Of ◽  
Microscopy Images ◽  
Kinetic Features

Abstract Bacteriophage DNA fd-rods are long and stiff rod-like particles which are known to exhibit a rich equilibrium phase behavior. Due to their helical molecular structure, they form the stable chiral nematic (N*) mesophases. Very little is known about the kinetics of forming various phases with orientations. The present study addresses the kinetics of chiral-mesophases and N*-phase, by using a novel image-time correlation technique. Instead of correlating time-lapsed real-space microscopy images, the corresponding Fourier images are shown for time-correlated averaged orientations. This allows to unambiguously distinguish to detect the temporal evolution of orientations on different length scales, such as domain sizes (depending on their relative orientations), and the chiral pitch within the domains. Kinetic features are qualitatively interpreted in terms of replica symmetry breaking of elastic deformations in the orthogonal directional axes of chiral-mesophase domains, as well by the average twist angle and the order parameter. This work can be interesting for characterizing other types of charged rods, mimicking super-cooled liquids and orientation glasses.

Light-Induced Formation of Dynamic and Permanent Surface Topologies in Chiral–Nematic Polymer Networks

2012 ◽  
Vol 45 (19) ◽  
pp. 8005-8012 ◽  
Author(s):  
Danqing Liu ◽  
Cees W. M. Bastiaansen ◽  
Jaap M. J. den Toonder ◽  
Dirk J. Broer
Keyword(s):  
Polymer Networks ◽  
Chiral Nematic ◽  
Nematic Polymer

scholarly journals Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mikhail N. Krakhalev
Keyword(s):  
Boundary Conditions ◽  
Phase Difference ◽  
Tilt Angle ◽  
Twist Angle ◽  
Azimuthal Angle ◽  
Topological Defects ◽  
Polarization Microscopy ◽  
Chiral Nematic ◽  
Microscopy Method

AbstractA polarization microscopy method to investigate the orientational structures and boojums formed in the chiral and achiral nematic layers under conical (tilted) boundary conditions has been developed. Oblique light incidence on nematic layer is used, due to which the phase difference between the ordinary and extraordinary waves depends on the director’s azimuthal angle. The phase difference gets maximal when the director azimuthal angle of achiral nematic $$\varphi (x,y) = 0$$ φ ( x , y ) = 0 and an azimuthal angle at the center of the chiral nematic layer $$\varphi _0(x,y) = 0$$ φ 0 ( x , y ) = 0 independently of the total twist angle $$\varphi _{TOTAL}$$ φ TOTAL . It has been found that the $$m=+1$$ m = + 1 boojums with the phase $$\xi = \pm 90^\circ$$ ξ = ± 90 ∘ and $$\xi = (-90^\circ + \varphi _{TOTAL}/2)$$ ξ = ( - 90 ∘ + φ TOTAL / 2 ) are formed in achiral and chiral nematics, respectively, at the director tilt angle $$\theta _{d/2} \cong 40^\circ$$ θ d / 2 ≅ 40 ∘ at the interface. In addition, the defectless structure of chiral nematic with the periodically variable azimuthal director angle on the substrates has been studied.

scholarly journals Sensors: A Printable Optical Time-Temperature Integrator Based on Shape Memory in a Chiral Nematic Polymer Network (Adv. Funct. Mater. 21/2013)

2013 ◽  
Vol 23 (21) ◽  
pp. 2665-2665 ◽  
Author(s):  
Dylan J. D. Davies ◽  
Antonio R. Vaccaro ◽  
Stephen M. Morris ◽  
Nicole Herzer ◽  
Albertus P. H. J. Schenning ◽  
...  
Keyword(s):  
Shape Memory ◽  
Polymer Network ◽  
Chiral Nematic ◽  
Optical Time ◽  
Nematic Polymer ◽  
Time Temperature Integrator

scholarly journals Photonic Shape Memory Chiral Nematic Polymer Coatings with Changing Surface Topography and Color

2019 ◽  
Vol 7 (19) ◽  
pp. 1900592 ◽  
Author(s):  
Koen Nickmans ◽  
Danielle A. C. der Heijden ◽  
Albert P. H. J. Schenning
Keyword(s):  
Shape Memory ◽  
Surface Topography ◽  
Polymer Coatings ◽  
Chiral Nematic ◽  
Nematic Polymer
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