Chinese Journal of Liquid Crystals and Displays, Volume. 39, Issue 3, 349(2024)

Dynamic regulation and application of cholesteric liquid crystal patterns

Yuanyuan SHANG1, Jingxia WANG2、*, and Lei JIANG2
Author Affiliations
  • 1College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang 438000, China
  • 2Key Laboratory of Bio-inspired Materials and Interfaces Sciences, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • show less
    Figures & Tables(16)
    Functional groups for light responsive CLC. Molecular structure and photoisomerization process of(a) azobenzene, (b) dithienylethene, (c) alkene molecular motor and (d) α-cyanostilbene.
    (a) Cell images of a 5 μm thick planar cell upon 365 nm UV irradiation for different times; (b) POM images of lying CLC helix in a 15 μm planar cell under 2.2 V AC electric field; (c) Cell images of the CLC in a planar cell irradiated with 530 nm light and 450 nm for different periods of time.
    (a) Illustration of reversible, light-induced, three-dimensional control over the direction of the helical axis; (b) Images of circularly polarized fluorescent pattern realized by the double-layer circularly polarized light system.
    (a) Structural changes of molecular motors induced by light and the color changes of liquid crystals doped with molecular motors; (b) Change of CLC patterns under natural light, under left- and right-circular polarized light; (c1) Structure of the motor; (c2) Molecular motor embedded in the LC film induces the rotation of the glass rod placed on the LC film during irradiation with ultraviolet (UV) light.
    (a) Real cell images in the reflective mode and the corresponding fluorescent mode; (b) Real cell images of dual-mode transparent LC device in front of some toys under ambient white light and blue light-emitting diode backlight; (c) Real photographs of the reflection color and the fluorescence of the mixture at different states.
    POM images of CLC particles (a0) with an initial diameter of 106.45 μm in (a1) (14) aniline, (15) Quin., and (16) Py, (a2) (11) XY, (12) Ace, (13) THF, and (a3) (1) MeOH, (2) hexane, (3) n-dodecane, (4) EA, (5) CYH, (6) NPA, (7) IPA, (8) NBA, (9) SBA, and (10) IBA in the reflection mode between crossed linear polarizers.
    Colorful brush colors of CLC particles in diverse solvents. (a) Vivid peripheral brush colors of CLC particles: blue in (a1) ((1) MeOH, (2) hexane, (3) ndodecane, (4) EA, and (8) NBA), yellow in (a2) ((14) aniline), burgundy in (a3) ((5) CYH, (6) NPA, (7) IPA, (9) SBA, (10) IBA, (11) XY, and (12) Ace.), orange in (a4) ((13) THF and (16) Py), and red in (a5) ((15) Quin.); (b) Schematic of brush color observed at a distance of 38 μm from the center of CLC particles.
    (a) Reflection-mode images of CLCsolid droplets in several solvents having different solubility parameters; (b) Degree of swelling of the CLCsolid shells in solvents as functions of the solubility parameter of the solvent; (c) Reflected light optical microscopy images of the CLCsolid shells in pyridine/water mixtures.
    (a) Photos of repeatable writing/erasing process of different patterns; Sequential photographs showing the distinct multicolor apple patterns through (b1) 365 nm-light irradiation writing, subsequent temperature tuning during heating between 30 ℃ and 52 ℃ (b2).
    (a) Image colors of both the pattern (exposed region) and the background (non-exposed region) blueshift when reducing the temperature from 52 ℃ to 25 ℃; (b) Electricity erasure, electricity removal and pressure visualization of photonic image with blue background and red apple pattern.
    Photographs showing the “write-erase” cycles of each single color (vertical direction) and the “tune-write-erase” mode of different photostationary colors (horizontal direction). The patterns are erased by electric field (dashed gray arrows), tuned by light of different wavelengths (colorful arrows), and written by pressure (black arrows). The cyan, turquoise, green, orange, and red colors are tuned by 530, 470, 445, 365, 405 nm light, respectively.
    (a) Encryption and decryption of an enhanced-security-level geminate label created by eight kinds of CLC micro-droplets in a pixelated array; (b) By modulating the excitation and output mode, different information at 472 nm and 545 nm can be recorded.
    (a1) Schematic illustration of the pattern-reflectance dependency upon the viewing angle limited by Bragg’s law; Emergence and hiding color-tunability, reversibility and digital extraction of the sample viewing at the Bragg angle (a2) and at the viewing angle deviated from Bragg’s law (a3); (b) Schematic illustration of the pattern printing process.
    (a) Photographs of ionic conductive CLCE at different bending angles of the prosthetic finger; (b) Mechanochromic recorder based on polymer-dispersed CLC for texture detection.
    (a) A palm grasps and transfers an object to the destination; (b) Photographs of the 3D shaped cuttlefish made from CLC elastomer; (c) Real images of reversible wing vibrations observed from side view and top view; (d) Camouflage of the octopus on a black rock.
    (a) Relative color change and photographs of the flexible sensors attached on a human body upon sweat exposure and bending motion; (b) Schematics and the optical images of the E-skins attached to human fingers.
    Tools

    Get Citation

    Copy Citation Text

    Yuanyuan SHANG, Jingxia WANG, Lei JIANG. Dynamic regulation and application of cholesteric liquid crystal patterns[J]. Chinese Journal of Liquid Crystals and Displays, 2024, 39(3): 349

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category: Research Articles

    Received: Jan. 2, 2024

    Accepted: --

    Published Online: Apr. 29, 2024

    The Author Email: Jingxia WANG (jingxiawang@mail.ipc.ac.cn)

    DOI:10.37188/CJLCD.2024-0001

    Topics