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Liquid Crystals Today Volume 28, 2019 - Issue 2
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Research Article

Light responsive liquid crystal soft matters: structures, properties, and applications

Dae-Yoon KimDepartment of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USACorrespondence[email protected]
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Kwang-Un JeongDepartment of Polymer-Nano Science and Technology, Chonbuk National University, Jeonbuk, KoreaView further author information
Pages 34-45 | Published online: 23 Aug 2019

Figures & data

Figure 1. Chemical structures of two isomerised states of azobenzene molecules (a). Absorption spectra changes of azobenzene-based supramolecules upon irradiation of UV (b) and Vis (c) light, respectively. Reproduced with permission [Citation30].

Figure 1. Chemical structures of two isomerised states of azobenzene molecules (a). Absorption spectra changes of azobenzene-based supramolecules upon irradiation of UV (b) and Vis (c) light, respectively. Reproduced with permission [Citation30].

Figure 2. Chemical structure of AZ4Pd with four azobenzene groups connected by an organopalladium bridge (a). Absorption spectra aligned AZ4Pd sample with polariser at 0° and 90° (b). Polar plots of the absorption change by rotating the polarised axis of incident light with UV and Vis light irradiation (c). Reproduced with permission [Citation37].

Figure 2. Chemical structure of AZ4Pd with four azobenzene groups connected by an organopalladium bridge (a). Absorption spectra aligned AZ4Pd sample with polariser at 0° and 90° (b). Polar plots of the absorption change by rotating the polarised axis of incident light with UV and Vis light irradiation (c). Reproduced with permission [Citation37].

Figure 3. Chemical structure of photoresponsive chiral molecule of AZ2BP (a) POM images of the N* phase of the 1.0 wt% AZ2BP doped optical cell at 25°C (b) Reflection spectra upon UV irradiation at 365 nm for 0 s, 5 s, and 10 s, respectively (c). Reproduced with permission [Citation43].

Figure 3. Chemical structure of photoresponsive chiral molecule of AZ2BP (a) POM images of the N* phase of the 1.0 wt% AZ2BP doped optical cell at 25°C (b) Reflection spectra upon UV irradiation at 365 nm for 0 s, 5 s, and 10 s, respectively (c). Reproduced with permission [Citation43].

Figure 4. Chemical structures of amphiphilic supramolecules of AZ1CT (a). POM images and 2D WAXD patterns (inset) of macroscopically oriented sample (b), light-induced isotropic state (c), and the ordered sample with multidomains (d). The 1D WAXD patterns of AZ1CT (e). Reproduced with permission [Citation48].

Figure 4. Chemical structures of amphiphilic supramolecules of AZ1CT (a). POM images and 2D WAXD patterns (inset) of macroscopically oriented sample (b), light-induced isotropic state (c), and the ordered sample with multidomains (d). The 1D WAXD patterns of AZ1CT (e). Reproduced with permission [Citation48].

Figure 5. Schematic illustration of surfactant molecules of AZ1CE and AZ3CE forming expanded and condensed phase on the ITO surfaces (a). 3D topographic height profiles of self-assembled AZ1CE (b) and AZ3CE (c) monolayer film. Reproduced with permission [Citation57].

Figure 5. Schematic illustration of surfactant molecules of AZ1CE and AZ3CE forming expanded and condensed phase on the ITO surfaces (a). 3D topographic height profiles of self-assembled AZ1CE (b) and AZ3CE (c) monolayer film. Reproduced with permission [Citation57].

Figure 6. Fabrication procedure of photorecorders by applying a photomask (a). Transmittance changes of the LC cell filled with 1 wt% photoresponsive macrogelator by alternating UV and Vis light (b). Macroscopic images of the rewritable optical cell and possible mechanisms of LC gel formation and dissociation induced by light and heat (c). Reproduced with permission [Citation61].

Figure 6. Fabrication procedure of photorecorders by applying a photomask (a). Transmittance changes of the LC cell filled with 1 wt% photoresponsive macrogelator by alternating UV and Vis light (b). Macroscopic images of the rewritable optical cell and possible mechanisms of LC gel formation and dissociation induced by light and heat (c). Reproduced with permission [Citation61].

Figure 7. 2D WAXD patterns (a) and POM microphotographs (b) of AZ3NO. Schematic illustrations of molecular packing model and photoreversible bending mechanisms upon irradiating UV and Vis light (c). Reproduced with permission [Citation65].

Figure 7. 2D WAXD patterns (a) and POM microphotographs (b) of AZ3NO. Schematic illustrations of molecular packing model and photoreversible bending mechanisms upon irradiating UV and Vis light (c). Reproduced with permission [Citation65].

Figure 8. Schematic illustrations of photochromic polymer of AZ1LP (a). 2D WAXD pattern of the uniaxially oriented AZ1LP fibre (b). Writing the micropatterns on the AZ1LP film by exposing the UV light through the photomask (c) and erasing them by back isomerisation reaction (d). Reproduced with permission [Citation75].

Figure 8. Schematic illustrations of photochromic polymer of AZ1LP (a). 2D WAXD pattern of the uniaxially oriented AZ1LP fibre (b). Writing the micropatterns on the AZ1LP film by exposing the UV light through the photomask (c) and erasing them by back isomerisation reaction (d). Reproduced with permission [Citation75].

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