Effect of polymer backbone flexibility on blue phase liquid crystal stabilization

Kizhakidathazhath, Rijeesh; Higuchi, Hiroki; Okumura, Yasushi; Kikuchi, Hirotsugu

doi:10.1016/j.molliq.2018.04.085

Cited by 9 publications

(6 citation statements)

References 41 publications

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“…This provides further evidence of the weak anchoring nature of A3DA. We have recently reported that the switching voltages could be reduced for blue phase liquid crystals stabilized with A3DA because of the decrease in the interface anchoring strength [49]. Taking into consideration all of the data mentioned above, it is reasonable to consider that the driving voltage reduction in PDLC prepared with A3DA and HDDA probably resulted from the reduction of anchoring energy between polymer networks and LCs enabled by the uniquely designed A3DA monomer.…”

Section: Resultsmentioning

confidence: 99%

High-Performance Polymer Dispersed Liquid Crystal Enabled by Uniquely Designed Acrylate Monomer

et al. 2020

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The widespread electro–optical applications of polymer dispersed liquid crystals (PDLCs) are hampered by their high-driving voltage. Attempts to fabricate PDLC devices with low driving voltage sacrifice other desirable features of PDLCs. There is thus a clear need to develop a method to reduce the driving voltage without diminishing other revolutionary features of PDLCs. Herein, we report a low-voltage driven PDLC system achieved through an elegantly simple and uniquely designed acrylate monomer (A3DA) featuring a benzene moiety with a dodecyl terminal chain. The PDLC films were fabricated by the photopolymerization of mono- and di-functional acrylate monomers (19.2 wt%) mixed in a nematic liquid crystal E7 (80 wt%). The PDLC film with A3DA exhibited an abrupt decline of driving voltage by 75% (0.55 V/μm) with a high contrast ratio (16.82) while maintaining other electro–optical properties almost the same as the reference cell. The response time was adjusted to satisfactory by tuning the monomer concentration while maintaining the voltage significantly low (3 ms for a voltage of 0.98 V/μm). Confocal laser scanning microscopy confirmed the polyhedral foam texture morphology with an average mesh size of approximately 2.6 μm, which is less in comparison with the mesh size of reference PDLC (3.4 μm), yet the A3DA-PDLC showed low switching voltage. Thus, the promoted electro–optical properties are believed to be originated from the unique polymer networks formed by A3DA and its weak anchoring behavior on LCs. The present system with such a huge reduction in driving voltage and enhanced electro–optical performance opens up an excellent way for abundant perspective applications of PDLCs.

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Section: Resultsmentioning

confidence: 99%

High-Performance Polymer Dispersed Liquid Crystal Enabled by Uniquely Designed Acrylate Monomer

et al. 2020

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“…Many researchers have utilized this approach and explored the impact of various factors, such as polymer chain solubility, composition, rigidity, and the degree of cross-link density in the BP bulk. [96][97][98][99][100] Following this strategy, Castles et al created free standing, 3D casting templates with lightly crosslinked polymer networks. 96 Using a 3-5 wt% chiral dopant, 25-50 wt% reactive mesogens/photo initiator mixture dissolved in bimesogenic LC, they were able to fabricate a free-standing template which was then washed of liquid crystalline material.…”

Section: Stabilization Of Disclination Networkmentioning

confidence: 99%

Photonic features of blue phase liquid crystals under curved confinement

Money,

Munguia-Fernández,

Norouzi

et al. 2023

Chem. Commun.

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“…During the polymerization process, the monomers added to the BP mixture are pushed out to the topological disclination lines of the BP cubic structure. Essentially, monomers polymerizing within the disclination lines function, in fact, as a scaffold supporting the whole structure [82].…”

Section: Thermal Stabilizationmentioning

confidence: 99%

Optimizing Tunable LC Devices with Twisted Light

Otón,

Pereiro-García,

Quintana

et al. 2023

Crystals

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Tunable circular devices made of liquid crystals or other materials, like lenses, axicons, or phase plates, are often constrained by limitations in size, tunability, power, and other parameters. These constraints restrict their use and limit their applicability. In this review, a thorough study of the use of light’s orbital angular momentum in the manufacturing of liquid crystal (LC) devices is presented. Twisted light fosters the simultaneous optimization of most critical parameters. Experimental demonstrations of the unmatched performance of tunable LC lenses, axicons, and other elements in parameters such as lens diameter (>1″), power and tunability (>±6 diopters), fill factor (>98%), and time response have been achieved by reversible vortex generation created by azimuthal phase delay. This phase delay can eventually be removed within the optical system so that lens performance is not affected.

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Effect of polymer backbone flexibility on blue phase liquid crystal stabilization

Cited by 9 publications

References 41 publications

High-Performance Polymer Dispersed Liquid Crystal Enabled by Uniquely Designed Acrylate Monomer

High-Performance Polymer Dispersed Liquid Crystal Enabled by Uniquely Designed Acrylate Monomer

Photonic features of blue phase liquid crystals under curved confinement

Optimizing Tunable LC Devices with Twisted Light

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