Magnetically tunable selective reflection of light by heliconical cholesterics

Salili, Seyyed Muhammad; Xiang, Jie; Wang, Hao; Li, Q.; Paterson, Daniel A.; Storey, John M. D.; Imrie, Corrie T.; Lavrentovich, Oleg D.; Sprunt, Samuel; Gleeson, J. T.; Jákli, Antal

doi:10.1103/physreve.94.042705

Cited by 77 publications

(31 citation statements)

References 34 publications

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“…However, odd flexible dimers such as CB7CB and its mixtures with other dimers and 5CB do satisfy the requirement 33 22 K K < and thus produce the Ch OH state when acted upon by the electric (J. Xiang et al 2014Xiang et al , 2015 or magnetic (Salili, Xiang, et al 2016) fields. Its pitch is tunable by the electric field applied…”

Section: Ivb Chiral Nematic Phasementioning

confidence: 99%

Physics of liquid crystals of bent-shaped molecules

2018

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Thermotropic liquid crystals can be formed by various molecular shapes, some discovered over 125 years ago. The simplest and most-studied liquid crystals are made of rodshaped molecules and led to today's omnipresent LCDs. While applied scientists and engineers have been perfecting LCDs, a large group of liquid crystal scientists have become excited about liquid crystals of bent-shaped (banana-shaped) molecules. These compounds were first reported 20 years ago, and since then have taken center stage in current liquid crystal science. The "banana-mania" is due to the fact that even a small kink in the molecular shape leads to fundamentally new properties and phases. In this review we summarize the large variety of novel structures and physical properties, and describe the underlying physics. We emphasize that macroscopic properties depend on both the shape of the molecules and the flexibility of the central core. Most rigid bent-core molecules form smectic and sometimes columnar structures; only a minority forms nematic phases. By contrast, most flexible bent-core molecules form nanostructured nematic phases, including the twist-bend nematic phase discovered very recently.

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Section: Ivb Chiral Nematic Phasementioning

confidence: 99%

Physics of liquid crystals of bent-shaped molecules

2018

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“…Similar to electric field, recently magnetic field has been found to induce heliconical cholesteric phase and by appropriately choosing the field strength it is possible to maintain the helical axis orientation parallel to the magnetic field . Moreover, magnetic‐field‐driven reflection color tuning has been demonstrated in an induced heliconical CLC mixture.…”

Section: Control Of the Helical Axis In Heliconical Clcsmentioning

confidence: 98%

Section: Control Of the Helical Axis In Heliconical Clcsmentioning

confidence: 99%

Stimuli‐Driven Control of the Helical Axis of Self‐Organized Soft Helical Superstructures

2018

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Supramolecular and macromolecular functional helical superstructures are ubiquitous in nature and display an impressive catalog of intriguing and elegant properties and performances. In materials science, self-organized soft helical superstructures, i.e., cholesteric liquid crystals (CLCs), serve as model systems toward the understanding of morphology- and orientation-dependent properties of supramolecular dynamic helical architectures and their potential for technological applications. Moreover, most of the fascinating device applications of CLCs are primarily determined by different orientations of the helical axis. Here, the control of the helical axis orientation of CLCs and its dynamic switching in two and three dimensions using different external stimuli are summarized. Electric-field-, magnetic-field-, and light-irradiation-driven orientation control and reorientation of the helical axis of CLCs are described and highlighted. Different techniques and strategies developed to achieve a uniform lying helix structure are explored. Helical axis control in recently developed heliconical cholesteric systems is examined. The control of the helical axis orientation in spherical geometries such as microdroplets and microshells fabricated from these enticing photonic fluids is also explored. Future challenges and opportunities in this exciting area involving anisotropic chiral liquids are then discussed.

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“…LCs serve as model supramolecular systems. They have been regarded as an important class of soft materials owing to their large response to small stimuli . Moreover, they play very critical roles in living systems.…”

Section: Liquid Crystals Driven By Photothermal Effectmentioning

confidence: 99%

Soft Materials Driven by Photothermal Effect and Their Applications

Bisoyi

Urbas

2018

Advanced Optical Materials

128

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Remote driving of functional hybrid soft materials for various applications is emerging as an enabling pursuit. Toward this end, soft materials driven by photothermal agents have been attracting tremendous attention from both fundamental science and technological applications points of view. These stimuli‐responsive materials combine the beneficial attributes of both classes of promising materials, i.e., soft materials and photothermal agents. Both inorganic and organic photothermal agents have been incorporated into the matrices of soft materials. Metal nanoparticles, carbon nanomaterials, and organic photothermal agents have been impregnated into the matrices of liquid crystals, polymers, and gels that can be remotely driven by light irradiation. In this review, the remote driving of functional hybrid soft materials and their various applications are discussed. Photothermal functional nanocomposites are demonstrated to act as actuators, therapeutic agents, drug delivery systems, microvalves, etc. Smart and adaptive systems are realized by dispersing photothermal agents into soft matter matrices. Challenges and opportunities in this fascinating frontier are outlined.

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Magnetically tunable selective reflection of light by heliconical cholesterics

Cited by 77 publications

References 34 publications

Physics of liquid crystals of bent-shaped molecules

Physics of liquid crystals of bent-shaped molecules

Stimuli‐Driven Control of the Helical Axis of Self‐Organized Soft Helical Superstructures

Soft Materials Driven by Photothermal Effect and Their Applications

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