Transition between widened BPs by light irradiation using photo-active bent-core liquid crystal with chiral dopant

Jeong, Hyeon Cheol; Le, Khoa V.; Gim, Min Jun; Hur, Sung Taek; Choi, Suk Won; Araoka, Fumito; Ishikawa, Ken; Takezoe, Hideo

doi:10.1039/c2jm16650j

Cited by 36 publications

(20 citation statements)

References 24 publications

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“…Additionally, the cis-to-trans back-isomerization can be accelerated by exposure to green light. Similar isomerization-induced range expansion had also been discovered [51].…”

Section: Expansion Of Temperature Range Of Bpsmentioning

confidence: 82%

“…In most cases, cubic BPs can simply be recognized by the appearance of colored platelets under polarizing optical microscope (POM) [40], while BPIII, the fog-like phase, shows extremely weak reflection and scattering, which makes its identification relatively hard [51]. Precise phase identification of cubic BPs is often carried out in conjunction with certain supplementary approaches like Kössel diagram and reflection/transmission spectrum.…”

Section: Phase Identification Of Bpmentioning

confidence: 99%

“…The characteristic Kössel pattern of a planar cholesteric, composed of superimposed spiral arcs, is also displayed. Phase sequence of a BPLC could be identified by measuring its physical properties as a function of temperature including refractive index [87], density [88], elasticity [89], viscosity [89], heat capacity [89,90], permittivity [91] and optical rotatory power (optical activity) [51,92]. Quantitative characterization of these properties and their temperature dependency also help develop high-performance BP devices for advanced photonic applications.…”

Section: Phase Identification Of Bpmentioning

confidence: 99%

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Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Lin

Chen

2015

Anisotropic Nanomaterials

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Blue phase liquid crystals (BPLCs) have attracted considerable attention in recent years owing to their unique periodic structure and electro-optic properties. Besides the potential applications in the next generation display, BPLC with a cubic lattice structure can be regarded as a self-organized three-dimenstional (3D) photonic crystal that can be applied for photonic devices such as optical filter, optical attenuator, phase modulator, laser source and so on. This chapter will introduce the formation of BPLCs from both theoretical and experimental points of view. The stability and temperature range of BPLCs are also discussed followed by its photonic crystal structure, lattice orientation and phase identification. After a basic overview, this chapter will further introduce the applications of BPLCs, including controllability of photonic band gap with external fields, fast electro-optic Kerr effect, and optical nonlinear effect. This short summary shows that the century old intriguing BPLCs have diverse opportunities to offer in modern photonic materials and devices. Moreover, the current challenges in this area are expected to spark innovative ideas leading toward the design and engineering of new chiral materials that may furnish suitable BPLCs to produce advanced photonic materials that have desirable properties and functions.

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“…Additionally, the cis-to-trans back-isomerization can be accelerated by exposure to green light. Similar isomerization-induced range expansion had also been discovered [51].…”

Section: Expansion Of Temperature Range Of Bpsmentioning

confidence: 82%

Section: Phase Identification Of Bpmentioning

confidence: 99%

Section: Phase Identification Of Bpmentioning

confidence: 99%

See 1 more Smart Citation

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Lin

Chen

2015

Anisotropic Nanomaterials

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“…Achiral bent-core dopants were also used for BP stabilization as polymers and nanoparticles did [213], and the phase temperature range was greatly widened. Jeong et al [214] reported that UV irradiation of an azo-benzene bent-core LC doped with chiral molecules leads to a photo-induced transition from BPI to BPIII, accompanied by BPIII stabilization of 20 • C. Many papers dealing with BPs and bent-core molecules have been published [215][216][217][218][219]. How to achieve uniform alignment might be still an important issue to consider for bent-core BP viable applications.…”

Section: Othersmentioning

confidence: 99%

Electric‐ and Light‐Responsive Bent‐Core Liquid Crystals: From Molecular Architecture and Supramolecular Nanostructures to Applications

Zhang¹

2013

Intelligent Stimuli‐Responsive Materials

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The three classic states of matter are well known and ubiquitous in everyday life: solid, liquid, and gas. Liquid crystals (LCs), an intermediate state between solid crystal and isotropic liquid, constitute a new fascinating class of condensed soft matter uniquely combining both fluidity and long-range order. The fluid-like mobility enables LCs to be switchable under external stimuli, and crystal-like long-range order bestows anisotropic physical properties on LCs. LCs can be divided into two main classes: thermotropic and lyotropic. Thermotropic LCs consist of individual molecules (or ion pairs) and exhibit phase transitions with the change of temperature. In this case, temperature is the fundamental thermodynamic factor determining mesophase formation. Lyotropic LCs are a special type of solution system that can form mesophases as a function of both temperature and concentration of LC molecules. The building block of a lyotropic phase is an aggregate (called a micelle) formed via self-assembly of many molecules (typically on the order of 100). Examples of LCs can be found both in the natural world and in technological applications. Thermotropic LCs find 189 190 ELECTRIC-AND LIGHT-RESPONSIVE BENT-CORE LIQUID CRYSTALS a wide variety of uses in displays, and an important example of lyotropic LCs is cell membranes formed by amphiphilic lipids. Surfactants in water (i.e., soap water) constitute another useful example of lyotropic LCs. Although the majority of LCs are organic molecules, there exist many LC materials incorporating metals into organic anisotropic molecules [1-3]. These organic-inorganic hybrid LC materials are described as metallomesogens and are recently called metallotropic LCs [4] as distinguished from two main LC classes. In fact, metallomesogens can be classified as either thermotropic or lyotropic LCs depending on their composition and conditions. However, it should be noted that metallomesogens offer a material platform to incorporate magnetic, electronic, optical, redox, and catalytic properties common to inorganic materials into LCs.Although thermotropic LCs have been known to scientists for over 100 years since a discovery by the Austrian botanical physiologist Friedrich Reintizer in 1888, it was only in the late 1960s that they began to be used in display applications. Today, they are best known for their exceptionally successful commercial applications in flat panel display products such as TVs, smart phones, computer displays, and digital projectors. Although today's LC display technology is becoming very advanced, LC materials used in display devices possess the simplest nematic (N) phase and their molecules have been variants on simple rod shapes (Fig. 6.1a). Besides nematic phases, LCs can exhibit other phases: smectic (Sm), columnar (Col), and cubic phases, depending on the orientational or positional orders of their molecules. Nematic phases have only long-range orientational order, smectic mesophases exhibit one-dimensional (1D) positional order and form two-dimensional (2D) layered ...

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“…16 Since then, some other bent shaped molecules containing azobenzene moieties have been synthesized, the majority of these molecules presenting interesting liquid crystalline properties. [16][17][18][19][20][21][22][23][24] The goal of the paper is to extent the classes of bent shaped molecules containing the azo photoisomerisable group. The paper presents the synthesis of some bent-core liquid crystals based on a 1,3-dihydroxy-benzene core with two symmetric wings containing each three benzene rings connected via esteric, azomethinic and azo groups.…”

Section: Introductionmentioning

confidence: 99%

Symmetric Bent-core Liquid Crystals of Some Schiff Bases Containing Azo Linkage

Ciobanu¹,

Carlescu²,

Lisă³

et al. 2014

Croat. Chem. Acta

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Abstract. The paper presents the synthesis and liquid crystalline properties of some new symmetric bentcore liquid crystals containing a 1,3-dihydroxybenzene central core disubstituted with mesogenic units consisting of three aromatic rings connected through esteric, azomethinic and azo groups. The wings are ended with terminal acyloxy or alkyloxy chains containing 6 to 10 carbon atoms. Compounds were obtained by the condensation reactions between some 4-((4-alcanoyloxyphenyl)azo)benzaldehydes or 4-((4-alkyloxyphenyl)azo)benzaldehydes with the 1,3-phenylene bis(4-aminobenzoate) core. The new synthesized compounds were characterized from structural point of view ( 1 H NMR, 13 C NMR, MS spectroscopy) and liquid crystalline properties (polarizing optical microscopy and differential scanning calorimetry). All the banana shaped compounds presented enantiotropic liquid crystalline properties, with a wideranging stability of mesophases both on heating and cooling cycles. The synthesized compounds presented a good thermal stability in the existence range of the mesophases as evidenced by thermogravimetric studies. (doi: 10.5562/cca2150)

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Transition between widened BPs by light irradiation using photo-active bent-core liquid crystal with chiral dopant

Cited by 36 publications

References 24 publications

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Electric‐ and Light‐Responsive Bent‐Core Liquid Crystals: From Molecular Architecture and Supramolecular Nanostructures to Applications

Symmetric Bent-core Liquid Crystals of Some Schiff Bases Containing Azo Linkage

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