Huai Yang's research while affiliated with Fukuoka University and other places
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Publications (9)
(Polymer/liquid crystal: LC) composite films consisting of a continuous LC phase embedded in a three-dimensional network of a polymer matrix show a light scattering-light transmitting switching upon application of an electric field OFF-ON. The electro-optical properties of the composite systems are known to be strongly dependent on the aggregation...
The solubilities of 7,8-dihydroxyflavone and 3,3‘,4‘,5,7-pentahydroxyflavone (quercetin) in supercritical carbon dioxide (SC-CO2) were measured at 308.2 K and 318.2 K over the pressure range from 9.1 MPa to 25.3 MPa by a flow type apparatus. The solubilities were determined from the mass of solute trapped by decompression and the volume of CO2. Sol...
A (polymer network/nematic liquid crystal/chiral dopant) composite exhibiting a chiral nematic (N-*) phase at room temperature has been developed. Because the helical twisting power of the chiral dopant increases with increasing temperature and the polymer network affects the molecular rearrangement of the liquid crystal, the bandwidth of the selec...
A [polymer network/liquid crystals (LCs)/chiral dopant] composite with a smectic A (S-A) <----> chiral nematic (N*) phase transition is prepared. A very drastic change from the light-scattering S-A phase to the transparent N* one is achieved upon heating the composite. The transparent state of the N* phase is 'frozen' in the S-A phase upon cooling....
Blue phases are types of liquid crystal phases that appear in a temperature range between a chiral nematic phase and an isotropic liquid phase. Because blue phases have a three-dimensional cubic structure with lattice periods of several hundred nanometres, they exhibit selective Bragg reflections in the range of visible light corresponding to the c...
A heat-induced drastic switching from a transparent smectic A (SmA) phase to a light-scattering nematic (N*) one was achieved for a (homeotropically oriented polymer network (HOPN)/side chain type liquid crystalline polymer (SCLCP)/liquid crystals (LCs)/chiral dopant) quaternary composite. In the case that the composite was rapidly cooled from the...
A side-chain type ferroelectric liquid crystalline polymer (FLCP) was mixed with a low-molecular-weight ferroelectric liquid crystal (LMWFLC) to improve the light switching contrast for the transient light-scattering mode (TSM). Optical transmittance through an optically homogeneous chiral smectic C phase in a FLCP/LMWFLC composite system was obser...
Thermo-recording in a [side chain type smectic A liquid crystal polymer (SmA-LCP)/nematic liquid crystal (N-LC)/chiral dopant/dichroic dye] composite has been realized by using 2mW of power from a He-Ne laser. The laser irradiation-induced phase transitions of smectic A (SmA) → chiral nematic (N*) → SmA formed the dominant thermo-recording mechanis...
A sharp change in transmittance from a transparent state to a light scattering one within a tiny temperature range is induced accompanied with the heat-induced phase transition from a smectic-A (SA) phase to a chiral nematic (N*) one in a side-chain smectic-A liquid crystalline polymer (SALCP)–low-molecular-weight nematic liquid crystal (NLC)–chira...
Citations
... The concentration of bifunctional chiral monomers near the upper surface is higher, the pitch of molecular arrangement is smaller, and the opposite is true near the lower surface [23]. Yang used chiral compounds whose helical twisting force increases with increasing temperature to prepare polymer-stabilized cholesteric liquid crystal films whose reflective bandwidth broadens with increasing temperature by triggering cross-linking reactions between monomer molecules in a liquid crystalline polymerizable monomer/nematic liquid crystal/chiral compound composite system [24]. In recent years, Yang has prepared chiral azobenzene compounds with photoresponsive properties instead of thermoresponsive chiral compounds and once again succeeded in preparing CLC films that can undergo broadband reflections [25]. ...
... The addition of absorbing dyes to NLCs, even in small concentrations, introduces new orienting mechanisms [6]. Dye doped liquid crystalline systems have indeed been the subject of intense studies in recent decades [10][11][12]. Mixing of carbon nanotubes (CNTs) in LC host is the recent development towards the modification of physical properties of LCs by doping non--mesogenic molecules [13,14]. ...
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... When these methods are applied, the solubility of the LCs in the polymer matrix decreases, causing phase separation and the formation of microphase-separated structures [52][53][54][55][56][57][58] . Electronically controlled LC composites respond only to electric signals; however, thermally controlled composites respond to both electric power and temperature changes within their environment [59][60][61] . ...
... Matsuyama et al. [32] studied the solubility of quercetin in scCO 2 at two temperatures, 308.2 K and 318.2 k, and found an increase in the solubility with pressure. ...
... When these methods are applied, the solubility of the LCs in the polymer matrix decreases, causing phase separation and the formation of microphase-separated structures [52][53][54][55][56][57][58] . Electronically controlled LC composites respond only to electric signals; however, thermally controlled composites respond to both electric power and temperature changes within their environment [59][60][61] . ...
... They may be used to fabricate electrically addressable flexible films, which can be switched, for example, between a transparent and a translucent state [10][11][12][13]. In contrast, LC/polymer composites with interconnected LC regions or liquid crystal films pervaded by a fine network of interconnected fibers [14,15] are referred to as anisotropic gels [15], polymer-stabilized liquid crystals (PSLCs) [16][17][18][19], polymer network liquid crystals (PNLCs) [20,21], or polymer network-stabilized liquid ...
