Calorimetric and optical microscopic studies on one ferroelectric liquid-crystal compound with the smectic-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mo>/</mml:mo><mml:mi>e</mml:mi><mml:mi>m</mml:mi><mml:mi>p</mml:mi><mml:mi>h</mml:mi><mml:mo>&gt;</mml:mo><mml:mn /></mml:mrow></mml:msup></mml:mrow></mml:math>phase

Huang, C. C.; Lin, Deng-Sung; Goodby, John W.; Waugh, M. A.; Stein, Sebastian; Chin, E.

doi:10.1103/physreva.40.4153

Cited by 26 publications

(7 citation statements)

References 8 publications

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“…The verification of the existence of TGBs in pure LC compounds and LC mixtures came out in a sequence of experimental studies by Goodby et al [41], Lavrentovich et al [42], and Nguyen et al [43]. The thermal signature, the structure, and the optical textures of the TGB A phase have been clearly identified [44][45][46][47][48]. TGB A consists of slabs of SmA-type of order separated by one-dimensional lattices of screw dislocations along grain boundaries, as depicted in Figure 1.…”

Section: Twist-grain Boundary Phasesmentioning

confidence: 95%

Experimental Advances in Nanoparticle-Driven Stabilization of Liquid-Crystalline Blue Phases and Twist-Grain Boundary Phases

et al. 2021

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Recent advances in experimental studies of nanoparticle-driven stabilization of chiral liquid-crystalline phases are highlighted. The stabilization is achieved via the nanoparticles’ assembly in the defect lattices of the soft liquid-crystalline hosts. This is of significant importance for understanding the interactions of nanoparticles with topological defects and for envisioned technological applications. We demonstrate that blue phases are stabilized and twist-grain boundary phases are induced by dispersing surface-functionalized CdSSe quantum dots, spherical Au nanoparticles, as well as MoS2 nanoplatelets and reduced-graphene oxide nanosheets in chiral liquid crystals. Phase diagrams are shown based on calorimetric and optical measurements. Our findings related to the role of the nanoparticle core composition, size, shape, and surface coating on the stabilization effect are presented, followed by an overview of and comparison with other related studies in the literature. Moreover, the key points of the underlying mechanisms are summarized and prospects in the field are briefly discussed.

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Section: Twist-grain Boundary Phasesmentioning

confidence: 95%

Experimental Advances in Nanoparticle-Driven Stabilization of Liquid-Crystalline Blue Phases and Twist-Grain Boundary Phases

et al. 2021

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“…150 studied the chiral and racemic versions of a chiral compound that exhibits an unusual new phase, which they called the smectic A", in the pure chiral compound. The new phase in this compound seems to be a physical realization of the smectic A twist-grain-boundary (TGB A ) phase theoretically proposed by Renn and Lubensky 50 (see Sec.…”

Section: Smectic Tgba-smectic C Transitionmentioning

confidence: 99%

Thermal Investigations of Phase Transitions in Thermotropic Liquid Crystals

Thoen

1996

Liquid Crystals in the Nineties and Beyond

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Liquid Crystals in the Nineties and Beyond Downloaded from www.worldscientific.com by UNIVERSITY OF BIRMINGHAM LIBRARY -INFORMATION SERVICES on 03/19/15. For personal use only. 20 J. Tkoentransitions is discussed in Sec. 11. In order to avoid long chemical names, commonly used abbreviations listed in the Appendix are utilized in the text. Experimental Methods Purpose of thermal measurementsIn calorimetric experiments, one obtains information on the temperature dependence of the energy or enthalpy H(T) of a given sample. In many cases, one measures the heat capacity C p = (dH/dT) p and is satisfied with only the slope of the enthalpy curve (see Figs. 1 and 2) as a function of temperature. For second-order phase transitions, the information on the pre-transitional heat capacity is needed to analyze the relevant thermal aspects of critical fluctuations. For a first-order phase transition, the essential information on the latent heat A/ft, (see Figs. 1 and 2) cannot be obtained through heat capacity measurements and a direct measurement of the enthalpy is necessary. Fig, 1. (a) Schematic representation of the temperature dependence of the enthalpy H of a liquid crystal sample near a first-order (solid curve) or second-order (dashed curve) phase transition at 7V The dashed-dotted line gives the enthalpy of a (DSC) reference material with a nearly constant heat capacity and without a phase transition, (b) Corresponding DSC responses (from heating runs) for the first-order (solid curve) and second-order (dashed curve) cases of part (a)

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“…Ref. [3][4][5][6][7][8][9]. Recently, the twist grain boundary smectic C phase (TGB-C) was also ~bserved.~ In all known cases the thermal stability of TGB phases is quite small -the temperature range of existence rarely exceeds 1 K. The theory of Renn and Lubensky" predicts that the TGB-A phase should always appear if the molecular chirality is introduced near the NAC multicritical point in the phase diagram (i.e., where the nematic, smectic A and smectic C phases meet).…”

Section: Introductionmentioning

confidence: 99%