Laterally dibenzyloxy-branched nematogens with large nematic range and rich solid polymorphism

Canlet, Cécile; Fung, B. M.; Roussel, Frédérick; Leblanc, K.; Berdagué, Philippe; Bayle, J. P.

doi:10.1080/026782900202480

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…In recent years, considerable efforts have been made in the synthesis and characterization of liquid crystals and their mixtures with a wide nematic range [1][2][3][4][5][6][7]. The unique properties, such as lower viscosity, increased temperature range, larger birefringence and dielectric anisotropy, of lowmolecular weight nematic compounds segregate them from other liquid crystals.…”

Section: Introductionmentioning

confidence: 99%

Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures

George¹,

Vallabhan²,

Nampoori³

et al. 2000

J. Phys. D: Appl. Phys.

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Abstract. We report on a laser induced photoacoustic study of the nematic-to-isotropic transition in certain commercial nematic liquid crystal mixtures, namely BL001, BL002, BL032 and BL035. A simple analysis of the experimental data using the Rosencwaig-Gersho theory shows that the heat capacities of all these compounds exhibit a sharp peak as the temperature of the sample is varied across the transition region. Also, substantial differences in the photoacoustic signal amplitudes in nematic and isotropic phases have been noticed for all the mixtures. The increased light scattering property of the nematic phase may be the reason for the enhanced photoacoustic signal amplitude in this phase.

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Section: Introductionmentioning

confidence: 99%

Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures

George¹,

Vallabhan²,

Nampoori³

et al. 2000

J. Phys. D: Appl. Phys.

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Laterally Alkyl‐ and Aryl‐Substituted, Swallow‐Tailed, and Polycatenar Mesogens: Structural Features and Functionalities

Weißflog

2014

Handbook of Liquid Crystals

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Long‐chain groups additionally attached to calamitic mesogens change the shape of the molecules and, therefore, their attractive and repulsive interactions. While compounds bearing lateral alkyl groups mostly exhibit nematic phases, lateral substitution with aryl‐containing groups means a qualitative jump by special packing in layer structures. Polycatenar mesogens can be wedge or dumbbell shaped depending on the number and positions of hydrocarbon chains at one or both terminal positions. Phasmidic and double‐swallow‐tailed mesogens are not able to exhibit smectic A phases for steric reasons, which can be induced, however, in mixtures with small rodlike molecules. Lateral alkyl chains attached to bent‐core mesogens reduce the tendency to form polar switchable layer phases, whereas polycatenar bent molecules form columnar structures. Equipping the molecules under discussion with functional groups in any ω‐standing position allows the lateral or terminal connection of mesogens, for example, to dendrimers, polymers, or metallic surfaces such as gold. In general, increasing the number of aliphatic chains often decreases melting points, increases solubility, and, therefore, allows better processability of functional materials.

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Nematogens incorporating a lateral flexible ring

et al. 2001

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Laterally dibenzyloxy-branched nematogens with large nematic range and rich solid polymorphism

Cited by 4 publications

References 13 publications

Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures

Use of photoacoustic effect for the detection of phase transitions in liquid crystal mixtures

Laterally Alkyl‐ and Aryl‐Substituted, Swallow‐Tailed, and Polycatenar Mesogens: Structural Features and Functionalities

Nematogens incorporating a lateral flexible ring

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