Volume and polarisability anisotropy of hexoxy and heptoxy cyanobiphenyl liquid crystals and the eutectic mixture of E607

Ghanadzadeh, A.; Ghanadzadeh, H.; Khoshroo, N.

doi:10.1016/s0167-7322(01)00240-9

Cited by 15 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This response corresponds to the phase transition and the following phase recovery of the host LCs. The phase transition was confirmed from the agreement between the values of Δn e ≃0.1 calculated from the maximum diffraction efficiency, which in turn was obtained from the signal intensity in the saturated region, and the literature values of the refractive-index difference between the nematic and isotropic phases 35 36 . It was further confirmed by the fact that a minuscule change in the refractive index was observed once the initial temperature was set above T NI because no phase change occurred under pump-light irradiation.…”

Section: Resultssupporting

confidence: 68%

Direct measurement of the propagation of the phase-transition region of liquid crystals

Sato

Katayama

2017

Sci Rep

View full text Add to dashboard Cite

Many types of active matter, such as biological cells, have liquid-crystalline membranes, which are soft and flexible in their interactions with their surroundings and sometimes allow molecular-structural or -orientational changes to extend for long distances, owing to long-range molecular interactions. Despite the technological and fundamental importance of these long-range changes, there is no good physical property with which to express them for the liquid crystal. Here, we show direct measurements of the propagation of structural or orientational changes due to long-range molecular interactions in liquid crystals. We induced a patterned phase transition in a liquid crystal via illumination with a fringe pattern and observed the propagation of the phase-transition region. We determined that the propagation occurred in a ballistic manner with a velocity of 80–110 m/s and that two types of propagation—side-by-side and head-to-tail molecular interactions—were found.

show abstract

Section: Resultssupporting

confidence: 68%

Direct measurement of the propagation of the phase-transition region of liquid crystals

Sato

Katayama

2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…This study has been carried out on the basis of specific heat, molar volume, and static dielectric permittivity as a function of temperature around the transition, in a manner similar to that already made for other compounds of the n OCB series. , It is important to realize that, as far as we know, no specific heat data around the N-to-I transition of the 6OCB have been reported up to date. As for molar volume data, only very few values for N and I phases were reported in the literature, as it has been already evidenced in a previous work by us . Molar volume data of 6OCB published in our previous work, completed with new values, will be used in the current study to obtain information about the N-to-I critical behavior.…”

Section: Introductionmentioning

confidence: 96%

Study of the Critical Behavior and Scaling Relationships at the N-to-I Phase Transition in Hexyloxycyanobiphenyl

Salud

Cusmin²,

Fuente³

et al. 2009

J. Phys. Chem. B

View full text Add to dashboard Cite

An exhaustive analysis of the critical behavior of the nematic to isotropic (N-to-I) phase transition on the liquid crystal hexyloxycyanobiphenyl (6OCB) has been performed. To do so, the accurate evolution of various physical magnitudes (static dielectric permittivity data together with specific heat and volumetric determinations) around the N-to-I transition has been required. The specific heat data with the isobaric thermal expansion coefficient and the derivative of the static dielectric permittivity with temperature have been proven to be related to each other by a scaling relationship. However, some discrepancies have been observed for the dielectric data in relation to such a scaling relationship and the critical behavior of the N-to-I phase transition. All information has been used to get some insight on the strength of the first-order N-to-I phase transition of the 6OCB in relation to the other counterparts in the nOCB series of compounds.

show abstract

“…Vuks' method is based on the isotropic internal field model, whereas the other methods are based on the anisotropic internal field model. However, the S-values calculated by all these methods were found to be almost the same [21,22].…”

Section: The Order Parametermentioning

confidence: 99%

“…Many other studies [10][11][12][13][14][15] using birefringence data were done concerning binary mixtures bearing only different chain lengths while the polar terminal group was mostly fixed. In these studies, the order parameter was found to be sensitive at concentration near the eutectic composition, recording a value that is higher than those of the mixed single components.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Polar Substituents on the Optical Parameters of Binary Mixtures of 4-Substituted-phenyl-4-hexyloxybenzoates

Roushdy

2006

Molecular Crystals and Liquid Crystals

View full text Add to dashboard Cite

The refractive indices as a function of temperature were measured for the individual components of 4-substituted-phenyl-4-hexyloxybenzoates as well as their binary mixtures. In these components one terminal substitution is C 6 H 13 O and the other terminal is either the methoxy (CH 3 O), methyl (CH 3 ), cyano (CN), or nitro (NO 2 ) group. Refractive index data were used to estimate the molecular order parameter (S) and the length-to-breadth ratio (k) for all samples investigated. The entropy change (Ds c ) at the nematic-isotropic transition temperatures (T c ) was also calculated from differential scanning calorimetry data (DSC). The results were thoroughly analyzed and compared.

show abstract

Volume and polarisability anisotropy of hexoxy and heptoxy cyanobiphenyl liquid crystals and the eutectic mixture of E607

Cited by 15 publications

References 14 publications

Direct measurement of the propagation of the phase-transition region of liquid crystals

Direct measurement of the propagation of the phase-transition region of liquid crystals

Study of the Critical Behavior and Scaling Relationships at the N-to-I Phase Transition in Hexyloxycyanobiphenyl

Effect of the Polar Substituents on the Optical Parameters of Binary Mixtures of 4-Substituted-phenyl-4-hexyloxybenzoates

Contact Info

Product

Resources

About