An analogy between biaxial crystal and biaxial nematic lyotropic phase

Souza, Glauco R.; Oliveira, D.A; Lüders, D.D.; Kimura, N.M.; Simões, M.; Palangana, A. J.

doi:10.1016/j.molliq.2010.05.019

Cited by 26 publications

(3 citation statements)

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“…Over the years much progress has taken place in biaxial nematic phase (N B ) both experimentally [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and theoretically . The existence of the N B phase in lyotropic liquid crystals was first discovered experimentally by Saupe and coworkers [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Mean-field theory of isotropic-uniaxial nematic-biaxial nematic phase transitions in an external field

Mukherjee

Mandal³

2019

Phys. Scr.

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We present a simple mean-field theory to study the effects of an external magnetic field on biaxial nematic liquid crystals. Isotropic-uniaxial nematic-biaxial nematic phase sequence in an external magnetic field is described. We determine the temperature-field phase diagrams. The model predicts two new phase diagrams. It is shown that in the presence of the magnetic field, the first order uniaxial nematic to biaxial nematic and isotropic to uniaxial nematic phase transitions become second order transition at a tricritical point.

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Section: Introductionmentioning

confidence: 99%

Mean-field theory of isotropic-uniaxial nematic-biaxial nematic phase transitions in an external field

Mukherjee

Mandal³

2019

Phys. Scr.

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“…The refractive index also differs significantly: at 293 K and at 589.3 nm, the refractive index of water is 1.333 00, while heavy water is 1.328 30 . Historically, the refractive index was used to determine the purity of a material but now is needed in light scattering, ultrasonic velocity, and composition determinations. , The refractive index literature values ,, for D 2 O are given as tables using wavelengths emitted by excited gases (mercury, sodium, etc. ), and it is tedious to interpolate in both temperature and wavelength to arrive at a value needed at laser emissions in the visible.…”

Section: Introductionmentioning

confidence: 99%

“…While such discrepancies may not be significant to the reported investigation, they do indicate a need for an easy way to obtain n for D 2 O at different temperatures and wavelengths. More accurate and precise values for n are essential when using refractive index as a way of determining the composition of a D 2 O mixture. , …”

Section: Introductionmentioning

confidence: 99%

Refractive Index of Liquid D₂O for Visible Wavelengths

Odhner

Jacobs

2011

J. Chem. Eng. Data

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The index of refraction for D 2 O at common wavelengths was measured for several temperatures at atmospheric pressure. While heavy water's refractive index was precisely measured decades ago using the transition lines of elements, those wavelengths are seldom used now that inexpensive lasers provide a range of available wavelengths. We review those measurements, note some inconsistencies between research groups, and fit the best of the literature data to a simple equation that allows an easy calculation for the refractive index of D 2 O with an accuracy of ( 0.0002 at any visible wavelength and between (278 and 359) K. To verify the equation, we then compare the calculated refractive index to our measured values for three HeÀNe laser wavelengths (543.5, 594.1, and 632.8) nm over a temperature range from (288 to 338) K and find good agreement.

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