Optical Properties of the Blue Phase of Cholesteric Liquid Crystals

Flack, J.; Crooker, P. P.; Johnson, D. Lynn; Long, Shine

doi:10.1007/978-1-4613-2661-8_55

Cited by 5 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This character was the same regardless of the sample preparation, for example, cooling rate, sample thickness, glass surface treatment, etc. Fractral appearance indicates a completely different structure from that of the conventional smectic phase, suggesting the formation of a three-dimensional helical structure like a blue phase or foggy phase. , We have tried to directly measure the helical structure by means of electron microscopy and atomic force microscopy. Unfortunately, however, we failed to obtain a satisfactory result.…”

Section: Resultsmentioning

confidence: 99%

Distinct Formation of a Chiral Smectic Phase in Achiral Banana-Shaped Molecules with a Central Core Based on a 2,7-Dihydroxynaphthalene Unit

et al. 2000

View full text Add to dashboard Cite

We have prepared a novel series of banana-shaped molecules with a central bent core based on a 2,7-dihydroxynaphthalene group, the side wings containing a Schiff's based moiety, and alkoxy flexible tails with carbon numbers n ) 6, 8, 10, 12, 14, and 16. Among these, the molecules with n ) 8-16 formed a novel smectic phase. Its smectic layer possessed a liquidlike association of the molecules similar to the SmA or SmC phase, although the texture that developed from the isotropic melt was unconventional. Small fractal domains initially grew and then coalesced into several large domains. Very weak birefringence and fine structure without any anisotropy are characteristic of this phase. It is interesting to note that two different domains exist showing the opposite sign of optical rotation. Strong circular dichroism (CD) with a peak at 430 nm was also observed for each domain with the opposite sign. The results suggest a natural occurrence of the helix in these materials. The right-handed and left-handed helices were formed with equal probabilities, but the left-handed helix was selectively formed by the introduction of a chiral dopant. The molecule with n ) 6 formed a frustrated smectic phase, which exhibited a simple fan-shaped texture.

show abstract

Section: Resultsmentioning

confidence: 99%

Distinct Formation of a Chiral Smectic Phase in Achiral Banana-Shaped Molecules with a Central Core Based on a 2,7-Dihydroxynaphthalene Unit

et al. 2000

View full text Add to dashboard Cite

show abstract

Recent developments in the physics of liquid crystals

Chandrasekhar

1988

Contemporary Physics

View full text Add to dashboard Cite

Some of the more recent advances in the field of liquid crystals are summarized, with emphasis on the experimental developments rather than their theoretical implications. A major part of the discussion is devoted to newly discovered phases and phase transitions, particularly those that are of special interest to condensed matter physicists. Observations are also described of two new phenomena, which, although predicted by the continuum theory, have eluded experimentalists for many years: (a) the appearance of a regular network of singular points at the nematic-isotropic interface and (b) the Lehmann rotation effect in cholesteric liquid crystals under the action of a d.c. electric field.

show abstract

The Effect of Electric Fields on Blue Phases

Kitzerow

1991

Molecular Crystals and Liquid Crystals

121

View full text Add to dashboard Cite

Optical Properties of the Blue Phase of Cholesteric Liquid Crystals

Cited by 5 publications

References 10 publications

Distinct Formation of a Chiral Smectic Phase in Achiral Banana-Shaped Molecules with a Central Core Based on a 2,7-Dihydroxynaphthalene Unit

Distinct Formation of a Chiral Smectic Phase in Achiral Banana-Shaped Molecules with a Central Core Based on a 2,7-Dihydroxynaphthalene Unit

Recent developments in the physics of liquid crystals

The Effect of Electric Fields on Blue Phases

Contact Info

Product

Resources

About