Frustrated Spin-Gas Model for Doubly Reentrant Liquid Crystals

Berker, A. Nihat; Walker, James S.

doi:10.1103/physrevlett.47.1469

Cited by 104 publications

(40 citation statements)

References 11 publications

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“…Daniel Guillon, Jim Stamato V and I then measured Nihat Berker and collaborators developed a`frustration' theory of three body dipolar interactions [28]. Roughly layer spacings of compounds exhibiting re-entrant behaviour [23].…”

Section: Cb: 4-cyano-4'-octyloxybiphenylmentioning

confidence: 99%

The re-entrant nematic and the compounds of Gray

Cladis¹

1998

Liquid Crystals

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Section: Cb: 4-cyano-4'-octyloxybiphenylmentioning

confidence: 99%

The re-entrant nematic and the compounds of Gray

Cladis¹

1998

Liquid Crystals

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“…These results can be explained in terms of the photo-controlled nanophase segregation mechanism (19) and the frustrated spin-gas model (23), the principles of which are outlined in the following. When the UV radiation is absent the azo molecules are in their E form, which has a rod-like shape and they are therefore easily accommodated into the smectic layers.…”

Section: Dynamic Self-assembly Of the Smectic Phasementioning

confidence: 96%

Photoinduced phase transitions

Prasad¹,

Nair²,

Rao³

2009

Liquid Crystals

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Employing actinic light to alter/stabilise a particular thermodynamic phase via the photo-isomerisation of the constituent molecules is an interesting tool to investigate soft matter from a new dimension. This article focuses on our recent results on several aspects of these non-equilibrium phase transitions, which are isothermal in nature. We specifically discuss (i) the influence of different parameters, such as confinement, applied electric field, pressure etc., on the dynamics associated with both the photochemical transition driving the equilibrium nematic to the nonequilibrium isotropic phase and the thermal back relaxation recovering the nematic phase, (ii) unique light-driven disorder-order transition in a reentrant system, (iii) dynamic self-assembly of the smectic A phase, which is stabilised only in the presence of actinic light, (iv) novel temperature-intensity phase diagrams and an example of primary and secondary photo-ferroelectric effects in an antiferroelectric smectic C system. These results highlight the fact that the actinic light can be used as a new tool to study phase transitions and the associated critical phenomena that could also bring about effects that are not seen in equilibrium situations.

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“…[35,118] Berker and Indekeu have elaborated the so-called Free Gas Model in which a network consisting of trimers of molecules is considered. [119][120][121] Here a pair of molecules is strongly bonded into dimers via van der Waals forces, and the third molecule moves freely and may be oriented parallel or antiparallel to the nearest pair without change of the energetic state of such trimers. When a ferroelectric order is dominating then the SmA 1 phase appears.…”

Section: Further Evidence Of Molecular Associationsmentioning

confidence: 99%

From the discovery of the partially bilayer smectic A phase to blue phases in polar liquid crystals

Dąbrowski

2015

Liquid Crystals

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The significance of Gray's cyanobiphenyls in the discovery of the partially bilayer smectic A phase (SmA d ) and in the formulation of mixtures exhibiting the blue phase is described. The properties of the SmA d phase and its relationships to molecular structures are reviewed. Induced phenomena such as the transformation of nematics into smectics, SmA d or SmA 1 , as well as the opposite transformation of smectics into nematics are described and discussed.

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Frustrated Spin-Gas Model for Doubly Reentrant Liquid Crystals

Cited by 104 publications

References 11 publications

The re-entrant nematic and the compounds of Gray

The re-entrant nematic and the compounds of Gray

Photoinduced phase transitions

From the discovery of the partially bilayer smectic A phase to blue phases in polar liquid crystals

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