Elastic Constants of a Disc-Like Nematic Liquid Crystal: Pseudo-Molecular Approach

Simonário, P. S.; Andrade, T.M.; Freire, F. C. M.

doi:10.1007/s13538-015-0375-2

Cited by 2 publications

(3 citation statements)

References 26 publications

(68 reference statements)

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“…The prefactors were computed numerically even though it may be possible to derive rational prefactors upon extensive mathematical analysis that we did not pursue. The large splay-tot-bend ratio K 1 /K 3 1 (assuming c d > 1 in the nematic regime) is in agreement with earlier theoretical predictions [6,22,40,41] and experiments [42] on various thermotropic discotic nematics. The interrelation of the different moduli turns out to be quite different from those established for rod-based nematics.…”

Section: Elastic Moduli Of Nematic Fluids Of Disks and Rodssupporting

confidence: 90%

“…The large splay-tot-bend ratio K 1 /K 3 1 (assuming c d > 1 in the nematic regime) is in agreement with earlier theoretical predictions [6,22,40,41] and experiments [42] on various thermotropic discotic nematics. The interrelation of the different moduli turns out to be quite different from those established for rod-based nematics.…”

Section: Elastic Moduli Of Nematic Fluids Of Disks and Rodssupporting

confidence: 90%

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Frank elasticity of composite colloidal nematics with anti-nematic order

Wensink

2018

Soft Matter

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Mixing colloid shapes with distinctly different anisotropy generates composite nematics in which the order of the individual components can be fundamentally different. In colloidal rod-disk mixtures or hybrid nematics composed of anisotropic colloids immersed in a thermotropic liquid crystal, one of the components may adopt so-called anti-nematic order while the other exhibits conventional nematic alignment. Focussing on simple models for hard rods and disks, we employ Onsager-Straley's second-virial theory to derive scaling expressions for the elastic moduli of rods and disks in both nematic and anti-nematic configurations and identify their explicit dependence on particle concentration and shape. We demonstrate that the splay, bend and twist elasticity of anti-nematically ordered particles scale logarithmically with the degree of anti-nematic order, with the bend-splay ratio for anti-nematic discotic nematics being far greater than for conventional nematic systems. The impact of surface anchoring on the elastic properties of hybrid nematics will also be discussed in detail. We further demonstrate that the elasticity of mixed uniaxial rod-disk nematics depends exquisitely on the shape of the components and we provide simple scaling expressions that could help engineer the elastic properties of composite nematic liquid crystals. arXiv:1810.06988v1 [cond-mat.soft]

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Section: Elastic Moduli Of Nematic Fluids Of Disks and Rodssupporting

confidence: 90%

Section: Elastic Moduli Of Nematic Fluids Of Disks and Rodssupporting

confidence: 90%

Frank elasticity of composite colloidal nematics with anti-nematic order

Wensink

2018

Soft Matter

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show abstract

“…[8][9][10][11][12] The elastic force between the LC molecules, which has been proved to be the main driving force of the self-assembly, is relatively weak and makes it feasible to change the molecule orientation. [13][14][15] Therefore, LCs have inborn capabilities of response to external stimuli including surface alignment, magnetic field, and electric field (above the Freedericksz threshold). [16][17][18][19][20][21][22] In addition, the optical properties, such as birefringence, scattering and reflection, derived from the inherent arrangement of the molecules, are also basic characteristics of the LCs, and can be easily observed by naked eyes with some optical techniques.…”

Section: Introductionmentioning

confidence: 99%