Entropy-stabilized smectic cphase in a system of zigzag-shaped molecules

Maiti, Prabal K. ; Lansac, Yves ; Glaser, Matthew A. ; Clark, Noel A. (2004) Entropy-stabilized smectic cphase in a system of zigzag-shaped molecules Physical Review Letters, 92 (2). Article ID 025501. ISSN 0031-9007

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Official URL: https://journals.aps.org/prl/abstract/10.1103/Phys...

Related URL: http://dx.doi.org/10.1103/PhysRevLett.92.025501


We report Monte Carlo simulations of a system of rigid zigzag-shaped molecules that demonstrate that simple excluded-volume interactions are sufficient to produce a fluid tilted lamellar [smectic C (SmC)] liquid crystal phase. The molecules are composed of three rigidly linked hard spherocylinders arranged in a zigzag fashion. By varying the zigzag angle we have mapped out the whole phase diagram as a function of pressure and zigzag angle Ψ. For Ψ between 35° and 80° our model simulation exhibits the SmC phase. This is the first conclusive evidence where steric interactions arising out of molecular shape alone induce the occurrence of the SmC phase for a wide range of zigzag angles. For smaller Ψ, a transition from tilted crystal to crystal is observed.

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ID Code:113258
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