Weak Chirality in Ordered DNA Phases

Details Weak Chirality in Ordered DNA Phases Weak Chirality in Ordered DNA Phases

1996-06-06

arxiv.org/abs/cond-mat/9606028v2

Mol. Cryst. Liq. Cryst. 299 (1997) 265

Physics

Condensed Matter

11 pages, plain TeX, 3 figures, requires epsf.tex. To appear in the Proceedings of the 16th International Liquid Crystal Confe

Scientific paper

Recent experiments on aligned DNA show hexatic order with no sign of macroscopic chirality. I make the analogy between smectic liquid crystals and chiral hexatics and show how the absence of chirality cannot occur in a thermodynamic phase of chiral molecules. In addition, I discuss the microscopic origin of chiral mesophases in liquid crystals and show that, within the context of central forces between "atoms" on "molecules", chiral interactions can occur only if there are biaxial correlations between the mesogens. Weak biaxial correlations can therefore lead to small cholesteric pitches.

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