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- W2552586449 abstract "Smectic ordering in aqueous solutions of monodisperse stiff double-stranded DNA fragments is known not to occur, despite the fact that these systems exhibit both chiral nematic and columnar mesophases. Here, we show, unambiguously, that a smectic-A type of phase is formed by increasing the DNA's flexibility through the introduction of an unpaired single-stranded DNA spacer in the middle of each duplex. This is unusual for a lyotropic system, where flexibility typically destabilizes the smectic phase. We also report on simulations suggesting that the gapped duplexes (resembling chain-sticks) attain a folded conformation in the smectic layers, and argue that this layer structure, which we designate as smectic-fA phase, is thermodynamically stabilized by both entropic and energetic contributions to the system's free energy. Our results demonstrate that DNA as a building block offers an exquisitely tunable means to engineer a potentially rich assortment of lyotropic liquid crystals." @default.
- W2552586449 created "2016-11-30" @default.
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- W2552586449 date "2016-11-15" @default.
- W2552586449 modified "2023-10-16" @default.
- W2552586449 title "Smectic phase in suspensions of gapped DNA duplexes" @default.
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- W2552586449 doi "https://doi.org/10.1038/ncomms13358" @default.
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