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100 1 _ |a Salamonczyk, Miroslaw
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245 _ _ |a Smectic phase in suspensions of gapped DNA duplexes
260 _ _ |a London
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520 _ _ |a 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.
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700 1 _ |a Zhang, Jing
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700 1 _ |a Portale, Giuseppe
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700 1 _ |a Zhu, Chenhui
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700 1 _ |a Kentzinger, Emmanuel
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700 1 _ |a Gleeson, James T.
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700 1 _ |a Jakli, Antal
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700 1 _ |a De Michele, Cristiano
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700 1 _ |a Dhont, Jan K. G.
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700 1 _ |a Sprunt, Samuel
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700 1 _ |a Stiakakis, Emmanuel
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773 _ _ |a 10.1038/ncomms13358
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