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000821204 1001_ $$0P:(DE-HGF)0$$aSalamonczyk, Miroslaw$$b0
000821204 245__ $$aSmectic phase in suspensions of gapped DNA duplexes
000821204 260__ $$aLondon$$bNature Publishing Group$$c2016
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000821204 520__ $$aSmectic 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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000821204 7001_ $$0P:(DE-Juel1)168533$$aZhang, Jing$$b1
000821204 7001_ $$0P:(DE-HGF)0$$aPortale, Giuseppe$$b2
000821204 7001_ $$0P:(DE-HGF)0$$aZhu, Chenhui$$b3
000821204 7001_ $$0P:(DE-Juel1)130754$$aKentzinger, Emmanuel$$b4
000821204 7001_ $$0P:(DE-HGF)0$$aGleeson, James T.$$b5
000821204 7001_ $$0P:(DE-HGF)0$$aJakli, Antal$$b6
000821204 7001_ $$0P:(DE-HGF)0$$aDe Michele, Cristiano$$b7$$eCorresponding author
000821204 7001_ $$0P:(DE-Juel1)130616$$aDhont, Jan K. G.$$b8
000821204 7001_ $$0P:(DE-HGF)0$$aSprunt, Samuel$$b9
000821204 7001_ $$0P:(DE-Juel1)130987$$aStiakakis, Emmanuel$$b10$$eCorresponding author
000821204 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/ncomms13358$$gVol. 7, p. 13358 -$$p13358 -$$tNature Communications$$v7$$x2041-1723$$y2016
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