Phys. Rev. Lett. 79, 2582–2585 (1997)Two-Dimensional Smectic Ordering of Linear DNA Chains in Self-Assembled DNA-Cationic Liposome MixturesReceived 18 March 1997; published in the issue dated 29 September 1997 We report a synchrotron x-ray scattering study of linear DNA chains and cationic liposome mixtures which spontaneously self-assemble into a coupled two-dimensional (2D) smectic phase of DNA chains imbedded between lipid bilayers of a 3D smectic phase. The DNA peak is quantitatively described by anisotropic exponentially decaying chain-chain correlations. The measured interchain compressibility modulus B(d) as a function of the interhelical spacing d of the 2D smectic, with 25<d<60Å, is not described by hard core repulsions but, rather, is dominated at larger spacings d>35Å by long-range electrostatic repulsions. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.2582
DOI:
10.1103/PhysRevLett.79.2582
PACS:
87.15.By, 61.30.Eb, 64.70.Md, 82.70.Kj
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