Supramolecular dendritic liquid quasicrystals

Xiangbing Zeng, Goran Ungar (), Yongsong Liu, Virgil Percec, Andrés E. Dulcey and Jamie K. Hobbs
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Xiangbing Zeng: University of Sheffield
Goran Ungar: University of Sheffield
Yongsong Liu: University of Sheffield
Virgil Percec: University of Pennsylvania
Andrés E. Dulcey: University of Pennsylvania
Jamie K. Hobbs: University of Bristol

Nature, 2004, vol. 428, issue 6979, 157-160

Abstract: Abstract A large number of synthetic and natural compounds self-organize into bulk phases exhibiting periodicities on the 10-8–10-6 metre scale1 as a consequence of their molecular shape, degree of amphiphilic character and, often, the presence of additional non-covalent interactions. Such phases are found in lyotropic systems2 (for example, lipid–water, soap–water), in a range of block copolymers3 and in thermotropic (solvent-free) liquid crystals4. The resulting periodicity can be one-dimensional (lamellar phases), two-dimensional (columnar phases) or three dimensional (‘micellar’ or ‘bicontinuous’ phases). All such two- and three-dimensional structures identified to date obey the rules of crystallography and their symmetry can be described, respectively, by one of the 17 plane groups or 230 space groups. The ‘micellar’ phases have crystallographic counterparts in transition-metal alloys, where just one metal atom is equivalent to a 103 - 104-atom micelle. However, some metal alloys are known to defy the rules of crystallography and form so-called quasicrystals, which have rotational symmetry other than the allowed two-, three-, four- or six-fold symmetry5. Here we show that such quasiperiodic structures can also exist in the scaled-up micellar phases, representing a new mode of organization in soft matter.

Date: 2004
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DOI: 10.1038/nature02368

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