Volume 81, Number 6, March 2008
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||22 February 2008|
Topological defects in bicontinuous phases
Laboratoire de Physique des Solides, Université Paris-Sud - Bât. 510, 91405 Orsay, France
Accepted: 23 January 2008
It is shown that in balanced bicontinuous cubic lyotropic crystals two types of dislocations are possible. The first, trivial type of dislocations preserves the orientability of the surfactant bilayer. Dislocations of the second, Möbius type make the bilayer non-orientable. Upon melting of the cubic phase into the sponge phase, crystal order is destroyed but Möbius dislocations persist by virtue of topological continuity as disorientation: a new kind of topological defects which, by definition, alter the orientability of the bilayer.
PACS: 61.30.Jf – Defects in liquid crystals / 61.30.St – Lyotropic phases / 61.72.Bb – Theories and models of crystal defects
© EPLA, 2008
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