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| VOLUME 64 (1996) | ISSUE 8 |
PAGE 564
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Landau-Brazovskii theoty fot the Ia3d structure
Podneks V.E., Hamley I.W.
The stability of the so-called "Gyroid" phase, of laid symmetry, observed for lyotropic liquid crystals and block copolymers is accounted for using the Landau-Brazovskii theory of weak crystallization. In the mean field approximation, the Ja3d phase is stable between the lamellar and hexagonal phases close to the disordered liquid phase. When allowance is made for Brazovskii critical fluctuations, a direct phase transition between the disordered liquid and Ia3d phases is shown to be possible, in agreement with experimental observations. PACS: 61.25.Hq, 64.60.Cn, 64.70.Md
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![](/ps/983/article_14979_800_head.png "<b>The stability of the so-called "Gyroid" phase, of <i>laid </i>symmetry, observed for lyotropic liquid crystals and block copolymers is accounted for using the Landau-Brazovskii theory of weak crystallization. In the mean field approximation, the <i>Ja3d </i>phase is stable between the lamellar and hexagonal phases close to the disordered liquid phase. When allowance is made for Brazovskii critical fluctuations, a direct phase transition between the disordered liquid and <i>Ia3d </i>phases is shown to be possible, in agreement with experimental observations.</b> <b>PACS: 61.25.Hq, 64.60.Cn, 64.70.Md</b>")