Pressure Induced Topological Phase Transitions in Membranes

Details Pressure Induced Topological Phase Transitions in Membranes Pressure Induced Topological Phase Transitions in Membranes

1992-10-04

arxiv.org/abs/cond-mat/9210003v1

Physics

Condensed Matter

12 pages, typed using REVTEX 2.0

Scientific paper

10.1103/PhysRevLett.70.3455

Some highly unusual features of a lipid-water liquid crystal are revealed by high pressure x-ray diffraction, light scattering and dilatometric studies of the lamellar (bilayer $L_{\alpha}$) to nonlamellar inverse hexagonal ($H_{II}$) phase transition. (i) The size of the unit cell of the $H_{II}$ phase increases with increasing pressure. (ii) The transition volume, $\Delta V_{bh}$, decreases and appears to vanish as the pressure is increased. (iii) The intensity of scattered light increases as $\Delta V_{bh}$ decreases. Data are presented which suggest that this increase is due to the formation of an intermediate cubic phase, as predicted by recent theoretical suggestions of the underlying universal phase sequence.

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