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Pressure Induced Topological Phase Transitions in Membranes

P. T. C. So·Sol M. Gruner·Shyamsunder Erramilli
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Abstract

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 $L_α$) 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, $ΔV_{bh}$, decreases and appears to vanish as the pressure is increased. (iii) The intensity of scattered light increases as $ΔV_{bh}$ 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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P. T. C. So, Sol M. Gruner, Shyamsunder Erramilli. 1992-10-04. Pressure Induced Topological Phase Transitions in Membranes. https://doi.org/10.1103/physrevlett.70.3455

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