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The effects of pressure and temperature on the energetics and pivotal surface in a monoacylglycerol/water gyroid inverse bicontinuous cubic phase

DOI: 10.1039/c4sm00114a DOI Help

Authors: T.-y. Dora Tang (Imperial College London) , Annela Seddon (University of Bristol) , Christoph Jeworrek (Technische Universit├Ąt Dortmund) , Roland Winter (Technische Universit├Ąt Dortmund) , Oscar Ces (Imperial College London) , John Seddon (Imperial College London) , Richard H. Templer (Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Soft Matter , VOL 10 (17)

State: Published (Approved)
Published: February 2014

Open Access Open Access

Abstract: We have studied the effect of pressure and temperature on the location of the pivotal surface in a lipid inverse bicontinuous gyroid cubic phase (QGII), described by the area at the pivotal surface (An), the volume between the pivotal surface and the bilayer midplane (Vn), and the molecular volume of the lipid (V). Small angle X-ray scattering (SAXS) was used to measure the swelling behaviour of the lipid, monolinolein, as a function of pressure and temperature, and the data were fitted to two different geometric models: the parallel interface model (PIM), and the constant mean curvature model (CMCM). The results show that an increase in temperature leads to a shift in the location of the pivotal surface towards the bilayer midplane, whilst an increase in pressure causes the pivotal surface to move towards the interfacial region. In addition, we describe the relevance of An, Vn and V for modeling the energetics of curved mesophases with specific reference to the mean curvature at the pivotal surface and discuss the significance of this parameter for modelling the energetics of curved mesophases.

Subject Areas: Biology and Bio-materials, Physics, Chemistry


Instruments: I22-Small angle scattering & Diffraction

Other Facilities: Yes, ESRF

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The effects of pressure and temperature.pdf