Abstract
By using grazing incidence X-ray diffraction, we determined the structure of the solid phase of a C 18C 18 phosphocholine monolayer spread at the air-formamide interface. The chains are organized on an oblique lattice, and their tilt, measured from Bragg rod scans, is about 35°. No structural change is observed when the surface pressure is varied from 1 to 38 mN/m. In the solid phase, the area per molecule is 46 Å 2, and the compression modulus is large. The phase stiffness is dominated by the interactions between the polar heads and the formamide, more than between the aliphatic chains.
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