Figure 1

Grazing incidence x-ray diffraction data: scattering intensity, integrated over $q_z$ range, against scattering vector $q_{xy}$ of (a) pure DPPC and the cholesterol-DPPC mixture with ${\chi }_{\mathrm{CHOL}}=0.13$; (b) cholesterol-DPPC mixture with ${\chi }_{\mathrm{CHOL}}=0.25$, ${\chi }_{\mathrm{CHOL}}=0.46$, and ${\chi }_{\mathrm{CHOL}}=0.7$; (c) pure cholesterol and the cholesterol-DPPC mixture with ${\chi }_{\mathrm{CHOL}}=0.85$. The cartoon schematics of the in-plane lateral molecular distribution in the mixtures with (d) ${\chi }_{\mathrm{CHOL}}=0.13$ (the condensed phase is mainly DPPC), (e) ${\chi }_{\mathrm{CHOL}}=0.25–0.7$ (the condensed phase is the mixture of cholesterol and DPPC with the stoichiometry identical to that of the film), and (f) ${\chi }_{\mathrm{CHOL}}=0.85$ (the condensed phase is mainly cholesterol).Reuse & Permissions

Figure 2

(a) X-ray reflectivity data (symbols) and corresponding fits (lines) normalized by Fresnel reflectivity plotted against scattering vector $q_z$ of (top panel) pure DPPC (triangles) and pure cholesterol (squares); (bottom panel) mixed cholesterol-DPPC monolayers with 13 (squares), 25 (triangles), 46 (circles), 70 (inverted triangles), and 85 (diamonds) mol% of cholesterol. For clarity the data have been offset vertically. (b) A representative electron density distribution in cholesterol-DPPC mixed monolayer perpendicular to the aqueous interface together with the cartoon schematics of the corresponding out-of-plane molecular arrangement in the mixtures with (top panel) ${\chi }_{\mathrm{CHOL}}=0.13–0.46$ and (bottom panel) ${\chi }_{\mathrm{CHOL}}=0.85$.Reuse & Permissions