Fig. 6.

(a) Contrast matching scheme of lipid vesicles for small angle neutron scattering, adapted from Heberle et al. (2013). Lipid deuteration is tuned such that, the neutron scattering length density (SLD) of the lipids matches that of the surrounding fluid when the lipids are mixed. When the lipids phase separate, an SLD contrast is developed and the neutrons scatter from the compositional variations, directly probing our order parameter ϕ(x). (b) Neutron scattering data from lipid vesicles (points) and fits to the microemulsion theory reviewed here (dashed lines), taken from Bolmatov et al. (2019). (c) Neutron scattering data fit to a more detailed, microscopic model of lipid domain configurations, taken from Heberle et al. (2013). The inset shows lipid mixtures at low (20 °C, dark gray line) and high (50 °C, light gray line) temperatures.