We present a molecular resolved image of a supported lipid bilayer using atomic force microscopy in liquid conditions. Due to the well-known molecular diffusion processes with velocities of a few nm/s occurring in free-standing membranes, this type of mapping is difficult to achieve. We have obtained a sub-nanometer scale resolution of a dioleoyl-sn-glycero-phosphocholine membrane because of the high sensitivity of our phase modulated microscope and the slowed down diffusion due to the interaction with the substrate. A pair function analysis has revealed local disordered and gel phases with an order range limited to the first neighbour.

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