Roke, S.Schins, J.Muller, M.Bonn, M.2013-02-082013-02-082013-02-08200310.1103/PhysRevLett.90.128101https://infoscience.epfl.ch/handle/20.500.14299/88729WOS:000181862600050The phase behavior of a DPPC monolayer on water was studied using vibrational sum-frequency spectroscopy (VSFG) in conjunction with fluorescence microscopy. A very sharp transition from a phase with curled alkyl chains to a phase with spatially extended chains was observed. The order and orientation of the alkyl chains throughout the phase diagram were determined.text::journal::journal article::research article