Tyrode, Eric C.; Corkery, R.
The charging of arachidic acid Langmuir monolayers as a
function of subphase pH and monovalent ion concentration below 100 mM
was investigated using vibrational sum frequency spectroscopy. Molecular
information was obtained by targeting the vibrational modes of the
carboxylic acid headgroups, alkyl chains, and water molecules in the
immediate surface and diffuse double layers. The surface charge in the
monolayer was experimentally determined by monitoring the hydrated
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