Lateral Diffusion Study of Amphiphiles in Air‒Water Monolayer Films of Polymerizable Surfactants

Abstract

The behavior of the chromophore N-[(l-pyrenylsulfonyl)dipalmitoyl]-L-α-phosphatidylethanolamine (pyrene-DPPE) embedded in unpolymerized and polymerized air‒water monolayers of 10,12-nonacosadiynoic acid (diacetylene 16-8), octadecyl methacrylate (ODMA) and (octadecyldimethylammonio)-ethyl methacrylate bromide (ODAEMA), has been investigated by using surface pressure‒area isotherm measurements, and steady-state and time-resolved fluorescence spectroscopy. Steady-state fluorescence measurements revealed pyrene-DPPE to be homogeneously distributed in the diacetylene 16‒8 monolayer only in the liquid-expanded (LE) phase on an alkaline subphase. The lateral diffusion coefficients determined for t..