LINEAR COMPRESSION OF A MIXED ADSORBED MONOLAYER

The theory for the compression of an adsorbed soluble monolayer was ex tended to systems containing two surfactants. This theory was confirme d experimentally for decanoic and dodecanoic acid mixtures, The parame ters needed to describe the compression curves were estimated from the behavior of the pure systems, For doing this, solutions of decanoic a nd dodecanoic acid were prepared in such a way that the equilibrium ad sorptions were nearly the same. Also, in the mixed systems, the sum of the adsorption of both components were equal, allowing reasonable pre diction of the parameters needed to describe the experimental results, The agreement between theory and the experiments is good, From these experiments, we can obtain the surface elasticity for mixed monolayers as a function of the effective time. (C) 1996 Academic Press, Inc.