DEPENDENCE OF LANGMUIR-BLODGETT-FILM QUALITY ON FATTY-ACID MONOLAYER INTEGRITY .2. CRUCIAL EFFECT OF THE REMOVAL RATE OF MONOLAYER DURING LANGMUIR-BLODGETT-FILM DEPOSITION

The quality of LB films was investigated by studying a new parameter, referred to as the monolayer deposition rate (R(D)). This parameter, corresponding to the actual velocity at which the monolayer is removed from the water surface, takes into account both the dipping rate of the substrate and its area. It controls the speed of compression of the monolayer and, consequently, influences directly the rate of appearance of potential sites of crystal formation in the monolayer at the air-water interface. During the transfer of the monolayer onto the substrate, this number of potential sites of crystal formation seems to be modified according to the type of the molecule-substrate interaction, hydrophobic or hydrophilic.