Possibility of controlling the in-plane anisotropy in Langmuir-Blodgett films

Abstract

An extended model of flow orientation has been developed for analyz ing the in-plane anisotropy in Langmuir-Blodgett (LB) films. In the model deve loped, the velocity potential is derived for a sys tem with a two-dimensional fluid and a sink, which repres ent the mo no la yer at the air-water interface and the substrate, respectively. The rotatory mo tion in this field is examined assuming a Bingham plasticity. Thus obtained angular distribution function is found to satisfactorily explain the anisotropic absorbance and ESR line shape of the mixed LB films of a meroeyanine and a fatty acid, indic ating the possibility of controlling the in plane anisotropy in LB films by adjusting the values of parameters involved in the model.