MOLECULAR-SCALE STRUCTURES OF LANGMUIR-BLODGETT-FILMS OF FATTY-ACIDS OBSERVED BY ATOMIC-FORCE MICROSCOPY

Langmuir-Blodgett films of arachidic acid, barium arachidate, and a mi xture of arachidic and behenic acids on a chemically flattened silicon substrate were observed by atomic force microscopy. The films were fo und to contact tightly with the substrate with a molecular slip at its steps. Lattice expansion due to barium ions was found on the barium a rachidate film but not on the pure acid film. In addition, the 2 x 2 s uperlattice was found on the barium arachidate film. The superlattice structure may be caused by the formation of a hydrogen salt. Although no phase separation was found on the film made of a 9:1 mixture of the acids, the image of the expected molecular mixture has not been obtai ned so far.