Properties of LangmuirBlodgett Films Based on Methyl Orange
and Polyamide Acid

S. N. Shtykov, B. N. Klimov, T. D. Smirnova, E. G. Glukhovskoi,
E. V. Istrashkina, and E. G. Sumina

Saratov State University, ul. Universitetskaya 42, Saratov, 410601 Russia

Received April 12, 1996

Abstract—A procedure of preparation of multilayer Langmuir–Blodgett (LB) films based on a salt of polya-
mide acid (PAA) and octadecyldimethylamine (ODMA) with addition of the acid–base azo indicator methyl
orange is described. A isotherms are used to determine an optimum ratio of components for the formation of
LB films the area per monomer unit. The absorption spectra and protolytic properties of the indicator in aqueous
media with and without ions and micelles of a cationic surfactant, cetyltrimethylammonium bromide, and in
LB films based on PAA and ODMA are compared. Plausible causes of low values of pK for the indicator in
aqueous solutions and LB films in the presence of cationic surfactants are considered.

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