Abstract
Surface pressure-molecular area (π-A) isotherms of mixed Langmuir monolayers of stearic acid (StA) and monomers based on 3,4-alkylenedioxythiophene (ADOTs), have been studied. Preliminary results show less (more) increase in A than expected, with increase in molar concentration for monomer M1 viz. 3,4-ethylenedioxythiophene (EDOT) (its long chain counterpart, M2). Presence of ferric chloride in subphase causes A to increase considerably for M1, but has no effect on M2. Moreover, unlike in M1, systematic decrease in slope m of ‘liquid’ L2, L2′ phases and ‘solid’ S phase with increase in concentration of M2 indicate decreased complexity of system compared to StA. Again, in presence of ferric chloride, m was found to decrease in M1, but remain unchanged in M2. Results indicate strong interplay of hydrophobic and hydrophilic interactions at air-water interface, mediated through probable interaction with subphase ions and hydrocarbon chains. Findings are a first step towards understanding structural changes occurring during oxidative surface polymerization of oriented transparent conducting polymers (TCPs).
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