Monolayer Characteristics of Pyrene Mixed with Stearic Acid at the Air-Water Interface

TL;DR

This study investigates the monolayer behavior of pyrene mixed with stearic acid at the air-water interface, revealing their miscibility and phase separation through surface pressure-area isotherms and BAM imaging.

Contribution

It provides new insights into the monolayer properties and miscibility of pyrene and stearic acid at the air-water interface.

Findings

Pyrene and stearic acid are found to be miscible in the monolayer.

Phase separation occurs between pyrene and stearic acid.

BAM imaging confirms the miscibility and non-ideal mixing.

Abstract

In the present communication we report the monolayer characteristics of pyrene mixed with stearic acid (SA) at the air-water interface. The monolayer properties are investigated by recording and analyzing the surface pressure-area per molecule isotherm (pi-A) of the pyrene-SA mixed films. It is observed that the pyrene and SA are miscible in the mixed monolayer. This miscibility/nonideality leads to phase separation between the constituent components (pyrene and SA). BAM image of the mixed monolayer confirms the miscibility or nonideal mixing at the mixed monolayer.