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Study of Miscibility and Aggregate Formation in Nano-Dimensional Langmuir-Blodgett Films of p-Quaterphenyl with Stearic Acid

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The behavior of binary mixed Langmuir monolayers from p-Quaterphenyl (QP) and stearic Acid (SA) at the air–water interface was investigated on the basis of the analysis of surface pressure-average area per molecule (π–A) isotherms. Hysteresis study of mixed monolayers indicates the formation of stable monolayers at the air–water interface. The mixing behavior was obtained from the (π–A) isotherms studies using surface phase rule and excess area criterion. The positive deviation of the observed area per molecule from ideal curve corresponding to the additivity rule suggests a repulsive interaction between the components in the mixed films. Collapse pressure versus mole fraction curve indicates that QP and SA are immiscible over a wide range of compositions. This immiscibility leads to the formation of microcrystalline aggregates of QP in the mixed Langmuir-Blodgett (LB) films. UV-vis absorption spectroscopic studies of LB films reveal a broadening and blue shift of the absorption spectra compared to the solution spectrum that confirms the formation of organized aggregates of QP in the mixed LB films. Scanning electron microscopy (SEM) image definitely supports this observation.
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Keywords: ABSORPTION SPECTROSCOPY; AGGREGATES; AIR-WATER INTERFACE; QP; SEM

Document Type: Short Communication

Publication date: 01 June 2011

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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