Physics – Condensed Matter – Materials Science
Scientific paper
2008-07-16
Chemical Physics Letters, Vol 405 (2005) 323-329
Physics
Condensed Matter
Materials Science
21 pages, 5 figures
Scientific paper
10.1016/j.cplett.2005.02.060
This communication reports the -A isotherms and spectroscopic characterizations of mixed Langmuir and Langmuir-Blodgett (LB) films of nonamphiphilic 2, -biquinoline (BQ) molecules, mixed with polymethyl methacrylate (PMMA) and stearic acid (SA). The pi-A isotherms and molefraction versus area per molecule studies indicate complete immiscibility of sample (BQ) and matrix (PMMA or SA) molecules. This immiscibility may lead to the formation of microcrystalline aggregates of BQ molecules in the mixed LB films. The scanning electron micrograph gives the visual evidence of microcrystalline aggregates of BQ molecules in the mixed LB films. UV-Vis absorption, fluorescence and excitation spectroscopic studies reveal the nature of these microcrystalline aggregates. LB films lifted at higher surface pressure indicate the formation of dimer or higher order n-mers.
Bhattacharjee Debajyoti
Biswas Santidan
Deb Subimal
Hussain Syed Arshad
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