Gas permeability in polymer- and surfactant-stabilized bubble films

Article Abstract:

The diminishing bubble method was used to study the gas permeabilities of thin liquid films stabilized by poly(N-isopropylacrylamide) (PNIPAM) and PNIPAM-SDS (sodium dodecyl sulfate) mixtures. In the presence of SDS, both the film homogeneity and the gas permeability coefficient increase. These changes are related to interactions of PNIPAM with SDS in the solution and at the interface, where coadsorption of the two species forms mixed layers that are stable but that are more porous to gas transfer.

Surfaces (Physics), Structure

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External electric field effects on fluorescence of pyrene butyric acid in a polymer film: Concentration dependence and temperature dependence

Article Abstract:

The electric field effects on fluorescence spectra of pyrene butyric acid (PBA) embedded in a poly(methyl methacrylate) (PMMA) matrix are examined at various concentrations and at different temperatures. The presence of [b.sub.LT](II) and the temperature dependence of locally excited fluorescence (LE-F) depend on the concentration of PBA in a polymer film, indicating that the emitting state of [b.sub.LT](II) is produced through the LE state.

Thermal properties, Electric fields

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Optically active polymer carbon nanotube composite

Article Abstract:

A completely soluble optically active polyaniline-multiwalled carbon nonotube composite is investigated by spectroscopic and microscopic techniques. It is found that the polymer's optical activity is retained in the presence of carbon nanotubes and solutions are found to be easily processable into thin films, which exhibited dendritic structures only in the presence of nanotubes.

Analysis, Spectrum analysis, Spectroscopy

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