Kinetics of water sorption in Nafion thin films-quartz crystal microbalance study

Article Abstract:

The study uses quartz crystal microbalance (QCM) measurements to follow kinetics of water sorption in a thin Nafion film to clarify the discrepancy of the water transport data. The results concluded that the kinetics of water sorption in the partially hydrated Nafion exposed to water vapor is controlled by the first-order process of water transfer in and out of the nanoscopic hydrophilic regions for membranes thinner than 10 mue.

Electronic components, not elsewhere classified, All Other Miscellaneous Nonmetallic Mineral Product Manufacturing, Quartz Crystals, Chemical properties

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Water vapor barrier properties of transparent SnO2-SiO(sub x) composite films on polymer substrate

Article Abstract:

Composite thin films consisting of silicon oxide and tin oxide are deposited on polycarbonate substrates as gas barrier films, with the help of a thermal evaporation process in an oxygen gas environment. The chemical interaction of water vapor with oxide films is investigated by considering the refractive index obtained from ellipsometry and the OH group peak from X-ray photoelectron spectroscopy.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Silicon Dioxide, Photoelectron spectroscopy

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Effect of a reduced mobility layer on the interplay between molecular relaxations and diffusion-limited crystallization rate in ultrathin polymer films

Article Abstract:

The effect of the reduced mobility layer at the interface with the substrate on the crystallization rate in ultrathin polymer films is analyzed. The films have shown higher glass stability in terms of an increase of the cold crystallization temperature and of the crystallization time and the deviations from bulk behavior have vanished above a crossover temperature.

Polymers, Optical properties, Crystallization

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