Hydration and interfacial water in Nafion membrane probed by transmission infrared spectroscopy

Article Abstract:

Infrared spectroscopy is used to detect water inside pores and channels of Nafion membrane exchanged with ether proton ([H.sup.+]) or sodium ions ([Na.sup.+]). Control experiments performed with poly(hexafluoropropylene-co-tetrafluoroethylene) (FEP) membrane have not shown any evidence for water or methanol permeation, demonstrating the crucial role played by the ion-filled channels and pores in facilitating solvent transport within Nafion membrane.

Usage, Spectra, Infrared spectroscopy

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Ca(super 2+)-induced thermoreversible and controllable complexation of poly(N-vinylcaprolactum-co-sodium acrylate) microgels in water

Article Abstract:

A study is performed to examine the Ca(super 2+)-induced thermoreversible and controllable complexation of poly(N-vinylcaprolactam-co-sodium acrylate) microgels in water and determine the possibility of using poly(N-vinylcaprolactum) (PVCL) microgels as an injecting composition for certain biomedical applications. Results indicate that the extent of complexation increases with the increase in the concentration of Ca(super 2+).

Calcium & Compounds, Calcium compounds

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Fast ring-shape self-assembling in water-based ink-jetted droplets

Article Abstract:

A study presents a phenomenon of ring pattern formation of nanoparticles in small ink-jetted droplets (30-60 mum diameter) of water-based suspensions on substrate, which occurs in several seconds. It is learnt that the self-assembling ring pattern is formed during 3-10 s in water-based pigment (Cu-phthalocyanine) ink-jetted droplets if sodium dodecyl sulfate surfactant is added at 1-3% (w/w) level.

Copper compounds, Structure

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