Cooperative nature of complex formation in mixed polyelectrolyte-surfactant systems

Article Abstract:

A study was conducted to analyze the binding of the cationic surfactant dodecylpyridinum chloride to various preformed anionic charged polyelectrolyte complexes. The complexes supported cationic copolymers with different charge densities. A 100 mL glass vessel with a turbidity sensor was utilized to carry out the polyelectrolyte titration experiments. Results indicated that binding correlated with the charge density of the polycation in the preformed polyelectrolyte complex aggregates.

Cations, Surface active agents, Electrolyte solutions, Anions, Chlorides

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Solvation of fluorinated single-wall carbon nanotubes in alcohol solvents

Article Abstract:

Highly purified single-wall carbon nanotubes (SWNTs) were fluorinated to produce fluorotubes, which were then solvated as individual tubes in various alcohol solvents through ultrasonication. Elemental analysis of the tubes indicated that light sonication in alcohol solvents does not eliminate substantial quantities of the fluorine. While these solutions were metastable, they will remain long enough to allow solution-phase chemistry to be performed on the fluorotubes.

Carbon, Nanotechnology, Alcohol, Ethanol, Fluorine

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X-ray-absorption fine-structure spectroscopy study of the interactions between contaminant tetrahedral anions and self-assembled monolayers on mesoporous supports

Article Abstract:

The chemical interaction between an interfacially bound copper ethylenediamine complex (Cu-(EDA)) and arsenate and chromate anions within these nanoporous hybrid material with X-ray-absorption fine-structure (XAFS) is presented. The reaction concluded that the average local Cu environment changes dramatically when an anion is bound to the Cu(EDA)3 complex.

Observations, X-rays, X-ray diffraction, Monomolecular films, Copper, Structure, Chemical properties

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