Kinetic behavior of Ti-doped NaAlH4 when cocatalyzed with carbon nanostructures

Article Abstract:

The effects of SWNTs, MWNTs, AC, C60 and G when used as a cocatalyst with Ti on the dehydrogenation and hydrogenation kinetics of NaAlH4 were investigated. It was found that all five carbons had significant, sustaining, and synergistic cocatalytic effects on the dehydrogenation and hydrogenation kinetics of Ti-doped NaAlH4, SWNTs were the best cocatalyst, G was the worst and all five carbons were inactive as catalysts unless Ti was present.

Structure, Nanotubes, Hydrogenation

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Deswelling kinetics of polyacrylate gels in solutions of cetyltrimethylammonium bromide

Article Abstract:

The semiempirical ion exchange model is used for describing the stagnant layer controlled deswelling kinetics of polyacrylate (PA)/cetyltrimethylammonium bromide ([C.sub.16]TAB). The results have shown long lag times for gels in low surfactant concentration, indicating a minimum amount of micelles being needed in the surface of the gel in order to start formation of the surface phase.

Plastics Material and Resin Manufacturing, Plastics materials and resins, Industrial inorganic chemicals, not elsewhere classified, Acrylic Resins, Bromine Compounds, Micelles

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Shrinking kinetics of polyacrylate gels in surfactant solution

Article Abstract:

Volume transition of covalently cross-linked sodium polyacrylate gels (micrometer-sized) due to the absorption of dodecyltrimethylammonium bromine from bulk aqueous solution is studied by means of light and fluorescence microscopy. Evidence is found for equilibrium between the core and surface phase in the collapsed state of the gel.

Usage, Fluorescence microscopy

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