Alkali metal cations through supported

Reusch and Cussler were the first to describe crown ether-mediated transport of alkali metal cations through supported liquid membranes as ion pairs and derived for the initial flux Equation 11. 

Facilitated Transport of Alkali Metal Cations Through Supported Liquid Membranes with Fatty Acids... 

Acyclic oligoamides, 167-168,170/ Advancing front model, description, 116 Alkali metal cation facilitated transport through supported liquid membranes with fatty acids electrogenic processes, 79-81 electroneutral transport, 76-80 experimental description, 77 kinetics, 81-85... 

Intentional doping with alkali metal ions is widely used to reduce the activity of alumina in supported catalysts. It has also been shown that doping with cations of alkali metals, alkaline earth metals, and rare-earth metals increases the stabihty of alumina with respect to phase transitions and loss of surface area. To reduce the surface activity and to increase the stabihty of alumina for use as a support of metal catalysts in commercial appHcations, phases that have already gone through most of the possible structural evolution (0-AI2O3 or a-Al203) with moderate to low surface area (100 to 5 m g ) are needed doping with alkah metal, alkahne-earth metal, or rare earth metal cations may also be useful. Other impurities may be present in... 

Thus, the results, which have been obtained here concerning the spectroscopic behavior of the alkali metal salts of the polyethers, reflect those of the cation-selective transport by the nocyclic polyether carriers through a chloroform liquid membrane, and the mechanism for the appearence of the cation-selective transport, which we have proposed, could be supported spectrophotometrically. 

The use of 13a in the extraction process or in the transport through supported liquid membranes (SLMs) allows to recover more than 98% of the cesium cation present in solution, making this derivative extremely attractive for declassification of nuclear wastes. Ligand 13a was dso used for the selective detection of cesium in ISEs and ISFETs with very high selectivity and low detection limit. Very recently, we anchored calix[4]arene-crown-5 and -crown-6 derivatives on silica-gel via hydrosilanization and we were able to separate by chromatography potassium or cesium fi"om other alkali metal ions with high efficiency. ... 

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