Ion exchange in micellar solutions. 4. "Buffered" systems

1980 ◽  
Vol 84 (4) ◽  
pp. 361-365 ◽  
Author(s):  
Frank H. Quina ◽  
Mario J. Politi ◽  
Iolanda M. Cuccovia ◽  
Elisa Baumgarten ◽  
Sandra M. Martins-Franchetti ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Micellar Solutions

Counterion micellar effects upon the reaction of low-spin diimine iron(II) complexes

1989 ◽  
Vol 67 (2) ◽  
pp. 305-309 ◽  
Author(s):  
Francisco Ortega ◽  
Elvira Rodenas
Keyword(s):  
Ion Exchange ◽  
Exchange Model ◽  
Micellar Solutions ◽  
Micellar Effects ◽  
Hydroxide Ion ◽  
Cationic Micelles ◽  
Rate Effects ◽  
Rate Of Reaction

The rate of reaction of tris(1,10-phenanthroline)iron(II) ion (1a), tris(3,4,7,8-tetramethyl-1,10-phenanthroline)iron(II) ion (1b), and tris(4,7-diphenhyl-1, 10-phenanthroline)iron(II) ion (1c) with hydroxide ion, in cationic micelles, is strongly affected by the concentration of micellar counterion in solution. The reaction of la in CTACl is modestly speeded up by the addition of added KCl, while the reactions of 1b and 1c are strongly inhibited by the addition of large amounts of KCl and KBr to micellar solutions of CTACl and CTABr, respectively. These rate effects fit the pseudophase-ion exchange model, assuming the binding of the substrates to the micelles depends upon the counterion concentration. Keywords: counterion micellar effects, low-spin diimine iron(II) complexes.

Ion exchange in micellar solutions. 7. Effect of detergent structure on the binding and reactivity of hydroxide in cationic micellar solutions

1982 ◽  
Vol 86 (25) ◽  
pp. 4941-4947 ◽  
Author(s):  
Joao B. S. Bonilha ◽  
Glaico Chiericato ◽  
Sandra M. Martins-Franchetti ◽  
Edson J. Ribaldo ◽  
Frank H. Quina
Keyword(s):  
Ion Exchange ◽  
Micellar Solutions

Ion exchange in micellar solutions. 2. Binding of hydroxide ion to positive micelles

1979 ◽  
Vol 83 (14) ◽  
pp. 1851-1854 ◽  
Author(s):  
H. Chaimovich ◽  
J. B. S. Bonilha ◽  
M. J. Politi ◽  
F. H. Quina
Keyword(s):  
Ion Exchange ◽  
Micellar Solutions ◽  
Hydroxide Ion

Embedding Procedure for Water Swollen Samples

1970 ◽  
Vol 28 ◽  
pp. 504-505
Author(s):  
Ann M. Thomas ◽  
Virginia Shemeley
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ion Exchange ◽  
Structural Changes ◽  
Cross Linking ◽  
Ion Exchange Resins ◽  
Transmission Electron ◽  
First Pass ◽  
Exchange Resins

Those samples which swell rapidly when exposed to water are, at best, difficult to section for transmission electron microscopy. Some materials literally burst out of the embedding block with the first pass by the knife, and even the most rapid cutting cycle produces sections of limited value. Many ion exchange resins swell in water; some undergo irreversible structural changes when dried. We developed our embedding procedure to handle this type of sample, but it should be applicable to many materials that present similar sectioning difficulties.The purpose of our embedding procedure is to build up a cross-linking network throughout the sample, while it is in a water swollen state. Our procedure was suggested to us by the work of Rosenberg, where he mentioned the formation of a tridimensional structure by the polymerization of the GMA biproduct, triglycol dimethacrylate.

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