NMR Self-Diffusion of Associative Polymers in Aqueous Solution: The Influence of the Hydrocarbon End-Chain Length on the Polymer Transport Dynamics in Single- and Two-Component Mixtures

1997 ◽  
Vol 189 (1) ◽  
pp. 137-143 ◽  
Author(s):  
S. Abrahmsén-Alami ◽  
P. Stilbs

1979 ◽  
Vol 44 (4) ◽  
pp. 1015-1022 ◽  
Author(s):  
Viliam Múčka

The catalytic properties of two-component catalyst nickel oxide-cadmium oxide with the proportions of the components covering the whole composition region 0-100% were examined by studying the decomposition of hydrogen peroxide in aqueous solution on it. In the range 0-25 mol.% CdO, cadmium oxide is found to affect infavourably the ability of nickel oxide to chemisorb oxygen. The amount of the chemisorbed oxygen increases several times on gamma irradiation of the samples. The effect of cadmium oxide on the catalytic activity of the system shows up in fresh samples only indirectly via the changed amount of the oxygen chemisorbed. In older samples the initial catalytic activity of the system is changed, which can be explained based on the concept of bivalent catalytic centres in terms of the co-action of the catalytic centres of the two oxides, which are in equilibrium. The irradiation of the system under study speeds up the processes leading to the establishing of this equilibrium which is thermally very stable, and results in a substantial increase of the catalytic activity of the samples investigated.





1990 ◽  
Vol 63 (2) ◽  
pp. 335-339 ◽  
Author(s):  
Akio Nakamura ◽  
Masakatsu Koshinuma ◽  
Kazuo Tajima


Clay Minerals ◽  
1969 ◽  
Vol 8 (2) ◽  
pp. 213-227 ◽  
Author(s):  
W. L. German ◽  
D. A. Harding

Adsorption isotherms for an homologous series of primary aliphatic alcohols from aqueous solution by montmorillonite and kaolinite saturated with either sodium or calcium ions have been determined. The results show that adsorption is a function of chain length and exchangeable cation in the case of the more insoluble alcohols. Exchangeable cation does not affect the adsorption of the soluble alcohols to any significant extent. Adsorption of the longer chain alcohols occurs in voids in the mineral aggregates.



1983 ◽  
Vol 1 (2) ◽  
pp. 159-167 ◽  
Author(s):  
Roger Rymd�n ◽  
Johan Carlfors ◽  
Peter Stilbs




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