scholarly journals Solubilisation of (+)-Usnic Acid in Aqueous Micellar Solutions of Gemini and Heterogemini Surfactants and their Equimolar Mixture

2012 ◽  
Vol 59 (2) ◽  
pp. 36-43 ◽  
Author(s):  
M. Lukáč ◽  
I. Prokipčák ◽  
I. Lacko ◽  
F. Devínsky

AbstractThe solubilisation of natural compound, (+)-usnic acid, in micellar solutions of gemini (N,N’-didecyl-N,N,N’,N’-tetramethylethane-1,2-diyldiammonium dibromide) and heterogemini (decyl 2-[decyl(dimethyl)ammonio]ethylphosphate) surfactants and their equimolar mixture has been studied. The highest solubility was found for gemini surfactant. The relationship between synergism in surface properties of mixture of surfactants and their solubilisation properties is also discussed.

Author(s):  
Alexander Vasilievich Dvernik

The article studies different shell constructions of mid-water trawls and their properties. The problem settled is suggested to be solved taking into account real geometric interrelations between spacious and surface properties of cone shells. The author suggests to accept a so-called geometric quality coefficient as a criterion of the properties of a conical shell, which represents the ratio of the shell to the area of its side surface and by analogy to use it to the shell of the trawl. The relationship between the trawl dimensions and geometric quality coefficient have been studied. Comparing these figures with the actual characteristics of trawls showed good convergence. According to the results of theoretic analysis and parameters calculation, trawl large-size shells will always have advantages in geometric characteristics over mid-size and, especially, small-size shells. The results of the analysis can be used for approximate calculations of the parameters of the trawl and justification of ways to improve the performance of existing mid-water trawls.


1990 ◽  
Vol 52 (1) ◽  
pp. 157-163 ◽  
Author(s):  
Thomas Wolff ◽  
Susanne Weber ◽  
Günther Von Bünau

2011 ◽  
Vol 115 (29) ◽  
pp. 8242-8247 ◽  
Author(s):  
Ye Zhang ◽  
Y. A. Yousef ◽  
Heng Li ◽  
T. B. Melø ◽  
K. Razi Naqvi

2004 ◽  
Vol 40 (10) ◽  
pp. 441-445
Author(s):  
Yohji NAKATSUJI

1982 ◽  
pp. 907-919 ◽  
Author(s):  
Jan Christer Eriksson ◽  
Ulf Henriksson ◽  
Tomas Klason ◽  
Lars Ödberg

2012 ◽  
Vol 74 (5) ◽  
pp. 564-568 ◽  
Author(s):  
N. N. Kochurova ◽  
E. R. Airapetova ◽  
N. G. Abdulin ◽  
O. P. Korotkikh ◽  
A. V. Lezov ◽  
...  

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