Micellar catalysed hydrolysis of amides. 4-Nitroacetanilide in hexadecyl-trimethylammonium bromide

1980 ◽  
Vol 33 (4) ◽  
pp. 747 ◽  
Author(s):  
CJ O'Conner ◽  
A Tan
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Competitive Binding ◽  
Micellar Catalysis ◽  
Hexadecyltrimethylammonium Bromide ◽  
Surface Tension Measurement ◽  
Hexadecyl Trimethylammonium Bromide ◽  
Hydrolysis Of

Surface tension measurement of the critical micelle concentration, CMC, of cationic hexadecyltrimethylammonium bromide, ctab, shows a significant increase on addition of very small amounts of 4- nitroacetanilide. At concentrations above the CMC, ctab catalyses the hydrolysis of 4-nitroacetanilide.The micellar catalysis is inhibited by added salts, especially those of arenesulfonates and bulky carboxylate ions. The kinetics have been analysed in terms of competitive binding of the substrate and the inhibitor to the micelle.

Micellar catalysed hydrolysis of amides. II. N-Ethyl-4-nitrotrifluoroacetanilide in functional and non-functional micelles

1981 ◽  
Vol 34 (8) ◽  
pp. 1603 ◽  
Author(s):  
CJ O'Conner ◽  
AJ Porter
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Rate Constants ◽  
Surfactant Concentration ◽  
Hexadecyltrimethylammonium Bromide ◽  
Dimethyl Ammonium Chloride ◽  
Methylammonium Chloride ◽  
Dimethyl Ammonium ◽  
Hydrolysis Of ◽  
Functional Detergents

The reactivity of N-ethyl-4-nitrotrifluoroacetanilide has been examined in the presence of a non-functional detergent (n- hexadecyltrimethylammonium bromide) and three functional detergents, n-hexadecyl(2-hydroxyethyl)dimethylammoniumchloride, n- hexadecyl(imidazol-4-ylmethyl)dimethyl-ammonium chloride and n-hexadecyl(2-hydroxyethyl)(imidazol-4-ylmethyl)methylammonium chloride, at 293.5 K and in borate buffer (1.3 × 10-3 mol dm-3, pH 9.0). The variation of the rate constants for the overall reaction with surfactant concentration has been analysed in terms of the reactant concentrations and rate constants in each pseudophase, the micelle binding constant and the critical micelle concentration, CMC. Surface tension measurements have been made on solutions of these surfactants. The values of CMC have been measured with, and without, the addition of a kinetic concentration of amide and the results compared with those from the kinetic analysis.

scholarly journals Micellization behaviour of sodium dodecyl sulphate in presence and absence of sodium sulphate and zinc sulphate in distilled water by surface tension measurement

BIBECHANA ◽  
2014 ◽  
Vol 11 ◽  
pp. 79-85 ◽  
Author(s):  
Kuber Limbu ◽  
Sujit Kumar Shah ◽  
Ajaya Bhattarai
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Sodium Dodecyl Sulphate ◽  
Room Temperature ◽  
Zinc Sulphate ◽  
Sodium Dodecyl ◽  
Sodium Sulphate ◽  
Distilled Water ◽  
Surface Tension Measurement ◽  
Weight Method

The accurate measurements of surface tension of sodium dodecyl sulphate (SDS) in distilled water and in presence of 0.01M Na2SO4 and 0.01M ZnSO4 at room temperature were reported by drop weight method using a stalagmometer. The critical micelle concentration (cmc) of sodium dodecyl sulphate (SDS) in distilled water was obtained higher than in presence of Na2SO4 and ZnSO4. The decrease of cmc of sodium dodecyl sulphate in the presence of salts has been discussed. DOI: http://dx.doi.org/10.3126/bibechana.v11i0.10383 BIBECHANA 11(1) (2014) 79-85

The critical micelle concentration of Teric X10 by the small rod-in-free-surface method of surface tension measurement

1993 ◽  
Vol 74 (2-3) ◽  
pp. 287-292 ◽  
Author(s):  
Christopher J. Lyons ◽  
Brian P. Moore ◽  
Colan D. Distel ◽  
Enn Elbing ◽  
Bruce A.W. Coller ◽  
...  
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Critical Micelle Concentration ◽  
Surface Tension Measurement ◽  
Surface Method

Surface Activity Research of Cationic Gemini Surfactants

2013 ◽  
Vol 690-693 ◽  
pp. 2076-2080
Author(s):  
Zhen Zhong Fan ◽  
Lan Lan Li ◽  
Li Feng Zhang ◽  
Qing Wang Liu
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Surface Activity ◽  
Surfactant Concentration ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Ph Value ◽  
Inorganic Salts ◽  
Cationic Gemini Surfactant ◽  
Cationic Gemini Surfactants

Cationic Gemini surfactant concentration, the inorganic salts added and the pH value of surface tension obtained cationic gemini surfactant critical micelle concentration is 0.4mmol / L;by adding three kinds of inorganic salts NaCl, MgCl2, and Na2SO4 ,which Na2SO4 has the greatest impact on surface tension, followed by MgCl2.The surface minimum tension of the pH ranged from 9 to 11 , indicating that the surface activity of cationic gemini surfactants achieved the highest.

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