Concentration Dependence of Surface Tension for Very Dilute Aqueous Solutions of Organic Nonelectrolytes

2004 ◽  
Vol 49 (4) ◽  
pp. 1003-1007 ◽  
Author(s):  
Kateřina Habrdová ◽  
Štěpán Hovorka ◽  
Lidmila Bartovská
Keyword(s):  
Surface Tension ◽  
Aqueous Solutions ◽  
Concentration Dependence ◽  
Dilute Aqueous Solutions

Preparation and Properties of Amide Surfactants

2012 ◽  
Vol 550-553 ◽  
pp. 99-102
Author(s):  
Bao Cai Xu ◽  
Gui Ju Zhang ◽  
Yun Xia Li ◽  
Lu Cui
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Aqueous Solutions ◽  
Surface Activity ◽  
Surface Tensions ◽  
Equilibrium Surface ◽  
Minimum Surface Tension ◽  
Dilute Aqueous Solutions ◽  
Lipophilic Groups ◽  
Long Chain

Amide surfactants have modified structures with lipophilic groups connecting hydrophilic groups through amido bond. The preparation of three families of amide surfactants including long chain N-acyl sarcosinates, amidopropyl dimethyl hydroxypropyl sulfobetaines and lauryl amidopropyl trimethyl ammoniums were discussed. The study of the surface activity of these compounds by measuring the equilibrium surface tensions of their dilute aqueous solutions were described. The minimum surface tension and the critical micelle concentration values of these compounds are given.

Heat capacities and volumes of dilute aqueous solutions of 1,3-dioxane and trioxane

1981 ◽  
Vol 59 (17) ◽  
pp. 2599-2600 ◽  
Author(s):  
Gérald Perron ◽  
Jacques E. Desnoyers
Keyword(s):  
Aqueous Solutions ◽  
Concentration Dependence ◽  
Infinite Dilution ◽  
Unit Volume ◽  
Heat Capacities ◽  
Cyclic Ethers ◽  
Group Additivity ◽  
Simple Correlation ◽  
Dilute Aqueous Solutions ◽  
Molal Volumes

The densities and heat capacities per unit volume of 1,3-dioxane and trioxane were measured in water at 25 °C in the concentration range 0.1 to 1 mol kg−1. Apparent molal volumes [Formula: see text] and [Formula: see text] heat capacities were derived. The infinite dilution [Formula: see text] shows excellent group additivity with other cyclic ethers in water but the additivity is less satisfactory for[Formula: see text]. No simple correlation can be made for the concentration dependence of these functions.

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