Related Experiment Video
Updated: Jul 13, 2026

Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
Published on: December 20, 2016
Ammonium ionic liquid as modulator of the critical micelle concentration of ammonium surfactant at aqueous solution:
Hocine Sifaoui1, Katarzyna Lugowska, Urszula Domańska
1Laboratoire de Thermodynamique et de Modélisation Moléculaire, Faculté de Chimie, USTHB, BP 32 El-Alia, 16111 Bab-Ezzouar, Alger, Algérie.
Abstract:
We report measurements of self aggregation in aqueous solution of an ionic liquid (IL), didecyl-dimethylammonium nitrate ([DDA][NO(3)]) and a surfactant hexadecyl-trimethylammonium bromide (CTAB) and of mixtures of these two salts. The electrical conductivity and dynamic light scattering (DLS) measurements were used for the characterization of the aggregation process. The conductivity measurements were performed at three temperatures. The critical micelle concentration (CMC) was determined at different temperatures and at different ratio of two salts. The effect of IL on the micellization of CTAB has been discussed. Our results suggest that organized structures formed by CTAB and [DDA][NO(3)] self assembly in domains of several hundred nanometers size. The micellar solubility of the salicylic acid in mixed salt aqueous solutions was determined to probe the physical properties of these assemblies. We have observed, that the micellar solubility enhancement was only slightly influenced by the nature of micelles present in aqueous solution. This proves that salicylic acid solubilization is enthalpy driven.
Related Concept Videos
Micelles
Surface Active Agents
Common Ion Effect
Basicity of Aliphatic Amines
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
Qualitative Analysis
For instance, group IV...
Basicity of Heterocyclic Aromatic Amines

