In this work, a new Gemini cationic surfactant was synthesized and characterized, and the interface properties, such as critical micelle concentration
(CMC) and foam stability, of the new cationic surfactants will be investigated.
The critical micelle concentration
(cmc) of ADMDHAC and its surface tension at cmc (cmc) in aqueous solution at 25 C were shown in Table-2.
As the polymer is saturated with surfactant, the surfactant unimer concentration and the activity start to increase again and there is a lowering of the surface tension until the unimer concentration reaches the critical micelle concentration
, after which the surface tension is again constant as micelles form.
Critical micelle concentration
, (CMC) determined from the surface tension data was found to decrease with the increase of temperature as well as with the increase in hydrophobic block length for both the copolymers investigated.
From the inflection point of the plot, the critical micelle concentration
It reduces the critical micelle concentration
(CMC) of primary surfactants and lowers surface tension.
The concentration at which the micelle formation commences is designated as critical micelle concentration
The concentration of surfactants used ranges from below to above their critical micelle concentration
By increasing the reactor temperature the free surfactant concentration reduces more quickly, therefore its concentration reaches below the critical micelle concentration
The model claimed surfactants above the critical micelle concentration
(CMC) have the same monomer penetration.
It can be seen that, after the initial sharp decline in particle size, a quasi-equilibrium state is attained beyond a critical compatibilizer concentration called critical micelle concentration
, CMC owing to micelle formation of the excess compatibilizer in one of the phases as well as the change in its molecular state at interface (5 wt% of compatibilizer in the present case).
The concentration, above which micelle formation becomes appreciable, is termed the critical micelle concentration