TITLE:
Determination of Critical Micel Concentration of PEG-10 Tallow Propane Amine: Effects of Salt and pH
AUTHORS:
Nese Ataci, Ayfer Sarac
KEYWORDS:
Cationic Surfactant; PEG Groups; CMC; Surface Tension and Electrical Conductivity; NaCl; pH
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.5 No.1,
January
10,
2014
ABSTRACT: Most applications of surfactants depend on formation
and characteristics of micelle. In this study we measured critical micelle
concentration (CMC) of cationic surfactant N, N’,
N’-polyethylene (10)-N tallow-1, 3-di amine propane (PEG-10 tallow) in aqua
solution by using electrical conductivity and surface tension methods. The
CMC value of PEG-10 tallow with two different methods was found very close to 1.40 × 10?3 M with electrical conductivity, and 1.41 × 10?3 M with surface tension. It also investigated the effect of inorganic salt
(NaCl) and pH on micellization of cationic surfactant PEG-10 tallow. With
increasing addition of NaCl, formation of micelle structure resulted in a
higher CMC. However, at low salt concentrations smaller CMC value was observed comparing
the critical micelle concentration of individual PEG-10 tallow. When it comes
to the effect of changing pH in CMC of the PEG-10 tallow , it was clearly found
that micelle formation or CMC of surfactant was independent on alkaline
pH (between 6 and 10), but it was dependent on acidic
pH (below 5).