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).
Highlights
Surfactants or surface active agents have a wide range of applications in industries, agriculture, textile, detergent, food, cosmetics and the drug or pharmaceutical [1,2]
The micelle forming concentration of PEG-10 tallow cationic surfactant was followed by measuring conductivity and surface tension in aqueous medium
The typical curve expected for such single tail cationic surfactant systems was obtained in the given figures.critical micelle concentration (CMC) was overlap for surface tension and conductivity methods
Summary
Surfactants or surface active agents have a wide range of applications in industries, agriculture, textile, detergent, food, cosmetics and the drug or pharmaceutical [1,2]. Surfactants consist of a long non-polar or hydrophobic such as single or double bonds, saturated and unsaturated hydrocarbon tail and a polar or hydrophilic with ionic, nonionic or zwitterion head groups [3]. Cationic surfactants are one of the major types of the ionic surface active agents with positively charged hydrophilic head group and a hydrophobic tail group. Antibacterial, antistatic, corrosion inhibitory, dispersants, emulsifying, wetting and solubilizing agent’s properties of cationic surfactants are well known [1,4,5]. Many cationic surfactants showed interesting properties, for example; cetylpyridinium chloride was a single-chain cationic surfactant with well-known antibacterial properties and in the presence of cetylpyridinium chloride strong complexes formed between nucleic acids and cationic liposoms for the transfection of plasmid into the cell. Doublechain cationic surfactant dimethyldialkylammonium bromide has shown immune adjuvant properties. A cationic gemini surfactant dodecyltrimetylammonium bromide (DTABr), and tetradecyltrimetylammonium bromide (TTABr) have been used for determining interaction between surfactant and DNA [8,10,11]
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