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    Aggregation behavior and intermolecular interaction of binary surfactant mixtures based on cationic Geminis and nonionic surfactants
    (Springer, 2015) Akbas, Halide; Kasapoglu, Sinem; Boz, Mesut
    The Gemini surfactants of type alkylediyl-alpha-omega-bis(alkyldimethylammonium) dibromide with different alkyl groups containing m carbon atoms and an ethanediyl spacer, referred as m-2-m [C (m) H2m + 1(CH2)(2) N+(CH2)(2) N+(CH2)(2) C (m) H2m + 1, 2Br(-)] (m = 12 and 16), have been synthesized, purified, and characterized in our laboratory. The interactions between cationic Geminis and nonionic surfactants polyoxyethylene (23) lauryl ether (Brij35) and polyoxyethyleneoctyl phenyl ether (TX-100) have been studied by conductivity and steady-state fluorescence quenching techniques at a certain micellar concentration range and certain temperature. Rubingh's theory is used to evaluate the micellar interaction parameters (beta) for the mixed systems. It has been observed that mixed micelle formation in all the binary mixtures exhibited negative synergism (antagonism) or ideal behavior due to positive beta values. It was observed that contribution of conventional surfactants was always more than that of the Geminis. By using the ratio of peak intensities, micro-polarity, dielectric constant (D), and binding constant (K (sv)) of mixed systems have been found.
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    Experimental Investigation of Cationic Gemini Surfactants: Self-Assembly, Corrosion Inhibition, Foaming and Dye Solubilization Properties
    (Wiley-V C H Verlag Gmbh, 2023) Kasapoglu, Sinem; Batigoc, Cigdem; Boz, Mesut; Tetik, Ovul
    In this study, two cationic gemini surfactants 12-3-12 and 12-3(OH)-12 were synthesized in our labrotory. The critical micelle concentration (CMC) values of synthesized surfactants were determined by conductivity measurements. The aggregation number (Nagg) of micelles was calculated using the pyrene probe fluorescence method. It was been investigated the corrosion effect of cationic gemini surfactants were denoted as 12-3-12 and 12-3(OH)-12 for carbon steel in 1 M HCl. The inhibition effect was investigated using weight loss, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) and scanning electron microscopy (SEM) techniques. It has been determined that both surfactants showed the best inhibitory effect at low concentrations. The foaming capacity (FC) and the foam stability (FS) of gemini surfactants were studied by measuring the foam volume for 0.5 % (w/v) surfactant solutions and it was observed that the foaming properties of 12-3(OH)-12 gemini surfactant were better. The solubility capability of both surfactants was tested with the water-insoluble dye Sudan Red B and it was observed that the solubility increased significantly over the CMC value of the cationic gemini surfactants. Finally, the corrosion effect, foam capacity and foam stability and effects on paint solubility of the synthesized surfactants were obtained at very low concentrations.