Abstract
Abstract ESR measurements of Mn2+ ions in aqueous manganese dodecyl sulfate (Mn(DS)2) solutions with or without 0.05% poly(N-vinylpyrrolidone)(PVP) were carried out at 30 °C. The dependences of linewidths and of absorption intensities on the Mn(DS)2 concentration in (Mn(DS)2+0.05% PVP) solutions changed abruptly at a concentration where a PVP–Mn(DS)2 complex begins to form. The same dependence in Mn(DS)2 solutions was found around the CMC of Mn(DS)2 in water. From the quantitative analysis of the data obtained, it was concluded that the Mn(DS)2 molecules in the complex form a nearly micelle-like aggregate, and that most of Mn2+ ions bound onto the micelle-like aggregate or the Mn(DS)2 micelle exist in the Stern layer. In addition, the PVP concentration dependence of the similar quantities in (Mn(DS)2+PVP) solutions with a constant Mn(DS)2 concentration suggested that the polymer-surfactant complex changes its structure at higher PVP concentrations.
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