Interactions in multicomponent systems containing surfactants. System silver iodide — methylene blue and sodium dodecyl sulphate |
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| Authors: | V Tomašić S Popović N Kallay |
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| Institution: | (1) Present address: Ru er Bo kovi Institute, Zagreb;(2) Department of Physics, Faculty of Science, University of Zagreb, Yugoslavia;(3) Department of Chemistry, Faculty of Science, University of Zagreb, Croatia, Yugoslavia;(4) Present address: Faculty of Agricultural Science, University of Zagreb, Yugoslavia |
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| Abstract: | The precipitation and dissolution of AgI in the presence of methylene blue (MB · Cl) and sodium dodecyl sulphate (NaDS) was followed by X-ray diffraction analysis.At high MB · Cl concentration, the absence of AgI precipitates was observed, which is explained by considering the redox process MB+ + 2I–  MB– + I2. The decrease in I– concentration causes dissolution or inhibition of growth of solid AgI which is significant at relatively high MB · Cl concentrations. The addition of NaDS causes the disappearance of these effects, which is explained by the incorporation of MB in NaDS micelles.These explanations are supported by the potentiometric measurements using Ag/Ag2S and Pt electrodes. |
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| Keywords: | Precipitation of AgI in the presence of MB · Cl and NaDS X-ray diffraction phase analysis crystallite size |
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