Monitoring the Transition from Spherical to Polymer-like Surfactant Micelles Using Small-Angle X-Ray Scattering†
Dr. Grethe Vestergaard Jensen
Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C (Denmark)
Search for more papers by this authorCorresponding Author
Dr. Reidar Lund
Dept. of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo (Norway)
Reidar Lund, Dept. of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo (Norway)
Jan Skov Pedersen, Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C (Denmark)
Search for more papers by this authorDr. Jérémie Gummel
European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38043 Grenoble Cedex (France)
Search for more papers by this authorDr. Theyencheri Narayanan
European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38043 Grenoble Cedex (France)
Search for more papers by this authorCorresponding Author
Prof. Jan Skov Pedersen
Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C (Denmark)
Reidar Lund, Dept. of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo (Norway)
Jan Skov Pedersen, Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C (Denmark)
Search for more papers by this authorDr. Grethe Vestergaard Jensen
Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C (Denmark)
Search for more papers by this authorCorresponding Author
Dr. Reidar Lund
Dept. of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo (Norway)
Reidar Lund, Dept. of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo (Norway)
Jan Skov Pedersen, Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C (Denmark)
Search for more papers by this authorDr. Jérémie Gummel
European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38043 Grenoble Cedex (France)
Search for more papers by this authorDr. Theyencheri Narayanan
European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38043 Grenoble Cedex (France)
Search for more papers by this authorCorresponding Author
Prof. Jan Skov Pedersen
Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C (Denmark)
Reidar Lund, Dept. of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo (Norway)
Jan Skov Pedersen, Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000 Aarhus C (Denmark)
Search for more papers by this authorWe are indebted to the European Synchrotron Radiation Facility (ESRF) for providing beam time. R.L. greatly acknowledges grants from the Norwegian Research Council, under the SYNKNOYT program (218411 and 228573).
Abstract
Despite over a century of modern surfactant science, the kinetic pathways of morphological transitions in micellar systems are still not well understood. This is mainly as a result of the lack of sufficiently fast methods that can capture the structural changes of such transitions. Herein, a simple surfactant system consisting of sodium dodecyl sulfate (SDS) in aqueous NaCl solutions is investigated. Combining synchrotron radiation small-angle X-ray scattering (SAXS) with fast stopped-flow mixing schemes allows monitoring the process where polymer-like micelles are formed from globular micelles when the salt concentration is suddenly increased. The results show that “worm-like” micelles are formed by fusion of globular micelles and short cylinders in a fashion that bears similarities to a step-like polymerization process.
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