Abstract
Unusual temperature gaps have previously been observed in the turbulent drag reduction effectiveness of Dobon and Habon cationic surfactant systems containing two anionic counterions of different binding strengths. Here, we report drag reduction data for a cationic surfactant with a mixture of dodecyl sulfate and tosylate counterions showing a temperature gap. Cryo-TEM images of nanostructures at different temperatures for this system support an explanation for this gap, based on the counterions’ relative binding strengths.
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Acknowledgements
Support for Ying Zhang, Yunying Qi, and Lu-Chien Chou was provided by The Ohio State University. The cryo-TEM was done at the Technion’s Laboratory for Electron Microscopy of Soft Materials, supported by the Technion Russell Bertie Nanotechnology Institute (RBNI).
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Zhang, Y., Qi, Y., Schmidt, J. et al. Unusual temperature gap in turbulent drag reduction of cationic surfactants with mixed counterions. Rheol Acta 56, 409–414 (2017). https://doi.org/10.1007/s00397-017-0996-1
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DOI: https://doi.org/10.1007/s00397-017-0996-1