Effects of chemical structures of para-halobenzoates on micelle nanostructure,drag reduction and rheological behaviors of dilute CTAC solutions |
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| Authors: | Wu Ge Ellina Kesselman Yeshayahu Talmon David J Hart Jacques L Zakin |
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| Institution: | 1. Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA;2. Department of Chemical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel;3. Department of Chemistry, The Ohio State University, Columbus, OH 43210, USA |
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| Abstract: | Counterion chemical structure and counterion to cationic surfactant molar ratio, ξ, control counterion binding, micelle nanostructures, drag reduction (DR) effectiveness and rheological behavior of quaternary ammonium surfactant systems. The effects of chemical structures of four sodium para-halobenzoate (F, Cl, Br, I) counterions with different ξ values on these properties were compared for dilute solutions of cetyltrimethylammonium chloride (CTAC). Counterion binding was determined by zeta-potential and 1H NMR measurements. Nanostructures were determined by 1H NMR and cryo-TEM imaging. Nanostructures, drag reduction effectiveness measured over a range of temperatures and Reynolds numbers, shear viscosities and first normal stress differences N1 were related to the chemical structures of the four counterions and their molar ratios to CTAC. |
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| Keywords: | Surfactant drag reduction Threadlike micelles Counterion binding Rheology Zeta-potential 1H NMR Cryo-TEM |
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