Gemini Surfactants: An Investigation in Drag-Reducing Potential
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Date
2015-05
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The Ohio State University
Abstract
Drag reduction is an important research area. Due to their unique properties and structure, gemini surfactants are good candidates for drag-reducing additives. This project explored the properties of two different types of gemini surfactants, 12-2-12 and 18-2-18. Various concentrations of surfactants between 0.5-2.5mM with NaSal ratios of 1/10, 1/5, and 1/2 were tested on a cone and plate rheometer to test for viscoelastic properties that may correlate to drag-reducing properties. The 18-2-18 solutions did not exhibit any significant viscoelasticity, and the stability of the solutions is a concern when exploring higher concentrations and counterion ratios. The 12-2-12 solutions exhibited significant viscoelasticity at concentrations of 2.0mM and 2.5mM with NaSal ratio of 1/2. Further studies of this surfactant with higher counterion concentrations are recommended.
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Keywords
gemini surfactants, drag reduction, surfactant, district heating applications