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Title: Synergistic Influence of pH and Temperature on Rheological Behavior of Adhesive Emulsions Stabilized with Micelle Dispersion of an Anionic Surfactant
Authors: Kundu P.
Kumar, Vimal
Scales P.J.
Mishra I.M.
Published in: Journal of Surfactants and Detergents
Abstract: The influence of emulsion pH and temperature on the rheological behavior of adhesive oil-in-water (o/w) emulsions stabilized with an anionic surfactant (sodium dodecyl benzene sulfonate, SDBS) was studied. The flow properties of emulsions as a complex fluid were investigated using steady and dynamic rheometry for characterization of non-Newtonian behavior. Emulsion pH was varied from 2 to 12 and temperature was varied from 20 to 50 °C, respectively. The influences of the above-mentioned variables on the rheology of o/w emulsion were studied using steady-shear and dynamic oscillatory experiments. Various viscosity models (2, 3, and 4 parameter rheological model) were used to predict the rheological parameters. An increase in the pH of the emulsion led to an increase in the emulsion stability, viscosity, and viscoelastic properties (G?, G?, ?*, and tan ?), and a decrease in the mean droplet size of the emulsion. A decrease in the temperature yields higher values of steady-shear viscosity and viscoelastic properties upon a decrease in droplet size. Emulsions were characterized as flocculated structured liquid exhibiting a characteristic crossover frequency (?*) within the range of angular frequency studied in oscillatory measurements. Overall, emulsions exhibited non-Newtonian shear-thinning behavior and the synergy of pH and temperature significantly influences the emulsion rheology. © 2018 AOCS
Citation: Journal of Surfactants and Detergents (2019), 22(2): 301-313
Issue Date: 2019
Publisher: John Wiley and Sons Inc.
Keywords: Anionic surfactant
Non-Newtonian fluids
ISSN: 10973958
Author Scopus IDs: 55835249800
Author Affiliations: Kundu, P., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Kumar, V., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Scales, P.J., Department of Chemical and Biomolecular Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
Mishra, I.M., Department of Chemical Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Dhanbad, Jharkhand 826004, India
Funding Details: Acknowledgements Authors gratefully acknowledge the financial support from the Indian Institute of Chemical Engineers (IIChE), India (research project-grant IIC-734-CHD), Science & Engineering Research Board (SERB), and Department of Science & Technology, Government of India (R&D project grant SER-924-CHD) for the present work.
Corresponding Author: Kumar, V.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email:
Appears in Collections:Journal Publications [CH]

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