The rheology of aqueous solutions of ethyl hydroxy-ethyl cellulose (EHEC) and its hydrophobically modified analogue (hmEHEC): extensional flow response in capillary break-up, jetting (ROJER) and in a cross-slot extensional rheometer

Soft Matter
Vivek SharmaGareth H McKinley

Abstract

Cellulose derivatives containing associating hydrophobic groups along their hydrophilic backbone are used as rheology modifiers in the formulation of water-based spray paints, medicinal sprays, cosmetics and printable inks. Jetting and spraying applications of these materials involve progressive thinning and break-up of a fluid column or sheet into drops. Strong extensional kinematics develop in the thinning fluid neck. In viscous Newtonian fluids, inertial and viscous stresses oppose the surface tension-driven instability. In aqueous solutions of polymers such as Ethyl Hydroxy-Ethyl Cellulose (EHEC), chain elongation provides additional elastic stresses that can delay the capillary-driven pinch-off, influencing the sprayability or jettability of the complex fluid. In this study, we quantify the transient response of thinning filaments of cellulose ether solutions to extensional flows in a Capillary Break-up Extensional Rheometer (CaBER) and in a forced jet undergoing break-up using Rayleigh Ohnesorge Jetting Extensional Rheometry (ROJER). We also characterize the steady state molecular deformations using measurements of the flow-induced birefringence and excess pressure drop in an extensional stagnation point flow using a Cros...Continue Reading

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Citations

Apr 22, 2016·Biomicrofluidics·S J Haward
Oct 24, 2018·Soft Matter·Andreas KoeppelChris Holland
Apr 14, 2019·Proceedings of the National Academy of Sciences of the United States of America·Jelena Dinic, Vivek Sharma
Jul 21, 2020·Journal of Colloid and Interface Science·Yu-Jiun LinNorman J Wagner
Mar 20, 2021·International Journal of Biological Macromolecules·María BorregoJosé M Franco
May 5, 2021·Soft Matter·Leidy Nallely JimenezVivek Sharma
Jun 3, 2021·Soft Matter·Carina D V Martínez NarváezVivek Sharma
Jul 4, 2021·Dysphagia·Crispulo GallegosEdmundo Brito-de la Fuente
Jun 5, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Yiran Zhang, Vivek Sharma
Oct 9, 2021·Soft Matter·Kathleen T LauserMichelle A Calabrese

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