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- Torres, Miguel F. (author)
Effect of ionic strength on the rheological behavior of aqueous cetyltrimethylammonium p-toluene sulfonate solutions
- Article/chapterEnglish2007
Publisher, publication year, extent ...
- Elsevier BV,2007
Numbers
- LIBRIS-ID:oai:lup.lub.lu.se:083b5844-bc31-4075-bea2-e54ab59edbd4
- https://lup.lub.lu.se/record/676589URI
- https://doi.org/10.1016/j.jcis.2006.11.002DOI
Supplementary language notes
- Language:English
- Summary in:English
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- SwePubSwePub
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Notes
- The influence of ionic environment on the rheological properties of aqueous cetyltrimethylammonium p-toluene sulfonate (CTAT) solutions has been studied under three different flow fields: simple shear, opposed-jets flow and porous media flow. Emphasis was placed in the experiments on a range of CTAT concentration in which wormlike micelles were formed. It is known that these solutions exhibit shear thickening in the semi-dilute regime, which has been explained in terms of the formation of shear-induced, cooperative structures involving wormlike micelles. In simple shear flow, the zero shear viscosity exhibits first an increase with salt addition followed by a decrease, while the critical shear rate for shear thickening increases sharply at low salt contents and tends to saturate at relatively high ionic strengths. The results are explained in terms of a competition between micellar growth induced by salt addition and changes in micellar flexibility caused by ionic screening effects. Dynamic light scattering results indicate that micelles grow rapidly upon salt addition but eventually achieve a constant size under static conditions. These observations suggest that the wormlike micelles continuously grow with salt addition, but, as they become more flexible due to electrostatic screening, the wormlike coils tend to adopt a more compact conformation. The trends observed in the apparent viscosities measured in porous media flows seem to confirm these hypotheses-but viscosity increases in the shear thickening region-and are magnified by micelle deformation induced by the elongational nature of the local flow in the pores. In opposed-jets flow, the solutions have a behavior that is close to Newtonian, which suggests that the range of strain rates employed makes the flow strong enough to destroy or prevent the formation of cooperative micellar structures. (c) 2006 Published by Elsevier Inc.
Subject headings and genre
- NATURVETENSKAP Kemi Fysikalisk kemi hsv//swe
- NATURAL SCIENCES Chemical Sciences Physical Chemistry hsv//eng
- porous media flow
- extensional flow
- CTAT
- shear-thickening
Added entries (persons, corporate bodies, meetings, titles ...)
- Gonzalez, Juan M. (author)
- Rojas, Mario R. (author)
- Muller, Alejandro J. (author)
- Saez, A. Eduardo (author)
- Löf, DavidLund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)fkem-dlo (author)
- Schillén, KarinLund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)fk1-ksc (author)
- Fysikalisk kemiEnheten för fysikalisk och teoretisk kemi (creator_code:org_t)
Related titles
- In:Journal of Colloid and Interface Science: Elsevier BV307:1, s. 221-2281095-71030021-9797
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