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Abstract:
The viscoelastic wormlike micellar solutions formed by the carboxylate gemini surfactant, O,O′-bis(sodium 2-dodecylcarboxylate)-p-dibenzenediol (referred to as C12φ2C12), have been investigated by steady-state and dynamic frequency-sweep rheological techniques. Another system using its homologue, O,O′-bis(sodium 2-dodecylcarboxylate) -p-benzenediol (C12φC12), was also examined for comparison. Both C12φ2C12 and C 12φC12 formed wormlike micelles without any additives. The C* corresponding to the onset of the semi-dilute regime was 48 mmol L-1 for C12φ2C12 and 160 mmol L-1 for C12φC12, respectively, showing the considerably high ability and efficiency of C12φ 2C12 in forming wormlike micelles. The wormlike micelles started to entangle with each other at 60 mmol L-1 for C 12φ2C12 and 300 mmol L-1 for C12φC12. The average length of the C 12φ2C12 wormlike micelles was estimated to be about 1.0-1.9 μm, significantly longer than the C12φC 12 ones. The solution viscosity of C12φ 2C12 at 200 mmol L-1 reached 613 Pa s, much higher than 24.2 Pa s for C12φC12 at 500 mmol L -1. The mechanisms of forming wormlike micelles in both cases were revealed by dynamic light scattering measurements. Differently from the normal micellar growth that C12φC12 displayed, C 12φ2C12 was found to form large network-like aggregates at very low concentrations. These aggregates could more conveniently transform into threadlike (wormlike) micelles by continuously increasing the concentration of C12φ2C12, from which a new approach was realised for highly viscoelastic anionic wormlike micellar solutions. © The Royal Society of Chemistry 2013.
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Soft Matter
ISSN: 1744-683X
Year: 2013
Issue: 28
Volume: 9
Page: 6532-6539
4 . 1 5 1
JCR@2013
2 . 9 0 0
JCR@2023
JCR Journal Grade:1
CAS Journal Grade:1
Cited Count:
SCOPUS Cited Count: 26
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
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30 Days PV: 0
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