Shear-induced structures formed during thixotropic loops in dilute worm-micelle solutions

Delgado, Jorge A.; Castillo, Rolando

doi:10.1016/j.jcis.2007.03.010

Cited by 32 publications

(22 citation statements)

References 22 publications

(65 reference statements)

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“…When other geometries were used, the shape of the flow curves, as well as the stress values were essentially the same. Optical rheometric observations were performed in a homemade transparent Couette rheometer [22]. This transparent Couette rheometer is made of two concentric quartz cylinders (50 mm height).…”

Section: Rheologymentioning

confidence: 99%

“…These images provide a direct evidence of the SIS formation. Observation of SIS is not common, they have been observed in CTAB/NaSal [7,22] in water and in TTAA/NaSal/ isopropanol/H 2 O [20,21]. Scattered light from the sheet of light reveals fluctuations in the dielectric constant due to fluctuations in density and in the nematic order parameter.…”

Section: Observation Of the Shear-induced Structures For The Wm Solutmentioning

confidence: 99%

“…Light scattering experiments [7,20,21] suggest that the shear thickening effect is a shear-induced gelation followed by a fracture of the gel [17]. The sheared-induced gel-like and oriented phase is made of shear-induced structures (SIS) forming large fluctuating domains that coexist with a homogeneous fluid phase containing unstructured aggregates [22]. The portion of the fluid with SIS increases with shear rate [22,23].…”

Section: Introductionmentioning

confidence: 99%

“…The sheared-induced gel-like and oriented phase is made of shear-induced structures (SIS) forming large fluctuating domains that coexist with a homogeneous fluid phase containing unstructured aggregates [22]. The portion of the fluid with SIS increases with shear rate [22,23]. In particular, small angle light scattering has shown the emergence of long rodlike structures along the flow direction, which start to form at the shear-thickening transition [7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A rheological study in the dilute regime of the worm-micelle fluid made of zwitterionic surfactant (TDPS), anionic surfactant (SDS), and brine

López‐Díaz

Sarmiento-Gomez

Garza

et al. 2010

Journal of Colloid and Interface Science

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Section: Rheologymentioning

confidence: 99%

Section: Observation Of the Shear-induced Structures For The Wm Solutmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A rheological study in the dilute regime of the worm-micelle fluid made of zwitterionic surfactant (TDPS), anionic surfactant (SDS), and brine

López‐Díaz

Sarmiento-Gomez

Garza

et al. 2010

Journal of Colloid and Interface Science

Self Cite

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“…Refs. 7-9 and references therein), flow instabilities [10][11][12] , and the emergence of turbid region in various types of flows including Couette flows [13][14][15] , shear flows between parallel plates 16) , capillary flows 17) , flows past a falling sphere 18) , and contraction flows. 19,20) These phenomena are probably relevant to flow-induced gelation of micelles, whereas the relation between these phenomena and flow-induced structures of micelles is not yet clarified.…”

Section: Introductionmentioning

confidence: 99%

Adhesion and Growth Phenomena of Gel-like Materials Induced by Injection of NaSal into Flow of Aqueous Solution of CTAB

Yamamoto

Suzuki

Taniguchi

2012

J. Soc. Rheol., Jpn

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In aqueous solutions of cetyltrimethylammonium bromide (CTAB), wormlike micelles are formed at concentrations above a critical micelle concentration. In addition when counter ion is added to a CTAB solution, wormlike micelles entangle to form networks, which have gel-like structures under some conditions. The present study investigates the formation of gel-like structures when an aqueous solution of sodium salicylate (NaSal) is injected into a flow of a CTAB solution in a circular channel. The condition at which the adhesion of gel to a channel wall occurs is relevant to both the concentration of NaSal and the flow velocity of CTAB solutions. When the concentration is high, the adhesion is observed even at high velocities. Experimental results imply that salicylate ions in injected fluids have an important role in both the adhesion and the growth phenomena of gel-like materials on the channel wall and these phenomena depend on the concentration of NaSal.

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Mechanical Stirring Induces Heteroaggregate Formation and Self‐assembly of Pseudoenantiomeric Oxymethylene Helicene Oligomers in Solution

et al. 2017

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A mixture of pseudoenantiomeric oxymethylene helicene (P)‐pentamers and (M)‐hexamers formed heteroaggregates and self‐assembled as a result of mechanical stirring in solution at 25 °C. No aggregation occurred without stirring, and heteroaggregation was accelerated at high stirring rates. Repeatedly alternating between mechanical stirring and stopping respectively induced and then ceased the heteroaggregation. Sonication also promoted the heteroaggregation, which did not occur at high pressures or during centrifugation. Mechanisms based on friction due to mechanical stirring, which generated local and temporal high‐temperature domains, are considered. It is shown that different methods of mechanical stimulation, namely, stirring and surface contact, induce enantiomeric heteroaggregate formation.

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Shear-induced structures formed during thixotropic loops in dilute worm-micelle solutions

Cited by 32 publications

References 22 publications

A rheological study in the dilute regime of the worm-micelle fluid made of zwitterionic surfactant (TDPS), anionic surfactant (SDS), and brine

A rheological study in the dilute regime of the worm-micelle fluid made of zwitterionic surfactant (TDPS), anionic surfactant (SDS), and brine

Adhesion and Growth Phenomena of Gel-like Materials Induced by Injection of NaSal into Flow of Aqueous Solution of CTAB

Mechanical Stirring Induces Heteroaggregate Formation and Self‐assembly of Pseudoenantiomeric Oxymethylene Helicene Oligomers in Solution

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