Time-Resolved Small-Angle Neutron Scattering Study of Shear-Thickening Surfactant Solutions after the Cessation of Flow

Oda, Reïko; Weber, V.; Lindner, Peter; Pine, David J.; Mendes, Eduardo; Schosseler, F.

doi:10.1021/la9913811

Cited by 36 publications

(55 citation statements)

References 35 publications

(73 reference statements)

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“…The results reported above confirm previous SANS results showing the existence of very long relaxation times for a sheared system to reach the equilibrium [50]. An important information is that one observes the same relaxation in two different experiments, one involving a concentration jump (without significant shearing) the other a shearing of a system at equilibrium.…”

Section: Micellar Structure In the Vicinity Of φ *supporting

confidence: 90%

“…In particular, the systems exhibit in the same concentration range a shear thickening effect occurring beyond a critical shear and accompanied by a shear-induced birefringence [50,[62][63][64][65][66][67][68][69]. This phenomenon is ascribed to a shear-induced transition from a solution of unaligned wormlike micelles to a solution containing two new coexisting morphologies: individual micelles and a highly interconnected network which contains most of the surfactant.…”

Section: Micellar Structure In the Vicinity Of φ *mentioning

confidence: 94%

“…After the cessation of shear the system relaxes again with about the same time constant. Relaxation processes with characteristic times of the order of several hours have been observed recently by Small Angle Neutron Scattering (SANS) after shearing solutions of a dimeric surfactant in the same concentration regime [50].…”

Section: Relaxational Behavior In the Vicinity Of φ *mentioning

confidence: 95%

See 2 more Smart Citations

Scattering properties of salt-free wormlike micellar solutions

Bellour

Knaebel

Munch

et al. 2000

The European Physical Journal E

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Static and dynamic light scattering and conductivity experiments were carried out on salt-free aqueous micellar solutions of cetyltrimethylammonium n-hexane sulfonate (CTAC6SO3) and cetyltrimethylammonium n-heptane sulfonate (CTAC7SO3) as a function of surfactant concentration. This study confirms the analogy between the behavior in the semi-dilute regime of elongated micellar systems and "classical" polyelectrolyte solutions. Time-resolved scattering experiments performed after a variation of concentration from about twice the overlap volume fraction Φ * to less than half of it revealed the existence of a structural relaxation with a characteristic time of several hours. PACS. 36.20.-r Macromolecules and polymer molecules -61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling -82.70.-y Disperse systems

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Section: Micellar Structure In the Vicinity Of φ *supporting

confidence: 90%

Section: Micellar Structure In the Vicinity Of φ *mentioning

confidence: 94%

Section: Relaxational Behavior In the Vicinity Of φ *mentioning

confidence: 95%

See 1 more Smart Citation

Scattering properties of salt-free wormlike micellar solutions

Bellour

Knaebel

Munch

et al. 2000

The European Physical Journal E

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“…Although a strong alignment is observed under shear, it seems that no restructuring of the solution occurs during the application of shear, such as the shear-induced aggregation observed in ionic worm-like surfactant micelles under shear (Oda et al, 2000). In the present case, contrary to the wormlike micelle case, the position of the maximum of intensity does not change with shear rate.…”

Section: Solutions Under Shearcontrasting

confidence: 62%

A small-angle neutron scattering investigation of rigid polyelectrolytes under shear

et al. 2003

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Solutions of a rigid polyelectrolyte molecule, sulfo-poly(phenyleneterephthalamide) (SPTTA), in deuterated water have been investigated using small-angle neutron scattering. At low concentrations (1 wt%) the scattering spectrum presents a soft maximum similar to that of the interaction of rod-like objects. Two counterions are used, H + and Li + , and it is shown that aggregation is favoured as the proportion of Li + counterions increases. When kept at rest at room temperature, the solutions exhibit spontaneous birefringence. A 1 wt% solution was investigated under shear and it is shown that a very small shear rate is needed to produce a very strong alignment of rod-like objects. Such alignment saturates at high shear rates. Upon cessation of shear, a very long relaxation time is observed. The set of results strongly suggest aggregation of rigid polyelectrolyte molecules into long needles exhibiting very small cross sections.

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“…It has been suggested that micelle aggregation occurs already at shear rates smaller thanγ c , and that the shear thickening occurs once the mean size of the aggregates has reached some critical value [13]. Small-angle neutron scattering (SANS) also shows that structures induced by shear remain long time after the cessation of the shear [14]. However, if the shear rate is removed during the induction period, the stress vanishes to zero instantaneously [8].…”

Section: Introductionmentioning

confidence: 99%