Study of shear thinning in high polymer solution using dynamic NMR microscopy

Xia, Yuqing; Callaghan, P. T.

doi:10.1021/ma00017a008

Cited by 74 publications

(35 citation statements)

References 10 publications

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“…We have described the artifacts convection can generate ACKNOWLEDGMENTS in gradient enhanced NMR spectroscopy and outlined two some time (4,10,11,(19)(20)(21) and introduced for diffusion pointing us to Ref. (8), where the sinc-type behavior of Eq.…”

Section: Discussionmentioning

confidence: 99%

Convection Compensation in Gradient Enhanced Nuclear Magnetic Resonance Spectroscopy

Jerschow

Müller

1998

Journal of Magnetic Resonance

101

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Section: Discussionmentioning

confidence: 99%

Convection Compensation in Gradient Enhanced Nuclear Magnetic Resonance Spectroscopy

Jerschow

Müller

1998

Journal of Magnetic Resonance

101

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“…And finally it may be used to directly measure the velocity auto-correlation function in a fluctuating velocity field, such as may occur during flow in porous media (12). It is not the purpose of this article to review these applications, which in fact are described in detail elsewhere (2,3,(6)(7)(8)(9)(10)(11)(12)(13). Rather it is to make clear some important practical details regarding the successful implementation of these methods.…”

Section: Fig 1-continuedmentioning

confidence: 99%

Double PGSE NMR with Stimulated Echoes: Phase Cycles for the Selection of Desired Encoding

Khrapitchev

Callaghan

2001

Journal of Magnetic Resonance

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“…NMR spectroscopy can be B. Medronho et al used to probe shear-induced orientations and structures [6,7] while NMR velocimetry yields the flow field in Newtonian and non-Newtonian fluids [8,9]. Further structural information is provided by studying self diffusion and its anisotropy in samples with shear-induced structures [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Transient and Steady-State Shear Banding in a Lamellar Phase as Studied by Rheo-NMR

Medronho

Olsson

Schmidt

et al. 2012

Zeitschrift Für Physikalische Chemie

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Flow fields and shear-induced structures in the lamellar (L α ) phase of the system triethylene glycol mono n-decyl ether (C 10 E 3 )/water were investigated by NMR velocimetry, diffusometry, and 2 H NMR spectroscopy. The transformation from multilamellar vesicles (MLVs) to aligned planar lamellae is accompanied by a transient gradient shear banding. A high-shear-rate band of aligned lamellae forms next to the moving inner wall of the cylindrical Couette shear cell while a low-shear-rate band of the initial MLV structure remains close to the outer stationary wall. The band of layers grows at the expense of the band of MLVs until the transformation is completed. This process scales with the applied strain. Wall slip is a characteristic of the MLV state, while aligned layers show no deviation from Newtonian flow. The homogeneous nature of the opposite transformation from well aligned layers to MLVs via an intermediate structure resembling undulated multilamellar cylinders is confirmed. The strain dependence of this transformation appears to be independent of temperature. The shear diagram, which represents the shear-induced structures as a function of temperature and shear rate, contains a transition region between stable layers and stable MLVs. The steady-state structures in the transition region show a continuous change from layer-like at high temperature to MLV-like at lower temperature. These structures are homogeneous on a length scale above a few micrometers.

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Study of shear thinning in high polymer solution using dynamic NMR microscopy

Cited by 74 publications

References 10 publications

Convection Compensation in Gradient Enhanced Nuclear Magnetic Resonance Spectroscopy

Convection Compensation in Gradient Enhanced Nuclear Magnetic Resonance Spectroscopy

Double PGSE NMR with Stimulated Echoes: Phase Cycles for the Selection of Desired Encoding

Transient and Steady-State Shear Banding in a Lamellar Phase as Studied by Rheo-NMR

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