A rheological study of concentrated aqueous nanotube dispersions

Ian A. Kinloch; Simon A. Roberts; Alan H. Windle

doi:10.1016/S0032-3861(02)00664-X

A rheological study of concentrated aqueous nanotube dispersions

Ian A. Kinloch, Simon A. Roberts, Alan H. Windle

Research output: Contribution to journal › Article › peer-review

Abstract

The rheological behaviour of aqueously dispersed oxidised nanotubes has been studied at concentrations at which the nanotubes interacted with each other. The dispersed nanotubes represented a high aspect ratio system with a ratio of ∼80. Dynamic and steady shear tests were applied to the dispersions using a cone and plate rheometer. The system was found to behave as a reversibly flocculated dispersion. The structure of the dispersions was highly strain-sensitive with the linear viscoelastic region (LVR) extending to strains of 1%. The moduli within the LVR were independent of frequency and scaled with concentration by a power law. Under steady shear the dispersions rapidly shear thinned up to a Peclet number of ∼1 to 10. At higher Peclet numbers the shear thinning behaviour followed the Ostwald-de Waele power law. The dispersions were thixotropic and recovered their structure, and hence viscosity, upon standing. © 2002 Elsevier Science Ltd. All rights reserved.

Original language	English
Pages (from-to)	7483-7491
Number of pages	8
Journal	Polymer
Volume	43
Issue number	26
DOIs	https://doi.org/10.1016/S0032-3861(02)00664-X
Publication status	Published - 21 Nov 2002

Keywords

Nanotubes
Processing
Rheology

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10.1016/S0032-3861(02)00664-X

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title = "A rheological study of concentrated aqueous nanotube dispersions",

abstract = "The rheological behaviour of aqueously dispersed oxidised nanotubes has been studied at concentrations at which the nanotubes interacted with each other. The dispersed nanotubes represented a high aspect ratio system with a ratio of ∼80. Dynamic and steady shear tests were applied to the dispersions using a cone and plate rheometer. The system was found to behave as a reversibly flocculated dispersion. The structure of the dispersions was highly strain-sensitive with the linear viscoelastic region (LVR) extending to strains of 1%. The moduli within the LVR were independent of frequency and scaled with concentration by a power law. Under steady shear the dispersions rapidly shear thinned up to a Peclet number of ∼1 to 10. At higher Peclet numbers the shear thinning behaviour followed the Ostwald-de Waele power law. The dispersions were thixotropic and recovered their structure, and hence viscosity, upon standing. {\textcopyright} 2002 Elsevier Science Ltd. All rights reserved.",

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T1 - A rheological study of concentrated aqueous nanotube dispersions

AU - Kinloch, Ian A.

AU - Roberts, Simon A.

AU - Windle, Alan H.

PY - 2002/11/21

Y1 - 2002/11/21

N2 - The rheological behaviour of aqueously dispersed oxidised nanotubes has been studied at concentrations at which the nanotubes interacted with each other. The dispersed nanotubes represented a high aspect ratio system with a ratio of ∼80. Dynamic and steady shear tests were applied to the dispersions using a cone and plate rheometer. The system was found to behave as a reversibly flocculated dispersion. The structure of the dispersions was highly strain-sensitive with the linear viscoelastic region (LVR) extending to strains of 1%. The moduli within the LVR were independent of frequency and scaled with concentration by a power law. Under steady shear the dispersions rapidly shear thinned up to a Peclet number of ∼1 to 10. At higher Peclet numbers the shear thinning behaviour followed the Ostwald-de Waele power law. The dispersions were thixotropic and recovered their structure, and hence viscosity, upon standing. © 2002 Elsevier Science Ltd. All rights reserved.

AB - The rheological behaviour of aqueously dispersed oxidised nanotubes has been studied at concentrations at which the nanotubes interacted with each other. The dispersed nanotubes represented a high aspect ratio system with a ratio of ∼80. Dynamic and steady shear tests were applied to the dispersions using a cone and plate rheometer. The system was found to behave as a reversibly flocculated dispersion. The structure of the dispersions was highly strain-sensitive with the linear viscoelastic region (LVR) extending to strains of 1%. The moduli within the LVR were independent of frequency and scaled with concentration by a power law. Under steady shear the dispersions rapidly shear thinned up to a Peclet number of ∼1 to 10. At higher Peclet numbers the shear thinning behaviour followed the Ostwald-de Waele power law. The dispersions were thixotropic and recovered their structure, and hence viscosity, upon standing. © 2002 Elsevier Science Ltd. All rights reserved.

KW - Nanotubes

KW - Processing

KW - Rheology

U2 - 10.1016/S0032-3861(02)00664-X

DO - 10.1016/S0032-3861(02)00664-X

M3 - Article

VL - 43

SP - 7483

EP - 7491

JO - Polymer

JF - Polymer

IS - 26

ER -

A rheological study of concentrated aqueous nanotube dispersions

Abstract

Keywords

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