Extension-induced dispersion of multi-walled carbon nanotube in non-Newtonian fluid

Joung Sook Hong, Chongyoup Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In this study, we devised an extension-induced mixer to disperse carbon nanotube (CNT) clumps into individual tubes by imposing extensional stress continuously and periodically. The rheological behavior of the CNT-dispersed suspension was investigated to examine whether the hydrodynamic dragging induces the dispersion of individual CNT from strongly entangled CNT by van der Waals force between adjacent tubes. When CNT clumps were subjected to a continuous extensional flow for a prolonged time, the optical microscopic and cryo-transmission electron microscopy studies showed that the CNT agglomerates were effectively dispersed and some of the individual nanotubes were disentangled from the CNT clump. Shear viscosity of the dispersion increased when the CNT-Boger fluid suspension was subjected to the continuous and periodic extensional flow for a prolonged time, indicating the dispersion of the individual tubes by the extensional flow. Under shear flows, however, aggregated CNT clumps formed larger, weakly bound agglomerates with diameters up to millimeters. The newly suggested mixing technique can be used effectively for mixing two different kinds of polymers with a large difference in viscosity.

Original languageEnglish
Pages (from-to)833-850
Number of pages18
JournalJournal of Rheology
Volume51
Issue number5
DOIs
Publication statusPublished - 2007 Sep 3

Fingerprint

Carbon Nanotubes
Carbon nanotubes
carbon nanotubes
Fluids
fluids
clumps
tubes
Suspensions
viscosity
Van der Waals forces
Shear viscosity
Shear flow
shear flow
Nanotubes
nanotubes
Polymers
Hydrodynamics
hydrodynamics
Viscosity
shear

Keywords

  • Boger fluid
  • Carbon nanotube
  • Dispersion
  • Extensional flow

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)

Cite this

Extension-induced dispersion of multi-walled carbon nanotube in non-Newtonian fluid. / Hong, Joung Sook; Kim, Chongyoup.

In: Journal of Rheology, Vol. 51, No. 5, 03.09.2007, p. 833-850.

Research output: Contribution to journalArticle

@article{d6f747b4f8f64746a989ee1715612141,
title = "Extension-induced dispersion of multi-walled carbon nanotube in non-Newtonian fluid",
abstract = "In this study, we devised an extension-induced mixer to disperse carbon nanotube (CNT) clumps into individual tubes by imposing extensional stress continuously and periodically. The rheological behavior of the CNT-dispersed suspension was investigated to examine whether the hydrodynamic dragging induces the dispersion of individual CNT from strongly entangled CNT by van der Waals force between adjacent tubes. When CNT clumps were subjected to a continuous extensional flow for a prolonged time, the optical microscopic and cryo-transmission electron microscopy studies showed that the CNT agglomerates were effectively dispersed and some of the individual nanotubes were disentangled from the CNT clump. Shear viscosity of the dispersion increased when the CNT-Boger fluid suspension was subjected to the continuous and periodic extensional flow for a prolonged time, indicating the dispersion of the individual tubes by the extensional flow. Under shear flows, however, aggregated CNT clumps formed larger, weakly bound agglomerates with diameters up to millimeters. The newly suggested mixing technique can be used effectively for mixing two different kinds of polymers with a large difference in viscosity.",
keywords = "Boger fluid, Carbon nanotube, Dispersion, Extensional flow",
author = "Hong, {Joung Sook} and Chongyoup Kim",
year = "2007",
month = "9",
day = "3",
doi = "10.1122/1.2751384",
language = "English",
volume = "51",
pages = "833--850",
journal = "Journal of Rheology",
issn = "0148-6055",
publisher = "Society of Rheology",
number = "5",

}

TY - JOUR

T1 - Extension-induced dispersion of multi-walled carbon nanotube in non-Newtonian fluid

AU - Hong, Joung Sook

AU - Kim, Chongyoup

PY - 2007/9/3

Y1 - 2007/9/3

N2 - In this study, we devised an extension-induced mixer to disperse carbon nanotube (CNT) clumps into individual tubes by imposing extensional stress continuously and periodically. The rheological behavior of the CNT-dispersed suspension was investigated to examine whether the hydrodynamic dragging induces the dispersion of individual CNT from strongly entangled CNT by van der Waals force between adjacent tubes. When CNT clumps were subjected to a continuous extensional flow for a prolonged time, the optical microscopic and cryo-transmission electron microscopy studies showed that the CNT agglomerates were effectively dispersed and some of the individual nanotubes were disentangled from the CNT clump. Shear viscosity of the dispersion increased when the CNT-Boger fluid suspension was subjected to the continuous and periodic extensional flow for a prolonged time, indicating the dispersion of the individual tubes by the extensional flow. Under shear flows, however, aggregated CNT clumps formed larger, weakly bound agglomerates with diameters up to millimeters. The newly suggested mixing technique can be used effectively for mixing two different kinds of polymers with a large difference in viscosity.

AB - In this study, we devised an extension-induced mixer to disperse carbon nanotube (CNT) clumps into individual tubes by imposing extensional stress continuously and periodically. The rheological behavior of the CNT-dispersed suspension was investigated to examine whether the hydrodynamic dragging induces the dispersion of individual CNT from strongly entangled CNT by van der Waals force between adjacent tubes. When CNT clumps were subjected to a continuous extensional flow for a prolonged time, the optical microscopic and cryo-transmission electron microscopy studies showed that the CNT agglomerates were effectively dispersed and some of the individual nanotubes were disentangled from the CNT clump. Shear viscosity of the dispersion increased when the CNT-Boger fluid suspension was subjected to the continuous and periodic extensional flow for a prolonged time, indicating the dispersion of the individual tubes by the extensional flow. Under shear flows, however, aggregated CNT clumps formed larger, weakly bound agglomerates with diameters up to millimeters. The newly suggested mixing technique can be used effectively for mixing two different kinds of polymers with a large difference in viscosity.

KW - Boger fluid

KW - Carbon nanotube

KW - Dispersion

KW - Extensional flow

UR - http://www.scopus.com/inward/record.url?scp=34548256272&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34548256272&partnerID=8YFLogxK

U2 - 10.1122/1.2751384

DO - 10.1122/1.2751384

M3 - Article

AN - SCOPUS:34548256272

VL - 51

SP - 833

EP - 850

JO - Journal of Rheology

JF - Journal of Rheology

SN - 0148-6055

IS - 5

ER -