Surfactant-induced forces between carbon nanotubes

Panagiotis Angelikopoulos, Keith Schou, Henry Bock

Research output: Contribution to journalArticle

Abstract

Dissipative particle dynamics simulations are employed to study surfactant-mediated forces between a pair of perpendicular carbon nanotubes (CNTs) coated by surfcatants which form spherical micelles in bulk solution and on the tubes. Two force regimes are observed: at small tube/tube distances the force is attractive, whereas it is repulsive at larger distances. The attractive regime is dominated by a central micelle binding the tubes, while in the repulsive regime the contact region is depleted. The two regimes are separated by a discontinuous transition. The repulsive regime is critical for stabilizing CNT suspensions. Viewing rebundling as a thermally activated process, a connection between the repulsive force and the rebundling rate is established. We find that a larger hydrophilic surfactant headgroup creates a stronger and longer ranged tube/tube force, which reduces the rebundling rate significantly. The longer range originates directly from the further reaching head corona of the adsorbed surfactant layer. The larger magnitude of the force appears to be related to the axial compression force the adsorbed phase can sustain. This compression force appears to be the most critical factor for suspension design. © 2010 American Chemical Society.

Original languageEnglish
Pages (from-to)18874-18883
Number of pages10
JournalLangmuir
Volume26
Issue number24
DOIs
Publication statusPublished - 21 Dec 2010

Fingerprint

carbon nanotubes
surfactants
tubes
micelles
coronas
simulation

Cite this

Angelikopoulos, P., Schou, K., & Bock, H. (2010). Surfactant-induced forces between carbon nanotubes. Langmuir, 26(24), 18874-18883. https://doi.org/10.1021/la103974u
Angelikopoulos, Panagiotis ; Schou, Keith ; Bock, Henry. / Surfactant-induced forces between carbon nanotubes. In: Langmuir. 2010 ; Vol. 26, No. 24. pp. 18874-18883.
@article{8b3c777d60ed4ac8a606418cdaf58b4c,
title = "Surfactant-induced forces between carbon nanotubes",
abstract = "Dissipative particle dynamics simulations are employed to study surfactant-mediated forces between a pair of perpendicular carbon nanotubes (CNTs) coated by surfcatants which form spherical micelles in bulk solution and on the tubes. Two force regimes are observed: at small tube/tube distances the force is attractive, whereas it is repulsive at larger distances. The attractive regime is dominated by a central micelle binding the tubes, while in the repulsive regime the contact region is depleted. The two regimes are separated by a discontinuous transition. The repulsive regime is critical for stabilizing CNT suspensions. Viewing rebundling as a thermally activated process, a connection between the repulsive force and the rebundling rate is established. We find that a larger hydrophilic surfactant headgroup creates a stronger and longer ranged tube/tube force, which reduces the rebundling rate significantly. The longer range originates directly from the further reaching head corona of the adsorbed surfactant layer. The larger magnitude of the force appears to be related to the axial compression force the adsorbed phase can sustain. This compression force appears to be the most critical factor for suspension design. {\circledC} 2010 American Chemical Society.",
author = "Panagiotis Angelikopoulos and Keith Schou and Henry Bock",
year = "2010",
month = "12",
day = "21",
doi = "10.1021/la103974u",
language = "English",
volume = "26",
pages = "18874--18883",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "24",

}

Angelikopoulos, P, Schou, K & Bock, H 2010, 'Surfactant-induced forces between carbon nanotubes', Langmuir, vol. 26, no. 24, pp. 18874-18883. https://doi.org/10.1021/la103974u

Surfactant-induced forces between carbon nanotubes. / Angelikopoulos, Panagiotis; Schou, Keith; Bock, Henry.

In: Langmuir, Vol. 26, No. 24, 21.12.2010, p. 18874-18883.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Surfactant-induced forces between carbon nanotubes

AU - Angelikopoulos, Panagiotis

AU - Schou, Keith

AU - Bock, Henry

PY - 2010/12/21

Y1 - 2010/12/21

N2 - Dissipative particle dynamics simulations are employed to study surfactant-mediated forces between a pair of perpendicular carbon nanotubes (CNTs) coated by surfcatants which form spherical micelles in bulk solution and on the tubes. Two force regimes are observed: at small tube/tube distances the force is attractive, whereas it is repulsive at larger distances. The attractive regime is dominated by a central micelle binding the tubes, while in the repulsive regime the contact region is depleted. The two regimes are separated by a discontinuous transition. The repulsive regime is critical for stabilizing CNT suspensions. Viewing rebundling as a thermally activated process, a connection between the repulsive force and the rebundling rate is established. We find that a larger hydrophilic surfactant headgroup creates a stronger and longer ranged tube/tube force, which reduces the rebundling rate significantly. The longer range originates directly from the further reaching head corona of the adsorbed surfactant layer. The larger magnitude of the force appears to be related to the axial compression force the adsorbed phase can sustain. This compression force appears to be the most critical factor for suspension design. © 2010 American Chemical Society.

AB - Dissipative particle dynamics simulations are employed to study surfactant-mediated forces between a pair of perpendicular carbon nanotubes (CNTs) coated by surfcatants which form spherical micelles in bulk solution and on the tubes. Two force regimes are observed: at small tube/tube distances the force is attractive, whereas it is repulsive at larger distances. The attractive regime is dominated by a central micelle binding the tubes, while in the repulsive regime the contact region is depleted. The two regimes are separated by a discontinuous transition. The repulsive regime is critical for stabilizing CNT suspensions. Viewing rebundling as a thermally activated process, a connection between the repulsive force and the rebundling rate is established. We find that a larger hydrophilic surfactant headgroup creates a stronger and longer ranged tube/tube force, which reduces the rebundling rate significantly. The longer range originates directly from the further reaching head corona of the adsorbed surfactant layer. The larger magnitude of the force appears to be related to the axial compression force the adsorbed phase can sustain. This compression force appears to be the most critical factor for suspension design. © 2010 American Chemical Society.

UR - http://www.scopus.com/inward/record.url?scp=78650189722&partnerID=8YFLogxK

U2 - 10.1021/la103974u

DO - 10.1021/la103974u

M3 - Article

VL - 26

SP - 18874

EP - 18883

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 24

ER -

Angelikopoulos P, Schou K, Bock H. Surfactant-induced forces between carbon nanotubes. Langmuir. 2010 Dec 21;26(24):18874-18883. https://doi.org/10.1021/la103974u