Self-assembly and viscosity behavior of Janus nanoparticles in nanotube flow

Yusei Kobayashi, Noriyoshi Arai

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Janus nanoparticles (JNPs) have received considerable attention because of their characteristic physical properties that are due to more than two distinct chemical or physical surfaces. We investigated the rheological properties of a JNP solution in the nanotubes using a computer simulation. Prediction and control of the self-assembly of colloidal nanoparticles is of critical importance in materials chemistry and engineering. Herein, we show computer simulation evidence of a new type of velocity profile and a hallmark shear-thinning behavior by confining a JNP solution to a nanotube with hydrophobic and hydrophilic wall surfaces. We derived curves of the shear rate versus the viscosity for two quasi-one-dimensional nanotube systems including diluted and concentrated volume fractions of JNP solutions. For the diluted system, under relatively low shear rates, shear-thinning behavior with a moderate slope or behavior similar to a Newtonian fluid is observed because of the clustering of JNPs. Under relatively high shear rates, the slope of shear thinning changes markedly because the self-assembled structures are rearranged. Moreover, for concentrated systems, when the nanotube wall is hydrophobic, new characteristic velocity profiles that have not been reported before are observed. Our simulation offers a guide to control the rheological properties of JNP solutions by the chemical patterns on the surfaces of nanochannels, the effect of confinement, and the self-assembled structure. (Chemical Equation Presented).

Original languageEnglish
Pages (from-to)736-743
Number of pages8
JournalLangmuir
Volume33
Issue number3
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

Fingerprint

Janus
Self assembly
Nanotubes
self assembly
nanotubes
Viscosity
viscosity
Nanoparticles
nanoparticles
shear thinning
Shear thinning
Shear deformation
shear
velocity distribution
computerized simulation
slopes
Newtonian fluids
Computer simulation
confining
Volume fraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Self-assembly and viscosity behavior of Janus nanoparticles in nanotube flow. / Kobayashi, Yusei; Arai, Noriyoshi.

In: Langmuir, Vol. 33, No. 3, 01.01.2017, p. 736-743.

Research output: Contribution to journalArticle

@article{066fca12bc2e4289b08d72bce3528c3a,
title = "Self-assembly and viscosity behavior of Janus nanoparticles in nanotube flow",
abstract = "Janus nanoparticles (JNPs) have received considerable attention because of their characteristic physical properties that are due to more than two distinct chemical or physical surfaces. We investigated the rheological properties of a JNP solution in the nanotubes using a computer simulation. Prediction and control of the self-assembly of colloidal nanoparticles is of critical importance in materials chemistry and engineering. Herein, we show computer simulation evidence of a new type of velocity profile and a hallmark shear-thinning behavior by confining a JNP solution to a nanotube with hydrophobic and hydrophilic wall surfaces. We derived curves of the shear rate versus the viscosity for two quasi-one-dimensional nanotube systems including diluted and concentrated volume fractions of JNP solutions. For the diluted system, under relatively low shear rates, shear-thinning behavior with a moderate slope or behavior similar to a Newtonian fluid is observed because of the clustering of JNPs. Under relatively high shear rates, the slope of shear thinning changes markedly because the self-assembled structures are rearranged. Moreover, for concentrated systems, when the nanotube wall is hydrophobic, new characteristic velocity profiles that have not been reported before are observed. Our simulation offers a guide to control the rheological properties of JNP solutions by the chemical patterns on the surfaces of nanochannels, the effect of confinement, and the self-assembled structure. (Chemical Equation Presented).",
author = "Yusei Kobayashi and Noriyoshi Arai",
year = "2017",
month = "1",
day = "1",
doi = "10.1021/acs.langmuir.6b02694",
language = "English",
volume = "33",
pages = "736--743",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "3",

}

TY - JOUR

T1 - Self-assembly and viscosity behavior of Janus nanoparticles in nanotube flow

AU - Kobayashi, Yusei

AU - Arai, Noriyoshi

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Janus nanoparticles (JNPs) have received considerable attention because of their characteristic physical properties that are due to more than two distinct chemical or physical surfaces. We investigated the rheological properties of a JNP solution in the nanotubes using a computer simulation. Prediction and control of the self-assembly of colloidal nanoparticles is of critical importance in materials chemistry and engineering. Herein, we show computer simulation evidence of a new type of velocity profile and a hallmark shear-thinning behavior by confining a JNP solution to a nanotube with hydrophobic and hydrophilic wall surfaces. We derived curves of the shear rate versus the viscosity for two quasi-one-dimensional nanotube systems including diluted and concentrated volume fractions of JNP solutions. For the diluted system, under relatively low shear rates, shear-thinning behavior with a moderate slope or behavior similar to a Newtonian fluid is observed because of the clustering of JNPs. Under relatively high shear rates, the slope of shear thinning changes markedly because the self-assembled structures are rearranged. Moreover, for concentrated systems, when the nanotube wall is hydrophobic, new characteristic velocity profiles that have not been reported before are observed. Our simulation offers a guide to control the rheological properties of JNP solutions by the chemical patterns on the surfaces of nanochannels, the effect of confinement, and the self-assembled structure. (Chemical Equation Presented).

AB - Janus nanoparticles (JNPs) have received considerable attention because of their characteristic physical properties that are due to more than two distinct chemical or physical surfaces. We investigated the rheological properties of a JNP solution in the nanotubes using a computer simulation. Prediction and control of the self-assembly of colloidal nanoparticles is of critical importance in materials chemistry and engineering. Herein, we show computer simulation evidence of a new type of velocity profile and a hallmark shear-thinning behavior by confining a JNP solution to a nanotube with hydrophobic and hydrophilic wall surfaces. We derived curves of the shear rate versus the viscosity for two quasi-one-dimensional nanotube systems including diluted and concentrated volume fractions of JNP solutions. For the diluted system, under relatively low shear rates, shear-thinning behavior with a moderate slope or behavior similar to a Newtonian fluid is observed because of the clustering of JNPs. Under relatively high shear rates, the slope of shear thinning changes markedly because the self-assembled structures are rearranged. Moreover, for concentrated systems, when the nanotube wall is hydrophobic, new characteristic velocity profiles that have not been reported before are observed. Our simulation offers a guide to control the rheological properties of JNP solutions by the chemical patterns on the surfaces of nanochannels, the effect of confinement, and the self-assembled structure. (Chemical Equation Presented).

UR - http://www.scopus.com/inward/record.url?scp=85010430739&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85010430739&partnerID=8YFLogxK

U2 - 10.1021/acs.langmuir.6b02694

DO - 10.1021/acs.langmuir.6b02694

M3 - Article

VL - 33

SP - 736

EP - 743

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 3

ER -