Structure and dynamics of confined alcohol-water mixtures

Pantelis Bampoulis, J.P. Witteveen, Ernst S. Kooij, Detlef Lohse, Bene Poelsema, Henricus J.W. Zandvliet

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Abstract

The effect of confinement between mica and graphene on the structure and dynamics of alcohol–water mixtures has been studied in situ and in real time at the molecular level by atomic force microscopy (AFM) at room temperature. AFM images reveal that the adsorbed molecules are segregated into faceted alcohol-rich islands on top of an ice layer on mica, surrounded by a pre-existing multilayer water-rich film. These faceted islands are in direct contact with the graphene surface, revealing a preferred adsorption site. Moreover, alcohol adsorption at low relative humidity (RH) reveals a strong preference of the alcohol molecules for the ordered ice interface. The growth dynamics of the alcohol islands is governed by supersaturation, temperature, the free energy of attachment of molecules to the island edge and two-dimensional (2D) diffusion. The measured diffusion coefficients display a size dependence on the molecular size of the alcohols, and are about 6 orders of magnitude smaller than the bulk diffusion coefficients, demonstrating the effect of confinement on the behavior of the alcohols. These experimental results provide new insights into the behavior of multicomponent fluids in confined geometries, which is of paramount importance in nanofluidics and biology.
Original languageEnglish
Pages (from-to)6762-6768
JournalACS nano
Volume10
Issue number7
DOIs
Publication statusPublished - 2016

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alcohols
Alcohols
Water
water
Graphite
Mica
Ice
mica
Graphene
Molecules
Atomic force microscopy
graphene
ice
diffusion coefficient
atomic force microscopy
Nanofluidics
Adsorption
molecules
adsorption
Supersaturation

Keywords

  • IR-101779
  • METIS-318262

Cite this

@article{c757745312c043c8ac73f1730492de31,
title = "Structure and dynamics of confined alcohol-water mixtures",
abstract = "The effect of confinement between mica and graphene on the structure and dynamics of alcohol–water mixtures has been studied in situ and in real time at the molecular level by atomic force microscopy (AFM) at room temperature. AFM images reveal that the adsorbed molecules are segregated into faceted alcohol-rich islands on top of an ice layer on mica, surrounded by a pre-existing multilayer water-rich film. These faceted islands are in direct contact with the graphene surface, revealing a preferred adsorption site. Moreover, alcohol adsorption at low relative humidity (RH) reveals a strong preference of the alcohol molecules for the ordered ice interface. The growth dynamics of the alcohol islands is governed by supersaturation, temperature, the free energy of attachment of molecules to the island edge and two-dimensional (2D) diffusion. The measured diffusion coefficients display a size dependence on the molecular size of the alcohols, and are about 6 orders of magnitude smaller than the bulk diffusion coefficients, demonstrating the effect of confinement on the behavior of the alcohols. These experimental results provide new insights into the behavior of multicomponent fluids in confined geometries, which is of paramount importance in nanofluidics and biology.",
keywords = "IR-101779, METIS-318262",
author = "Pantelis Bampoulis and J.P. Witteveen and Kooij, {Ernst S.} and Detlef Lohse and Bene Poelsema and Zandvliet, {Henricus J.W.}",
note = "Open access",
year = "2016",
doi = "10.1021/acsnano.6b02333",
language = "English",
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pages = "6762--6768",
journal = "ACS nano",
issn = "1936-0851",
publisher = "American Chemical Society",
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Structure and dynamics of confined alcohol-water mixtures. / Bampoulis, Pantelis; Witteveen, J.P.; Kooij, Ernst S.; Lohse, Detlef; Poelsema, Bene; Zandvliet, Henricus J.W.

In: ACS nano, Vol. 10, No. 7, 2016, p. 6762-6768.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Structure and dynamics of confined alcohol-water mixtures

AU - Bampoulis, Pantelis

AU - Witteveen, J.P.

AU - Kooij, Ernst S.

AU - Lohse, Detlef

AU - Poelsema, Bene

AU - Zandvliet, Henricus J.W.

N1 - Open access

PY - 2016

Y1 - 2016

N2 - The effect of confinement between mica and graphene on the structure and dynamics of alcohol–water mixtures has been studied in situ and in real time at the molecular level by atomic force microscopy (AFM) at room temperature. AFM images reveal that the adsorbed molecules are segregated into faceted alcohol-rich islands on top of an ice layer on mica, surrounded by a pre-existing multilayer water-rich film. These faceted islands are in direct contact with the graphene surface, revealing a preferred adsorption site. Moreover, alcohol adsorption at low relative humidity (RH) reveals a strong preference of the alcohol molecules for the ordered ice interface. The growth dynamics of the alcohol islands is governed by supersaturation, temperature, the free energy of attachment of molecules to the island edge and two-dimensional (2D) diffusion. The measured diffusion coefficients display a size dependence on the molecular size of the alcohols, and are about 6 orders of magnitude smaller than the bulk diffusion coefficients, demonstrating the effect of confinement on the behavior of the alcohols. These experimental results provide new insights into the behavior of multicomponent fluids in confined geometries, which is of paramount importance in nanofluidics and biology.

AB - The effect of confinement between mica and graphene on the structure and dynamics of alcohol–water mixtures has been studied in situ and in real time at the molecular level by atomic force microscopy (AFM) at room temperature. AFM images reveal that the adsorbed molecules are segregated into faceted alcohol-rich islands on top of an ice layer on mica, surrounded by a pre-existing multilayer water-rich film. These faceted islands are in direct contact with the graphene surface, revealing a preferred adsorption site. Moreover, alcohol adsorption at low relative humidity (RH) reveals a strong preference of the alcohol molecules for the ordered ice interface. The growth dynamics of the alcohol islands is governed by supersaturation, temperature, the free energy of attachment of molecules to the island edge and two-dimensional (2D) diffusion. The measured diffusion coefficients display a size dependence on the molecular size of the alcohols, and are about 6 orders of magnitude smaller than the bulk diffusion coefficients, demonstrating the effect of confinement on the behavior of the alcohols. These experimental results provide new insights into the behavior of multicomponent fluids in confined geometries, which is of paramount importance in nanofluidics and biology.

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