How confined lubricants diffuse during shear

Ashis Mukhopadhyay; Sung Chul Bae; Jiang Zhao; Steve Granick

doi:10.1103/PhysRevLett.93.236105

How confined lubricants diffuse during shear

Ashis Mukhopadhyay, Sung Chul Bae, Jiang Zhao, Steve Granick

Materials Science and Engineering

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

Abstract

Fluorescence correlation spectroscopy (FCS) was used to investigate the translational diffusion of a fluorescent dye embedded at a dilute concentration in a confined fluid at rest and during shear. Octamethylcyclotetrasiloxane (OMCTS), confined between step-free muscovite mica to thickness 3-4 layers was used for the investigation. The time scales of intensity-intensity autocorrelation functions were shown to be same during shear and at rest, except they were found to be faster by a factor of 2 to 5, by fluorescence correlation spectroscopy. The results show that the activation volume for diffusion exceeds in the bulk liquid by ≈ 3 orders of magnitude.

Original language	English (US)
Article number	236105
Journal	Physical review letters
Volume	93
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.93.236105
State	Published - Dec 3 2004

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Physics and Astronomy(all)

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10.1103/PhysRevLett.93.236105

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title = "How confined lubricants diffuse during shear",

abstract = "Fluorescence correlation spectroscopy (FCS) was used to investigate the translational diffusion of a fluorescent dye embedded at a dilute concentration in a confined fluid at rest and during shear. Octamethylcyclotetrasiloxane (OMCTS), confined between step-free muscovite mica to thickness 3-4 layers was used for the investigation. The time scales of intensity-intensity autocorrelation functions were shown to be same during shear and at rest, except they were found to be faster by a factor of 2 to 5, by fluorescence correlation spectroscopy. The results show that the activation volume for diffusion exceeds in the bulk liquid by ≈ 3 orders of magnitude.",

author = "Ashis Mukhopadhyay and Bae, {Sung Chul} and Jiang Zhao and Steve Granick",

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AU - Mukhopadhyay, Ashis

AU - Bae, Sung Chul

AU - Zhao, Jiang

AU - Granick, Steve

N1 - Funding Information: This work was supported by the U.S. Department of Energy, Division of Materials Science under contract no. DEFG02-91ER45439 with the Frederick Seitz Materials Research Laboratory at the University of Illinois at Urbana-Champaign.

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Y1 - 2004/12/3

N2 - Fluorescence correlation spectroscopy (FCS) was used to investigate the translational diffusion of a fluorescent dye embedded at a dilute concentration in a confined fluid at rest and during shear. Octamethylcyclotetrasiloxane (OMCTS), confined between step-free muscovite mica to thickness 3-4 layers was used for the investigation. The time scales of intensity-intensity autocorrelation functions were shown to be same during shear and at rest, except they were found to be faster by a factor of 2 to 5, by fluorescence correlation spectroscopy. The results show that the activation volume for diffusion exceeds in the bulk liquid by ≈ 3 orders of magnitude.

AB - Fluorescence correlation spectroscopy (FCS) was used to investigate the translational diffusion of a fluorescent dye embedded at a dilute concentration in a confined fluid at rest and during shear. Octamethylcyclotetrasiloxane (OMCTS), confined between step-free muscovite mica to thickness 3-4 layers was used for the investigation. The time scales of intensity-intensity autocorrelation functions were shown to be same during shear and at rest, except they were found to be faster by a factor of 2 to 5, by fluorescence correlation spectroscopy. The results show that the activation volume for diffusion exceeds in the bulk liquid by ≈ 3 orders of magnitude.

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How confined lubricants diffuse during shear

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