Wettability transparency and the quasiuniversal relationship between hydrodynamic slip and contact angle

Bladimir Ramos-Alvarado, Satish Kumar, G. P. Peterson

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The universality of the scaling laws that correlate the hydrodynamic slip length and static contact angle was investigated by introducing the concept of the wettability transparency of graphene-coated surfaces. Equilibrium molecular dynamics simulations of droplet wettability for Si(111), Si(100), and graphene-coated silicon surfaces were performed to determine the conditions required to obtain similar contact angles between bare and graphene-coated surfaces (wettability transparency). The hydrodynamic slip length was determined by means of equilibrium calculations for silicon and graphene-coated silicon nanochannels. The results indicate that the slip-wettability scaling laws can be used to describe the slip behavior of the bare silicon nanochannels in general terms; however, clear departures from a general universal description were observed for hydrophobic conditions. In addition, a significant difference in the hydrodynamic slippage was observed under wettability transparency conditions. Alternatively, the hydrodynamic boundary condition for silicon and graphene-coated silicon nanochannels was more accurately predicted by observing the density depletion length, posing this parameter as a better alternative than the contact angle to correlate with the slip length.

Original languageEnglish (US)
Article number074105
JournalApplied Physics Letters
Volume108
Issue number7
DOIs
StatePublished - Feb 15 2016

Fingerprint

wettability
slip
hydrodynamics
graphene
silicon
scaling laws
depletion
boundary conditions
molecular dynamics
simulation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

@article{53ade8db992f4b459061f0ada5417dcf,
title = "Wettability transparency and the quasiuniversal relationship between hydrodynamic slip and contact angle",
abstract = "The universality of the scaling laws that correlate the hydrodynamic slip length and static contact angle was investigated by introducing the concept of the wettability transparency of graphene-coated surfaces. Equilibrium molecular dynamics simulations of droplet wettability for Si(111), Si(100), and graphene-coated silicon surfaces were performed to determine the conditions required to obtain similar contact angles between bare and graphene-coated surfaces (wettability transparency). The hydrodynamic slip length was determined by means of equilibrium calculations for silicon and graphene-coated silicon nanochannels. The results indicate that the slip-wettability scaling laws can be used to describe the slip behavior of the bare silicon nanochannels in general terms; however, clear departures from a general universal description were observed for hydrophobic conditions. In addition, a significant difference in the hydrodynamic slippage was observed under wettability transparency conditions. Alternatively, the hydrodynamic boundary condition for silicon and graphene-coated silicon nanochannels was more accurately predicted by observing the density depletion length, posing this parameter as a better alternative than the contact angle to correlate with the slip length.",
author = "Bladimir Ramos-Alvarado and Satish Kumar and Peterson, {G. P.}",
year = "2016",
month = "2",
day = "15",
doi = "10.1063/1.4942400",
language = "English (US)",
volume = "108",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "7",

}

Wettability transparency and the quasiuniversal relationship between hydrodynamic slip and contact angle. / Ramos-Alvarado, Bladimir; Kumar, Satish; Peterson, G. P.

In: Applied Physics Letters, Vol. 108, No. 7, 074105, 15.02.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Wettability transparency and the quasiuniversal relationship between hydrodynamic slip and contact angle

AU - Ramos-Alvarado, Bladimir

AU - Kumar, Satish

AU - Peterson, G. P.

PY - 2016/2/15

Y1 - 2016/2/15

N2 - The universality of the scaling laws that correlate the hydrodynamic slip length and static contact angle was investigated by introducing the concept of the wettability transparency of graphene-coated surfaces. Equilibrium molecular dynamics simulations of droplet wettability for Si(111), Si(100), and graphene-coated silicon surfaces were performed to determine the conditions required to obtain similar contact angles between bare and graphene-coated surfaces (wettability transparency). The hydrodynamic slip length was determined by means of equilibrium calculations for silicon and graphene-coated silicon nanochannels. The results indicate that the slip-wettability scaling laws can be used to describe the slip behavior of the bare silicon nanochannels in general terms; however, clear departures from a general universal description were observed for hydrophobic conditions. In addition, a significant difference in the hydrodynamic slippage was observed under wettability transparency conditions. Alternatively, the hydrodynamic boundary condition for silicon and graphene-coated silicon nanochannels was more accurately predicted by observing the density depletion length, posing this parameter as a better alternative than the contact angle to correlate with the slip length.

AB - The universality of the scaling laws that correlate the hydrodynamic slip length and static contact angle was investigated by introducing the concept of the wettability transparency of graphene-coated surfaces. Equilibrium molecular dynamics simulations of droplet wettability for Si(111), Si(100), and graphene-coated silicon surfaces were performed to determine the conditions required to obtain similar contact angles between bare and graphene-coated surfaces (wettability transparency). The hydrodynamic slip length was determined by means of equilibrium calculations for silicon and graphene-coated silicon nanochannels. The results indicate that the slip-wettability scaling laws can be used to describe the slip behavior of the bare silicon nanochannels in general terms; however, clear departures from a general universal description were observed for hydrophobic conditions. In addition, a significant difference in the hydrodynamic slippage was observed under wettability transparency conditions. Alternatively, the hydrodynamic boundary condition for silicon and graphene-coated silicon nanochannels was more accurately predicted by observing the density depletion length, posing this parameter as a better alternative than the contact angle to correlate with the slip length.

UR - http://www.scopus.com/inward/record.url?scp=84960926005&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84960926005&partnerID=8YFLogxK

U2 - 10.1063/1.4942400

DO - 10.1063/1.4942400

M3 - Article

AN - SCOPUS:84960926005

VL - 108

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 7

M1 - 074105

ER -