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Water flow enhancement in amorphous silica nanochannels coated with monolayer graphene

Published online by Cambridge University Press:  10 July 2020

Enrique Wagemann Open the ORCID record for Enrique Wagemann [Opens in a new window] ,
Diego Becerra ,
Jens H. Walther  and
Harvey A. Zambrano Open the ORCID record for Harvey A. Zambrano [Opens in a new window]
Enrique Wagemann
Affiliation:
Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Concepción, Concepción, Chile
Diego Becerra
Affiliation:
Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad de Concepción, Concepción, Chile
Jens H. Walther
Affiliation:
Department of Mechanical Engineering, Technical University of Denmark, Copenhagen, Denmark Chair of Computational Science, ETH Zurich, Zurich, Switzerland
Harvey A. Zambrano*
Affiliation:
Department of Mechanical Engineering, Universidad Técnica Federico Santa María, Valparaiso, Chile
*
Address all correspondence to Harvey A. Zambrano at harvey.zambrano@usm.cl
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Abstract

Inspired by the recently reported translucency of monolayer graphene (GE) to wetting, atomistic simulations are employed to evaluate water flow enhancement induced by GE deposited on the inner surfaces of hydrophilic nanochannels. The flow in the coated channels exhibits a slip length of approximately 3.0 nm. Moreover, by contrasting the flow rates in channels with coated walls against flow rates in the corresponding uncoated channels, an “effective” flow enhancement from 3.2 to 3.7 is computed. The probability density function of the water dipole orientation indicates that the flow enhancement is related to a thinner structured water layer at the solid–liquid interface. This study provides quantitative evidence that GE employed as coating reduces substantially hydraulic losses in hydrophilic nanoconfinement.

Type
Research Letters
Information
MRS Communications , Volume 10 , Issue 3 , September 2020 , pp. 428 - 433
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Copyright
Copyright © Materials Research Society, 2020

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