Molecular insight into the slip of water and ions along single layer graphene in aqueous media

Understanding modulation of water molecule slippage along graphene surfaces is crucial for many promising applications of two-dimensional materials. Here, we examine normal and shear forces on supported single-layer graphene supported by Atomic Force Microscopy and find that the composition of the electrolyte composition affects the molecular slippage of nanometer thick films of aqueous electrolytes along the graphene surface. In the light of the shear-assisted thermally activated theory, water molecules along the graphene plane are very mobile when subjected to shear. However, upon addition of an electrolyte, the cations can make water stick to graphene, while ion-specific and concentration effects are present. Recognizing the tribological and tribochemical utility of graphene, we also evaluate the impact of this behavior on its frictional response in the presence of water. Further, this work can inspire innovation in research areas where changes of the molecular slippage through the modulation of the doping characteristics of graphene.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Environ Engr in Civil Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2019

Author dc:creator

• Greenwood, Thomas Gustav

Contributors dc:contributor

• Espinosa-Marzal, Rosa M.

• graphene, water, molecular slip, electrical double layer

Statement dc:rights

• Copyright 2019 Thomas Greenwood

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/104887

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/104887