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Title:Molecular insight into the slip of water and ions along single layer graphene in aqueous media
Author(s):Greenwood, Thomas Gustav
Advisor(s):Espinosa-Marzal, Rosa M.
Department / Program:Civil & Environmental Eng
Discipline:Environ Engr in Civil Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:M.S.
Genre:Thesis
Subject(s):graphene, water, molecular slip, electrical double layer
Abstract: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.
Issue Date:2019-04-22
Type:Text
URI:http://hdl.handle.net/2142/104887
Rights Information:Copyright 2019 Thomas Greenwood
Date Available in IDEALS:2019-08-23
Date Deposited:2019-05


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