Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/341213
Type: Artigo
Title: Spreading patterns of high velocity nanodroplets impacting on suspended graphene
Author: Jaques, Ygor Morais
Galvão, Douglas Soares
Abstract: The determination of the wettability of 2D materials is an area of intensive research, as it is decisive on the applications of these systems in nanofluidics. One important part of the wetting characterization is how the spreading of droplets impacting on the surfaces occurs. However, few works address this problem for layered materials. Here, we report a fully atomistic molecular dynamics study on the dynamics of impact of water nanodroplets (100 angstrom of diameter) at high velocities (from 1 up to 15 angstrom/ps) against graphene targets. Our results show that tuning graphene wettability (through parameter changes) significantly affects the structural and dynamical aspects of the nanodroplets. We identified three ranges of velocities with distinct characteristics, from simple deposition of the droplet to spreading with rebound, and finally droplet fragmentation. We also identify that in an intermediary velocity of 7 angstrom/ps, the pattern of spreading critically changes, due to formation of voids on droplet structure. These voids affect in a detrimental way the droplet spreading on the less hydrophilic surface, as it takes more time to the droplet recover from the spreading and to return to a semi-spherical configuration. When the velocity is increased to values larger than 11 angstrom/ps, the droplet fragments, which reveals the maximum possible spreading.
Subject: Grafeno
Dinâmica molecular
Água
Graphene
Molecular dynamics
Water
Country: Holanda
Editor: Elsevier
Rights: fechado
Identifier DOI: 10.1016/j.molliq.2019.02.028
Address: https://www.sciencedirect.com/science/article/pii/S0167732218353418
Date Issue: 2019
Appears in Collections:IFGW - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
000488658900053.pdf6.45 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.