Apparent softening of wet graphene membranes on a microfluidic platfor.
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2018
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Graphene is regarded as the toughest two-dimensional
material (highest in-plane elastic properties) and, as a consequence, it
has been employed/proposed as an ultrathin membrane in a myriad of
microfluidic devices. Yet, an experimental investigation of eventual
variations on the apparent elastic properties of a suspended graphene
membrane in contact with air or water is still missing. In this work, the
mechanical response of suspended monolayer graphene membranes on a
microfluidic platform is investigated via scanning probe microscopy
experiments. A high elastic modulus is measured for the membrane when
the platform is filled with air, as expected. However, a significant apparent
softening of graphene is observed when water fills the microfluidic system.
Through molecular dynamics simulations and a phenomenological model, we associate such softening to a water-induced
uncrumpling process of the suspended graphene membrane. This result may bring substantial modifications on the design
and operation of microfluidic devices which exploit pressure application on graphene membranes.
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Mechanical properties, Liquid interface
Citação
FERRARI, G. A. et al. Apparent softening of wet graphene membranes on a microfluidic platfor. ACS Nano, v. 12, n. 5, p. 4312-4320, abr. 2018. Disponível em: <https://pubs.acs.org/doi/10.1021/acsnano.7b08841>. Acesso em: 19 mar. 2019.