期刊
ACS NANO
卷 10, 期 2, 页码 1829-1835出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b05250
关键词
MoS2; water desalination; nanopore; strain control; tunable nanodevice; molecular dynamics
类别
资金
- National Natural Science Foundation of China [11304214, 11374221, 11574224, 21405108]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- IBM Blue Gene Science Program
The deteriorating state of global fresh water resources represents one of the most serious challenges that scientists and policymakers currently face. Desalination technologies, which are designed to extract potable water from the planet's bountiful stores of seawater, could serve to alleviate much of the stress that presently plagues fresh water supplies. In recent decades, desalination methods have improved via water filtering architectures based on nanoporous graphene filters and artificial membranes integrated with biological water channels. Here, we report the auspicious performance (in simulations) of an alternative nanoporous desalination filter constructed from a MoS2 nanosheet. In striking contrast to graphene-based filters, we find that the open and closed states of the MoS2 filter can be regulated by the introduction of mechanical strain, yielding a highly tunable nanopore interface. By applying lateral strain to the MoS2 filter in our simulations, we see that the transition point between open and closed states occurs under tension that induces about 6% cross-sectional expansion in the membrane (6% strain); the open state of the MoS2 filter demonstrates high water transparency and a strong salt filtering capability even under 12% strain. Our results thus demonstrate the promise of a controllable nanoporous MoS2 desalination filter, wherein the morphology and size of the central nanopore can be precisely regulated by tensile strain. These findings support the design and proliferation of tunable nanodevices for filtration and other applications.
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