2. Introduction
Overview of MoS2
Structure of MoS2
Properties
Nanotechnology Application of MoS2
Advantages
Other Nanotechnology applications of MoS2
Conclusion
3. In the society today, producing fresh water is a great challenge. (Elimelech
and Phillip, 2011; Zhao et al., 2012; Shannon et al., 2008; Fritzmann et al.,
2007). Over the years reverse osmosis and electrodialysis has been use for
desalination of seawater. But these separation systems have the problem of
forming polarization films and by product that may generate bacteria and
fouling.(A. M'nif et al., 2007).
Because of this problems caused by this separation systems, alternatives
separation membrane technology such as single layer Molybdenum
disulphide nanopore has been experimented on for desalination of seawater.
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4. Molybdenum disulphide is an inorganic compound with the formula
MoS2. It is a 100% "natural" material, it is taken out of the ground. They
also have a large active surface area and high reactivity (AZoNano,
c.2013)
MoS2 exhibits a lamellar or layer-like structure, with inter-lamellar
bonding between two adjacent layers of sulfur atoms. Van der Waals
forces between the layers is quite weak, meaning that the layers are easily
pulled apart.
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8. Advances in nanotechnology have led to the development of a
nanoporous membrane material for salt water purification. Due to this
advances, a single layer MoS2 nanopore membrane was seen as effective
and more energy efficient for seawater desalination. Latest trend by
engineers in university of Illinois USA.
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12. The molybdenum in the center attracts water, then the
sulphur on the other side pushes the water away.
The single layer sheet of MoS2 is ultra thin.
It requires less energy
It reduce operating cost
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13. Single-Layer Molybdenum Disulphide Nanopore is used for DNA
Detection(AB Farimani et al., 2015)
MoS2 is also use in the field of energy storage in lithium ion
batteries.(T Stephenson et al., 2014)
Single layer MoS2 is used as transistor/semiconductor in electronics.(B
Radisavljevic et al., 2011)
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14. In this presentation we have shown that MoS2 nanopore is a promising
technology for rejection of salt and water purification. Therefore MoS2 is
potentially an efficient membrane for seawater desalination.
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15. A single layer MoS2 nanopore is thick, and its made up of two
atoms molybdenum and sulphur. These two atoms together
exposed to DNA bases create opportunity for DNA
sequencing.
MoS2 is about 1nm thick, the thickness makes the material to
be higher to graphene in terms of signal/noise intensity for
DNA detection.
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18. The unique properties of molybdenum disulphide engender a
versatility that has enabled its use in a wide range of scientific
fields. The application of MoS2 to the Field of energy storage
in lithium ion batteries is a promising technology, it
compensate for it intermediate insertion voltage with a high
reversible capacity and an excellent rate capability.
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19. Molecular models of (a) 2H–MoS2. (b) Lithiated 2H–MoS2 showing a 5% lattice expansion in
the c-direction and a-direction due to intercalation. (c) Lithiated 1T–MoS2 showing lithium
ions occupying octahedral interstices. (d) 3R–MoS2 (e) Li2S
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20. XRD scans of MoS2 electrode at various states of charge. (a) (Bottom) as received, and (top)
after discharge to 0.01 V. Peaks marked by *are from the copper current collector.172 (b) After
discharge to 0.01 V (c) After recharge to 3.0 V
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21. A. M'nif, S. Bouguecha, B. Hamrouni, and M. Dhahbi, “Coupling of membrane
processes for brackish water desalination,” Desalination, vol. 203, no. 1–3, pp.
331–336, 2007. View at Publisher · View at Google Scholar · View at Scopus
Elimelech, M. & Phillip, W. A. The future of seawater desalination: energy,
Fritzmann, C., Lowenberg, J., Wintgens, T. & Melin, T. State-of-the-art of reverse
osmosis desalination. Desalination 216, 1–76 (2007).
http://www.azonano.com/article.aspx?ArticleID=3351
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22. http://www.rsc.org/chemistryworld/2014/01/2d-materials-graphene
Radisavljevic, B., Radenovic, A., Brivio, J., Giacometti, V. & Kis, A. Single-layer
MoS2 transistors. Nature Nanotech. 6, 147–150 (2011).
Shannon, M. A. et al. Science and technology for water purification in the coming
decades. Nature 452, 301–310 (2008).
Technology, and the environment. Science 333, 712–717 (2011).
Zhao, S. F., Zou, L., Tang, C. Y. Y. & Mulcahy, D. Recent developments in
forward osmosis: opportunities and challenges. J. Membr. Sci. 396, 1–21 (2012).
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