By a News Reporter-Staff News Editor at Physics Week -- Researchers detail new data in Nanotubes. According to news reporting from Tehran, Iran, by VerticalNews journalists, research stated, "The structure and dynamics of water confined in single-walled silicon carbon nanotubes (SWSiCNTs) are investigated using molecular dynamics (MD) simulations. The density of water inside SWSiCNTs is reported, and an equation is suggested to predict the density of water inside SWSiCNTs."
The news correspondents obtained a quote from the research from the Iran University of Science and Technology, "Interestingly, the water diffusion coefficients (D) here are larger compared with those in SWCNTs and single-walled boron-nitride nanotubes (SWBNNTs). Furthermore, water inside zigzag SWCNTs has a lower diffusion coefficient than water inside armchair SWCNTs. A thorough analysis of the density profiles, hydrogen bonding, and water molecule orientation inside SWSiCNTs is presented to explore the mechanism behind the diffusive behavior of water observed here. It is shown here, by mean square displacement (MSD) analysis, that water molecules inside SWSiCNTs diffuse with a ballistic motion mechanism for up to 500 ps. Additionally it is confirmed here for the first time that water molecules confined in the SWSiCNTs with diameters of less than 10 angstrom obey the single-file diffusion mechanism at time scales in excess of 500 ps. The orientation of water molecules inside SWSiCNTs could be a good explanation for the difference between the diffusion coefficient in (6,6) and (10,0) SWSiCNTs. Finally, a PMF analysis explains the difficulty of water entrance into SWSiCNTs and also the different water self-diffusion inside armchair and zigzag SWSiCNTs."
According to the news reporters, the research concluded: "These results are motivating reasons to use SWSiCNTs in nanoscale biochannels, for instance, in drug-delivery applications."
For more information on this research see: Molecular dynamics simulation of single-walled silicon carbide nanotubes immersed in water. Journal of Molecular Graphics & Modelling, 2013;44():33-43. Journal of Molecular Graphics & Modelling can be contacted at: Elsevier Science Inc, 360 Park Ave South, New York, NY 10010-1710, USA. (Elsevier - www.elsevier.com; Journal of Molecular Graphics & Modelling - www.elsevier.com/wps/product/cws_home/525012)
Our news journalists report that additional information may be obtained by contacting F. Taghavi, Iran Univ Sci & Technol, Dept. of Chem, Mol Simulat Res Lab, Tehran, Iran. Additional authors for this research include S. Javadian and S.M. Hashemianzadeh.
Keywords for this news article include: Iran, Asia, Tehran, Physics, Nanotechnology, Molecular Dynamics, Emerging Technologies
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