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RISS 인기검색어
- 검색키워드
- 저자 : H. Rafii-Tabar (검색결과 2 건)
- 무료
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Observation of fluid layering and reverse motion in double-walled carbon nanotubes
K. Yaghmaei,H. Rafii-Tabar 한국물리학회 2009 Current Applied Physics Vol.9 No.6
Most modelling-based research in the field of carbon nanotube-related nano-fluidics has been concerned with the fluid flow in single-walled carbon nanotubes (SWCNTs), showing that the dynamics of the channel affect the structure and behaviour of the fluid. We have extended this work by modelling the flow of Ar in a double-walled carbon nanotube, and have modelled the flow in both the inner shell and the outer annular region of such a nanotube. We have found that the flows in these channels are strongly correlated, such that the fluid moves in opposite directions in these two regions. This phenomenon can give rise to a circulatory motion which can be exploited in nano-fluidic devices. Fluid layering phenomenon, that is usually associated with the flow of fluids in nano-scale channels, is also observed. Furthermore, we have also found that the fluid velocity in dynamic channels is smaller than in static channels, in line with the findings reported for single-walled carbon nanotubes. Most modelling-based research in the field of carbon nanotube-related nano-fluidics has been concerned with the fluid flow in single-walled carbon nanotubes (SWCNTs), showing that the dynamics of the channel affect the structure and behaviour of the fluid. We have extended this work by modelling the flow of Ar in a double-walled carbon nanotube, and have modelled the flow in both the inner shell and the outer annular region of such a nanotube. We have found that the flows in these channels are strongly correlated, such that the fluid moves in opposite directions in these two regions. This phenomenon can give rise to a circulatory motion which can be exploited in nano-fluidic devices. Fluid layering phenomenon, that is usually associated with the flow of fluids in nano-scale channels, is also observed. Furthermore, we have also found that the fluid velocity in dynamic channels is smaller than in static channels, in line with the findings reported for single-walled carbon nanotubes.
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Molecular Dynamics Modeling of Buckling Behavior of Hydrogenated Graphyne
A. Montazeri,S. Ebrahimi,A. Rajabpour,H. Rafii-Tabar 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.7
Molecular dynamics simulation is employed to explore the influence of hydrogen adsorption on the stability behavior of graphyne (GY) as a new allotrope of carbon. The strain for the onset of buckling is determined for pristine GY and the results are compared with those for perfect graphene nanoribbons under identical conditions. The results reveal that due to the presence of triple C–C bonds in the GY structure, which are harder to rotate and bend in compression compared to single bonds, the new allotrope is stiffer than graphene during buckling phenomenon. In addition, the effect of hydrogen adsorption on the stability behavior of GY is examined with different H coverage in the range 0–50%. It is concluded that this adsorption promotes a rapid buckling which is attributed to the conversion of the stiff in-plane carbon bonding in the GY structure to the out-of-plane bonding which is weaker and easier to bend in compression. Finally, a critical value of adsorption is found above in which such a trend is not observed.
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