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Paper IPM / NanoSciences / 13072  


Abstract:  
We implement molecular dynamics simulations in canonical ensemble to study the effect of confinement on a
twodimensional crystal of point particles interacting with an inverse power law potential proportional to râ12 in a narrow channel. This system can describe colloidal particles at the airwater interface. It is shown that the system characteristics depend sensitively on the boundary conditions at the two walls providing the confinement.
The walls exert perpendicular forces on their adjacent particles. The potential between walls and particles varies
as the inverse power of ten. Structural quantities such as density profile, structure factor, and orientational order
parameter are computed. It is shown that orientational order persists near the walls even at temperatures where the system in the bulk is in fluid state. The dependence of elastic constants, stress tensor elements, shear, and bulk
moduli on density as well as the channel width is discussed. Moreover, the effect of channel incommensurability
with the triangular lattice structure is discussed. It is shown that incommensurability notably affects the system
properties. We compare our findings to those obtained by Monte Carlo simulations in Rici et al. [Phys. Rev. E
75, 011405 (2007)] and to the case with the periodic boundary condition along the channel width.
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