Two methane molecules inside a carbon nanotube
Two methane molecules inside an "armchair" carbon nanotube (7,7) of radius 4.75 A and length of 24.535 A. for more detalis click here
I used two kinds of potential in the molecular dynamics simulation:
1). Brenner potential for short-range interactios on the carbon atoms of the nanotube wall and between the hydrogen atoms and the carbon atom of the methane molecule.
2). Lennard-Jones potential for long-range interactions between the methane and the carbon atoms of the tube wall.
Next, Newton's equations of motion are integrated using predictor-corrector algorithm. From the algorithm, we can get new positions, velocities, and accelerations of the particles(atoms) after one time step of 0.5 fsec. I repeat these calculations during a wanted period.
The animation was made using Aviz program**. The total time of the simulation is 1500 fsec, in temperature of 77K.