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<div>Dear all user</div>
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<div>How can I have a force field for simulation of boron-nitride nanotube?</div>
<div>The pdb file of nanotube is as follow:</div>
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<div>HETATM 1 N1 UNK 1 1.597 0.000 -5.015 1.00 0.00 N <br>HETATM 2 N2 UNK 1 1.129 1.129 -2.870 1.00 0.00 N <br>HETATM 3 B3 UNK 1 1.129 1.129 -4.291 1.00 0.00 B <br>
HETATM 4 N4 UNK 1 0.000 1.597 -5.015 1.00 0.00 N <br>HETATM 5 N5 UNK 1 -1.129 1.129 -2.870 1.00 0.00 N <br>HETATM 6 B6 UNK 1 -1.129 1.129 -4.291 1.00 0.00 B <br>
HETATM 7 N7 UNK 1 -1.597 0.000 -5.015 1.00 0.00 N <br>HETATM 8 N8 UNK 1 -1.129 -1.129 -2.870 1.00 0.00 N <br>HETATM 9 B9 UNK 1 -1.129 -1.129 -4.291 1.00 0.00 B <br>
HETATM 10 N10 UNK 1 0.000 -1.597 -5.015 1.00 0.00 N <br>HETATM 11 N11 UNK 1 1.129 -1.129 -2.870 1.00 0.00 N <br>HETATM 12 B12 UNK 1 1.129 -1.129 -4.291 1.00 0.00 B <br>
HETATM 13 N13 UNK 1 1.597 0.000 -0.724 1.00 0.00 N <br>HETATM 14 B14 UNK 1 1.597 0.000 -2.145 1.00 0.00 B <br>HETATM 15 N15 UNK 1 1.129 1.129 1.421 1.00 0.00 N <br>
HETATM 16 B16 UNK 1 1.129 1.129 0.000 1.00 0.00 B <br>HETATM 17 N17 UNK 1 0.000 1.597 -0.724 1.00 0.00 N <br>HETATM 18 B18 UNK 1 0.000 1.597 -2.145 1.00 0.00 B <br>
HETATM 19 N19 UNK 1 -1.129 1.129 1.421 1.00 0.00 N <br>HETATM 20 B20 UNK 1 -1.129 1.129 0.000 1.00 0.00 B <br>HETATM 21 N21 UNK 1 -1.597 0.000 -0.724 1.00 0.00 N <br>
HETATM 22 B22 UNK 1 -1.597 0.000 -2.145 1.00 0.00 B <br>HETATM 23 N23 UNK 1 -1.129 -1.129 1.421 1.00 0.00 N <br>HETATM 24 B24 UNK 1 -1.129 -1.129 0.000 1.00 0.00 B <br>
HETATM 25 N25 UNK 1 0.000 -1.597 -0.724 1.00 0.00 N <br>HETATM 26 B26 UNK 1 0.000 -1.597 -2.145 1.00 0.00 B <br>HETATM 27 N27 UNK 1 1.129 -1.129 1.421 1.00 0.00 N <br>
HETATM 28 B28 UNK 1 1.129 -1.129 0.000 1.00 0.00 B <br>HETATM 29 N29 UNK 1 1.597 0.000 3.566 1.00 0.00 N <br>HETATM 30 B30 UNK 1 1.597 0.000 2.145 1.00 0.00 B <br>
HETATM 31 B31 UNK 1 1.129 1.129 4.291 1.00 0.00 B <br>HETATM 32 N32 UNK 1 0.000 1.597 3.566 1.00 0.00 N <br>HETATM 33 B33 UNK 1 0.000 1.597 2.145 1.00 0.00 B <br>
HETATM 34 B34 UNK 1 -1.129 1.129 4.291 1.00 0.00 B <br>HETATM 35 N35 UNK 1 -1.597 0.000 3.566 1.00 0.00 N <br>HETATM 36 B36 UNK 1 -1.597 0.000 2.145 1.00 0.00 B <br>
HETATM 37 B37 UNK 1 -1.129 -1.129 4.291 1.00 0.00 B <br>HETATM 38 N38 UNK 1 0.000 -1.597 3.566 1.00 0.00 N <br>HETATM 39 B39 UNK 1 0.000 -1.597 2.145 1.00 0.00 B <br>
HETATM 40 B40 UNK 1 1.129 -1.129 4.291 1.00 0.00 B <br>HETATM 41 H41 UNK 1 -2.140 0.000 -5.855 1.00 0.00 H <br>HETATM 42 H42 UNK 1 0.000 2.140 -5.855 1.00 0.00 H <br>
HETATM 43 H43 UNK 1 2.140 0.000 -5.855 1.00 0.00 H <br>HETATM 44 H44 UNK 1 0.000 -2.140 -5.855 1.00 0.00 H <br>HETATM 45 H45 UNK 1 1.582 1.582 5.282 1.00 0.00 H <br>
HETATM 46 H46 UNK 1 1.582 -1.582 5.282 1.00 0.00 H <br>HETATM 47 H47 UNK 1 -1.582 1.582 5.282 1.00 0.00 H <br>HETATM 48 H48 UNK 1 -1.582 -1.582 5.282 1.00 0.00 H </div>
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<div>regards</div>
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<div>Javad</div>