topology file for nanotube

From: sakthi kumaran (
Date: Thu Mar 10 2011 - 00:57:44 CST

    I am new to namd.I need to compute the free energy of a (5,5) nanotube
in vacuum.So where can I get the topology file for the same.

I also need clarifications of the following
1. Whether the topology file is different for different chirality of
2. whether the topology file is different when the medium chnges say vaccum
to water.
3. whether the topolgy files for (5,5) and (10,10) nanotubes can be used
together for (5,5)@(10,10) configuration.

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