modeling nanoparticles conductive

Dear all,
I'm searching for opinions over the following matter: We would like to model and simulate low conductive organic nano(or micro)-particles that may or may not form long chains that resemble to fibers.These particles
by the time they are produced they will be "floating" in electric or magnetic fields.Does anybody happen to know the most adequate software for this matter?

Thanks in advance

Hello vagee !
I'm not sure that the software You search exists in nature. You can try the Comsol Femlab 2.3 (maybe multiphysics module) or CST-Mafia 4.1, but it's not ideal for You. Some of my univ friends faces to same problem and all of them wrote own code for this special cases.

Best regards,
Kit-the-great