[gmx-users] Nanoparticles does not interact

osmair oliveira osmair07 at hotmail.com
Thu May 28 22:28:47 CEST 2009


My *.top file is:

#include "ffoplsaa.itp"

[ moleculetype ]
; Name            nrexcl
CeO             3

[ atoms ]
 ;   nr type resnr residue  atom cgnr charge mass
 1    opls_966  1  CeO  O  1  -0.5000  15.9994
....
 53   opls_967  1  CeO  Ce 2   1.0000 140.116
....
[ bonds ]
53 1 1
...
[ angles ]
53 1 54 1
...

[ system ]
; Name
CeO

[ molecules ]
; Compound        #mols
CeO            4

I do not have dihedral parameters and
I don not include [ pairs ] and the cutoff is 0.9 nm

Thans so much.

Osmair



> Date: Thu, 28 May 2009 22:18:32 +0200
> From: p.yamin at fz-juelich.de
> Subject: Re: [gmx-users] Nanoparticles does not interact
> To: gmx-users at gromacs.org
> 
> should they really have SR interactions? what about LRs? where are they (system topology) ? do they feel each other (cutoffs) ? what do you get visualized?
> 
> 
> 
> Peyman Yamin
> Institut fuer Strukturbiologie und Biophysik (ISB)
> ISB-3: Strukturbiochemie
> Forschungszentrum Juelich
> D-52425 Juelich 
> Tel:	(49)-2461-61-2875  
> Fax:	(49)-2461-61-2023
> mailto: p.yamin[at]fz-juelich.de 
> Content-Type: multipart/alternative;
> 	boundary="_501ba45b-9607-437c-8b28-bab65219d4e2_"
> 
> 
> --_501ba45b-9607-437c-8b28-bab65219d4e2_
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> 
> 
> Hi=2C
> I have minimized four nanoparticle (with 0.5 nm of distance)
> using the oplsaa force field=2C but the output (*.edr) shows that
> the interactions (Coul-SR and LJ-SR) between the nanoparticles are zero=2C
> as example:
>        Coul-SR:1CeO-1CeO   5.84835e+04   5.43362e+09   4.45364e+06
>          LJ-SR:1CeO-1CeO   2.26278e+00   2.10345e+05  -1.26800e+02
>        Coul-SR:1CeO-2CeO   0.00000e+00   0.00000e+00   0.00000e+00
>          LJ-SR:1CeO-2CeO   0.00000e+00   0.00000e+00   0.00000e+00
>        Coul-SR:1CeO-3CeO   0.00000e+00   0.00000e+00   0.00000e+00
>          LJ-SR:1CeO-3CeO   0.00000e+00   0.00000e+00   0.00000e+00
>        Coul-SR:1CeO-4CeO   0.00000e+00   0.00000e+00   0.00000e+00
>          LJ-SR:1CeO-4CeO   0.00000e+00   0.00000e+00   0.00000e+00
>         .......
> 
> In my *.mdp file=2C I have defined:
> energygrps          =3D  1CeO 2CeO 3CeO 4CeO
> 
> Someone can help me?
> 
> Thanks
> 
> Ph.D. Osmair V. Oliveira
> Federal University of Sao Carlos - Brazil
> 
> _________________________________________________________________
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> --_501ba45b-9607-437c-8b28-bab65219d4e2_
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> <html>
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> padding:0px
> }
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> <body class=3D'hmmessage'>
> Hi=2C<br>I have minimized four nanoparticle (with 0.5 nm of distance)<br>us=
> ing the oplsaa force field=2C but the output (*.edr) shows that<br>the inte=
> ractions (Coul-SR and LJ-SR) between the nanoparticles are zero=2C<br>as ex=
> ample:<br>&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B Coul-SR:1CeO-1Ce=
> O&nbsp=3B&nbsp=3B 5.84835e+04&nbsp=3B&nbsp=3B 5.43362e+09&nbsp=3B&nbsp=3B 4=
> .45364e+06<br>&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=
> =3B LJ-SR:1CeO-1CeO&nbsp=3B&nbsp=3B 2.26278e+00&nbsp=3B&nbsp=3B 2.10345e+05=
> &nbsp=3B -1.26800e+02<br>&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B C=
> oul-SR:1CeO-2CeO&nbsp=3B&nbsp=3B 0.00000e+00&nbsp=3B&nbsp=3B 0.00000e+00&nb=
> sp=3B&nbsp=3B 0.00000e+00<br>&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=
> =3B&nbsp=3B&nbsp=3B LJ-SR:1CeO-2CeO&nbsp=3B&nbsp=3B 0.00000e+00&nbsp=3B&nbs=
> p=3B 0.00000e+00&nbsp=3B&nbsp=3B 0.00000e+00<br>&nbsp=3B&nbsp=3B&nbsp=3B&nb=
> sp=3B&nbsp=3B&nbsp=3B Coul-SR:1CeO-3CeO&nbsp=3B&nbsp=3B 0.00000e+00&nbsp=3B=
> &nbsp=3B 0.00000e+00&nbsp=3B&nbsp=3B 0.00000e+00<br>&nbsp=3B&nbsp=3B&nbsp=
> =3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B LJ-SR:1CeO-3CeO&nbsp=3B&nbsp=3B=
>  0.00000e+00&nbsp=3B&nbsp=3B 0.00000e+00&nbsp=3B&nbsp=3B 0.00000e+00<br>&nb=
> sp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B Coul-SR:1CeO-4CeO&nbsp=3B&nbs=
> p=3B 0.00000e+00&nbsp=3B&nbsp=3B 0.00000e+00&nbsp=3B&nbsp=3B 0.00000e+00<br=
> >&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B LJ-SR:1Ce=
> O-4CeO&nbsp=3B&nbsp=3B 0.00000e+00&nbsp=3B&nbsp=3B 0.00000e+00&nbsp=3B&nbsp=
> =3B 0.00000e+00<br>&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B=
>  .......<br><br>In my *.mdp file=2C I have defined:<br>energygrps&nbsp=3B&n=
> bsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B&nbsp=3B =3D&nbsp=3B =
> 1CeO 2CeO 3CeO 4CeO<br><br>Someone can help me?<br><br>Thanks<br><br>Ph.D. =
> Osmair V. Oliveira<br>Federal University of Sao Carlos - Brazil<br><br /><h=
> r />Quer uma internet mais segura? <a href=3D'http://brasil.microsoft.com.b=
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