Analysing the number of molecules on a colloid surface and inside the collloid

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GROMACS version: 2018.8
GROMACS modification: NO
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Dear Gromacs users,

My MD system contains a colloidal structure. Some molecules in the system are inside the colloid while some are on the surface of the colloid. I aimed to calculate the number of particular molecules on the surface and inside the colloid. May I know is there any method/gmx tool available for doing my calculations?

Appreciate your help.

Thank you.

Best Regards,

Amali

2

Maybe you can try gmx rdf.