How to build surface of the silica with alkyl and hydroxyl in lammps?

Dear all
How to build surface of the silica with alkyl and hydroxyl in lammps? Give me some advice,thanks!

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Pick your favorite software to build structures and generate the config. Decide on a forcefield for the interactions and put together an input file as required by lammps:
http://lammps.sandia.gov/doc/read_data.html

Carlos