# Big colloid particles and small LJ particles

units		lj
atom_style	atomic
dimension	2

lattice		sq 0.01
region		box block 0 30 0 30 -0.5 0.5
create_box	2 box
create_atoms	1 box

set		group all type/fraction 2 0.96 23984

mass		1 9
mass		2 1

velocity	all create 1.44 87287 loop geom

# multi neighbor and comm for efficiency

neighbor	1 multi
neigh_modify	delay 0
communicate	multi

# colloid potential

pair_style	colloid 12.5
pair_coeff	1 1  1.0 1.0 5.0 5.0 12.5
pair_coeff	1 2  5.0 1.0 5.0 0.0 7.0
pair_coeff	2 2 10.0 1.0 0.0 0.0 2.5

fix		1 all npt temp 2.0 2.0 1.0 iso 0.0 1.0 10.0 drag 1.0 &
	        mtk no pchain 0 tchain 1
fix		2 all enforce2d

dump		1 all atom 200 dump.colloid

thermo_style	custom step temp epair etotal press vol
thermo		1000

timestep	0.005

run		50000