I wouldn't bother as they won't do any harm. If you feel that you must, then 'Ant Stop' which can be bought from most garden centres or DIY stores will do the trick. It is very minute granules, similar to slow release fertiliser granules which the ants will pick up on their legs and carry back to their nest, where it will poison the others.

unless there actualy nesting in one of your pots they will keep a whole lot of plant eating insects of of your seedlings etc .