A microsieve with a very uniform pore size of 260 nm and a pore to pore spa
cing of 510 nm has been fabricated using multiple exposure interference lit
hography and (silicon) micro-machining technology.
The sieve consists of a 0.1 mu m thick silicon nitride membrane perforated
with sub-micron diameter pores and a macro perforated silicon support. The
calculated clean water flux is at least one to two orders higher than that
of conventional inorganic membranes.