A chemically modified membrane is positioned between a first template having a first set of holes and a second set of {HEAD ~ holes} aligned with {TAIL ~ the first set} of holes to define a plurality of exposed portions of the membrane in such as manner as to prevent collapse of pores in the membrane during application of a differential pressure across the membrane 
aligned with
A chemically modified membrane is positioned between a first template having a first set of holes and a second set of { HEAD ~ holes } aligned with { TAIL ~ the first set } of holes to define a plurality of exposed portions of the membrane in such as manner as to prevent collapse of pores in the membrane during application of a differential pressure across the membrane
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH