The use of such a focused acoustic ejection system enables preparation of arrays on porous surfaces that will generally have a density in {HEAD ~ the range} of {TAIL ~ at least 62,500 molecular moieties} as array “elements” per square centimeter of substrate surface, preferably at least 250,000 molecular moieties per square centimeter of substrate surface, more preferably at least 1,000,000, most preferably at least 1,500,000, and optimally in the range of about 1,500,000 to about 4,000,000 molecular moieties per square centimeter of substrate surface 
The use of such a focused acoustic ejection system enables preparation of arrays on porous surfaces that will generally have a density in { HEAD ~ the range } of { TAIL ~ at least 62,500 molecular moieties } as array “ elements ” per square centimeter of substrate surface , preferably at least 250,000 molecular moieties per square centimeter of substrate surface , more preferably at least 1,000,000 , most preferably at least 1,500,000 , and optimally in the range of about 1,500,000 to about 4,000,000 molecular moieties per square centimeter of substrate surface
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