Consider a "cartridge" of sorts. Is it possible to construct a "pinhole" in the cartridge such that only one molecule will pass through at a time? If so, what sort of equipment would I need to construct such a pinhole, or what sort of company would I need to contact? (The cheaper the method, the better.)
For reference, the molecules in question are deoxribonucleotides, which are about 13 angstroms or 1.3 nanometers in diameter. The molecules would I believe be in the state of a gas.