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. Author manuscript; available in PMC: 2011 Feb 15.
Published in final edited form as: J Control Release. 2009 Dec 24;141(3):303–313. doi: 10.1016/j.jconrel.2009.12.012

Figure 9.

Figure 9

a) Chemical structure of PS-PI-PLA block polymer.

b) Self-assembly of PS-PI-PLA on Si3N4, which in turn is on top of a microporous silicon support membrane. “Test tube structures” of PLA cylindrical dots form a hexagonal array. Here only a cross-sectional slice of the array is shown. Layers are not drawn to scale since micro- and nanofeatures are of vastly different size.

c) Same as b but with PLA removed.

d) Removal of Si3N3 and wetting PS layer yields continuous nano-microporous membrane. Apparently “floating” nanostructures form a tubular hexagonal lattice in 3D.