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TEM micrograph of 75TEOS/25PS308-b-PEO250 silica nanoparticles (A), schematic top-view of a depth-filter functionalized 5 μm pore (B), optical micrograph of a Si3N4 microsieve before (C) and after (D) fuctionalization with silica nanoparticles. Insets in pictures C and D show the SEM micrograph of a single microsieve pore collected at high magnification.
