Note that glass posts were utilized only for the validation studies so that the same pillar mold (and thus length) could be used for a variety of gap sizes.
Mostly, there were sandstone pillars, molded by the Saharan winds into amusing facsimiles: pig, lighthouse, porcupine, cleaver, Martini glass, mushroom, gas pump.
Figure 3 SEM images of PDMS pillars molded into the toluene (a, b) or hexane (c, d) treated mold.
Figure 3 shows the PDMS pillar arrays molded into the master template treated with FOTS, with additional surface treatment using toluene or hexane solvent.
Built in Mediterranean style in 1997, the house was recently renovated and expanded and has walnut floors, limestone, stone pillars and detailed molding throughout.
Also, by simply adjusting the NIL mold pillar diameters, it is possible to match the nanoparticle diameter to dimensional resonances for excitation wavelengths varying from UV to near-IR.
This is because for the application as nanoimprint mold, the hole pattern in PDMS (pillar in the master mold) is much more mechanically stable than the pillar pattern (hole in the master mold).
The pillars were fabricated by molding with undiluted PDMS into the FOTS-treated master mold without additional solvent treatment.
In addition, many reports including the above two are for PDMS filling into protruded features (e.g., an array of pillar) in the master mold that is easier when the pillars are well separated than filling into (recessed) holes.
The technique benefits from the vertical shrinkage of polymer solutions to ensure perforation by the pillars on the mold.
This mask was then used to pattern an array of SU-8 pillars on the mold master by selective exposure to UV irradiation in a Karl Suss mask aligner system.
