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Illustration of the experimental procedure. A cross-sectional SEM image is shown in the figure for the microstructure of a PDMS stamp.
Typical ordering results for various PS beads and PDMS stamps. (a)–(d) OM images of ordered PS beads along the channels of a PDMS stamp when annealed for at under a pressure of . and 0.85 for (a) and (c), respectively. Magnified views [(b) and (d), circled regions] show a single or multiple lines of PS beads along the channel direction depending on the initial fractional density; (e) SEM image of an interconnected structure of PS beads for a PDMS stamp having cylinders (positive) and PS beads, annealed for at under a pressure of ; (f) SEM image of a star-shaped isolated structure. A PDMS stamp having voids (negative) and PS beads were used, annealed for at under a pressure of .
(a) Calculation of zero shear viscosity using the William–Landel–Ferry (WLF) equation, which gives and for ; (b) comparison between theory and experimental data at various conditions.
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