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Writing mesoscale patterns in block copolymer thin films through channel flow of a nonsolvent fluid
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10.1063/1.2723673
/content/aip/journal/apl/90/16/10.1063/1.2723673
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/16/10.1063/1.2723673
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Figures

Image of FIG. 1.
FIG. 1.

Channel flow setup. The desired mesoscopic pattern is carved through a thick polytetrafluoroethylene (PTFE) sheet; this sheet is then sandwiched between a top aluminum plate, and a bottom silicon wafer covered with a spin-coated block copolymer film, to form the channel. The syringe pump (right) drives fluid (oil) into the channel through a hole in the top plate; fluid exits at the edge of the PTFE sheet. The assembly is clamped to a digital hot plate to heat the polymer film above the glass transition temperature of the polystyrene block.

Image of FIG. 2.
FIG. 2.

PS-PHMA 21-64 diblock copolymer alignment in a complex channel. The channel is wide and from inlet to outlet. Each TM-AFM micrograph was taken at the center of the channel, at the indicated location, showing how well the cylinders ( spacing) align with the flow direction.

Image of FIG. 3.
FIG. 3.

PS-PEP 5-13 diblock copolymer alignment in the same complex channel as in Fig. 2. Each wide TM-AFM micrograph was taken at the center of the channel, at the indicated location, showing how well the cylinders ( spacing) align with the flow direction. No images are shown from the upstream portion of the channel due to extensive delamination of the film at high stresses.

Image of FIG. 4.
FIG. 4.

Alignment of PS-PHMA 21-64 in a diverging-converging wedge channel (left), which includes a preheating chamber for the fluid. The graph shows the nematic order parameter as a function of stress, after of flow at ; diamonds are from the diverging portion of the channel, whereas triangles are from the converging portion. Crosses are data generated on the same polymer from rheometer experiments (, ) for comparison. The continuous curves are fitted to the recrystallization model, with either (bold line) or (thin line).

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/content/aip/journal/apl/90/16/10.1063/1.2723673
2007-04-17
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Writing mesoscale patterns in block copolymer thin films through channel flow of a nonsolvent fluid
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/16/10.1063/1.2723673
10.1063/1.2723673
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