COLL 182 |
| Here, we describe the patterning of thin films of poly(acrylic acid) (PAA) within poly(dimethylsiloxane) (PDMS) microfluidic channels by crosslinking with metal cations that reduce the PAA solubility in water. After removing the PDMS stamp and rinsing the substrate with methanol, water was used to dissolve regions of the PAA film that were not crosslinked; this process generated a topologically patterned surface comprising features of PAA with lateral dimensions as small as 500 nm and vertical dimensions of ca. 350–500 nm. The patterned polymer and embedded metal ions (eg. ZnII, PdII) are a platform for the rapid “on-chip” growth of metallic and semiconductor nanoparticles; these particles, in turn, serve as catalysts for the electroless deposition of metal films. The patterned, crosslinked polymer serves as both a reactant and a matrix for subsequent chemistry; nanoparticles grow on the patterned regions in seconds, rather than self-assembling over hours on a preformed patterned surface.
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Fundamental Research in Colloid and Surface Chemistry
6:00 PM-8:00 PM, Monday, August 20, 2007 BCEC -- East Registration, Poster
Division of Colloid & Surface Chemistry |
