Patterning of poly (acrylic acid) by ionic exchange reactions in microfluidic channels

Michal Lahav*, Max Narovlyansky, Adam Winkleman, Raquel Perez-Castillejos, Emily A. Weiss, George M. Whitesides

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The in-plane patterning of thin films of poly(acrylic acid) (PAA) within microfluidic channels by crosslinking with metal cations was investigated. The PAA film was patterned with a solution of metal cations in methanol/water flowing through a poly(dimethylsiloxane) (PDMS) microfluidic channel that was in contact with the film of PAA. The solubility of the polymer decreased in water due to crosslinking by the solution. Water was used to dissolve the non crosslinked regions of the PAA film after removing the PDMS stamp and rinsing the substrate with methanol. The process generated a topologically patterned surface having features of PAA will small lateral and vertical dimensions. Reductants and other reagents converted appropriate crosslinking cations to metallic or semiconducting nanoparticles throughout the PAA matrix. A set of microfluidic channels were used as a mold to fabricate a patterned substrate for formation of metal and semiconductor nanoparticles.

Original languageEnglish (US)
Pages (from-to)3174-3178
Number of pages5
JournalAdvanced Materials
Issue number23
StatePublished - Dec 4 2006

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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