Water-vapor plasma-based surface activation for trichlorosilane modification of PMMA

Timothy M. Long, Shaurya Prakash, Mark A. Shannon, Jeffrey S. Moore

Research output: Contribution to journalArticlepeer-review


Separation rates and resolutions within capillary electrophoretic (CE) systems can be enhanced when surface ζ potentials are uniform with minimum deviations from ideal pluglike flow. Microfluidic CE devices based on poly-(methyl methacrylate) (PMMA) are being developed due to the optical clarity, availability, stability, and reproducible electroosmotic flow (EOF) rates displayed by this polymer. Control of EOF in polymer-based CE systems can be achieved by surface Çpotential alteration through chemical modification. Herein, a method will be presented for the surface functionalization of PMMA with chemistry analogous to formation of trichlorosilane self-assembled monolayers on SiO 2. The current method involves two separate steps. First, surface activation with water-vapor plasma introduces surface hydroxylation. Second, treatment of the plasma-treated PMMA with a substituted trichlorosilane solution forms the functional surface layer. The modified surfaces were characterized using several analytical techniques, including water contact angle, X-ray photoelectron spectroscopy, Fourier transform infrared-attenuated total reflection, secondary ion mass spectroscopy, and measurement of EOF velocities within PMMA microchannels.

Original languageEnglish (US)
Pages (from-to)4104-4109
Number of pages6
Issue number9
StatePublished - Apr 25 2006

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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