Preparation of gradient polyacrylate brushes in microchannels

Seongyeol Lee, Sang Gil Youm, Yeari Song, Whikum Yi, Daewon Sohn

Research output: Contribution to journalArticle

2 Scopus citations


Gradient poly(2-hydroxyethyl methacrylate) brushes were synthesized by surface-initiated atom transfer radical polymerization (ATRP) confined within a microfluidic system on a silicon wafer. For ATRP, surface initiator, 11-((2-bromo, 2-methyl) propionyloxy) undecyltrichlorosilane (BUC), was synthesized, and allowed to self-assemble in a monolayer on the Si wafer, as analyzed by XPS to confirm the presence of an ester group of BUC. A solution containing 2-hydroxyethylmethacrylate, Cu catalyst, and bipyridin was allowed to flow in a microchannel and polymerize, resulting in the brushes with a gradient of thickness on the Si wafer. Using ellipsometry and ATR-IR, we verified the gradients of well established brushes on the Si wafer. AFM and contact angle data showed that wettability of the brushes did not exhibit a linear relationship with hydrophilicity.

Original languageEnglish
Pages (from-to)4185-4189
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Issue number5
StatePublished - 2012 Jul 23


  • ATRP
  • Microchannels
  • Polymer Brushes

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