A polymeric microfluidic valve employing a pH-responsive hydrogel microsphere as an actuating source

Ji Young Park, Hyun Jik Oh, Duck Joong Kim, Ju Yeoul Baek, Sang Hoon Lee

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

In this paper, we propose a new fabrication method for pH-responsive microfluidic valves. Conventionally, an in situ photopolymerization method has been employed to build the micro functional structure inside a microfluidic channel. Here, we suggest a new method that allows the mass production of a stimuli-responsive microsystem through the use of a pre-made microstructure as an actuating element, like the assembly of commercial products in a factory. We have massively fabricated pH-responsive microspheres that act as an actuating component through the use of PDMS-based microfluidic apparatus and an 'on the fly' photopolymerization method. By incorporation of this microsphere into the microvalve during the fabrication process, we have produced a pH-responsive microfluidic valve in a simple way. The operation and the function of the fabricated microvalve were evaluated through diverse experiments. The microvalve was successfully fabricated, and functioned well according to the pH change.

Original languageEnglish
Pages (from-to)656-663
Number of pages8
JournalJournal of Micromechanics and Microengineering
Volume16
Issue number3
DOIs
Publication statusPublished - 2006 Mar 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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