Hydrodynamic fabrication and characterization of a pH-responsive microscale spherical actuating element

DuckJoong Kim, SungRak Kim, JiYoung Park, JuYeoul Baek, SeonJeong Kim, Kyung Sun, TaeSoo Lee, Sang Hoon Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this paper, we report a hydrodynamic fabrication method for pH-responsive microspheres, which act as an actuating component, and we characterize their volume-changes according to variations in pH values. We fabricated the microsphere-producing apparatus by using a poly(dimethylsiloxane) (PDMS) based substrate and a pulled-glass pipette. The swelling and the shrinking motions that varied according to the size, the shape and the concentration of AA were characterized with alternating application of acidic and basic solutions. The fabricated microspheres exhibited a larger and a faster volume transition than the cylindrical shaped post, which results generally from a conventional in-situ photopolymerization method. The repeated motions resulting from the alternating change of pH value were stable and reproducible. This finding indicates that the produced microspheres can be used as an actuation component in other microdevices. To exemplify such an application, we integrated a single microsphere into a PDMS-based microfluidic valve, and the fabricated microvalve resulted in stable operations relative to pH change.

Original languageEnglish
Pages (from-to)321-328
Number of pages8
JournalSensors and Actuators, A: Physical
Volume134
Issue number2
DOIs
Publication statusPublished - 2007 Mar 15

Fingerprint

Microspheres
microbalances
Hydrodynamics
hydrodynamics
Fabrication
fabrication
Polydimethylsiloxane
pipettes
actuation
swelling
Photopolymerization
Microfluidics
Swelling
glass
Glass
Substrates
baysilon

Keywords

  • Hydrogel
  • Microvalve
  • pH-responsive microsphere
  • Photopolymerization

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Instrumentation

Cite this

Hydrodynamic fabrication and characterization of a pH-responsive microscale spherical actuating element. / Kim, DuckJoong; Kim, SungRak; Park, JiYoung; Baek, JuYeoul; Kim, SeonJeong; Sun, Kyung; Lee, TaeSoo; Lee, Sang Hoon.

In: Sensors and Actuators, A: Physical, Vol. 134, No. 2, 15.03.2007, p. 321-328.

Research output: Contribution to journalArticle

Kim, DuckJoong ; Kim, SungRak ; Park, JiYoung ; Baek, JuYeoul ; Kim, SeonJeong ; Sun, Kyung ; Lee, TaeSoo ; Lee, Sang Hoon. / Hydrodynamic fabrication and characterization of a pH-responsive microscale spherical actuating element. In: Sensors and Actuators, A: Physical. 2007 ; Vol. 134, No. 2. pp. 321-328.
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