Rapid Patterning of PDMS Microfluidic Device Wettability Using Syringe-Vacuum-Induced Segmented Flow in Nonplanar Geometry

Chang-Hyung Choi; Hyomin Lee; David A Weitz

doi:10.1021/acsami.7b17132

Rapid Patterning of PDMS Microfluidic Device Wettability Using Syringe-Vacuum-Induced Segmented Flow in Nonplanar Geometry

ACS Appl Mater Interfaces. 2018 Jan 31;10(4):3170-3174. doi: 10.1021/acsami.7b17132. Epub 2018 Jan 19.

Authors

Chang-Hyung Choi^{1

2}, Hyomin Lee^{1

3}, David A Weitz¹

Affiliations

¹ John A. Paulson School of Engineering and Applied Sciences, Harvard University , Cambridge, Massachusetts 02138, United States.
² Division of Cosmetic Science and Technology, Daegu Haany University , Gyeongsan 38610, Republic of Korea.
³ Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH) , Pohang 37673, Republic of Korea.

PMID: 29336541
DOI: 10.1021/acsami.7b17132

Abstract

We present a simple and rapid method to spatially pattern the surface wetting properties of PDMS microfluidic devices by layer-by-layer (LbL) deposition of polyelectrolytes using syringe-vacuum-induced segmented flow in nonplanar geometry. Our technique offers selective surface modification in microfluidic chips with multiple flow-focusing junctions, enabling production of monodisperse double- and triple-emulsion drops.

Keywords: emulsions; layer-by-layer deposition; microfluidics; segmented flow; surface modification.