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Author

Takayama, Shuichi
Cell and Microfluidics Lab
Research Interests
  • Bio-MEMS and Microfluidics

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Patchy Surfaces Stabilize Dextran-Polyethylene Glycol Aqueous Two-Phase System Liquid Patterns

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Title
Patchy Surfaces Stabilize Dextran-Polyethylene Glycol Aqueous Two-Phase System Liquid Patterns
Author
Kojima, TaisukeTakayama, Shuichi
Keywords
Aqueous two phase system; Carboxylic acid groups; Chemical heterogeneities; Fluorescent measurements; Homogeneous surfaces; Polydimethylsiloxane PDMS; Polyethylene glycol (PEG); Primary amine groups
Issue Date
201305
Publisher
AMER CHEMICAL SOC
Citation
LANGMUIR, v.29, no.18, pp.5508 - 5514
Abstract
This paper analyzes surface chemistry effects to stably pattern aqueous two-phase system (ATPS) droplets on chemically modified poly(dimethylsiloxane) (PDMS). Polyethylene glycol (PEG) and dextran (DEX) are used as phase-forming polymers for the ATPS. PDMS surface modifications studied include primary amine groups, carboxylic acid groups, and neutral polymer surfaces. The PDMS surfaces were characterized by fluorescent measurement, water and DEX contact angle measurements, and X-ray photoelectron spectroscopy (XPS) analysis to confirm surface properties. While homogeneous surfaces of different functional groups affect DEX droplet pinning somewhat, the most stable patterns were realized using surfaces with chemical heterogeneity. Arbitrary DEX solution patterning was achieved on a chemically patchy surface.
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DOI
http://dx.doi.org/10.1021/la400580q
ISSN
0743-7463
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