3 years ago

On-Demand Capture and Release of Organic Droplets Using Surfactant-Doped Polypyrrole Surfaces

On-Demand Capture and Release of Organic Droplets Using Surfactant-Doped Polypyrrole Surfaces
Youhua Jiang, Wei Xu, Eui-Hyeok Yang, Chang-Hwan Choi, Anthony Palumbo, Jian Xu
In this paper, we demonstrate the controlled capture and release of dichloromethane (DCM) droplets on dodecylbenzenesulfonate-doped polypyrrole (PPy(DBS)) surfaces in an aqueous environment. The droplets captured on oxidized PPy(DBS) surfaces were released on-demand via a reduction process at ∼0.9 V, with controlled release time and droplet morphology. The release time of an entire droplet (2 ± 1 μL) was proportional to the thickness of the PPy(DBS) coating, increasing from 11.5 to 26.3 s for thicknesses ranging from 0.6 to 5.1 μm. The droplet-release time was also affected by the redox voltages, and among the tested redox voltages, the fastest release was achieved at −0.9/0.1 V. The PPy(DBS) surfaces with larger thicknesses were more durable for the droplet capture and release. The droplets were more rapidly released from PPy(DBS) surfaces with increased surface roughness ratios, such as 6.0 s on a micropillared surface and 10.3 s on a meshed surface, as compared to 14.6 s on the 1.8 μm thick PPy(DBS) surfaces coated on frosted-glass substrates (i.e., with random microstructures). The release of a single droplet was achieved by increasing the underwater oleophobicity of PPy(DBS) surface via O2 plasma treatment.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b03787

DOI: 10.1021/acsami.7b03787

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.