Analytical Chemistry
Analytical Chemistry
5 years ago

Trace Material Capture by Controlled Liquid Droplets on a Superhydrophobic/Hydrophilic Surface

Trace Material Capture by Controlled Liquid Droplets on a Superhydrophobic/Hydrophilic Surface
Naoya Kawamura, Seimei Shiratori, Kenta Fukada
A liquid droplet in contact with a superhydrophobic surface can be used to collect dissolved trace materials after evaporating the solvent. This process effect enhances detection limits, but a liquid droplet easily rolls off a superhydrophobic surface. Keeping it at a specific collecting spot area is challenging. Here the means for controlling and capturing a liquid droplet on a superhydrophobic surface is demonstrated. To induce a liquid droplet to a collecting spot, its rolling direction was controlled by two superhydrophobic fabric guides. The liquid droplet was then captured by hydrophilic polymer and hydrophilic nanoparticles at the measuring spot. After removing the solvent, the trace compounds were evaluated with a colorimetric analysis visible to the naked eye.

Publisher URL: http://dx.doi.org/10.1021/acs.analchem.7b02369

DOI: 10.1021/acs.analchem.7b02369

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