Journal
APPLIED SURFACE SCIENCE
Volume 571, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151188
Keywords
Wettability contrast; Candle soot; Filter paper; Plasmonic droplet assay
Categories
Funding
- Manipal Academy of Higher Education, FIST program of the Government of India [SR/FST/PSI-174/2012]
- Department of Science and Technology, Government of India [IDP/BDTD/20/2019]
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A facile and cost-effective method was developed to create superhydrophobic surfaces onto a superhydrophilic commercial paper for the application of droplet splitting. The technique allows for high throughput screening, microfluidic bioassays, and medical diagnosis.
A facile and cost-effective method was developed to create superhydrophobic surfaces onto a superhydrophilic commercial paper for the application of droplet splitting of microliter droplets into nano and sub-nano-liter droplets. The high wettability contrast of nearly 180 degrees between the superhydrophobic region created via candle soot coated onto the patterned poly (dimethylsiloxane) and the paper causes the self-partitioning of a 1 mu l droplet while sliding through the surface with a speed ranging from 0.001 to 7.3 mm/s. Additionally, the splitting of the droplet demonstrated for mu l droplets of surface tension ranging from 72 mN/m to 38.5 mN/m. The plasmonic droplet assay for surface-enhanced Raman spectroscopy was fabricated via in-situ reduction of Ag nanoparticles onto the superhydrophilic region. The Raman scattering studies of methyl orange using the prepared substrates exhibit a limit of detection of 670 pM. Further, by using methyl orange as a probe molecule, selective detection of Hg2+ ions up to a concentration of 100 pM in nanoliter droplet volume is demonstrated. It is envisaged that these cost-effective plasmonic nanoliter droplet assays created via patterned superhydrophilicsuperhydrophobic can find applications in high throughput screening, microfluidic bioassays, medical diagnosis.
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