Microstructured Surfaces for Reducing Chances of Fomite Transmission via Virus-Containing Respiratory Droplets

Seok Kim, Woo Young Kim, Sang Hoon Nam, Seunghang Shin, Su Hyun Choi, Do Hyeog Kim, Heedoo Lee, Hyeok Jae Choi, Eungman Lee, Jung Hyun Park, Inho Jo, Nicholas X. Fang, Young Tae Cho

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Evaporation-induced particle aggregation in drying droplets is of significant importance in the prevention of pathogen transfer due to the possibility of indirect fomite transmission of the infectious virus particles. In this study, particle aggregation was directionally controlled using contact line dynamics (pinned or slipping) and geometrical gradients on microstructured surfaces by the systematic investigation of the evaporation process on sessile droplets and sprayed microdroplets laden with virus-simulant nanoparticles. Using this mechanism, we designed robust particle capture surfaces by significantly inhibiting the contact transfer of particles from fomite surfaces. For the proof-of-concept, interconnected hexagonal and inverted pyramidal microwall were fabricated using ultraviolet-based nanoimprint lithography, which is considered to be a promising scalable manufacturing process. We demonstrated the potentials of an engineered microcavity surface to limit the contact transfer of particle aggregates deposited with the evaporation of microdroplets by 93% for hexagonal microwall and by 96% for inverted pyramidal microwall. The particle capture potential of the interconnected microstructures was also investigated using biological particles, including adenoviruses and lung-derived extracellular vesicles. The findings indicate that the proposed microstructured surfaces can reduce the indirect fomite transmission of highly infectious agents, including norovirus, rotavirus, or SARS-CoV-2, via respiratory droplets.

Original languageEnglish
Pages (from-to)14049-14060
Number of pages12
JournalACS Nano
Volume15
Issue number9
DOIs
StatePublished - 28 Sep 2021

Bibliographical note

Publisher Copyright:
© 2021 The Authors. Published by American Chemical Society

Keywords

  • directional particle aggregation
  • fomite transmission
  • microstructured surfaces
  • nanoparticles
  • respiratory droplets
  • virus particles

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