Micro-writing under water droplet using photo-switchable titanium oxide on nanocellulose coated micro-hoodoos

Sasha Hoshian*, Ville Jokinen, Klas Hjort, Robin H A Ras, Sami Franssila

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

In this work we develop fast and locally photo-switching transition between rolling state (Cassie-Baxter (CB)) and sticky state (Wenzel (W)) using photo-switchable titanium dioxide (TiO2) deposited by atomic layer deposition (ALD). It takes 1 min of UV exposure for switching from CB to W and 5 min of dark storage in oven (200°C) to recover the surface energy. We use crystal nanocellulose (CNC) on T-shaped micro-pillars (micro-hoodoos [1] Figure1-j) to make hierarchical structures. Photo-masked UV exposure causes the locally transition from CB to W.

Original languageEnglish
Title of host publication18th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2014
PublisherChemical and Biological Microsystems Society (CBMS)
Pages117-119
Number of pages3
ISBN (Print)9780979806476
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Miniaturized Systems for Chemistry and Life Sciences - San Antonio, United States
Duration: 26 Oct 201430 Oct 2014
Conference number: 18

Conference

ConferenceInternational Conference on Miniaturized Systems for Chemistry and Life Sciences
Abbreviated titleMicroTAS
Country/TerritoryUnited States
CitySan Antonio
Period26/10/201430/10/2014

Keywords

  • Nanocellulose
  • Photo-switching
  • Superhydrophobic

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