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
Pages117-119
Number of pages3
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
CountryUnited States
CitySan Antonio
Period26/10/201430/10/2014

Keywords

  • Nanocellulose
  • Photo-switching
  • Superhydrophobic

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    Hoshian, S., Jokinen, V., Hjort, K., Ras, R. H. A., & Franssila, S. (2014). Micro-writing under water droplet using photo-switchable titanium oxide on nanocellulose coated micro-hoodoos. In 18th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2014 (pp. 117-119)