Micro-patterns on nanocellulose films and paper by photo-induced thiol–yne click coupling: a facile method toward wetting with spatial resolution

Jiaqi Guo, Ilari Filpponen, Leena Sisko Johansson, Stefan Heiβler, Lei Li, Pavel Levkin, Orlando J. Rojas*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

We report a facile approach to tailor the wettability of ligno-cellulosic substrates via photo-induced thiol–yne click coupling. First, cellulosic surfaces were functionalized with 4-pentynoic acid to introduce terminal alkyne moieties for the subsequent photo-induced coupling in heterogeneous phase. Next, the (primed) surfaces were reacted with various thiol-containing molecules to systematically tailor the surface energy. Finally, the method was applied to nanocellulose films and paper to develop micro-patterned surfaces via UV lithography, endowing the substrates with thin hydrophilic channels (~ 250 μm thickness) and hydrophobic boundaries between neighboring water droplets, as small as 100 μm in width. Overall, we propose thiol-click as a facile method toward spatially-resolved wetting that enables paper-based electronics in smart labels and point-of-care bioplatforms.

Original languageEnglish
Pages (from-to)367–375
Number of pages9
JournalCellulose
Volume25
Issue number1
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Micro-patterns
  • Nanocellulose
  • Photo-induced thiol–yne reaction
  • Surface functionalization

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