Layer-by-layer assembled hydrophobic coatings for cellulose nanofibril films and textiles, made of polylysine and natural wax particles

Nina Forsman, Alina Lozhechnikova, Alexey Khakalo, Leena-Sisko Johansson, Jari Vartiainen, Monika Österberg

Research output: Contribution to journalArticleScientificpeer-review

40 Citations (Scopus)
329 Downloads (Pure)

Abstract

Herein we present a simple method to render cellulosic materials highly hydrophobic while retaining their breathability and moisture buffering properties, thus allowing for their use as functional textiles. The surfaces are coated via layer-by-layer deposition of two natural components, cationic poly-l-lysine and anionic carnauba wax particles. The combination of multiscale roughness, open film structure, and low surface energy of wax colloids, resulted in long-lasting superhydrophobicity on cotton surface already after two bilayers. Atomic force microscopy, interference microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy were used to decouple structural effects from changes in surface energy. Furthermore, the effect of thermal annealing on the coating was evaluated. The potential of this simple and green approach to enhance the use of natural cellulosic materials is discussed.
Original languageEnglish
Pages (from-to)392-402
Number of pages11
JournalCarbohydrate Polymers
Volume173
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Layer-by-layer assembly
  • Poly-l-lysine
  • Carnauba wax
  • Textile
  • Cellulose nanofibril films
  • Hydrophobicity

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