Competitive interactions and controlled release of a natural antioxidant from halloysite nanotubes

József Hári, Ádám Gyürki, Márk Sárközi, Eniko Földes, Béla Pukánszky

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Halloysite nanotubes used as potential carrier material for a controlled release stabilizer in polyethylene were thoroughly characterized with several techniques including the measurement of specific surface area, pore volume and surface energy. The high surface energy of the halloysite results in the strong bonding of the additive to the surface. Dissolution experiments carried out with eight different solvents for the determination of the effect of solvent characteristics on the amount of irreversibly bonded quercetin proved that adsorption and dissolution depend on competitive interactions prevailing in the system. Solvents with low polarity dissolve only surplus quercetin adsorbed in multilayers. Polyethylene is a very apolar polymer forming weak interactions with every substance; quercetin dissolves into it from the halloysite surface only above a critical surface coverage. Stabilization experiments confirmed that strong adhesion prevents dissolution and results in limited stabilization efficiency. At larger adsorbed amounts better stability and extended effect were measured indicating dissolution and controlled release.

Original languageEnglish
Pages (from-to)123-129
Number of pages7
JournalJournal of colloid and interface science
Volume462
DOIs
Publication statusPublished - Jan 15 2016

Keywords

  • Controlled release
  • Halloysite
  • Interaction
  • Nanotube
  • Natural antioxidant
  • Quercetin

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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