Nanoprecipitation of cellulose acetate using solvent/nonsolvent mixtures as dispersive media

Martin R. Kulterer, Martin Reischl*, Victoria E. Reichel, Silvo Hribernik, Ming Wu, Stefan Köstler, Rupert Kargl, Volker Ribitsch

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

An efficient nanoprecipitation technique using good cellulose acetate (CA) solvents as modifier for the dispersive media (nonsolvent) was developed for the generation of CA nanoparticles. Addition of tetrahydrofuran (THF) to the nonsolvent leads to smaller particles than obtained with pure water or standard stabilizing agents like surfactants and block copolymers. Sonication, efficient agitation, and optimization of process parameters like temperature, THF content, pH value and stirrer velocity reduces nanoparticle sizes and improves substrate recoveries. With the optimized process, spherical nanoparticles of 60. nm with 87% yield can be generated reproducibly. This is obtained by addition of good polymer solvents (tetrahydrofuran (THF)) to a nonsolvent (water) and applying those mixtures as nonsolvents for nanoprecipitation. Main theoretical models in discussion are not able to explain sufficiently the particle size reduction by the addition of a good polymer solvent to the nonsolvent. CA nanoparticles can be used to produce ultrathin layers deposited onto positively charged surfaces. Possible applications are seen in surface science (e.g. surface modifications and surface functionalization of CA foils and membranes).

Original languageEnglish
Pages (from-to)23-29
Number of pages7
JournalColloids and Surfaces / A
Volume375
Issue number1-3
DOIs
Publication statusPublished - 5 Feb 2011

Keywords

  • Cellulose acetate
  • Nanoparticle
  • Nanoprecipitation mechanism
  • Poly-l-lysine
  • Solvent displacement
  • Ultrathin layer

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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