Preferential solvation stabilization for hydrophobic polymeric nanoparticle fabrication

Jun Ying Xiong, Xiang Yang Liu*, Shing Bor Chen, Tai Shung Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Preferential solvation of polymer molecules and strong EPD-EPA (EPD, electron pair donor; EPA, electron pair acceptor) interaction between solvent and nonsolvent molecules were found to be of great significance in the fabrication of two kinds of aromatic polyimide (AP) nanoparticles. Surfactant free yet stable AP nanoparticles were prepared using a liquid-liquid phase separation method. The stability of the AP nanoparticles can be achieved by the solvation multilayer resulting from a solvation stabilization chain in the form of nonsolvent → solvent → AP (a → b denotes that component b is solvated by component a). The significance of this stabilization chain was identified by many comparative experiments using different types of molecular probes. On the other hand, the formation of AP nanoparticles was found to be governed by a nucleation process and therefore the particle size is controlled by the nucleation rate. A very high level of supersaturation can be attained under the intensive local motions induced by ultrasound, resulting in a very high nucleation rate. This effect was found to be extremely useful in the fabrication of sub-50 nm AP nanoparticles.

Original languageEnglish (US)
Pages (from-to)13877-13882
Number of pages6
JournalJournal of Physical Chemistry B
Issue number29
StatePublished - Jul 28 2005
Externally publishedYes

ASJC Scopus subject areas

  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry


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