Surfactant free fabrication of polymeric nanoparticles by combined liquid-liquid phase separation and solvent/nonsolvent mixing technology

Xiong, J, Liu, X, Sawant, P, Chen, S, Chung, T and Pramoda, K 2004, 'Surfactant free fabrication of polymeric nanoparticles by combined liquid-liquid phase separation and solvent/nonsolvent mixing technology', Journal of Chemical Physics, vol. 121, no. 24, pp. 12626-12631.


Document type: Journal Article
Collection: Journal Articles

Title Surfactant free fabrication of polymeric nanoparticles by combined liquid-liquid phase separation and solvent/nonsolvent mixing technology
Author(s) Xiong, J
Liu, X
Sawant, P
Chen, S
Chung, T
Pramoda, K
Year 2004
Journal name Journal of Chemical Physics
Volume number 121
Issue number 24
Start page 12626
End page 12631
Total pages 6
Publisher American Institute of Physics
Abstract It is generally agreed that, in most cases, surfactants are required to obtain stable polymeric nanoparticle dispersions. Here, we report a method which can be used to produce surfactant free yet stable polymeric nanoparticle dispersions. This method is based on explored mechanism of selective solvation of nanoparticles and EPD (electron pair donor)/EPA (electron pair acceptor) complexes formed among solvent and nonsolvent molecules. Using polyimide P84 (copolyimide 3,3' 4,4'-benzophenone tetracarboxylic dianhydride and 80%methylphenylenediamine+20%methylenedianiline) as the model polymer, this mechanism was realized through a combined liquid-liquid phase separation and solvent/nonsolvent mixing technology. Surfactant-free polyimide nanoparticles (<100nm) were produced. Experimental details and principles of this technology were given based on the ternary diffusion, the liquid-liquid phase separation and the advanced nucleation and growth theory. Two types of methods [denoted as the forward titration method and the backward titration (BT) method] were examined. It was found that the BT method is extremely helpful to prepare polyimide nanoparticles (<100nm). As another important aspect, explored stabilization mechanism of the resultant nanoparticle dispersions was supported by the comparative experiments, implying that selective solvation of nanoparticles and EPD/EPA complexes may play key roles in stabilization.
Subject Physical Chemistry not elsewhere classified
DOI - identifier 10.1063/1.1808419
Copyright notice © 2004 American Institute of Physics
ISSN 0021-9606
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