Surfactant free fabrication of polyimide nanoparticles

Xiong, J. Y.; Liu, X. Y.; Chen, S. B.; Chung, T. S.
December 2004
Applied Physics Letters;12/6/2004, Vol. 85 Issue 23, p5733
Academic Journal
Polyimide nanoparticles are fabricated using a combined liquid–liquid phase separation and solvent/nonsolvent mixing technology. This technology allows us to produce stable polyimide nanoparticles with tunable size without any surfactants. Selective solvation and electron pair donor/electron pair acceptor interaction are employed to stabilize nanoparticles. The formation of polyimide nanoparticles is governed by a nucleation-dominated 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 is found extremely useful in the fabrication of sub-50-nm polyimide nanoparticles.


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