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Ultrasound micro-molding technology has proved useful in processing  biodegradable polymers with minimum material loss. This makes this  technology particularly suitable for the production of biomedical  microdevices. The use of silica (SiO2) nanoparticles is also  interesting because of advantages like low cost and enhancement of final  properties. Evaluation of the capacity to create a homogeneous  dispersion of particles is crucial. Specifically, this feature was  explored taking into account micro- and nano-sized silica particles and a  biodegradable polyester derived from 1,9-nonanodiol and azelaic acid as  a matrix. Results demonstrated that composites could be obtained with  up to 6 wt. % of silica and that no degradation occurred even if  particles were functionalized with a compatibilizer like (3-aminopropyl)  triethoxysilane. Incorporation of nanoparticles should have a great  influence on properties. Specifically, the effect on crystallization was  evaluated by calorimetric and optical microscopy analyses. The overall  crystallization rate was enhanced upon addition of functionalized silica  nanospheres, even at the low percentage of 3 wt. %. This increase was  mainly due to the ability of nanoparticles to act as heterogeneous  nuclei during crystallization. However, the enhancement of the secondary  nucleation process also played a significant role, as demonstrated by  Lauritzen and Hoffmann analysis

Dispersion of Functionalized Silica Micro- and Nanoparticles into Poly(nonamethylene Azelate) by Ultrasonic Micro-Molding