2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Photochemical Alteration of the Stability of Polymer Nano-Agglomerates

M. Seipenbusch, S. Rothenbacher, A.P. Weber, J. Salas-Vicente, A.M. Braun and G. Kasper
University of Karlsruhe, DE

photochemistry, aerosol, agglomerate, stability

Interparticle adhesion in the nano-regime leads to undesired stable agglomerates in particulate products. On one hand, the high surface energies of nanoparticles favor the reduction of overall surface area by maximization of the number of contacts as well as chemical bond formation and sintering. On the other hand, the small dimensions of the particles make deagglomeration using shear fields or inertia-based methods like sonication inefficient. In other cases of application however, strong interparticle contacts are desired. The aim of this work was thus to gain control over the strength of interparticle bonds in polymer nanoagglomerates as a decisive product parameter. As a model system, polystyrene (PS) particles were chosen. The alteration of the interparticle bond strength was achieved by photochemically induced reactions, changing the chemistry of the particle surface.

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