Peptization

Peptization

Peptization is a technique used in nanoparticle synthesis to make a large grouping of particles split into many primary particles. This is done by changing the surface properties, applying a charge, or by adding a surfactant.

In the synthesis of titania (titanium dioxide) nanoparticles, peptization involves adsorption of negative tetramethylammonium hydroxide (TEAH) molecules on the titania surface. This causes the surface to become negatively charged. Electrostatic repulsion of the primary particles in the agglomerated titania breaks up the agglomerate into primary particles. [Y. Li, T. J. White and S. H. Lim, “Low-temperature synthesis and microstructural control of titania nano-particles”, J. Solid State Chem. Vol 177, 1372-1381 (2004).]

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