Diffusion and tortuosity in porous functionalised calcium carbonate - Abstract

Calcium carbonate can be 'functionalized' by use of etching agents such as phosphoric acid to create inter- and intra-particle porosity with a range of morphologies. Functionalized calcium carbonate has potential for use as a carrier for the delayed release of actives, such as drugs, plant protection chemicals, and food additives such as flavors. The drug or flavor is released slowly by permeation and diffusion.

More