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.