Colgate-Palmolive Company 1 article published in JoVE Chemistry Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments Viktor Dubovoy1, Ravi Subramanyam1, Michael Stranick1, Laurence Du-Thumm1, Long Pan1 1Colgate-Palmolive Company An ultrafine aluminum hydroxide nanoparticle suspension was prepared via the controlled titration of [Al(H2O)]3+ with L-arginine to pH 4.6 with and without cage-effect confinement within mesoporous channels of MCM-41.