This document is not contractually binding under any circumstances - © 2012 HORIBA Instruments, Inc. Introduction A platinum colloid is a suspension with a dispersed phase consisting of platinum particles between 1 nm – 1 ìm evenly dispersed in a continuous phase, in this case water. The sample can be considered to be on the nanoparticle scale if the size of the dispersed phase particles is between 1-100 nm. Platinum colloidal particles are stabilized by coating their surfaces with high polymers to form 3-D barriers or using the reduction potential of platinum to impose repulsive forces between the particles. Platinum nanoparticles have found applications in catalysts for treating automobile exhaust gas and fuel cell electrodes. Other applications of platinum nanoparticles include

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