Abstract：The size of nano-particle was measured using surface area and porosity analyzer by means of measuring the stack pore size around the nano-particles. The results showed that there are linear relationship between the stack pore size and the particle size with size from 30 to 70 nm, the results of particle size can be read out precisely form the working curve. Especially for the particles with size small than 100 nm, the measuring accuracy of this method reach to 0.2 nm, and the results have statistical significance.

Keywords: nano-particle; particle size measurement; surface area; porosity analyzer