In this study, the surfaces of NaCl particles were modified with metal films using the polygonal barrel-sputtering me thod. When Pt was sputtered on NaCl particles, the individual particles changed from white to metallic. Characteriza tion of the treated samples indicated that thin Pt metal films were uniformly deposited on the NaCl particles. Immer sion of the treated NaCl particles in water revealed that they floated to the surface of the water with the increase in the immersion time, although their original cubic shapes remained unchanged. The floating phenomenon of the Pt-coated NaCl particles, as mentioned above, suggests that NaCl was dissolved by the permeation of water through invisible de fects such as grain boundaries in the Pt films, leading to the formation of hollow particle-like materials. It should be noted that uniform film deposition on the NaCl particles could also be achieved by sputtering with Au or Cu. Based on the obtained results, our sputtering method allows uniform surface modification of water-soluble and water-reactive powders that cannot be treated by conventional wet process using water.
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