抗菌成分としての銀錯体 R_p [Ag_q (S_2O_3)_r] (R=Na, K)の熱安定性 Thermal Stability of Silver Thiosulfato Complex R_p [Ag_q (S_2O_3)_r] (R=Na, K)
Anti-microbial materials were synthesized with silver thiosulf ato complex R<sub>p</sub>[Ag<sub>q</sub>(S<sub>2</sub>O<sub>3</sub>)<sub>r</sub>](R=Na, K) on silica gel. Thermal stability of the materials was better with a potassium salt than a sodium salt. It was suggested that the change of cation "R" of the complexes from Sodium to Potassium resulted in thermal stability against oxidation after decomposition of the complexes. Among several cations for the complex, potassium was the most suitable. Potassium salts of the complex K<sub>p</sub>[Ag<sub>q</sub>(S<sub>2</sub>O<sub>3</sub>)<sub>r</sub>] were synthesized with various ratios of r/q from 1 to 8. With various ratios of r/q, each sodium or potassium salt of the complex was kneaded with resin, and the color difference value Δ<i>E</i> of the surface against natural resin was measured. TG-DTA measurements showed minimum thermal stability at r/q=4 and maximum at 6. Color measurements showed lower Δ<i>E</i> values with K salts than Na salts. The Δ<i>E</i> values of both salts showed peaked at r/q=4 and decreased at 6. Results of thermal stability TG-DTA measurements showed an agreement with the result of color measurements. It was thus suggested that the complex of potassium salt with an S<sub>2</sub>O<sub>3</sub>/Ag ratio of "6" had superior properties among the complexes for thermal stability against kneading treatment with resin. The chemical composition of the complex was K<sub>11</sub>[Ag(S<sub>2</sub>O<sub>3</sub>)<sub>6</sub>].
- 表面技術 = The Journal of the Surface Finishing Society of Japan
表面技術 = The Journal of the Surface Finishing Society of Japan 47(1), 42-45, 1996-01
The Surface Finishing Society of Japan