[9a-Z24-1~10] 【CS.7】 Code-sharing Session of 7.4 & 9.5

[9a-Z24-6] Correlation between particle size and electric double layer at solid-liquid interface dependence of pH for Au nanocolloids

〇Ayuka Nasu¹, Naoki Kanayama^2,3, Satoshi Ogawa¹, Shinya Yagi^1,4, Eiji Ikenaga^1,4 (1.Nagoya Univ., 2.RIKEN, 3.Shinshu Univ., 4.IMaSS, Nagoya Univ.)

Keywords:nanoparticles, HAXPES, electric double layer

Recently, Au nanocolloids attract many researchers due to a remarkable property. In this study, we have investigated the correlation between the particle size, the value of pH (isoelectric point) and the electric double layer at the solid-liquid interface. The Au nanocolloids were prepared using various pH electrolytes, and evaluated by the electrophoresis, UV-vis, and a hard X-ray photoelectron spectroscopy. Au nanocolloids at low pH is unstable compared with high pH, because the zeta potential is small and the particle size is increasing up. From these results of experimental and calculated of interfacial potential, pH 2.6 was observed the most unstable. In summary, we proposed that pH 2.6 is very close to the isoelectric point.