Effect of salts (NaCl and CaCl₂) on dynamic bubble nucleation on hydrophobic bitumen and silanated glass in air‐supersaturated water was examined using an autoclave at air saturation pressure of 700 kPa and temperature of 80°C. The results showed that at a low salt concentration, there was virtually no difference in the sizes of bubbles nucleated on the surface (0.06‐0.2 cm in diameter), as compared to the cases without salt addition. At a higher salt concentration (0.2 M CaCl₂, or 0.3 M NaCl), the size of bubbles nucleated on the surfaces reduced drastically (more than 10‐fold smaller), with the surface being entirely frosted with small bubbles lined up neatly. The observed sizes of surface bubbles were up to more than 3600 times larger for the cases without salts, and 600 times larger at the high salt concentrations, than the critical equilibrium bubble diameter under given test conditions (~328 nm). Possible reasons for the observed phenomena were briefly discussed.

中文翻译：

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盐对空气过饱和水中疏水表面动态气泡成核的影响

在空气饱和压力为700 kPa，温度为80°C的高压釜中，研究了盐（NaCl和CaCl ₂）对疏水性沥青和硅烷化玻璃中气泡动态成核的影响。结果表明，与不加盐的情况相比，在低盐浓度下，表面成核的气泡大小（直径为0.06-0.2 cm）几乎没有差异。在更高的盐浓度下（0.2 M CaCl ₂，或0.3 M NaCl），表面上成核的气泡大小急剧减小（小10倍以上），表面完全被磨砂，整齐地排列着小气泡。在给定的测试条件下（〜328 nm），所观察到的表面气泡的大小比不含盐的临界气泡直径大3600倍，而在没有盐的情况下则高600倍。简要讨论了观察到的现象的可能原因。