Chen Jing, Peng Jiaoyu, Wang Xingpeng, Dong Yaping, Li Wu
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, 810008 Xining, Qinghai, People's Republic of China.
Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, 810008 Xining, People's Republic of China.
R Soc Open Sci. 2019 Jun 26;6(6):181862. doi: 10.1098/rsos.181862. eCollection 2019 Jun.
Measurements of the solubility and metastable zone width (MZW) of borax decahydrate in sodium carbonate and sodium hydroxide aqueous were obtained. The onsets of nucleation were detected by the turbidity technique with the temperature range from 285 to 315 K. The results showed that the solubility of borax gradually decreased and the MZW broadened with the mass percentage of sodium carbonate increasing from 0% up to 9.22%. Correspondingly, the solubility and MZW had the same trend with the addition of sodium hydroxide. Meanwhile, the nucleation parameters of borax were determined and analysed to explain the trends obtained. Applying the classical three-dimensional nucleation theory approach, it was found that the addition of carbonate and hydroxide ions led to the values of solid-liquid interfacial energy () increasing, which indicated the CO and OH ions adsorbed on the nuclei but suppressed nucleation rate.
测定了十水硼砂在碳酸钠和氢氧化钠水溶液中的溶解度及介稳区宽度（MZW）。通过浊度技术在285至315 K的温度范围内检测成核起始点。结果表明，随着碳酸钠质量分数从0%增加到9.22%，硼砂的溶解度逐渐降低，介稳区宽度变宽。相应地，加入氢氧化钠时，溶解度和介稳区宽度也呈现相同趋势。同时，确定并分析了硼砂的成核参数以解释所得到的趋势。应用经典的三维成核理论方法发现，碳酸根和氢氧根离子的加入导致固液界面能（）值增加，这表明CO 和OH离子吸附在晶核上但抑制了成核速率。
