Nanobubbles, known for their distinctive physicite and chemical properties, have been successfully applied in various fields. However, the basic properties of nanobubbles formed by gas hydrate dissociation remain poorly understood. In this work, a series of experiments are conducted to investigate the physicochemical properties and stability of CO and CH nanobubbles produced by hydrate dissociation. The results indicate that the average size of CO and CH nanobubbles derived from hydrate decomposition slightly increases as the static time prolongs, exhibiting the excellent stability of nanobubbles. Similar to macroscopic bubbles, the size variation of both nanobubble types exhibits a positive correlation with temperature. The absolute value of the surface zeta potential of the CH nanobubbles decreases with time, while the opposite is true for the CO nanobubbles. Moreover, the expansion in size for both nanobubble types demonstrates a negative correlation with increasing pH, whereas the zeta potential displays a positive correlation with pH. We observed that nanobubble potential is substantially influenced by metal cations within the solution, and the potential effect of CO and CH nanobubbles was preliminarily discussed by settlement tests as well. These findings may serve as valuable references for future assessments of the role of nanobubbles in reservoir seepage processes and the advancement of gas hydrate technology.

中文翻译：

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天然气水合物分解产生的CO2和CH4纳米气泡的物理化学性质比较


纳米气泡以其独特的物理性质和化学性质而闻名，已成功应用于各个领域。然而，人们对天然气水合物解离形成的纳米气泡的基本性质仍然知之甚少。在这项工作中，进行了一系列实验来研究水合物解离产生的CO和CH纳米气泡的物理化学性质和稳定性。结果表明，随着静置时间的延长，水合物分解产生的CO和CH纳米气泡的平均尺寸略有增加，表现出纳米气泡优异的稳定性。与宏观气泡类似，两种纳米气泡的尺寸变化均与温度呈正相关。 CH纳米气泡表面zeta电位的绝对值随着时间的推移而减小，而CO纳米气泡则相反。此外，两种纳米气泡类型的尺寸膨胀均与 pH 值的增加呈负相关，而 zeta 电位则与 pH 值呈正相关。我们观察到纳米气泡电势很大程度上受溶液中金属阳离子的影响，并且通过沉降试验也初步讨论了CO和CH纳米气泡的电势影响。这些发现可为未来评估纳米气泡在储层渗流过程中的作用以及天然气水合物技术的进步提供有价值的参考。