在电解质溶液中的离子特异性泡凝聚力学
Afsal Chakkam Palliyalil1, Ananthan Mohan1, Susmita Dash1
1Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, India.
Langmuir : the ACS journal of surfaces and colloids
|December 22, 2023
概括
溶解的离子显著影响泡凝聚时间,影响工业过程. 这项研究揭示了NaCl和Na2SO4等电解质如何通过影响薄膜排水动力学来减缓凝聚.
科学领域:
- 流体动力学 流体动力学
- 合体和表面科学科学
- 电化学 电化学 电化学
背景情况:
- 泡凝聚在工业应用中至关重要,例如泡漂浮和热管理.
- 液相中溶解离子的存在影响了气泡凝聚力学.
- 了解泡和基板之间的薄电解质膜行为是控制凝聚的关键.
研究的目的:
- 研究电解质度和离子类型对薄膜排水和泡凝聚的影响.
- 开发一个包含表面张力梯度和电双层 (EDL) 效应的数值模型.
- 阐明马兰戈尼应力和EDL在确定泡凝聚时间尺度中的作用.
主要方法:
- 基于薄膜方程的数值模型的开发.
- 包括依赖离子度的表面张力梯度和EDL.
- 分析马兰戈尼应力和EDL对流体排水动态的影响.
主要成果:
- 某些电解质 (NaCl,Na2SO4,NaI) 减缓了泡凝聚,而其他电解质 (HCl,HNO3) 的作用很小.
- 电解质度增加增加了马兰戈尼的应力,减缓了排水,促进了坑的形成.
- EDL和范德瓦尔斯力决定了水友基板上的最终薄膜动力学,导致稳定的电解质层.
- 较高的NaCl度降低了稳定膜厚度;Na2SO4在较小的厚度下稳定,这是由于离子价值.
结论:
- 电解质的组成和度是控制泡凝聚时间的关键因素.
- 马兰戈尼应力和EDL相互作用在薄电解质薄膜的水力动力学中起着重要作用.
- 这些发现为控制各种工业过程中的泡凝聚提供了洞察力.
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