| 邱玉清1， 王东祥1,2,*.黏度和电荷对声悬浮二氧化硅液滴中颗粒分布和屈曲的影响[J].轻工机械,2025,43(4):49-56 |
| 黏度和电荷对声悬浮二氧化硅液滴中颗粒分布和屈曲的影响 |
| Viscosity and Charge Effects on Particle Distribution and Buckling in Acoustic Levitation of Silica Droplets |
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| DOI：10.3969/j.issn.1005 2895.2025.04.007 |
| 中文关键词: 声悬浮 单液滴实验 多组分液滴 颗粒自组装 屈曲 |
| 英文关键词:acoustic levitation single droplet experiment multicomponent droplets particle self assembly buckling |
| 基金项目:国家自然科学基金资助项目(52376059)；江苏省研究生科研与实践创新计划项目(SJCX24_1349)。 |
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| 中文摘要: |
| 为探究多组分液滴中不同组分添加量及比例对胶体液滴蒸发时颗粒屈曲以及分布的影响，笔者采用Tinylev声悬浮装置将胶体液滴悬浮在声场中，有效避免了蒸发过程中固液接触面的影响；使用粒径为1 μm的二氧化硅粉末制备了质量分数为2.00%的悬浮液，并向其中添加了聚丙烯酸钠(Polyacrylic Acid Sodium Salt，PAAS)和氯化钠(NaCl)来调整液体的黏度及电荷，进而影响粒子在蒸发干燥过程中的分布及屈曲。实验结果表明：在只添加PAAS的液滴中，随着PAAS质量分数的升高，液滴黏度增加，蒸发速率降低，粒子的分散性增强，壳体发生屈曲的概率降低；另一方面，添加NaCl后部分中和了PAAS所带的负电荷，降低了颗粒间的静电排斥力，加剧了屈曲的发生。该研究通过调节液滴黏度和电荷，调控干燥过程中颗粒形貌在环状、碗状和茧状之间过渡，为设计胶体系统中的颗粒形态提供了重要参考。 |
| 英文摘要: |
| In order to explore the influence of different component additions and proportions in multicomponent droplets on the particle buckling and distribution during evaporation of colloidal droplets, the author used the Tinylev acoustic levitation device, a non contact manipulation method, which suspended the colloidal droplets in an acoustic field to effectively avoid the effects of solid liquid contact surface during the evaporation process. A suspension with a mass fraction of 2.00% silica powder with a particle size of 1 μm was prepared, and Polyacrylic Acid Sodium Salt (PAAS) and sodium chloride (NaCl) were added to adjust the liquid′s viscosity and charge, thereby influencing the particle distribution and buckling patterns during the evaporation and drying process. The experimental results indicate that when only PAAS is added to the droplet, the viscosity of the droplets increases with the increase of PAAS mass fraction, decreasing the evaporation rate, promoting particle dispersion, and decreasing probability of shell buckling. On the other hand, the addition of NaCl partially neutralized the negative charge of PAAS, reducing electrostatic repulsion between particles and intensifying the occurrence of buckling. In this study, the transition of particle morphology between ring, bowl and cocoon during drying was regulated by adjusting the viscosity and charge of droplets, which provides an important reference for the design of particle morphology in colloidal systems. |
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