Effect of liquid surface tension on the detachment behavior of an air bubble and a glass bead

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-10-01 DOI:10.1016/j.powtec.2025.121697

Mianyan Yang, Zhongqi Wei, Zhijun Zhang

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Abstract

The effect of liquid surface tension on the detachment behavior of bubbles and different hydrophobic glass beads was investigated. By measuring the receding contact angle, induction time and detachment force, the mechanism of liquid surface tension on the detachment of bubbles and different hydrophobic glass beads was revealed. The results showed that when liquid surface tension was decreased from 72.86 ± 0.05 mN/m to 71.76 ± 0.04 mN/m, there were slight changes in receding contact angle, induction time and critical detachment force of different hydrophobic glass beads. This indicates that liquid diffusion and wetting on the glass bead surface were limited, and had a minimal effect on detachment behavior in a certain range of liquid surface tension. However, when the liquid surface tensions were 58.16 ± 0.12 mN/m and 41.74 ± 0.22 mN/m, the liquid diffusion and wetting on the different hydrophobic glass bead surfaces were enhanced. The receding contact angle and critical detachment force between bubbles and glass beads were decreased. It indicates that the extension of three-phase contact line (TPCL) between bubbles and different hydrophobic glass beads was hindered, thereby decreasing the stability of the aggregates. This research provides guidance on selecting optimal surface tension for separating different hydrophobic particles, therefore improving flotation performance.

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液体表面张力对气泡和玻璃珠分离行为的影响

研究了液体表面张力对气泡和不同疏水玻璃微珠分离行为的影响。通过对后退接触角、诱导时间和分离力的测定，揭示了液体表面张力对气泡和不同疏水玻璃微珠分离的作用机理。结果表明：当液体表面张力从72.86±0.05 mN/m降低到71.76±0.04 mN/m时，不同疏水玻璃微珠的后退接触角、诱导时间和临界脱离力变化不大；这表明液体在玻璃珠表面的扩散和润湿是有限的，并且在一定的液体表面张力范围内对分离行为的影响很小。而当液体表面张力为58.16±0.12 mN/m和41.74±0.22 mN/m时，液体在不同疏水玻璃珠表面的扩散和润湿增强。减小了气泡与玻璃微珠之间的后退接触角和临界分离力。结果表明，气泡与不同疏水玻璃微珠之间三相接触线（TPCL）的延伸受到阻碍，从而降低了聚集体的稳定性。该研究为分离不同疏水颗粒选择最佳表面张力，从而提高浮选性能提供了指导。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.