COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Shihao Ding,Qinglin Yin,Youfei Zhang,Qi He,Xin Feng,Chao Yang,Yijun Cao,Xiahui Gui,Yaowen Xing
Turbulence plays a critical role in flotation , as it has a marked impact on bubble-particle interactions, i.e., collision, attachment, and detachment. However, the detachment mechanisms of bubble-particle aggregates in a turbulent field are still not well understood. Particularly, the oscillatory detachment mechanism of bubble-particle aggregates lacks direct experimental evidence. For this reason, this study focuses on the study of the detachment mechanism of hydrophobic particles with different sizes on an oscillating bubble surface. In this study, vertical capillary forces of particles with different sizes were measured by surface force apparatus. The bubbles with attached particles were made to vibrate vertically by the oscillatory detachment measurement system, and the critical detachment amplitudes of particles were measured. Images of the dynamic detachment process of particles were captured by a high-speed camera. Then, the detachment mechanism of particles with different sizes on the oscillating bubble surface was further investigated by image analysis, displacement and acceleration measurement , and comparison of experimental and theoretical vertical critical vibration forces. The results show that although the capillary force increases with the increase of particle size, the critical detachment amplitude decreases significantly. It was also observed that the particles with different sizes have different detachment behaviors on the oscillating bubble surface due to the difference of inertia. Compared with the vertical detachment of coarse particles, the approximately tangential detachment of fine particles is the main reason for the decrease of vertical capillary force, which leads to the conclusion that the experimental value of vertical critical vibration force of fine particles is far less than the theoretical value. The present study is expected to provide a fundamental understanding of the bubble-particle detachment mechanism in a turbulent field.
研究领域:
矿物加工工程
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流体力学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
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2025
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IF 26.8
Jicheng Niu,Yulin Zhou,Yonggang Liu,Yulin Liu,Pengpeng Jia,Bin Gao,Hui Guo,Feng Xu,Fei Li
Precisely controlling the cutting of water using mechanical forces remains challenging due to water's inherent surface tension and rapid self-healing properties. Inspired by the effortless movement of water striders, a strategy is developed involving magnetic manipulation of a hydrophobic sphere across hydrophobic particle-encapsulated water (HPEW). Stable mechanical cutting of water is first demonstrated by coating its surface with hydrophobic particles (silica nanoparticles, paraffin, and polytetrafluoroethylene (PTFE)) and maintaining the water thickness below 1 mm. Through systematic theoretical and numerical analyses, it is clarified how water thickness and particle distribution influence cutting performance and accuracy. Moreover, a magnetically controlled approach is established for precise cutting, creating versatile open millifluidic chips suitable for diverse applications such as biochemical assays, chemical synthesis, and 3D cell culture. The approach thus offers a robust platform with wide-ranging implications in materials science, chemistry, physics, biomedical engineering, and microfluidics.
研究领域:
材料科学
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化学
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物理学
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生物医学工程
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微流体技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Feng-Min Wu,Xiao-Wei Wang,Shu-Feng Pang,Yun-Hong Zhang
Tropospheric aerosols are usually complex mixtures of inorganic and organic components, which show non-ideal behavior in hygroscopicity, mass transfer, and partitioning between gas and aerosols. In this study, we applied a novel approach based on a combination of a pulse RH controlling system and a rapid scan vacuum FTIR spectrometer to investigate the mass transfer limit of magnesium sulfate/glutaric acid (GA) mixture aerosol particles. The liquid water band area of the aerosols is used to reveal the mass transfer limit during the rapid pulse RH downward and upward processes. Partitioning equilibrium between the aerosol particles and water gas phase is observed at the higher RH range (73–50%). When the RH is lower than 40%, there is a hysteresis for the liquid water content changing with the RH, indicating the limited water mass transfer in the aerosols.
研究领域:
大气科学
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环境化学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
Dongli Guo,Zehua Yin,Mingyu Zhang,Mohammed Kamal Hadi,Zhijiang Sun,Tao Yao,Fen Ran
In the fields of water treatment and biomedical applications, the high permeability, antibacterial, and antifouling capabilities of ultrafiltration membranes are crucial. In this study, a novel controllable self-assembled soft micelle particle based on the combination of tri-block-copolymers and dopamine hydrochloride is designed as a multifunctional additive. High molecular weight polyvinylpyrrolidone k85 is used as a pore forming agent and hydrophilic agent. Liquid-liquid phase transformation is used to modify the polyether sulfone membrane. The morphology and properties of the modified products and membranes are characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, laser confocal microscopy, water contact angle, permeability measurement, mechanical measurement, antifouling and antibacterial tests. Due to its overall electrically neutral receptor properties, the zwitterionic blend polyether sulfone ultrafiltration membrane has a higher water flux, water flux recovery rate, and BSA retention rate. The results show that the pure water flux of the modified membrane is as high as 422 m-2 h-1, and the rejection rate of bovine serum albumin is 97.83 %. It exhibits excellent water flux recovery rate and antifouling ability, and the modified membrane demonstrates effective antibacterial performance against Escherichia coli.
研究领域:
水处理
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生物医学工程
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材料科学
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）