颗粒气泡黏附科学——微纳尺度下颗粒气泡黏附试验研究进展
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摘要
自20世纪30年代始,微纳尺度下的颗粒气泡黏附就引起了学者的广泛关注并逐渐涌现出一系列试验技术探索颗粒气泡黏附机理。在宏观尺度下颗粒气泡黏附研究进展的基础上,系统的对微纳尺度下颗粒气泡间相互作用力及液膜薄化破裂动力学试验技术研究进展进行综述。技术总体上可以分为两类:力测量法及排液法。排液法是通过光学显微干涉技术直接获得气液界面变形及排液动力学数据,通过耦合扩展DLVO理论及排液方程求解作用力信息,如单气泡撞板显微干涉技术、薄膜压力平衡技术及表面力分析仪等。力测量法则主要是借助胶体探针原子力显微镜(AFM)测试颗粒气泡间表面力及流体阻力,通过流体力学排液模型模拟液膜薄化破裂动力学行为。排液法和力测量法均发现疏水力是颗粒气泡间液膜快速薄化并破裂的根本原因,其中排液法所获得的疏水力倾向于一种长程作用力,而力测量法得到的疏水力为短程作用力,造成这种差异的原因仍不明确。随着AFM-反射干涉对比显微镜联用、变形体系力分析仪和薄液膜力分析仪等技术的问世,作用力和液膜排液的同步测试已经成为一种技术趋势,充分助力了浮选颗粒气泡黏附基础研究。基于现有研究进展应进一步开展颗粒气泡间疏水力的系统研究,通过借助不同检测技术的优势互补及分子动力学模拟等手段,有望从根本上阐明这一科学问题。
Since the 1930 s,bubble-particle attachment on a micro-nano scale has attracted the widespread attention of scholars.A series of experimental techniques have emerged to explore the mechanism of bubble-particle attachment.Based on the advances in bubble-particle attachment on a macroscopic scale,advances in the experimental techniques focus on the measurement of bubble-particle interaction force and film drainage on a micro-nano scale were reviewed.Techniques are generally classified into two categories: force measurement method and film drainage approach.For film drainage approach,such as bubble against plate assisted by micro-interference technique,thin film balance,and surface force apparatus,the deformation of gas-water interface and film thinning dynamics data were directly obtained by microscopic interference.The force information was further solved by the combination of extended DLVO theory and drainage equation.For force measurement method,colloidal probe atomic force microscopy( AFM) was used to measure surface and hydrodynamic forces,the film thinning rupture behavior was modeled by using hydrodynamic drainage models.Hydrophobic force was found to be the reason for the rapid thinning and rupture of thin liquid film between bubble and particle through both force measurement method and film drainage approach. The hydrophobic force obtained by film drainage approach tends to be a long-ranged force,while the hydrophobic force obtained by force measurement is a short-ranged force.The reason for this difference is still unclear.With the development of the combination of AFM and reflection interference contrast microscopy,force apparatus for deformable surfaces and integrated thin film drainage apparatus and integrated thin liquid film force apparatus,the synchronous measurement of the interaction force and the spatiotemporal evolution of the confined thin liquid film is a general trend,and it is expected to clarify the scientific mechanism of bubble-particle attachment.in the following research work.
Since the 1930 s,bubble-particle attachment on a micro-nano scale has attracted the widespread attention of scholars.A series of experimental techniques have emerged to explore the mechanism of bubble-particle attachment.Based on the advances in bubble-particle attachment on a macroscopic scale,advances in the experimental techniques focus on the measurement of bubble-particle interaction force and film drainage on a micro-nano scale were reviewed.Techniques are generally classified into two categories: force measurement method and film drainage approach.For film drainage approach,such as bubble against plate assisted by micro-interference technique,thin film balance,and surface force apparatus,the deformation of gas-water interface and film thinning dynamics data were directly obtained by microscopic interference.The force information was further solved by the combination of extended DLVO theory and drainage equation.For force measurement method,colloidal probe atomic force microscopy( AFM) was used to measure surface and hydrodynamic forces,the film thinning rupture behavior was modeled by using hydrodynamic drainage models.Hydrophobic force was found to be the reason for the rapid thinning and rupture of thin liquid film between bubble and particle through both force measurement method and film drainage approach. The hydrophobic force obtained by film drainage approach tends to be a long-ranged force,while the hydrophobic force obtained by force measurement is a short-ranged force.The reason for this difference is still unclear.With the development of the combination of AFM and reflection interference contrast microscopy,force apparatus for deformable surfaces and integrated thin film drainage apparatus and integrated thin liquid film force apparatus,the synchronous measurement of the interaction force and the spatiotemporal evolution of the confined thin liquid film is a general trend,and it is expected to clarify the scientific mechanism of bubble-particle attachment.in the following research work.
引文
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[13] WANG L.Drainage and rupture of thin foam films in the presence of ionic and non-ionic surfactants[J].International Journal of Mineral Processing,2012,102-103:58-68.
[14] SCHELUDKO A.Thin liquid films[J].Advances in Colloid and Interface Science,1967,1(4):391-464.
[15] PAN L,YOON R H.Hydrophobic forces in the wetting films of water formed on xanthate-coated gold surfaces[J]. Faraday Discussions,2010,146:325-340.
[16] PAN L,JUNG S,YOON RH.Effect of hydrophobicity on the stability of the wetting films of water formed on gold surfaces[J].Journal of Colloid and Interface Science,2011,361(1):321-330.
[17] ISRAELACHVILI J,TABOR D.Measurement of van der Waals dispersion forces in the range 1. 4 to 130 nm[J]. Proceedings of the Royal Society of London,1972,331(1584):19-38.
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[20] HORN R G,BACHMANN D,CONNOR J,et al.The effect of surface and hydrodynamic forces on the shape of a fluid drop approaching a solid surface[J]. Journal of Physics:Condensed Matter,1996,8(47):9483.
[21] CONNOR J,HORN R G. The influence of surface forces on thin film drainage between a fluid drop and a flat solid[J].Faraday Discussions,2003,123:193-206.
[22] PUSHKAROVA RA,HORN R G.Bubble-solid interactions in water and electrolyte solutions[J].Langmuir,2008,24(16):8726-8734.
[23] MANICA R,CONNOR J,CLASOHM L Y,et al.Transient responses of a wetting film to mechanical and electrical perturbations[J].Langmuir,2008,24(4):1381-1390.
[24] CONNOR J N,HORN R G.Measurement of aqueous film thickness between charged mercury and mica surfaces:A direct experimental probe of the Poisson-Boltzmann distribution[J]. Langmuir,2001,17(23):7194-7197.
[25] DEL Castillo L A,OHNISHI S,CARNIE S L,et al.Variation of local surface properties of an air bubble in water caused by its interaction with another surface[J]. Langmuir,2016,32(30):7671-7682.
[26] PUSHKAROVA R A,HORN R G.Surface forces measured between an air bubble and a solid surface in water[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2005,261(1):147-152.
[27] BINNIG G,QUATE C F,GERBER C.Atomic force microscope[J].Physical Review Letters,1986,56(9):930-933.
[28] DUCKER W A,SENDEN T J,PASHLEY R M.Direct measurement of colloidal forces using an atomic force microscope[J]. Nature,1991,353(6341):239-241.
[29] DUCKER W A,SENDEN T J,PASHLEY R M. Measurement of forces in liquids using a force microscope[J]. Langmuir,1992,8(7):1831-1836.
[30] BUTT H J. Measuring electrostatic,van der Waals,and hydration forces in electrolyte solutions with an atomic force microscope[J].Biophysical Journal,1991,60(6):1438-1444.
[31] BUTT H J,CAPPELLA B,KAPPL M.Force measurements with the atomic force microscope:Technique,interpretation and applications[J].Surface Science Reports,2005,59(1-6):1-152.
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