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An experimental study on size distribution and zeta potential of bulk cavitation nanobubbles

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 152-161页

作者： Xu-yu Zhang Qian-shuai Wang Zhong-xian Wu Dong-ping Tao School of Mining Engineering University of Science and Technology LiaoningAnshan 114051China School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255049China

Nanobubble flotation technology is an important research topic in the field of fine mineral particle *** basic characteristics of nanobubbles,including their size,concentration,surface zeta potential,and stability have a significant impact on the nanobubble flotation *** this paper,bulk nanobubbles generated based on the principle of hydrodynamic cavitation were investigated to determine the effects of different parameters(e.g.,surfactant(frother)dosage,air flow,air pressure,liquid flow rate,and solution pH value)on their size distribution and zeta potential,as measured using a nanoparticle *** results demonstrated that the nanobubble size decreased with increasing pH value,surfactant concentration,and cavitation-tube liquid flow rate but increased with increasing air pressure and increasing air flow *** magnitude of the negative surface charge of the nanobubbles was positively correlated with the pH value,and a certain relationship was observed between the zeta potential of the nanobubbles and their *** structural parameters of the cavitation tube also strongly affected the characteristics of the *** results of this study offer certain guidance for optimizing the nanobubble flotation technology.

关键词： nanobubble hydrodynamic cavitation zeta potential size distribution

Ionic Distribution, Electrostatic potential and zeta potential at Electrochemical Interfaces

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Chinese Journal of Chemical Engineering 2004年第5期12卷 688-695页

作者：于养信吴建中高光华 State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University Beijing 10084 China Department of Chemical and Environmental Engineering University of California Riverside California 925210425 USA

Density functional theory is applied to predicting the structures and electrostatic potentials of planar electrochemical surfaces within the framework of the restricted primitive model where small ions are represented by charged hard spheres of equal diameter and the solvent is assumed to be a continuous dielectric medium. The hard-sphere contribution to the excess Helmholtz energy functional is evaluated using the modified fundamentalmeasure theory and the electrostatic contribution is obtained from the quadratic functional Taylor expansion using the second-order direct correlation function from the mean-spherical approximation. Numerical results for the ionic density profiles and the mean electrostatic potentials near a planar surface of various charge densities are in excellent agreement with molecular simulations. In contrast to the modified Gouy-Chapman theory, the present density functional theory correctly predicts the second layer formation and charge inversion of charged surfaces as observed in simulations and in experiments. The theory has also been tested with the zeta potentials of positively charged polystyrene particles in aqueous solutions of KBr. Good agreement is achieved between the calculated and experimental results.

关键词： density functional theory electric double layer zeta potential polystyrenecolloid

Progress in nanoparticles characterization:Sizing and zeta potential measurement

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Particuology 2008年第2期6卷 112-115页

作者： Renliang Xu Particle Characterization Beckman Coulter Inc. Miami Florida USA

Characterization of various nanoparticles is on the center stage in nanotechnology development. The subjects for nanoparticles characterization are focused on particle size and particle surface charge determinations. This article summarizes the latest development in particle size analysis using dynamic light scattering and surface charge determination using electrophoretic light scattering for nano-or even sub-nanoparticles in concentrated suspensions.

关键词： Nanoparticles Light scattering zeta potential Suspension Sizing

Application of ion-engineered Persian Gulf seawater in EOR:effects of different ions on interfacial tension,contact angle,zeta potential,and oil recovery

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Petroleum Science 2021年第3期18卷 895-908页

作者： Amir Hossein Saeedi Dehaghani Seyed Masoud Ghalamizade Elyaderani Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran

In this study,we initially performed interfacial tension(IFT)tests to investigate the potential of using the Persian Gulf seawater(PGSW)as smart water with diferent concentrations of NaCl,KCl,MgCl_(2),CaCl_(2),and Na_(2)SO_(4).Next,for each salt,at the concentration where IFT was minimum,we conducted contact angle,zeta potential,and micromodel fooding *** results showed that IFT is minimized if NaCl or KCl is removed from PGSW;thus,for solutions lacking NaCl and KCl,the IFT values were obtained at 26.29 and 26.56 mN/m,***,in the case of divalent ions,minimum IFT occurred when the concentration of MgCl_(2),CaCl_(2),and Na_(2)SO_(4) in PGSW ***,a threefold rise in the concentration of Na_(2)SO_(4) further reduced IFT as compared to optimal concentrations of MgCl_(2) or CaCl_(2).It should be mentioned that eliminating NaCl from PGSW resulted in the lowest IFT value compared to adding or removing other *** the removal of NaCl caused the contact angle to decrease from 91.0°to 67.8°relative to PGSW and changed surface wettability to weakly water-wet,eliminating KCl did not considerably change the contact angle,such that it only led to a nine-degree reduction in this angle relative to PGSW and left wettability in the same neutral-wet *** optimal concentrations of MgCl_(2),CaCl_(2),and Na_(2)SO_(4),only an increase in Na_(2)SO_(4) concentration in PGSW could change wettability from neutral-wet to weakly *** solutions with optimal concentrations,the removal of NaCl or KCl caused the rock surface to have slightly higher negative charges,and increasing the concentration of divalent ions led to a small reduction in the negative charge of the *** results of micromodel fooding indicated that NaCl-free PGSW could raise oil recovery by 10.12%relative to ***,when the Na_(2)SO_(4) concentration in PGSW was tripled,the oil recovery increased by 7.34%compared to ***,depending on th

关键词： Smart water Minimum IFT Wettability zeta potential Enhanced oil recovery

Preparation of Polycarboxylate-based Superplasticizer and Its Effects on zeta potential and Rheological Property of Cement Paste

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Journal of Wuhan University of Technology(Materials Science) 2015年第5期30卷 1008-1012页

作者：刘明雷家珩 BI Yao DU Xiaodi ZHAO Qinglin ZHANG Xuqing School of Materials Science and Engineering Wuhan University of Technology School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan Green Construction Chemicals Co. LTD

A series of polycarboxylate-based superplasticizers(PCs) with different structures were synthesized and the effects of chemical structure on zeta potential and rheological property of cement paste were studied. Residual monomers in each sample of PCs were quantitatively determined. The property of the polymers in cement was tested by micro-electrophoresis apparatus and R/S rheometer. Results showed that the zeta potential and its rheological properties are related with the side-chain length and density of PCs. The PCs having shorter side chain and lower side chain density exhibit higher anionic charge density, thus resulting in higher zeta potential. The effect of side chain density on zeta potential is more notable compared with that of side-chain length, and thus affecting the initial shear yield stress and apparent viscosity of the cement paste. In addition, although increasing the side chain length will result in reduction of the anionic charge density, the steric hindrance effect is obvious, which can effectively improve the dispersion of the cement particles, and reduce the viscosity and shear yield stress of slurry.

关键词： comb polymer polycarboxylate-based superplasticizers zeta potential cement dispersant rheological property

zeta potential and Rheological Behavior of ULC Castables Matrix

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China's Refractories 2008年第2期17卷 12-15页

作者： XU Yuanchao WANG Zhanmin CAO Xiying Sinosteel Luoyang Institute of Refractories Research Co. Ltd. Luoyang 471039 China

Effects of starting materials and four dispersants （ STP, SHP, FDN and FS60 ） on zeta potential and rheological behavior of alumina based ULC castables matrix were investigated. The results show that： characteristics of silica fume and alumina cements play a very important role in zeta potential and viscosity of suspensions of the castables matrix; the dispersants STP and SHP can change zeta potential values of the matrix suspensions remarkably; the four dispersants can effectively improve the rheological properties of matrix suspensions. For the point of lower viscosity of the matrix suspensions, the suitable additions of the three dispersants （ SHP , FDN and FS60 ） are about 0. 2% while that of STP is about 0. 3%.

关键词： zeta potential Viscosity Dispersant

zeta potential Determination of Particles in Suspension

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Zeta Potential Determination of Particles in Suspension

Correlation Evaluation of Ion Adsorption-Based Rare Earth Leaching Performance Based on zeta potential Drop Leaching

第八届国际粉体检测与控制学术会议

作者： Renliang Xu Particle Characterization,Beckman Coulter,Inc. 11800 SW 147 Ave.,Miami,FL 33116-9015 USA

Characterization of particles is on the center stage in nanotechnology *** subjects for nanoparticle characterization are currently focused on particle size and particle surface *** particle surface charge,characterized by zeta potential,is vital in R&D and QC of nanoparticles suspensions for sample stability and particle surface adsorption or *** article summarizes the latest development in particle surface charge determination using electrophoretic light scattering for nanoparticles in both dilute and concentrated suspensions.

关键词： Particle characterization zeta potential Concentrated suspension Electrophoretic mobility Surface charge

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Journal of Materials Science and Chemical Engineering 2023年第11期11卷 28-47页

作者： Xunhe Li Zhengxiong Ding Sengbiao Zeng Yanzhu Liu Dongping Li Yongxiu Li School of Chemistry and Chemical Engineering Nanchang University Nanchang China

Rare earth elements are indispensable raw materials for advanced aero-engines, special optical materials, and high-performance electronic products. With the development of the social economy, the global demand for rare earth resources is increasing, and rare earths have become a key metal for the development of new industries and frontier technologies that are highly valued both at home and abroad. Ion-adsorbed rare earth ores are an important source of rare earths, so the efficient green leaching of ion-adsorbed rare earths is important. Researchers found that the selection of an efficient green leaching agent for ion-adsorbed rare earths is based on the zeta potential of tailing clay minerals in addition to leaching efficiency, and both zeta potential and leaching ion concentration are related to mineral acidity and alkalinity, and the pH of tailing water suspension is a direct indicator of environmental water quality requirements. Therefore, the efficiency of the leaching process is closely integrated with the environmental evaluation, and the characteristics and correlation of the changes in zeta potential, pH, conductivity and pollutant concentration of the pulp of clay mineral content during the leaching process of ore leaching and tailings aqueous electrolyte solution leaching are studied by evaluating the leaching system, and a set of correlation leaching efficiency and environmental impact evaluation method is established based on the results of the above analysis, which is of scientific development of ion adsorption rare earth resources. It has important theoretical significance and practical application value.

关键词： Ion Adsorption Rare Earth Ph Value zeta potential the Leaching Efficiency

The Behavior of zeta potential of Silica Suspensions

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New Journal of Glass and Ceramics 2014年第2期4卷 29-37页

作者： Jose Antonio Alves Junior Joao Baptista Baldo Departamento de Materiais Universidade Federal de Sao CarlosSao CarlosBrazil

zeta potential is one of the most relevant parameters controlling the rheological behavior of ceramic suspensions. In this work, it was observed that for pH values below the isoelectric point (IEP), the positive value of zeta potential of water suspensions of α-quartz and α-cristobalite, experiences a sudden steep increase with the increase in specific surface area of the powders. For pH values above the IEP, the zeta potential values of crystalline forms of silica (α-quartz and α-cristobalite), get gradually more negative with the increase in pH. Conversely in the case of vitreous silica, for pH values above 6, there occurs a steep change towards more negative values of zeta potential than those presented by quartz and cristobalite. These findings have not yet been accounted for in the DLVO theory but may provide subsidies for better understanding of how to stabilize and destabilize crystalline and vitreous silica water suspensions.

关键词： Silica Slurries zeta potential Stabilization Iso-Electronic Point Silica