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Li H, Peng T, Wang J, Zhang K, Wang D, Xie L. Probing the Interfacial Interaction Mechanisms of Nitrogen with Dodecane/Toluene: Implications for Foam Flooding. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 39276096 DOI: 10.1021/acs.langmuir.4c02486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/16/2024]
Abstract
Interfacial interactions between deformable bubbles and oil drops have attracted much attention in foam flooding. However, interactions involving nitrogen bubbles have not been reported. In this work, the interaction forces between nitrogen and dodecane/toluene in aqueous solutions were quantified using the atomic force microscopy bubble probe technique. The effects of the solution pH, ionic type, and solution concentration on the interactions were analyzed. The van der Waals (vdW), electric double layer (EDL), and hydrophobic (HB) interactions were involved in the low-concentration solutions. The EDL repulsion in NaCl increased with solution pH, while in CaCl2 and MgCl2, the EDL repulsion in general decreased and then increased with pH, attributed to the adsorption of OH- and divalent cations and their hydration products. The adsorption of divalent cations at the toluene/water interface was pronounced by cation-π interactions. At pH 10, precipitated divalent cation hydroxides at the bubble/water and oil/water interfaces adsorbed more cations, causing the increase of the surface potential. At high salinity, the EDL interaction was suppressed and the vdW repulsion became predominant. The vdW force of nitrogen with toluene was stronger than that with dodecane. Under all of the solution conditions, the attractive interaction could not overcome the total repulsive interaction at the minimum separation, and thus no bubble attachment was observed, which implied that a stable bubble/liquid/oil film was essential for maintaining foam stability. This work provides useful insights into the interfacial interaction mechanisms in nitrogen foam flooding. The findings can be readily extended to other engineering systems such as oil flotation and bubble-oil-water emulsions.
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Affiliation(s)
- Han Li
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Ting Peng
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Jingyi Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
- Sichuan Provincial Key Laboratory of Oil and Gas Fields Applied Chemistry, Chengdu, Sichuan 610500, China
| | - Kuanjun Zhang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
| | - Dianlin Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
- Sichuan Provincial Key Laboratory of Oil and Gas Fields Applied Chemistry, Chengdu, Sichuan 610500, China
| | - Lei Xie
- School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, China
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2
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Meng D, Xie H, Yan B, Zhao W, Fu Y, Hu W, Gao Y. Probing the Interaction Mechanism of Sodium Oleate and Dodecyl Amine with Quartz Surfaces in the Presence of Ca 2+ Ions by AFM Force Measurement. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38438319 DOI: 10.1021/acsami.3c17292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
Quartz is a key raw material in high-tech fields (such as photovoltaics and semiconductor microelectronics), and the most efficient extraction method of quartz is mineral flotation. Quartz activation plays a crucial role in mineral flotation. However, the mechanism underlying the process remains unclear, and the role of additional metal ions is controversial. In this study, the interaction forces between the quartz surface, the dodecylamine (DDA) cation/sodium oleate (NaOL) anion mixed collectors, and Ca2+ were analyzed using atomic force microscopy in order to systematically explore the activation process of quartz flotation. The results confirmed that the activation process was initialized from NaOL, which was adsorbed on the surface of a calcium-covered quartz surface. The existence of DDA inhibited the binding of Ca2+ to NaOL so that more Ca2+ was adsorbed on the quartz surface to provide the adsorption site for NaOL. Moreover, the best adsorption condition of Ca2+ + NaOL + DDA mixed solution was analyzed by quartz crystal microbalance with dissipation, and it demonstrated that the most stable chemisorption environment on the quartz surface was at pH 11.0. In these circumstances, Ca2+ could first adsorb in a point-like manner on the quartz surface, which was then adsorbed with a mixture of NaOL and DDA. This result showed that, at a specific pH, Ca2+ could encourage the coadsorption of cationic/anionic mixed collectors on quartz. This work provides an important new understanding of the intermolecular interactions that take place during complex mineral flotation processes between chemical additives and mineral surfaces. The methodology used in this study can be easily adapted to different interfacial processes, including water treatment, membrane technology, bioengineering, and oil production.
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Affiliation(s)
- Di Meng
- School of Metallurgy and Environment, Central South University, Changsha 410083, PR China
| | - Haipeng Xie
- Physical Science and Electronics, Central South University, Changsha 410083, PR China
| | - Bin Yan
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Weixuan Zhao
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, PR China
| | - Yiming Fu
- Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, 999077 Hong Kong, China
| | - Wenjihao Hu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, PR China
| | - Yongli Gao
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, United States
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3
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Yu J, Liu S, Cheng C, Xiong S, Liu G. The effect mechanism of calcite or quartz particles towards bastnaesite flotation with octyl hydroxamic acid. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.118391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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4
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Shi Z, Ran B, Liu L. Determining the interaction energy of a quartz–kaolinite system at different pH levels by atomic force microscopy and extended DLVO theory. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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5
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Feng B, Li Y, Li R, Li H. Error analysis in calculation and interpretation of AFM tip-surface interaction forces. Adv Colloid Interface Sci 2022; 306:102710. [PMID: 35691096 DOI: 10.1016/j.cis.2022.102710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 05/22/2022] [Accepted: 05/29/2022] [Indexed: 11/01/2022]
Abstract
This review addresses some possible errors in calculation and interpretation of AFM tip-surface interaction forces. These usually ignored errors can affect the accuracy and correctness of the interpretation results obtained from measured interaction forces, thus hindering the application of AFM technology in related fields of colloid and interface science. Based on comprehensive analysis and assessment, three important aspects in the existing literature that may introduce significant errors in calculation and interpretation of AFM tip-surface interaction forces have been identified, and corresponding reasonable suggestions have been proposed. (1) The frequently used over-approximated electrostatic force formulas can cause great errors in the electrostatic force and the fitting of surface potential and surface charge density. Therefore, adequate electrostatic force calculation methods, like linear superposition approximation (LSA) or exact numerical solutions, should be used. (2) The over-approximated AFM tip-surface interaction models (spherical tip and flat tip-flat surface interaction models (s-f and f-f)) will lead to large errors in the electrostatic force and van der Waals force, and the subsequently fitted surface potential, surface charge density, and Hamaker constant. Therefore, the conical tip with spherical end and the conical tip with flat circular end-flat surface interaction models (cs-f and cf-f) rather than the over-approximated models (s-f and f-f) should be applied. Besides, it is recommended to use cf-f instead of cs-f to measure the interaction forces for more accuracy. (3) The inaccurately obtained (usually by SEM image) AFM tip geometry parameters (radius and half angle) have significant impacts on the fitting results of surface potential, surface charge density, and Hamaker constant. More accurate AFM tip geometry parameters and reasonable assessment of errors in calculation and interpretation are necessary.
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6
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Uncovering the hydrophobic mechanism of a novel dithiocarbamate-hydroxamate surfactant towards galena. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116765] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Xie L, Wang J, Lu Q, Hu W, Yang D, Qiao C, Peng X, Peng Q, Wang T, Sun W, Liu Q, Zhang H, Zeng H. Surface interaction mechanisms in mineral flotation: Fundamentals, measurements, and perspectives. Adv Colloid Interface Sci 2021; 295:102491. [PMID: 34332278 DOI: 10.1016/j.cis.2021.102491] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 07/16/2021] [Accepted: 07/18/2021] [Indexed: 12/23/2022]
Abstract
As non-renewable natural resources, minerals are essential in a broad range of biological and technological applications. The surface interactions of mineral particles with other objects (e.g., solids, bubbles, reagents) in aqueous suspensions play a critical role in mediating many interfacial phenomena involved in mineral flotation. In this work, we have reviewed the fundamentals of surface forces and quantitative surface property-force relationship of minerals, and the advances in the quantitative measurements of interaction forces of mineral-mineral, bubble-mineral and mineral-reagent using nanomechanical tools such as surface forces apparatus (SFA) and atomic force microscope (AFM). The quantitative correlation between surface properties of minerals at the solid/water interface and their surface interaction mechanisms with other objects in complex aqueous media at the nanoscale has been established. The existing challenges in mineral flotation such as characterization of anisotropic crystal plane or heterogeneous surface, low recovery of fine particle flotation, and in-situ electrochemical characterization of collectorless flotation as well as the future work to resolve the challenges based on the understanding and modulation of surface forces of minerals have also been discussed. This review provides useful insights into the fundamental understanding of the intermolecular and surface interaction mechanisms involved in mineral processing, with implications for precisely modulating related interfacial interactions towards the development of highly efficient industrial processes and chemical additives.
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Affiliation(s)
- Lei Xie
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Jingyi Wang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Qiuyi Lu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Wenjihao Hu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada; School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Diling Yang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Chenyu Qiao
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Xuwen Peng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Qiongyao Peng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Tao Wang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Wei Sun
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Qi Liu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Hao Zhang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
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Zhang Z, Sun Q, Liu S, Lu Z, Niu X, Ahmed MMM, Liu G. The selective flotation separation of galena from sphalerite with a novel collector of 5-amyl-1, 2, 4-triazole-3-thione. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115902] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Zhuo Q, Liu W, Xu H, Zhang H, Sun X. Experimental Investigation of the Attachment Performance between Coal Particle and Bubble. ACS OMEGA 2021; 6:7979-7987. [PMID: 33817456 PMCID: PMC8014942 DOI: 10.1021/acsomega.0c04093] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
Attachment behavior is a key component of flotation and has a decisive influence on flotation performance, and the experiment research on the attachment between mineral particles and bubbles still needs further research. In this work, a particle-bubble attachment apparatus and multiple target tracking software were developed. Coal particles were used as the subjects, and the effect of particle properties on the attachment performance was studied from the perspective of the particle group. The particle-bubble attachment experiments indicated that the collision position had an effect on the attachment efficiency, and the attachment efficiency decreased with an increase in the collision angle. The efficiency-weighted attachment angle was proposed to quantitatively describe the attachment performance of coal samples. The efficiency-weighted attachment angle of low-density coal samples was greater than that of high-density coal samples. For particles with different sizes, the efficiency-weighted attachment angle of fine particles was greater than that of coarse particles. Furthermore, SDS weakened the attachment performance between coal particles and bubbles via adsorption on the bubble, and the efficiency-weighted attachment angle decreased as the concentration of the SDS solution increased. CTAB adsorbed on coal particles and bubbles, and the efficiency-weighted attachment angle first increased and then decreased with increasing CTAB concentration.
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Affiliation(s)
- Qiming Zhuo
- School
of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
- State
Key Laboratory of Mineral Processing, Beijing
General Research Institute of Mining & Metallurgy, Beijing 102600, China
- College
of Geoscience and Survey Engineering, China
University of Mining & Technology (Beijing), Beijing 100083, China
| | - Wenli Liu
- School
of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
| | - Hongxiang Xu
- School
of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
| | - He Zhang
- School
of Mining Engineering, Heilongjiang University
of Science and Technology, Heilongjiang 150080, China
| | - Xiaopeng Sun
- School
of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
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10
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Wang J, Xie L, Han L, Wang X, Wang J, Zeng H. In-situ probing of electrochemical dissolution and surface properties of chalcopyrite with implications for the dissolution kinetics and passivation mechanism. J Colloid Interface Sci 2021; 584:103-113. [DOI: 10.1016/j.jcis.2020.09.115] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/25/2020] [Accepted: 09/26/2020] [Indexed: 02/08/2023]
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11
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Wang J, Li J, Xie L, Liu Q, Zeng H. Understanding the Interaction Mechanism between Elemental Selenium and Ferric Hydroxide in Wastewater Treatment. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00533] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jingyi Wang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
| | - Junmeng Li
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
| | - Lei Xie
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
| | - Qingxia Liu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada
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12
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Xie L, Cui X, Gong L, Chen J, Zeng H. Recent Advances in the Quantification and Modulation of Hydrophobic Interactions for Interfacial Applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2985-3003. [PMID: 32023067 DOI: 10.1021/acs.langmuir.9b03573] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Hydrophobic interaction is responsible for a variety of colloidal phenomena, which also plays a key role in achieving the desired characteristics and functionalities for a wide range of interfacial applications. In this feature article, our recent advances in the quantification and modulation of hydrophobic interactions at both solid/water and air/water interfaces in different material systems have been reviewed. On the basis of surface forces apparatus (SFA) measurements of hydrophobic polymers (e.g., polystyrene), a three-regime hydrophobic interaction model that could satisfactorily encompass the hydrophobic interaction with different ranges was proposed. In addition, the atomic force microscope (AFM) coupled with various techniques such as the colloidal probe, the electrochemical process, and force mapping were employed to quantify the hydrophobic interaction from different perspectives. For the hydrophobic interactions involving deformable bubbles, the bubble probe AFM combined with reflection interference contrast microscopy (RICM) was used to simultaneously measure the interaction force and spatiotemporal evolution of the thin film drainage process between air bubbles and hydrophobized mica surfaces in an aqueous medium. The studies on the interactions of air bubbles with self-assembled monolayers (SAMs) demonstrated that the range of hydrophobic interactions does not always increase monotonically with the hydrophobicity of interacting surfaces as characterized by the static water contact angle; viz., surfaces with similar hydrophobicity can exhibit different ranges of hydrophobic interaction, while surfaces with different hydrophobicities can exhibit a similar range of hydrophobic interactions. It is found that the hydrophobic interaction can be modulated by tuning the surface nanoscale structure and chemistry. Moreover, the long-range "hydrophilic" attraction that resembles the hydrophobic interaction was discovered between water droplets and polyelectrolyte surfaces in an oil medium, on the basis of which polyelectrolyte coating materials were designed for oil cleaning, oil/water separation, and demulsification. The interfacial applications, remaining challenges, and future perspectives of hydrophobic interactions are discussed.
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Affiliation(s)
- Lei Xie
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Xin Cui
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Lu Gong
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Jingsi Chen
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
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13
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Zhao X, Meng Q, Yuan Z, Zhang Y, Li L. Effect of sodium silicate on the magnetic separation of ilmenite from titanaugite by magnetite selective coating. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2018.12.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Zhang L, Xie L, Cui X, Chen J, Zeng H. Intermolecular and surface forces at solid/oil/water/gas interfaces in petroleum production. J Colloid Interface Sci 2018; 537:505-519. [PMID: 30469119 DOI: 10.1016/j.jcis.2018.11.052] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 11/12/2018] [Accepted: 11/12/2018] [Indexed: 11/25/2022]
Abstract
Many challenging issues are encountered along the petroleum production such as the wettability alteration of reservoir solids due to deposition of petroleum materials, stabilization/destabilization of water-in-oil and oil-in-water emulsions and treatment of tailings water. All these problems are essentially driven by the fundamental intermolecular and surface forces among the different components (i.e., water, oil, solid and gas) in the surrounding complex fluid media, and comprehensive understanding of the interactions among these components will pave the way to the development of advanced materials and technologies for improved petroleum production processes. In this work, we have reviewed the quantitative force measurement methods in different petroleum systems by using nanomechanical techniques including surface forces apparatus (SFA) and atomic force microscope (AFM). Interaction forces between petroleum components (e.g., asphaltenes) and mineral solids in both organic solvents and aqueous solutions are reviewed and correlated to the wettability change of the reservoir solids. The recent key progress in quantifying the surface forces of water-in-oil and oil-in-water emulsion drops using AFM drop probe techniques are discussed. The interaction forces of polymer flocculants and colloidal particles are correlated to the performance of tailings water treatment. The current knowledge gap and future perspectives are also presented.
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Affiliation(s)
- Ling Zhang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Lei Xie
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Xinwei Cui
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Jingsi Chen
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
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15
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Xie L, Wang J, Huang J, Cui X, Wang X, Liu Q, Zhang H, Liu Q, Zeng H. Anisotropic Polymer Adsorption on Molybdenite Basal and Edge Surfaces and Interaction Mechanism With Air Bubbles. Front Chem 2018; 6:361. [PMID: 30211150 PMCID: PMC6124653 DOI: 10.3389/fchem.2018.00361] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 07/30/2018] [Indexed: 11/13/2022] Open
Abstract
The anisotropic surface characteristics and interaction mechanisms of molybdenite (MoS2) basal and edge planes have attracted much research interest in many interfacial processes such as froth flotation. In this work, the adsorption of a polymer depressant [i.e., carboxymethyl cellulose (CMC)] on both MoS2 basal and edge surfaces as well as their interaction mechanisms with air bubbles have been characterized by atomic force microscope (AFM) imaging and quantitative force measurements. AFM imaging showed that the polymer coverage on the basal plane increased with elevating polymer concentration, with the formation of a compact polymer layer at 100 ppm CMC; however, the polymer adsorption was much weaker on the edge plane. The anisotropy in polymer adsorption on MoS2 basal and edge surfaces coincided with water contact angle results. Direct force measurements using CMC functionalized AFM tips revealed that the adhesion on the basal plane was about an order of magnitude higher than that on the edge plane, supporting the anisotropic CMC adsorption behaviors. Such adhesion difference could be attributed to their difference in surface hydrophobicity and surface charge, with weakened hydrophobic attraction and strengthened electrostatic repulsion between the polymers and edge plane. Force measurements using a bubble probe AFM showed that air bubble could attach to the basal plane during approach, which could be effectively inhibited after polymer adsorption. The edge surface, due to the negligible polymer adsorption, showed similar interaction behaviors with air bubbles before and after polymer treatment. This work provides useful information on the adsorption of polymers on MoS2 basal/edge surfaces as well as their interaction mechanism with air bubbles at the nanoscale, with implications for the design and development of effective polymer additives to mediate the bubble attachment on solid particles with anisotropic surface properties in mineral flotation and other engineering processes.
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Affiliation(s)
- Lei Xie
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Jingyi Wang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Jun Huang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Xin Cui
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Xiaogang Wang
- College of Material Science and Engineering, Heavy Machinery Engineering Research Center of Education Ministry, Taiyuan University of Science and Technology, Taiyuan, China
| | - Qingxia Liu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Hao Zhang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Qi Liu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada
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