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Wu Z, Fan J, Hu J, Xie W, Sun S, Hu S, Li C, Wang Z, Ituen E. Temperature-responsive salt-resistant poly(sulfobetaine methacrylate)-based emulsifiers for heavy oils. Int J Biol Macromol 2024; 268:131977. [PMID: 38692540 DOI: 10.1016/j.ijbiomac.2024.131977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 04/26/2024] [Accepted: 04/28/2024] [Indexed: 05/03/2024]
Abstract
The emulsions prepared with most currently reported emulsifiers are stable only at room temperature and are susceptible to demulsification at higher temperatures. This thermal instability prevents their use in high-temperature and high-salt environments encountered oilfield extraction. To address this issue, in this study, two temperature-responsive emulsifiers, PSBMA and CS-PSBMA, were synthesized. Both emulsifiers exhibited the ability to form stable emulsions within the temperature range of 60-80 °C and undergo demulsification at 20-40 °C. A comprehensive investigation was conducted to assess the impact of emulsifier concentration, water-to-oil ratio, and salt ion concentration on the stability of emulsions formed by these two emulsifiers. The results demonstrated their remarkable emulsification capabilities across diverse oil phases. Notably, the novel emulsifier CS-PSBMA, synthesized through the grafting chitosan (CS) onto PSBMA, not only exhibits superior emulsion stability and UCST temperature responsiveness but also significantly enhanced the salt resistance of the emulsion. Remarkably, the emulsion maintained its stability even in the presence of monovalent salt ions at concentrations up to 2 mol/L (equivalent to a mineralization level of 1.33 × 105 mg/L in water) and divalent salt ions at concentrations up to 3 mol/L (equivalent to a mineralization level of 2.7 × 105 mg/L in water). The emulsions stabilized by both emulsifiers are resilient to harsh reservoir conditions and effectively emulsify heavy oils, enabling high-temperature emulsification and low-temperature demulsification. These attributes indicate their promising potential for industrial applications, particularly in the field of enhanced oil recovery.
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Affiliation(s)
- Ziqi Wu
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Junjie Fan
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Jianwen Hu
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Wenqing Xie
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Shuangqing Sun
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China; Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
| | - Songqing Hu
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China; Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Chunling Li
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China; Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Zhikun Wang
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China; Institute of Advanced Materials, China University of Petroleum (East China), Qingdao, Shandong 266580, China
| | - Ekemini Ituen
- Materials and Oilfield Chemistry Research Group, University of Uyo, Uyo, Nigeria
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Dowlati S, Mokhtari R, Hohl L, Miller R, Kraume M. Advances in CO 2-switchable surfactants towards the fabrication and application of responsive colloids. Adv Colloid Interface Sci 2023; 315:102907. [PMID: 37086624 DOI: 10.1016/j.cis.2023.102907] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 04/13/2023] [Accepted: 04/13/2023] [Indexed: 04/24/2023]
Abstract
CO2-switchable surfactants have selective surface-activity, which can be activated or deactivated either by adding or removing CO2 from the solution. This feature enables us to use them in the fabrication of responsive colloids, a group of dispersed systems that can be controlled by changing the environmental conditions. In chemical processes, including extraction, reaction, or heterogeneous catalysis, colloids are required in some specific steps of the processes, in which maximum contact area between immiscible phases or reactants is desired. Afterward, the colloids must be broken for the postprocessing of products, solvents, and agents, which can be facilitated by using CO2-switchable surfactants in surfactant-stabilized colloids. These surfactants are mainly cationic and can be activated by the protonation of a nitrogen-containing group upon sparging CO2 gas. Also, CO2-switchable superamphiphiles can be formed by non-covalent bonding between components at least one of which is CO2-switchable. So far, CO2-switchable surfactants have been used in CO2-switchable spherical and wormlike micelles, vesicles, emulsions, foams, and Pickering emulsions. Here, we review the fabrication procedure, chemical structure, switching scheme, stability, environmental conditions, and design philosophy of such responsive colloids. Their fields of application are wide, including emulsion polymerization, catalysis, soil washing, drug delivery, extraction, viscosity control, and oil transportation. We also emphasize their application for the CO2-assisted enhanced oil recovery (EOR) process as a promising approach for carbon capture, utilization, and storage to combat climate change.
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Affiliation(s)
- Saeid Dowlati
- Chair of Chemical and Process Engineering, Technical University of Berlin, Ackerstraße 76, D-13355 Berlin, Germany.
| | - Rasoul Mokhtari
- Danish Offshore Technology Centre, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Lena Hohl
- Chair of Chemical and Process Engineering, Technical University of Berlin, Ackerstraße 76, D-13355 Berlin, Germany
| | - Reinhard Miller
- Institute for Condensed Matter Physics, Technical University of Darmstadt, Hochschulstraße 8, D-64289 Darmstadt, Germany
| | - Matthias Kraume
- Chair of Chemical and Process Engineering, Technical University of Berlin, Ackerstraße 76, D-13355 Berlin, Germany
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pH/Temperature-Responsive Salt-Tolerant Pickering Emulsion Formed by PNIPAM-Modified Chitosan Particles. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Cao J, Zhao X, Ye L. Super-strong and anti-tearing poly(vinyl alcohol)/graphene oxide nano-composite hydrogels fabricated by formation of multiple crosslinking bonding network structure. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.05.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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5
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Yue W, Huang Z, Xiao M, Li X, Ma W, Zhang Y, Dai S, Lu H. Higher Fatty Acid-Based CO2-Controllable Dual-Circulation Approach for Oil Recovery. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c04122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wenjian Yue
- College of Chemistry and Chemical Engineering Southwest, Petroleum University, Chengdu 610500, PR China
| | - Zhiyu Huang
- College of Chemistry and Chemical Engineering Southwest, Petroleum University, Chengdu 610500, PR China
- Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu 610500, P. R. China
| | - Mengli Xiao
- College of Chemistry and Chemical Engineering Southwest, Petroleum University, Chengdu 610500, PR China
| | - Xiaojiang Li
- College of Chemistry and Chemical Engineering Southwest, Petroleum University, Chengdu 610500, PR China
| | - Wenjing Ma
- College of Chemistry and Chemical Engineering Southwest, Petroleum University, Chengdu 610500, PR China
| | - Ying Zhang
- College of Chemistry and Chemical Engineering Southwest, Petroleum University, Chengdu 610500, PR China
| | - Shanshan Dai
- College of Chemistry and Chemical Engineering Southwest, Petroleum University, Chengdu 610500, PR China
| | - Hongsheng Lu
- College of Chemistry and Chemical Engineering Southwest, Petroleum University, Chengdu 610500, PR China
- Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu 610500, P. R. China
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Wang Y, Wang H, Li C, Sun S, Hu S. CO2-responsive Pickering emulsion stablized by modified silica nanoparticles: A dissipative particle dynamics simulation study. J IND ENG CHEM 2021. [DOI: 10.1016/j.jiec.2021.03.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ma W, Dai S, Zhu P, Zhou R, Lu H. Dual CO 2 Responsiveness of an Oil-In-Water Emulsion by Using Sodium Oleate and Water-Soluble Tertiary Amines. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:750-758. [PMID: 33400537 DOI: 10.1021/acs.langmuir.0c03038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Two kinds of water-soluble tertiary amines (TAs), triethylamine (TEA, monoamine), and tetramethyltrimethylenediamine (TMA, diamine) were introduced into a NaOA stable oil-water (O/W) emulsion, respectively, and their dual reactivity to carbon dioxide was studied. TA was converted into bicarbonate after bubbling of CO2, which induced the increase of ionic strength of the aqueous phase, and formed ion pair with NaOA through electrostatic interaction. NaOA itself can also be protonated into oleic acid, which can be reverently deprotonated by alternating bubbles of CO2 at 25 °C and N2 at 50 °C, thus affecting the stability and demulsification process of the emulsion. In order to demonstrate TA's and NaOA's synergistic effect on CO2 responsiveness, gas chromatography-mass spectrometry, ζ potential, electrical conductivity, pH value, 1H nuclear magnetic resonance, morphological evolution, and interfacial tension were used to study the contributions of the single component and two components of NaOA, TEA, and TMA to emulsion stability and CO2 responsiveness, respectively. Combined with the composition distribution under different pH conditions, it was further proved that TAs had an effect on the stability and CO2 responsiveness of the NaOA emulsion.
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Affiliation(s)
- Wenjing Ma
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Shanshan Dai
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
- Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu 610500, P. R. China
| | - Peiyao Zhu
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Ru Zhou
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Hongsheng Lu
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
- Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu 610500, P. R. China
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Wang Y, Yan H, Zhong X, Yuan S. Computational investigation of a switchable emulsion stabilized by the mixture of a surfactant and tertiary amine. Phys Chem Chem Phys 2021; 23:368-377. [PMID: 33313634 DOI: 10.1039/d0cp05686c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics simulations were performed to investigate the CO2-responsiveness of an oil-in-water (O/W) emulsion stabilized by sodium oleate (NaOA) with a tertiary amine additive, named pentamethyl diethylenetriamine (PMA). The simulated results were in accordance with the experimental observations. That is, the surfactant NaOA itself can stabilize dodecane/water emulsions in aqueous solution, while the CO2-reponsiveness was strongly related to the added PMA. The electroneutral PMA molecules preferred to be located in the core region of the droplets. Thus, under the same conditions, the size of the droplet containing PMA is predictably larger than that without PMA. The increased extent of the charged surfactant headgroups distribution can increase the electrostatic repulsion between the droplets in the emulsion solution, which is the important reason why a much more stable emulsion is obtained by adding PMA. When PMA molecules were protonated to PMA2+ by bubbling CO2, they migrated from the interior to the surface of the droplets under electrostatic attraction, forming ion pairs with OA-. The binding between PMA2+ and OA- made the distribution of the surfactants very concentrated on the droplet surface, leading to large hydrophobic areas exposed to water. Besides, the hydration interactions of OA- headgroups decreased because they were covered by PMA2+. The calculated potential of mean force (PMF) confirmed that the electrostatic repulsion between droplets was crucial for the emulsion stabilization.
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Affiliation(s)
- Yue Wang
- School of Pharmacy, Liaocheng University, Liaocheng 252059, China.
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Liu D, Dai S, Wang L, Liu Y, Lu H. A tertiary amine group-based organogelator with pH-trigger recyclable property. NEW J CHEM 2021. [DOI: 10.1039/d1nj00656h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The separation and recovery of oils and organogelators can be easily realized by tuning the pH value.
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Affiliation(s)
- Dan Liu
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu
- P. R. China
| | - Shanshan Dai
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu
- P. R. China
- Oil and Gas Field Applied Chemistry Key Laboratory of Sichuan Province
| | - Li Wang
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu
- P. R. China
| | - Ya Liu
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu
- P. R. China
| | - Hongsheng Lu
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu
- P. R. China
- Oil and Gas Field Applied Chemistry Key Laboratory of Sichuan Province
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Lv X, Li X, Zhu P, Ge Y, Li Q, Lu H. Regulating redox and pH- responsive behavior of emulsion by varying alkane carbon number of tertiary amine. J DISPER SCI TECHNOL 2020. [DOI: 10.1080/01932691.2020.1857265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Xin Lv
- State Key Laboratory of Natural Gas Hydrates, Beijing, China
| | - Xiaojiang Li
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, P. R. China
| | - Peiyao Zhu
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, P. R. China
| | - Yang Ge
- State Key Laboratory of Natural Gas Hydrates, Beijing, China
| | - Qingping Li
- State Key Laboratory of Natural Gas Hydrates, Beijing, China
| | - Hongsheng Lu
- State Key Laboratory of Natural Gas Hydrates, Beijing, China
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, P. R. China
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Zhang L, Lu X, Liu X, Li Q, Cheng Y, Hou Q. Molecular dynamics simulation of CO 2-switchable surfactant regulated reversible emulsification/demulsification processes of a dodecane-saline system. Phys Chem Chem Phys 2020; 22:23574-23585. [PMID: 33057504 DOI: 10.1039/d0cp03904g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
CO2-Switchable surfactants are of great potential in a wide range of industrial applications related to their ability to stabilize and destabilize emulsions upon command. Molecular dynamics simulations have been performed to reveal the fundamental mechanism of the reversible emulsification/demulsification processes of a dodecane-saline system by a CO2-switchable surfactant that switches between active (i.e., N'-dodecyl-N,N-dimethylacetamidinium (DMAAH+)) and inactive (i.e., N'-dodecyl-N,N-dimethylacetamidine (DMAA)) forms. The density profiles indicate that DMAAH+ could increase the oil-water interfacial thickness to a greater extent compared to DMAA. DMAAH+ could sharply reduce the interfacial tension of the dodecane-saline system, while DMAA only exhibits a limited decrease, which is in accordance with the experimental observation that DMAAH+/DMAA can reversibly emulsify/demulsify alkane-water systems. Our simulations showed that both the number and lifetime of hydrogen bonds (HBs) between DMAA and water are almost equal to those between DMAAH+ and water. In DMAA, the N atom connecting with the alkyl tail acted as a HB acceptor, while the N atom attached by a proton in DMAAH+ acted as a HB donor. Furthermore, the HBs between DMAAH+ and HCO3- at the interfaces are relatively limited. Hence, it is deduced that the HBs are insufficient to achieve the CO2-switchability of DMAA/DMAAH+. The Lennard Jones and coulombic potentials between DMAA/DMAAH+ and other species show that the coulombic potentials between DMAAH+ and water or anions (i.e., Cl- and HCO3-) sharply decrease with the increase of DMAAH+ and are much lower than those in models with DMAA. The enhanced coulombic interactions between DMAAH+ and anions lead to a remarkable reduction in interfacial tension and the emulsification of the alkane-saline system. Therefore, coulombic interactions are of crucial importance to the reversible emulsification/demulsification processes regulated by CO2-switchable surfactants, namely DMAAH+/DMAA.
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Affiliation(s)
- Lihu Zhang
- State Key Laboratory for Ore Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China.
| | - Xiancai Lu
- State Key Laboratory for Ore Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China. and Key Lab of Surficial Geochemistry of Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China
| | - Xiandong Liu
- State Key Laboratory for Ore Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China.
| | - Qin Li
- State Key Laboratory for Ore Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China.
| | - Yongxian Cheng
- State Key Laboratory for Ore Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, P. R. China.
| | - Qingfeng Hou
- State Key Laboratory of Enhanced Oil Recovery, Research Institute of Petroleum Exploration and Development, China National Petroleum Corporation (CNPC), Beijing 100083, P. R. China
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Cao J, Zhao X, Ye L. Facile Method to Fabricate Superstrong and Tough Poly(vinyl alcohol) Hydrogels with High Energy Dissipation. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01083] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Jinlong Cao
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Xiaowen Zhao
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
| | - Lin Ye
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
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Zhu P, Liu D, Dai S, Wang B, Lu H, Huang Z. Redox and pH Dual-Responsive Emulsion Using Ferrocenecarboxylic Acid and N, N-Dimethyldodecylamine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2368-2374. [PMID: 31957456 DOI: 10.1021/acs.langmuir.9b03679] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The derivatives of ferrocene with redox properties are widely used. Some studies have used complex synthesis processes to obtain surfactants with redox properties. In order to simplify the synthesis process, FA-DMDA-Ox, a surfactant with redox and pH dual responses, was prepared by simple electrostatic interaction between ferrocenecarboxylic acid (FA) and N,N-dimethyldodecylamine (DMDA). A stable oil-in-water emulsion was prepared by using FA-DMDA-Ox at 25 °C. When sodium sulfite was added to the emulsion, the emulsion was demulsified. This was due to the oxidized ferrocene group that was reduced from the charged hydrophilic state to the uncharged hydrophobic state, which destroyed the original surface activity. In addition, when added HCl or NaOH to the emulsion changed pH, demulsification was caused by the dissociation of FA-DMDA-Ox.
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Affiliation(s)
- Peiyao Zhu
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Dongfang Liu
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Shanshan Dai
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
- Engineering Research Center of Oilfield Chemistry, Ministry of Education, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Baogang Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
- Oil & Gas Field Applied Key Chemistry Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Hongsheng Lu
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
- Engineering Research Center of Oilfield Chemistry, Ministry of Education, Southwest Petroleum University, Chengdu 610500, P. R. China
- Oil & Gas Field Applied Key Chemistry Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Zhiyu Huang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
- Engineering Research Center of Oilfield Chemistry, Ministry of Education, Southwest Petroleum University, Chengdu 610500, P. R. China
- Oil & Gas Field Applied Key Chemistry Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu 610500, P. R. China
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Guan X, Liu D, Lu H, Huang Z. CO2 responsive emulsions: Generation and potential applications. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123919] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Lu Y, Sun D, Ralston J, Liu Q, Xu Z. CO 2-responsive surfactants with tunable switching pH. J Colloid Interface Sci 2019; 557:185-195. [PMID: 31521968 DOI: 10.1016/j.jcis.2019.08.110] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/28/2019] [Accepted: 08/29/2019] [Indexed: 12/13/2022]
Abstract
HYPOTHESIS One of the major challenges in applying CO2-responsive surfactants concerns their tunable switchability and robustness under operating conditions. We hypothesize that combining monoethanolamine (MEA) with long-chain fatty acids (LCFAs) of variable chain lengths through electrostatic attraction could develop a series of CO2-responsive surfactants with tunable switching pH. EXPERIMENTS The tunability of switching pH for this group of surfactants was demonstrated by in situ probing of the CO2-responsive characteristics at the oil/water interface using dynamic interfacial tension (IFT) measurements. Two protocols were applied to distinguish interfacial response and solution response. The key importance of interfacial response was demonstrated by two essential applications of CO2-responsive surfactants: demulsification of stable emulsions, and alternation of the interfacial properties of ultra-heavy crude oil-water interfaces. FINDINGS The switching pH of the CO2-responsive surfactants was controlled by the hydrocarbon chain length of LCFAs. More importantly, their switching behaviour was found to be different at the interface and in the bulk solution, which is attributed to the enhanced molecular interactions at the interface. Since most applications require surfactants to be switched at the interface, it is thereby most appropriate to determine the switching pH through their interfacial responses.
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Affiliation(s)
- Yi Lu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
| | - Dejun Sun
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, Shandong 250100, PR China.
| | - John Ralston
- Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia.
| | - Qingxia Liu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
| | - Zhenghe Xu
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada; Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China.
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Yuan X, Li Z, Feng Y, Pei Y, Wang H, Liu D, Wang D, Wang J. Phase behavior and microstructure of azobenzene ionic liquids based photo-responsive microemulsions. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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