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Wang S, Xu Y, Fang Y, Liu X. Redox-switchable microemulsions with efficient phase separation and surfactant recycling. J Colloid Interface Sci 2024; 672:363-369. [PMID: 38850863 DOI: 10.1016/j.jcis.2024.06.013] [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: 12/10/2023] [Revised: 05/19/2024] [Accepted: 06/02/2024] [Indexed: 06/10/2024]
Abstract
HYPOTHESIS Switchable microemulsions (MEs) are those capable of adaptively responding to the action of internal or external stimuli. For redox-switchable MEs to obtain high-efficiency phase separation and surfactant recycling, it may be one of the keys to adequately turn off the interfacial activity of surfactants and reduce the solubility of the closed surfactants in the oil phase. EXPERIMENTS Monophasic MEs consisting 11-butylselanyl-undecyl sulfate sodium (C4SeC11SO4Na), n-butanol, n-octane, and water were fabricated using the pseudo-ternary phase diagram method. Their structural features and droplets size were characterized by conductivity, dynamic light scattering (DLS) and cryogenic transmission electron microscopy (cryo-TEM), respectively. The redox response of MEs was studied using a combination of visual observations and DLS, cryo-TEM, nuclear magnetic resonance (NMR) and thin-layer tomography. The efficient recycling of C4SeC11SO4Na from a well-emulsified eluent is conceptually demonstrated. FINDINGS The reversible transition between C4SeC11SO4Na and C4SeOC11SO4Na is achieved under the alternating action of H2O2 and N2H4, by which C4SeC11SO4Na-based monophasic MEs are able to efficiently demulsify and regenerate, respectively, regardless of their type. After H2O2-induced demulsification of the MEs, C4SeOC11SO4Na can be efficiently recycled with the water phase. We hope that such a redox-switching method may benefit some technological applications. For example, it offers exciting possibilities for simultaneous recycling C4SeC11SO4Na and removal of oil from a well-emulsified eluent. Around 97.1 ± 0.3 % of C4SeC11SO4Na could be recycled over five cycles with no apparent loss. After a simple and conventional treatment with anion-exchange resin and active carbon, the total organic carbon and chemical oxygen demand of the waste water were 17.4 ± 2.8 and 26.2 ± 1.4 mg/L, respectively.
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Affiliation(s)
- Shuyu Wang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China
| | - Yanjie Xu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China
| | - Yinjun Fang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China; Zanyu Technology Group Co. Ltd., Hangzhou 310009, PR China
| | - Xuefeng Liu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China.
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Shang Z, Xu P, Feng T, Sun Y, He K, Li G, Li X. Probe into a novel surfactant-free microemulsion system of ethylene glycol monobutyl ether + water + diesel for crude oil removal and recovery from oily sludge. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 945:174037. [PMID: 38901590 DOI: 10.1016/j.scitotenv.2024.174037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 06/03/2024] [Accepted: 06/14/2024] [Indexed: 06/22/2024]
Abstract
A novel surfactant-free microemulsion (SFME) system was proposed in this study, and applied in the crude oil removal and recovery from oily sludge (OS). Based on an investigation of the SFME phase behavior and solution properties, a complete ternary phase diagram was constructed. The SFME with three-liquid phase equilibrium (Winsor III type) was selected for the treatment of OS to achieve simultaneous efficient removal (up to 95.1 %) and recovery (up to 83.2 %) of crude oil. The SFME could be reused continuously for OS treatment without purification. The removal efficiency could still keep >75.9 % after 5 times of reuse, showing high reusability. The detached crude oil could be automatically recovered based on the phase equilibrium principle without additional separation. In the washing experiments, single-factor and multi-factor orthogonal tests were applied to investigate the effects of different experimental conditions on oil removal efficiency and determine the optimal experimental scheme. The treated OS was sufficiently decontaminated according to the morphology, composition, and properties analysis by scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis and contact angle. The composition of the recovered crude oil was identical to that of commercial crude oil according to gas chromatography-mass spectrometry analysis, showing a high recovery value. The kinetic analysis revealed that crude oil desorption experienced three main stages: membrane diffusion, intra-particle diffusion and surface desorption, and identified the chemisorption was the main interaction between the oil-soil. Finally, the mechanism of SFME action was assessed for dissolution and activation based on ultra-low IFT.
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Affiliation(s)
- Zhijie Shang
- Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Pan Xu
- Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Tongtong Feng
- Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Yapeng Sun
- Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Kaifan He
- Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Guoxuan Li
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Box 266, Beijing 100029, PR China
| | - Xinxue Li
- Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
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Liu L, Zhang M, Lu Y, Chen G, Lu B, Ge L, Lu Z, Sun D, Xu Z. Microstructure-dependent CO 2-responsive microemulsions for deep-cleaning of oil-contaminated soils. CHEMOSPHERE 2024; 350:140928. [PMID: 38092174 DOI: 10.1016/j.chemosphere.2023.140928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 12/04/2023] [Accepted: 12/07/2023] [Indexed: 12/30/2023]
Abstract
CO2-responsive microemulsion (ME) is considered a promising candidate for deep-cleaning and oil recovery from oil-contaminated soils. Understanding the responsive nature of different microstructures (i.e., oil-in-water (O/W), bicontinuous (B.C.) and water-in-oil (W/O)) is essential for unlocking the potential and mechanisms of CO2-responsive emulsions in complex multiphase systems and providing comprehensive guidance for remediation of oil-contaminated soils. Herein, the responsiveness of microstructures of ME to CO2 trigger was investigated using experimental designs and coarse-grained molecular dynamic simulations. MEs were formed for the first time by a weakly associated pseudo-Gemini surfactant of indigenous organic acids (naphthenic acids, NAs are a class of natural surface-active molecules in crude oil) and tetraethylenepentamine (TEPA) through fine tuning of co-solvent of dodecyl benzene sulfonic acid (DBSA) and butanol. The O/W ME exhibited an optimal CO2-responsive character due to easier proton migration in the continuous aqueous phase and more pronounced dependence of configuration on deprotonated NA ions. Conversely, the ME with W/O microstructure exhibited a weak to none responsive characteristic, most likely attributed to its high viscosity and strong oil-NA interactions. The O/W ME also showed superior cleaning efficiency and oil recovery from oil-contaminated soils. The results from this study provide insights for the design of CO2-responsive MEs with desired performance and guidance for choosing the favorable operating conditions in various industrial applications, such as oily solid waste treatment, enhanced oil recovery (EOR), and pipeline transportation. The insights from this work allow more efficient and tailored design of switchable MEs for manufacturing advanced responsive materials in various industrial sectors and formulation of household products.
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Affiliation(s)
- Lingfei Liu
- Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China; Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Mingshan Zhang
- School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China
| | - Yi Lu
- Bioproducts Institute, Department of Chemical and Biological Engineering, Department of Chemistry and Department of Wood Science, University of British Columbia, Vancouver, BC, V6T 1Z3, Canada
| | - Gaojian Chen
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225009, China
| | - Binda Lu
- Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China; Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Lingling Ge
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225009, China
| | - Zhouguang Lu
- Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China; Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Dejun Sun
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, Shandong, 250100, China
| | - Zhenghe Xu
- Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials, Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China; Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong, Southern University of Science and Technology, Shenzhen, 518055, China.
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Zhang Z, Peng B, Zhang Y, Xiong J, Li J, Liu J. Switchable Pickering Emulsions Stabilized via Synergistic Nanoparticles-Superamphiphiles Effects and Rapid Response to CO 2/N 2. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1604-1612. [PMID: 38183283 DOI: 10.1021/acs.langmuir.3c02206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2024]
Abstract
A CO2/N2-responsive emulsion provides milder reaction conditions, nontoxicity, and economic feasibility compared to other switchable surfactants. In this study, CO2/N2-responsive pickering emulsions were fabricated by using a compounded dispersion containing SiO2 nanoparticles (NPs) and superamphiphiles as the emulsifying agents. The synergistic effects of the SiO2 NPs and superamphiphiles significantly stabilized the emulsion at all of the tested concentrations and prevented complete phase separation of oil and water. The electrostatic interaction between the SiO2 NPs and superamphiphiles was disrupted after bubbling with CO2 for 30 s, resulting in the breaking of the emulsion. However, the dispersion recovered its interfacial activity after the introduction of N2 and again emulsified the emulsion. This reversible switching behavior was validated through three consecutive cycles of bubbling CO2/N2. The protonation and deprotonation of the SiO2 NPs and superamphiphiles in response to CO2/N2 facilitated reversible assembly and disassembly, which enabled the switching of the emulsions between inactive and active forms. The novel highly stable Pickering emulsions demonstrated rapid demulsification and emulsification in response to CO2/N2 and are promising for a wide range of applications.
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Affiliation(s)
- Zhenghao Zhang
- Beijing Key Laboratory for Greenhouse Gas Storage and CO2-EOR, Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Bo Peng
- Beijing Key Laboratory for Greenhouse Gas Storage and CO2-EOR, Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Yupeng Zhang
- Beijing Key Laboratory for Greenhouse Gas Storage and CO2-EOR, Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Jiaxin Xiong
- Beijing Key Laboratory for Greenhouse Gas Storage and CO2-EOR, Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Jingwei Li
- Beijing Key Laboratory for Greenhouse Gas Storage and CO2-EOR, Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
| | - Jianwei Liu
- Beijing Key Laboratory for Greenhouse Gas Storage and CO2-EOR, Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China
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Zhao Z, Zhang L, Zhang H, Lu G, Meng T, Hao H, Zhang Y, Li J, Yan H. Computational Insights into a CO 2-Responsive Emulsion Prepared Using the Superamphiphile Assembled by Electrostatic Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:938-949. [PMID: 38134444 DOI: 10.1021/acs.langmuir.3c03140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2023]
Abstract
The superamphiphiles exhibit broad prospects for fabricating stimuli-responsive emulsions. Because the superamphiphiles are assembled via noncovalent interactions, they have the advantage of fast response and high efficiency. Recently, a series of switchable emulsions using CO2-responsive superamphiphiles have been developed, which extends the applications of CO2-responsive materials in widespread field. However, there is still a lack of fundamental understanding on the switching mechanism related to the assembled structure of superamphiphiles at the oil-water interface. We employed molecular dynamics (MD) simulations to investigate the reversible emulsification/demulsification process of a responsive emulsion system stabilized by a recently developed responsive superamphiphile (BTOA), which consists of oleic acid (OA) and cationic amine (named 1,3-bis(aminopropyl)tetramethyldisiloxane, BT). The simulation results present the morphologies in both the emulsion and demulsification states. It is found that the ionized OA- and the protonated BT+ together form an adsorption layer at the oil-water interface. The hydrophobic parts of BT+ are inserted into the adsorption layer, and the two amine groups contact the water phase. This adsorption layer reduces the interfacial tension and stabilizes the emulsion. After the bubbling of CO2, the surfactants were fully protonated to OA and BT2+. Because of the changes in the molecular polarity, OA and BT2+ entered the oil and water phases, respectively, resulting in demulsification. The structural and dynamical properties were analyzed to reveal the different intermolecular interactions that were responsible for the reversible reversibility of the emulsion. The observations are considered to be complementary to experimental studies and are expected to provide deeper insights into studies on developing responsive materials via supramolecular assemblies.
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Affiliation(s)
- Zhen Zhao
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, P. R. China
| | - Lu Zhang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, P. R. China
| | - Hao Zhang
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, P. R. China
| | - Guoqiang Lu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, No. 1800 Lihu Avenue, Wuxi 214122, P. R. China
| | - Tong Meng
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, P. R. China
| | - Hongguo Hao
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, P. R. China
| | - Yongmin Zhang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, No. 1800 Lihu Avenue, Wuxi 214122, P. R. China
| | - Jun Li
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, P. R. China
| | - Hui Yan
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng, Shandong 252059, P. R. China
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Wang H, Wang W, Zhu G, Cao Y, Zhang L. A perspective of microemulsions in critical metal separation and recovery: Implications for potential application of CO 2-responsive microemulsions. CHEMOSPHERE 2023; 338:139494. [PMID: 37451640 DOI: 10.1016/j.chemosphere.2023.139494] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 07/01/2023] [Accepted: 07/11/2023] [Indexed: 07/18/2023]
Abstract
Since the discovery of microemulsions, they have attracted great attention due to its unique properties, such as ultra-low interfacial tension and nanoscale droplets. During the past several decades, microemulsions have shown unparalleled advantages in critical metal separation and recovery, e.g., high separation rate, high recovery efficiency, and good selectivity. Therefore, fundamental understandings of such metal recovery behavior are of great significance for the continuous development of microemulsion-based separation technology in this field. Herein, we first systematically reviewed the application of regular microemulsion in the separation and recovery process of critical metals focusing on their separation mechanisms. Then, we summarized the recent progress of CO2-responsive microemulsions and highlighted their potential application in critical metal separation and recovery, aiming to provide some insights into alleviating the difficulties in demulsification during the stripping stage using regular microemulsions. In this section, the latest development of CO2-responsive microemulsions is introduced, and the relationship between their composition, microstructure and macroscopic properties is discussed. Discussion and future perspectives are provided highlighting the design of new microemulsions and potential application of CO2-responsive microemulsions for metal separation and recovery in the future.
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Affiliation(s)
- Haoxuan Wang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Wei Wang
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, Henan, China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Guangli Zhu
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Yijun Cao
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, Henan, China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China.
| | - Ling Zhang
- Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou, 450001, Henan, China; School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China.
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Feng X, Guo S, Wen F, Zhu W, Yang X, Gu M, Shi N, Li Z, Lou B, Liu D. New insight into desorption behavior and mechanism of oil from aged oil-contaminated soil in microemulsion. JOURNAL OF HAZARDOUS MATERIALS 2023; 451:131108. [PMID: 36913749 DOI: 10.1016/j.jhazmat.2023.131108] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 02/21/2023] [Accepted: 02/26/2023] [Indexed: 06/18/2023]
Abstract
The intractable nature of oil-contaminated soil (OS) constitutes the chief limiting factor for its remediation. Herein, the aging effect (i.e., oil-soil interactions and pore-scale effect) was investigated by analyzing the properties of aged OS and further demonstrated by investigating the desorption behavior of the oil from the OS. XPS was performed to detect the chemical environment of N, O, and Al, indicating the coordination adsorption of carbonyl groups (oil) on the soil surface. Alterations in the functional groups of the OS were detected using FT-IR, indicating that the oil-soil interactions were enhanced via wind-thermal aging. SEM and BET were used to analyze the structural morphology and pore-scale of the OS. The analysis revealed that aging promoted the development of the pore-scale effect in the OS. Moreover, the desorption behavior of oil molecules from the aged OS was investigated via desorption thermodynamics and kinetics. The desorption mechanism of the OS was elucidated via intraparticle diffusion kinetics. The desorption process of oil molecules underwent three stages: film diffusion, intraparticle diffusion, and surface desorption. Owing to the aging effect, the latter two stages constituted the major steps for controlling oil desorption. This mechanism provided theoretical guidance to apply microemulsion elution for remedying industrial OS.
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Affiliation(s)
- Xiaoning Feng
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China
| | - Shuhai Guo
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110011, China
| | - Fushan Wen
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China
| | - Wei Zhu
- Sinopec Petroleum Engineering Co., Ltd., Dongying 257026, China
| | - Xiujie Yang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China.
| | - Meixia Gu
- Sinopec Petroleum Engineering Co., Ltd., Dongying 257026, China
| | - Nan Shi
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China.
| | - Zhiheng Li
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China
| | - Bin Lou
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China
| | - Dong Liu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China.
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Zhang Y, Mu M, Zhou Y, Xie H, Zhao S. Redox-responsive microemulsion: Fabrication and application to curcumin encapsulation. J Colloid Interface Sci 2023; 647:384-394. [PMID: 37269735 DOI: 10.1016/j.jcis.2023.05.129] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 04/20/2023] [Accepted: 05/18/2023] [Indexed: 06/05/2023]
Abstract
HYPOTHESIS Stimulus-responsive microemulsions have aroused significant attention because of their versatile and reversible switchability between stable and unstable states. However, most stimuli-responsive microemulsions are based on stimuli-responsive surfactants. We posit that the change in the hydrophilicity of a selenium-containing alcohol triggered by a mild redox reaction could also influence the stability of microemulsions and provide a new nanoplatform for the delivery of bioactive substances. EXPERIMENTS A selenium-containing diol (3,3'-selenobis(propan-1-ol), PSeP) was designed and used as a co-surfactant in a microemulsion with ethoxylated hydrogenated castor oil (HCO40), diethylene glycol monohexyl ether (DGME), 2-n-octyl-1-dodecanol (ODD) and water. The redox-induced transition in PSeP was characterized by 1H NMR, 77Se NMR, and MS. The redox-responsiveness of the ODD/HCO40/DGME/PSeP/water microemulsion was investigated through determination of a pseudo-ternary phase diagram, analysis by dynamic light scattering, and electrical conductivity, and its encapsulation performance was evaluated by determination of the solubility, stability, antioxidant activity, and skin penetrability of encapsulated curcumin. FINDINGS The redox conversion of PSeP enabled efficient switching of ODD/HCO40/DGME/PSeP/water microemulsions. Addition of oxidant (H2O2), oxidized PSeP into more hydrophilic PSeP-Ox (selenoxide), disrupting the emulsifying capacity of the combination of HCO40/DGME/PSeP, markedly reducing the monophasic microemulsion region in the phase diagram, and inducing phase separation in some formulations. Addition of reductant (N2H4·H2O), reduced PSeP-Ox and restored the emulsifying capacity of the combination of HCO40/DGME/PSeP. In addition, PSeP-based microemulsions can significantly enhance the solubility in oil (by 23 times), stability, antioxidant capacity (DPPH∙ radical scavenging by 91.74 %), and skin penetrability of curcumin, showing clear potential for encapsulation and delivery of curcumin and other bioactive substances.
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Affiliation(s)
- Yongmin Zhang
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, PR China; Key Laboratory of Green Cleaning Technology and Detergents of Zhejiang Province, Hangzhou 310056, PR China.
| | - Meng Mu
- Petroleum Engineering Technology Research Institute of Shengli Oilfield, SINOPEC, Dongying, Shandong 257067, China
| | - Yue Zhou
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, PR China
| | - Huan Xie
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, PR China
| | - Shanjuan Zhao
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, PR China
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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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Wu Y, Yue W, Li H, Li X, Lu H. CO 2-Repurification Microemulsion Detergent for Oil-Based Slurry Cleaning. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:4967-4974. [PMID: 37000603 DOI: 10.1021/acs.langmuir.2c03445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
In order to solve problems such as environmental pollution and pipeline blockage caused by oily wastewater after washing, N,N-dimethylcyclohexylamine (DMCHA) with CO2 response was selected as the oil phase, and an O/W microemulsion wellbore cleaning fluid with CO2 switching characteristics was successfully prepared with erucamide propyl betaine (EAB-40), sodium dodecyl benzene sulfonate (SDBS), n-butanol, silicone defoamer, and water. The water content of the microemulsion was 89.99%, and it had good stability at 40 and -5 °C. The emulsion was rapidly demulsified after being injected with CO2 in the CO2-repurification microemulsion detergent, and CO2 was removed with a N2 detergent. The emulsion was restored to its original state, which demonstrated the CO2/N2 switching properties of the emulsion. It is proven that the switching microemulsion has a good wetting transformation ability by cleaning the steel sheet and quartz sheet contaminated by oil-based slurry. The switching microemulsion system can clean the simulated wellbore contaminated by oil-based slurry, and the cleaning efficiency is above 99%. CO2 can be used at room temperature to separate oil and water from oily wastewater after cleaning.
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Affiliation(s)
- Yang Wu
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu 610500, P. R. China
- 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
| | - Wenjian Yue
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Hanmin Li
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Xiaojiang Li
- Chongqing University of Science & Technology, Chongqing 401331, China
| | - Hongsheng Lu
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu 610500, P. R. China
- 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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Jiang G, Li J, Yu J, Jiang H, Li H, Xu B, Zhao L, Wang H. Research on the influencing factors and mechanism of single-phase microemulsion cleaning of shale gas oil-based cuttings. ENVIRONMENTAL TECHNOLOGY 2022; 43:2530-2539. [PMID: 33522890 DOI: 10.1080/09593330.2021.1884902] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 01/28/2021] [Indexed: 06/12/2023]
Abstract
Oil-based cuttings (OBCs) produced by shale gas exploitation are classified as hazardous waste. Their appropriate utilization and disposal is a key issue that urgently needs to be resolved. A single-phase microemulsion (SPM) has ultra-low interfacial tension and strong solubilization ability. In view of this, based on an analysis of the characteristics of OBCs, SPMs have been selected for their cleaning. The effects of microemulsion components and other conditions on the cleaning efficacy have been explored, as well as the deoiling mechanism and the recycling efficiency of the SPM. Our results have shown that sodium dodecylbenzene sulfonate (SDBS), n-butanol, water, and white oil in appropriate proportions can form an effective SPM. The oil content (OC) of OBCs after cleaning was reduced from 11.89% (±0.32%) to 1.13% (±0.02%) when the proportions of the aforementioned components of the SPM were 14.3%, 14.3%, 66.6%, and 4.8%, respectively. The OC of the residue further decreased to 0.28% (±0.05%) after a second cleaning with an alkaline solution. The optimum SPM conditions for cleaning OBCs were identified as a stirring speed of 200 rpm, a temperature of 30 °C, a cleaning time of 30 min, and a solid to liquid mass to volume ratio of 1:4. The main mechanism whereby the SPM cleans the OBCs is that the former reduces the combined work and adhesion work required for the removal of oil droplets from the cuttings, so that the adhesive oil is easily gathered up. Furthermore, the gathered oil phase is solubilized by the SPM.
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Affiliation(s)
- Guobin Jiang
- Safety, Environment and Technology Supervision Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, People's Republic of China
- Sichuan Key Laboratory of Evaluation and Exploitation of Shale Gas, Chengdu, People's Republic of China
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, People's Republic of China
| | - Jing Li
- Safety, Environment and Technology Supervision Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, People's Republic of China
- Sichuan Key Laboratory of Evaluation and Exploitation of Shale Gas, Chengdu, People's Republic of China
| | - Jinlei Yu
- Safety, Environment and Technology Supervision Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, People's Republic of China
- Sichuan Key Laboratory of Evaluation and Exploitation of Shale Gas, Chengdu, People's Republic of China
| | - Huashan Jiang
- Safety, Environment and Technology Supervision Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, People's Republic of China
- Sichuan Key Laboratory of Evaluation and Exploitation of Shale Gas, Chengdu, People's Republic of China
| | - Hui Li
- Safety, Environment and Technology Supervision Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, People's Republic of China
- Sichuan Key Laboratory of Evaluation and Exploitation of Shale Gas, Chengdu, People's Republic of China
| | - Bo Xu
- Safety, Environment and Technology Supervision Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, People's Republic of China
- Sichuan Key Laboratory of Evaluation and Exploitation of Shale Gas, Chengdu, People's Republic of China
| | - Liang Zhao
- Safety, Environment and Technology Supervision Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, People's Republic of China
- Sichuan Key Laboratory of Evaluation and Exploitation of Shale Gas, Chengdu, People's Republic of China
| | - Hongjuan Wang
- Safety, Environment and Technology Supervision Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, People's Republic of China
- Sichuan Key Laboratory of Evaluation and Exploitation of Shale Gas, Chengdu, People's Republic of China
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Yan Y, Li Y, Wang J, Li L, Tang F. A carbon dioxide responsive fluorescent system based on micellar transformation. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Zhou M, Huang J, Zhao Y, Deng X, Ni R, Zhao Y, He Y. Synthesis and Physicochemical Properties of CO2-switchable Gemini Surfactants. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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The key to surfactant-free microemulsion demulsification: CO2 promotes the transfer of amphiphilic solvent to aqueous phase. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117000] [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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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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Lu Y, Zhu Y, Yang F, Xu Z, Liu Q. Advanced Switchable Molecules and Materials for Oil Recovery and Oily Waste Cleanup. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2004082. [PMID: 34047073 PMCID: PMC8336505 DOI: 10.1002/advs.202004082] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 01/19/2021] [Indexed: 05/07/2023]
Abstract
Advanced switchable molecules and materials have shown great potential in numerous applications. These novel materials can express different states of physicochemical properties as controlled by a designated stimulus, such that the processing condition can always be maintained in an optimized manner for improved efficiency and sustainability throughout the whole process. Herein, the recent advances in switchable molecules/materials in oil recovery and oily waste cleanup are reviewed. Oil recovery and oily waste cleanup are of critical importance to the industry and environment. Switchable materials can be designed with various types of switchable properties, including i) switchable interfacial activity, ii) switchable viscosity, iii) switchable solvent, and iv) switchable wettability. The materials can then be deployed into the most suitable applications according to the process requirements. An in-depth discussion about the fundamental basis of the design considerations is provided for each type of switchable material, followed by details about their performances and challenges in the applications. Finally, an outlook for the development of next-generation switchable molecules/materials is discussed.
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Affiliation(s)
- Yi Lu
- Department of Chemical and Materials EngineeringUniversity of AlbertaEdmontonAlbertaT6G 1H9Canada
| | - Yeling Zhu
- Department of Chemical and Materials EngineeringUniversity of AlbertaEdmontonAlbertaT6G 1H9Canada
| | - Fan Yang
- College of New Materials and New EnergiesShenzhen Technology UniversityShenzhen518118P. R. China
| | - Zhenghe Xu
- Department of Chemical and Materials EngineeringUniversity of AlbertaEdmontonAlbertaT6G 1H9Canada
- Department of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen518055P. R. China
| | - Qingxia Liu
- Department of Chemical and Materials EngineeringUniversity of AlbertaEdmontonAlbertaT6G 1H9Canada
- College of New Materials and New EnergiesShenzhen Technology UniversityShenzhen518118P. R. China
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Su L, Sun J, Ding F, Gao X, Zheng L. Molecular insight into photoresponsive surfactant regulated reversible emulsification and demulsification processes. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116218] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Zhou Y, He S, Li H, Zhang Y. CO 2 and Temperature Control over Nanoaggregates in Surfactant-Free Microemulsion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1983-1990. [PMID: 33512168 DOI: 10.1021/acs.langmuir.0c03527] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Smart microemulsions (MEs) recently have attracted significant interests. However, MEs, especially surfactant-free MEs (SFMEs) that respond to more than one stimulus, are rarely reported to date. Here, we reported the first example of dual-responsive SFME in which a CO2-sensitive hydroxyethylamine was used as an amphisolvent. This SFME was investigated utilizing ternary phase diagram, dynamic light scattering, and UV-visible spectrum techniques. It was found that three hydroxyethylamines could stabilize the octanol-water mixture to form transparent and isotropic SFMEs including nanoaggregates-rich pre-ouzo zone, regardless of the number of the hydroxyl group. Among them, 2-(dimethyl amino) ethanol (DMEA)-based SFME possesses the largest single-phase region and most sensitive to CO2 and the changes in temperature. With bubbling of CO2/N2 or decreasing/increasing temperature, both the single-phase region and pre-ouzo zone reversibly shrink and expand, as well as with breathing. However, CO2/N2-induced change is more significant than that induced by temperature. The former is mainly ascribed to the reversible protonation and deprotonation of DMEA, while the latter is generally interpreted as the effects of temperature on hydrogen bond interaction. Note that CO2 leads to a thorough demusification from Winsor IV ME to oil-rich and water-rich two phases without nanoaggregates, while cooling only causes to a particular phase separation, producing two new MEs phases, not typical Winsor I or II MEs. Such a unique dual-responsive SFME can not only be applied in the remediation of contaminated soil, drug delivery, and nanoparticles preparation but also opens a new door to switchable emulsion.
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Affiliation(s)
- Yue Zhou
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Shuai He
- College of Chemistry and Environmental Protection Engineering, Southwest Minzu University, Chengdu 610041, P. R. China
| | - Huanhuan Li
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Yongmin Zhang
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China
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Zhao Y, Shi L, Qiu J, Pei Y, Wang H, Li Z, Fan J, Wang J. Mechanism of emulsification and demulsification for temperature-sensitive ionic liquid microemulsion. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114352] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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21
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Li R, Manica R, Lu Y, Xu Z. Role of surfactants in spontaneous displacement of high viscosity oil droplets from solid surfaces in aqueous solutions. J Colloid Interface Sci 2020; 579:898-908. [PMID: 32711230 DOI: 10.1016/j.jcis.2020.06.069] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/14/2020] [Accepted: 06/15/2020] [Indexed: 10/24/2022]
Abstract
HYPOTHESIS Displacement of oil droplets receding from solid surfaces in aqueous solutions plays a critical role in many household activities and industrial operations. Surfactants are often involved in these activities to control the displacement process. We hypothesize that the influence of surfactants on the displacement process of oil is highly dependent on the type and dosage of surfactants, with the mechanisms being elucidated by the analysis using appropriate dynamic wetting models. EXPERIMENTS We systematically investigated the spontaneous displacement of a high viscosity oil on curved hydrophilic glass surfaces in aqueous solutions of anionic sodium dodecylbenzene sulfonate, cationic hexadecyl trimethyl ammonium bromide, and nonionic TritonTM X-100 over a wide range of concentrations. FINDINGS The rather different oil displacement behaviors were observed with different surfactant additions. The displacement dynamics of the receding oil droplet was found to be inhibited by surfactant additions and followed two distinct models quantitatively: the power-law model describing the temporal evolution of early-stage displacement, and the molecular kinetic model describing the dependence of the three-phase contact line displacement velocity on the dynamic contact angle at the late stage of oil displacement. The model-based data analysis provided insights on the role of surfactants in controlling the oil displacement dynamics.
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Affiliation(s)
- Rui Li
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
| | - Rogerio Manica
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
| | - Yi Lu
- 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, China.
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23
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Wang L, Guan X, Zheng C, Wang N, Lu H, Huang Z. New Low-Energy Method for Nanoemulsion Formation: pH Regulation Based on Fatty Acid/Amine Complexes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:10082-10090. [PMID: 32787050 DOI: 10.1021/acs.langmuir.0c01233] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Phase inversion composition methods and phase inversion temperature methods are the common methods for nanoemulsion formation. The mechanisms governing both PIC and PIT are the same: composition or temperature can trigger a change in the surfactant spontaneous curvature during the emulsification process. It is anticipated that pH may also induce a change in the spontaneous curvature of pH-responsive surfactants to prepare nanoemulsions. Therefore, fatty acid/amine complexes were synthesized through electrostatic interactions. Based on these complexes, nanoemulsions were successfully prepared by pH regulation. Electrical conductivity and pH measurements were employed to determine the phase inversion process. Dynamic light scattering, digital fluorescence microscopy, and transmission electron microscopy were employed to characterize the droplet size and morphology of the nanoemulsion. The effects of complex concentration, NaCl concentration, and pH of the system were investigated. The developed method, phase inversion pH (PIpH) method, is a moderate and easy-control method. Using this method, the size distributions of nanoemulsion are monomodal and narrow. Nanoemulsion prepared by PIpH has a unique pH-responsive behavior that can be controllably regulated among nanoemulsions, emulsions, and phase separation systems.
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Affiliation(s)
- Li Wang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Xueqian Guan
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Cunchuan Zheng
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
| | - Na Wang
- 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
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu 610500, P. R. China
| | - Zhiyu Huang
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu 610500, P. R. China
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, P. R. China
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Zhang Y, Chen X, Zhu B, Zhou Y, Liu X, Yang C. Temperature-Switchable Surfactant-Free Microemulsion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7356-7364. [PMID: 32527085 DOI: 10.1021/acs.langmuir.0c00828] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Stimuli-responsive microemulsions have recently attracted significant interest due to their unique properties. Here, we developed a novel surfactant-free microemulsion (SFME) in a nontoxic ternary mixture, in which dimethyl sulfoxide (DMSO) was used as an amphisolvent, n-butanol was used as a nonpolar phase, and water was used as a polar phase. The DLS results confirmed the presence of the preouzo zone, and the polarity experiment revealed that the single-phase region can be further divided into oil-in-water, bicontinuous, and water-in-oil subregions. The size of droplets increased upon increasing the water or n-butanol content but decreased with increasing DMSO content. With increasing temperature, the area of the single-phase region increased, accompanied by a decrease in the size of the droplets, and the critical point moved to the corner of n-butanol. No matter in what subregion the formulation was found, decreasing temperature to below the phase-transition temperature (PTT) will induce a transition from monophasic MEs to complete phase separation and vice versa. This is mainly attributed to the effect of temperature on the hydrogen-bond interaction. Ag nanoparticles (Ag NPs) can be prepared above the PTT and facilely separated below PTT. The Ag NPs obtained from the current SFME showed higher catalytic activity than that obtained from a common surfactant-based ME.
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Affiliation(s)
- Yongmin Zhang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Xuelian Chen
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Bo Zhu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Yue Zhou
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Xuefeng Liu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China
| | - Cheng Yang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering, Jiangnan University, Wuxi 214122, P. R. China
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Chen A, Liu X, Wu Y, Luo G, Xu JH. Interactions between CO 2-Responsive Switchable Emulsion Droplets Determined by Using Optical Tweezers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4600-4606. [PMID: 32299211 DOI: 10.1021/acs.langmuir.0c00203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
CO2-responsive switchable emulsions have been of great interest in some industrial processes where the stability of the emulsion is only required temporarily, such as oil transport, drug delivery, and fossil fuel production. The good understanding of the stability and instability mechanism is vital to the switchable behavior between emulsification and demulsification. Herein, a novel approach was developed to determine the interactions between two switchable emulsion droplets directly by a dual-laser optical tweezers instrument. The repulsive force between a couple of tetradecane droplets occurs to increase progressively with the increasing concentration of switchable surfactant in solutions. However, the repulsive force appears to decrease progressively in turn when the switchable surfactant concentration is far higher than the critical micelle concentration (CMC). Moreover, the depletion effect starts to emerge in the higher surfactant concentration which is attributed to the switchable surfactant micelles generated in solutions. In addition, according to the measurements of interaction forces, a mechanism of the switchable behavior is well proposed, which is established by the principle of self-assembly/detachment of the switchable surfactant, resulting in the weakening and re-enhancing of the electrostatic double-layer (EDL) repulsive forces between tetradecane droplets, upon selective introduction and removal of CO2. Based on this work, a novel perspective was provided to study the switchable emulsion, which can contribute instructive messages for the understanding of stability and instability mechanisms of switchable emulsions.
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Affiliation(s)
- An Chen
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Xueyan Liu
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Yuxin Wu
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Guangsheng Luo
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Jian-Hong Xu
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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CO 2/N 2-responsive oil-in-water emulsions using a novel switchable surfactant. J Colloid Interface Sci 2020; 571:134-141. [PMID: 32199266 DOI: 10.1016/j.jcis.2020.03.045] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 03/10/2020] [Accepted: 03/11/2020] [Indexed: 11/23/2022]
Abstract
HYPOTHESIS Recently, switchable or stimuli-responsive emulsions have attracted much research interest in many industrial fields. In this work, a novel CO2/N2-responsive surfactant was designed and developed to facilitate the formation of switchable oil-in-water (O/W) emulsions with fast switching characteristics between a stable emulsion and separate phases upon alternatively bubbling CO2 and N2. EXPERIMENTS The novel CO2/N2-responsive surfactant was facilely prepared by mixing an anionic fatty acid (oleic acid) and a cationic amine (1,3-Bis (aminopropyl) tetramethyldisiloxane) at a 1:1 molecular ratio, which was assembled based on electrostatic interactions. The structure and properties of the novel CO2/N2-responsive switchable surfactant were investigated by Fourier-transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H NMR) spectroscopy, and interfacial tensions. FINDINGS The developed surfactant shows an excellent interfacial activity at the oil/water interface, which can significantly reduce the dosage of the switchable surfactant compared with previous CO2/N2-responsive surfactants. The dynamic interfacial tension of n-decane and aqueous phase decreased from 45 mN m-1 to 5 mN m-1 within 100 s with the addition of 0.2 mM surfactant. In this work, a low concentration of the novel switchable surfactant (e.g., 20.0 mM) can realize reversible emulsification and demulsification in an emulsion system as compared with the high dosage (e.g., ~150 mM) in previous reports, which will bring huge economic benefits in industrial applications in the future. Moreover, this work expands the family of ion-pair surfactants to small amino-functionalized molecules beyond Jeffamine D-230, which promotes the development of simple and switchable ion-pair surfactant. It is found that the O/W emulsions stabilized by the switchable surfactant show excellent stability, which can be stored for over 60 days at room temperature without any obvious change. Interestingly, the stable O/W emulsion is completely demulsified upon bubbling CO2 for 30 s and can be easily re-emulsified to the initial state after purging N2 at 60 °C within 10 min, which demonstrates a rapid and highly efficient switching behavior. The reversible emulsification and demulsification process is ascribed to the reversible assembly and disassembly of the switchable surfactant, which is induced by the removal and purge of CO2.
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Li X, Wang B, Dai S, Lu H, Huang Z. Ionic Liquid-Based Microemulsions with Reversible Microstructures Regulated by CO 2. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:264-272. [PMID: 31845812 DOI: 10.1021/acs.langmuir.9b03327] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
CO2-responsive microemulsions based on ionic liquid 1,1,3,3-tetramethylguanidine-oleic acid (TMG-OA) have been designed to provide an approach for reducing the volatilization of amine in amine-containing microemulsions effectively and exhibit reversible transitions of microstructures. The ionic liquid TMG-OA was prepared by the direct neutralization of oleic acid (HOA) and 1,1,3,3-tetramethylguanidine (TMG, one of volatile and toxic amines). From the investigations of nuclear magnetic resonance hydrogen spectrum, pH, thermogravimetry, and automatic interface tension meter, the excellent properties of switchability, stability, and surface activity of TMG-OA were demonstrated, and then the ionic liquid-based microemulsions with CO2 response were prepared with TMG-OA (surfactant), HOA (oil phase), isopropyl alcohol (IPA, cosurfactant), and water. Interestingly, for microemulsions with a higher IPA content (47.42, 44.48 wt %), sizes of microemulsions are increased upon introducing CO2 and decreased upon addition of N2/65 °C. In addition, for microemulsions with a lower IPA content (26.22 wt %), the new microemulsions with different sizes are regenerated after the phase separation of emulsions generated by introducing CO2, and incomplete recovery of microemulsions can be observed upon addition of N2/65 °C. The reversible microstructures are induced by the swelling behavior and the reduced single phase area, which are caused by the reversible conversion between TMG-OA and HOA components.
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Affiliation(s)
- Xiaojiang Li
- College of Chemistry and Chemical Engineering , Southwest Petroleum University , Chengdu 610500 , P. R. China
| | - Baogang Wang
- 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
| | - 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
| | - 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
| | - 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 , Chengdu 610500 , P. R. China
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Dai S, Tao M, Lu H. CO2-switchable wormlike micelles based on a switchable ionic liquid and tetradecyl trimethyl ammonium bromide. J DISPER SCI TECHNOL 2019. [DOI: 10.1080/01932691.2019.1699430] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Shanshan Dai
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, P. R. China
- Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu, P. R. China
| | - Minmin Tao
- 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
- Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu, 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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Zhang Y, Chen X, Liu X. Temperature-Induced Reversible-Phase Transition in a Surfactant-Free Microemulsion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14358-14363. [PMID: 31600447 DOI: 10.1021/acs.langmuir.9b02842] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Microemulsion represents an important class of the colloidal system, though the development of stimuli-responsive microemulsion is still in its infancy. Here, we demonstrated the temperature responsiveness of a conventional surfactant-free microemulsion composed of n-octanol as nonpolar phase, ethanol as amphi-solvent, and water as polar phase for the first time. In the single-phase region of the phase diagram, the pre-ouzo zone was confirmed by dynamic light scattering (DLS), and the type of microemulsion was confirmed via the conductivity and polarity probe methods. The effects of temperature on the phase behavior and droplet size of the n-octanol-water-ethanol microemulsion system were systemically evaluated by the ternary phase diagram and DLS techniques. The results showed that the area of single-phase increases upon increasing temperature, but the area of pre-ouzo zone decreases accompanied by a decrease in the droplet size. Moreover, the critical point gradually draws close to the n-octanol corner with increasing temperature. When one formulation is far away from the demixing border, the droplet size can be reversibly and precisely regulated by changing temperature. When one formulation is located on the vicinity of the boundary, a minor variation in temperature can lead to a prominent phase transition between Winsor IV (high temperature) and Winsor II (low temperature). Such a temperature-responsive microemulsion can be used as a microreactor for Knoevenagel condensation. The reaction was carried out at 35 °C, and the product was collected from the water phase by simple filtration at 25 °C.
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Affiliation(s)
- Yongmin Zhang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Xuelian Chen
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Xuefeng Liu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical & Materials Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
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Wang Z, Ren G, Yang J, Xu Z, Sun D. CO 2-responsive aqueous foams stabilized by pseudogemini surfactants. J Colloid Interface Sci 2018; 536:381-388. [PMID: 30380437 DOI: 10.1016/j.jcis.2018.10.040] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 10/13/2018] [Accepted: 10/15/2018] [Indexed: 10/28/2022]
Abstract
HYPOTHESIS To obtain surfactants with superior surface activity and responsive behavior, "pseudogemini" surfactants (short for D-LCFA) are synthesized by mixing long chain fatty acids (LCFA) and polyetheramine D 230 at fixed molar ratio (2:1). Non-covalently bonded building blocks indicate that CO2-responsive aqueous foams can be obtained by utilizing such pseudogemini surfactants. EXPERIMENTS 1H NMR and FT-IR characterizations prove that the building blocks of these surfactants are associated by electrostatic interaction. The synthesis (Brønsted acid-base reaction) is simple and eco-friendly. "Pseudogemini" structure enables D-LCFA to reduce surface tension of aqueous solution effectively, thus facilitating foam generation. Rheograms, FF-TEM and Cryo-TEM results prove that different aggregates in D-LCFA aqueous solutions lead to different foam properties. FINDINGS Bubbling of CO2 for about 30 s leads to the rupture of aqueous foams generated by D-LCFA, while removing CO2 by bubbling of N2 at 65 °C for 10 min enables re-generation of foams. The CO2-responsive foaming properties can be attributed to dissociation of D-LCFA upon bubbling of CO2 and re-association upon removal of CO2. The effective CO2-responsive foams can be applied to many areas, such as foam fracturing, foam enhanced oil recovery or recovering of radioactive materials.
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Affiliation(s)
- Zengzi Wang
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, Shandong 250100, PR China
| | - Gaihuan Ren
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, Shandong 250100, PR China
| | - Jiawen Yang
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, Shandong 250100, PR China
| | - Zhenghe Xu
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, PR China; 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.
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