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A guide to designing graphene-philic surfactants. J Colloid Interface Sci 2022; 620:346-355. [DOI: 10.1016/j.jcis.2022.03.145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 03/30/2022] [Accepted: 03/31/2022] [Indexed: 11/22/2022]
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2
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Ren HR, Xu QQ, Yin JZ. Microscopic properties and stabilization mechanism of a supercritical carbon dioxide microemulsion with extremely high water content. J Colloid Interface Sci 2021; 607:1953-1962. [PMID: 34695744 DOI: 10.1016/j.jcis.2021.09.188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/28/2021] [Accepted: 09/29/2021] [Indexed: 11/17/2022]
Abstract
HYPOTHESIS Developing the supercritical carbon dioxide microemulsion with a broad water content (W0) window can provide more possibility for designing highly efficient chemical processes, which is challenging due to the lack of comprehension about its formation mechanism. Molecular dynamics simulation method is expected to reveal the microscopic stabilization mechanism of high-W0 microemulsions. SIMULATIONS All-atom molecular dynamics simulations of the ternary systems with varied W0 stabilized by 4FG(EO)2 surfactant were designed according to phase behavior experiments. A systematic investigation was performed concerning the self-assembling, equilibrium morphology and detailed microstructure of the microemulsion droplet. An in-depth comparative study about the distribution of both H2O and CO2, the interfacial behaviors of 4FG(EO)2, as well as the microscopic interactions was conducted. FINDINGS For the first time, direct evidence was provided for the formation of water-in-carbon dioxide microemulsion with extremely high W0 (80) under the effect of 4FG(EO)2. Furthermore, a unique interfacial phenomenon, i. e. CO2 accumulating at the interface, was revealed to be responsible for the formation and enhanced stability of the nanosized droplet with high W0. This should set a new guiding star for synthesizing and selecting effective interfacial modifiers to create high-W0 microemulsions.
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Affiliation(s)
- Hong-Rui Ren
- State Key Laboratory of Fine Chemical, School of Chemical Machinery, Dalian University of Technology, Dalian 116024, China
| | - Qin-Qin Xu
- State Key Laboratory of Fine Chemical, School of Chemical Machinery, Dalian University of Technology, Dalian 116024, China
| | - Jian-Zhong Yin
- State Key Laboratory of Fine Chemical, School of Chemical Machinery, Dalian University of Technology, Dalian 116024, China.
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Zhou R, Jin Y, Shen Y, Lai S, Zhou Y, Zhao P. Surface activity, salt and pH tolerance, and wettability of novel nonionic fluorinated surfactants with a short fluorocarbon chain. J DISPER SCI TECHNOL 2020. [DOI: 10.1080/01932691.2020.1768862] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Rong Zhou
- Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education , Chengdu , China
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University , Chengdu , China
| | - Yong Jin
- Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education , Chengdu , China
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University , Chengdu , China
| | - Yichao Shen
- Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education , Chengdu , China
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University , Chengdu , China
| | - Shuangquan Lai
- Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education , Chengdu , China
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University , Chengdu , China
| | - Yutang Zhou
- Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education , Chengdu , China
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University , Chengdu , China
| | - Peng Zhao
- Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education , Chengdu , China
- National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University , Chengdu , China
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4
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The self-assembly and microscopic interfacial properties of a supercritical CO2 microemulsion having hydrotropes: Atom-level observation from molecular dynamics simulation. J CO2 UTIL 2020. [DOI: 10.1016/j.jcou.2020.01.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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5
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Cui J, Sandahl M, Wendt OF, Rodriguez‐Meizoso I. Extraction with Water‐in‐Carbon Dioxide Microemulsions: A Case Study on Steviol Glycosides. J SURFACTANTS DETERG 2019. [DOI: 10.1002/jsde.12325] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jingwen Cui
- Centre for Analysis and Synthesis, Department of ChemistryLund University P.O. Box 124, SE‐22100 Lund Sweden
| | - Margareta Sandahl
- Centre for Analysis and Synthesis, Department of ChemistryLund University P.O. Box 124, SE‐22100 Lund Sweden
| | - Ola F. Wendt
- Centre for Analysis and Synthesis, Department of ChemistryLund University P.O. Box 124, SE‐22100 Lund Sweden
| | - Irene Rodriguez‐Meizoso
- Centre for Analysis and Synthesis, Department of ChemistryLund University P.O. Box 124, SE‐22100 Lund Sweden
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6
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Stabilization of 4FS(EO)2 constructed water-in-carbon dioxide microemulsions (W/C μEs) with nonfluorinated co-surfactants. J Supercrit Fluids 2019. [DOI: 10.1016/j.supflu.2019.03.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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7
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Surfactants with aromatic headgroups for optimizing properties of graphene/natural rubber latex composites (NRL): Surfactants with aromatic amine polar heads. J Colloid Interface Sci 2019; 545:184-194. [PMID: 30878784 DOI: 10.1016/j.jcis.2019.03.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 11/20/2022]
Abstract
HYPOTHESIS The compatibility of surfactants and graphene surfaces can be improved by increasing the number of aromatic groups in the surfactants. Including aniline in the structure may improve the compatibility between surfactant and graphene further still. Surfactants can be modified by incorporating aromatic groups in the hydrophobic chains or hydrophilic headgroups. Therefore, it is of interest to investigate the effects of employing anilinium based surfactants to disperse graphene nanoplatelets (GNPs) in natural rubber latex (NRL) for the fabrication of electrically conductive nanocomposites. EXPERIMENTS New graphene-philic surfactants carrying aromatic moieties in the hydrophilic headgroups and hydrophobic tails were synthesized by swapping the traditional sodium counterion with anilinium. 1H NMR spectroscopy was used to characterize the surfactants. These custom-made surfactants were used to assist the dispersion of GNPs in natural rubber latex matrices for the preparation of conductive nanocomposites. The properties of nanocomposites with the new anilinium surfactants were compared with commercial sodium surfactant sodium dodecylsulfate (SDS), sodium dodecylbenzenesulfonate (SDBS), and the previously synthesized aromatic tri-chain sodium surfactant TC3Ph3 (sodium 1,5-dioxo-1,5-bis(3-phenylpropoxy)-3-((3phenylpropoxy)carbonyl) pentane-2-sulfonate). Structural properties of the nanocomposites were studied using Raman spectroscopy, field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). Electrical conductivity measurements and Zeta potential measurements were used to assess the relationships between total number of aromatic groups in the surfactant molecular structure and nanocomposite properties. The self-assembly structure of surfactants in aqueous systems and GNP dispersions was assessed using small-angle neutron scattering (SANS). FINDINGS Among these different surfactants, the anilinium version of TC3Ph3 namely TC3Ph3-AN (anilinium 1,5-dioxo-1,5-bis(3-phenylpropoxy)-3-((3phenylpropoxy)carbonyl) pentane-2-sulfonate) was shown to be highly efficient for dispersing GNPs in the NRL matrices, increasing electrical conductivity eleven orders of magnitude higher than the neat rubber latex. Comparisons between the sodium and anilinium surfactants show significant differences in the final properties of the nanocomposites. In general, the strategy of increasing the number of surfactant-borne aromatic groups by incorporating anilinium ions in surfactant headgroups appears to be effective.
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Wang M, Fang T, Zhong H, Li J, Yan Y, Zhang J. Optimal aggregation number of reverse micelles in supercritical carbon dioxide: a theoretical perspective. SOFT MATTER 2019; 15:3323-3329. [PMID: 30924475 DOI: 10.1039/c8sm02299b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The aggregation number is one of the most fundamental and important structural parameters for the micelle or reverse micelle (RM) system. In this work, a simple, reliable method for the determination of the aggregation number of RMs in supercritical CO2 (scCO2) was presented through a molecular dynamics simulation. The process of pulling surfactants out of the RMs one by one was performed to calculate the aggregation number. The free energies of RMs with different numbers of surfactants were calculated through this process. We found an RM with the lowest free energy, which was considered to have the optimal number of surfactants. Therefore, the optimal aggregation number of RMs was acquired. In order to explain the existence of an optimal aggregation number, detailed analyses of surfactant accumulation were conducted by combining molecular dynamics with quantum chemistry methods. The results indicated that in the RMs with the lowest free energy, the head-group and tail-terminal of the surfactants accumulated on an equipotential surface. In this case, the surfactant film could effectively separate water and CO2; thus, the lowest free energy was expected. This method determined the aggregation number of RMs by theoretical calculations that did not depend on experimental measurements. This presented approach facilitates the evaluation of the characteristics of RMs in scCO2 and can be further applied in the RM system of organic solvents or even in the micellar system.
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Affiliation(s)
- Muhan Wang
- School of Materials Science and Engineering, China University of Petroleum, 266580 Qingdao, Shandong, China.
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9
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Sagisaka M, Ono S, James C, Yoshizawa A, Mohamed A, Guittard F, Enick RM, Rogers SE, Czajka A, Hill C, Eastoe J. Anisotropic reversed micelles with fluorocarbon-hydrocarbon hybrid surfactants in supercritical CO 2. Colloids Surf B Biointerfaces 2018; 168:201-210. [PMID: 29276082 DOI: 10.1016/j.colsurfb.2017.12.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Revised: 11/28/2017] [Accepted: 12/09/2017] [Indexed: 11/19/2022]
Abstract
Previous work (M. Sagisaka, et al. Langmuir 31 (2015) 7479-7487), showed the most effective fluorocarbon (FC) and hydrocarbon (HC) chain lengths in the hybrid surfactants FCm-HCn (sodium 1-oxo-1-[4-(perfluoroalkyl)phenyl]alkane-2-sulfonates, where m = FC length and n = HC length) were m and n = 6 and 4 for water solubilization, whereas m 6 and n 6, or m 6 and n 5, were optimal chain lengths for reversed micelle elongation in supercritical CO2. To clarify why this difference of only a few methylene chain units is so effective at tuning the solubilizing power and reversed micelle morphology, nanostructures of water-in-CO2 (W/CO2) microemulsions were investigated by high-pressure small-angle neutron scattering (SANS) measurements at different water-to-surfactant molar ratios (W0) and surfactant concentrations. By modelling SANS profiles with cylindrical and ellipsoidal form factors, the FC6-HCn/W/CO2 microemulsions were found to increase in size with increasing W0 and surfactant concentration. Ellipsoidal cross-sectional radii of the FC6-HC4/W/CO2 microemulsion droplets increased linearly with W0, and finally reached ∼39 Å and ∼78 Å at W0 = 85 (close to the upper limit of solubilizing power). These systems appear to be the largest W/CO2 microemulsion droplets ever reported. The aqueous domains of FC6-HC6 rod-like reversed micelles increased in size by 3.5 times on increasing surfactant concentration from 35 mM to 50 mM: at 35 mM, FC6-HC5 formed rod-like reversed micelles 5.3 times larger than FC6-HC6. Interestingly, these results suggest that hybrid HC-chains partition into the microemulsion aqueous cores with the sulfonate headgroups, or at the W/CO2 interfaces, and so play important roles for tuning the W/CO2 interfacial curvature. The super-efficient W/CO2-type solubilizer FC6-HC4, and the rod-like reversed micelle forming surfactant FC6-HC5, represent the most successful cases of low fluorine content additives. These surfactants facilitate VOC-free, effective and energy-saving CO2 solvent systems for applications such as extraction, dyeing, dry cleaning, metal-plating, enhanced oil recovery and organic/inorganic or nanomaterial synthesis.
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Affiliation(s)
- Masanobu Sagisaka
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan.
| | - Shinji Ono
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Craig James
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Atsushi Yoshizawa
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Azmi Mohamed
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia; Nanotechnology Research Centre, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia
| | | | - Robert M Enick
- Department of Chemical and Petroleum Engineering, University of Pittsburgh, 940 Benedum Hall, 3700 O'Hara Street, Pittsburgh, PA 15261, United States
| | - Sarah E Rogers
- ISIS-CCLRC, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, UK
| | - Adam Czajka
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Christopher Hill
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK
| | - Julian Eastoe
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
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10
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Mohamed A, Ardyani T, Bakar SA, Sagisaka M, Ono S, Narumi T, Kubota M, Brown P, Eastoe J. Effect of surfactant headgroup on low-fluorine-content CO2-philic hybrid surfactants. J Supercrit Fluids 2016. [DOI: 10.1016/j.supflu.2016.04.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Phase behavior and interfacial properties of a switchable ethoxylated amine surfactant at high temperature and effects on CO2-in-water foams. J Colloid Interface Sci 2016; 470:80-91. [DOI: 10.1016/j.jcis.2016.02.028] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 02/07/2016] [Accepted: 02/08/2016] [Indexed: 11/18/2022]
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12
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Zemb T, Kunz W. Weak aggregation: State of the art, expectations and open questions. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.04.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Girard E, Tassaing T, Marty JD, Destarac M. Structure-Property Relationships in CO2-philic (Co)polymers: Phase Behavior, Self-Assembly, and Stabilization of Water/CO2 Emulsions. Chem Rev 2016; 116:4125-69. [PMID: 27014998 DOI: 10.1021/acs.chemrev.5b00420] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This Review provides comprehensive guidelines for the design of CO2-philic copolymers through an exhaustive and precise coverage of factors governing the solubility of different classes of polymers. Starting from computational calculations describing the interactions of CO2 with various functionalities, we describe the phase behavior in sc-CO2 of the main families of polymers reported in literature. The self-assembly of amphiphilic copolymers of controlled architecture in supercritical carbon dioxide and their use as stabilizers for water/carbon dioxide emulsions then are covered. The relationships between the structure of such materials and their behavior in solutions and at interfaces are systematically underlined throughout these sections.
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Affiliation(s)
- Etienne Girard
- IMRCP, UMR CNRS 5623, Université de Toulouse , 118, route de Narbonne, Toulouse F-31062 Cedex 9, France
| | - Thierry Tassaing
- ISM, UMR CNRS 5255, Université de Bordeaux , 351, Cours de la Libération, Talence F-33405 Cedex, France
| | - Jean-Daniel Marty
- IMRCP, UMR CNRS 5623, Université de Toulouse , 118, route de Narbonne, Toulouse F-31062 Cedex 9, France
| | - Mathias Destarac
- IMRCP, UMR CNRS 5623, Université de Toulouse , 118, route de Narbonne, Toulouse F-31062 Cedex 9, France
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14
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Yan C, Sagisaka M, Rogers SE, Hazell G, Peach J, Eastoe J. Shape Modification of Water-in-CO2 Microemulsion Droplets through Mixing of Hydrocarbon and Fluorocarbon Amphiphiles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1421-1428. [PMID: 26807476 DOI: 10.1021/acs.langmuir.5b03630] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
An oxygen-rich hydrocarbon (HC) amphiphile has been developed as an additive for supercritical CO2 (scCO2). The effects of this custom-designed amphiphile have been studied in water-in-CO2 (w/c) microemulsions stabilized by analogous fluorocarbon (FC) surfactants, nFG(EO)2, which are known to form spherical w/c microemulsion droplets. By applying contrast-variation small-angle neutron scattering (CV-SANS), evidence has been obtained for anisotropic structures in the mixed systems. The shape transition is attributed to the hydrocarbon additive, which modifies the curvature of the mixed surfactant films. This can be considered as a potential method to enhance physicochemical properties of scCO2 through elongation of w/c microemulsion droplets. More importantly, by studying self-assembly in these mixed systems, fundamental understanding can be developed on the packing of HC and FC amphiphiles at water/CO2 interfaces. This provides guidelines for the design of fluorine-free CO2 active surfactants, and therefore, practical industrial scale applications of scCO2 could be achieved.
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Affiliation(s)
- Ci Yan
- School of Chemistry, University of Bristol , Bristol BS8 1TS, United Kingdom
| | - Masanobu Sagisaka
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University , Bunkyo-cho 3, Hirosaki, Aomori 036-8561, Japan
| | - Sarah E Rogers
- Rutherford Appleton Laboratory, ISIS Facility, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - Gavin Hazell
- School of Chemistry, University of Bristol , Bristol BS8 1TS, United Kingdom
| | - Jocelyn Peach
- School of Chemistry, University of Bristol , Bristol BS8 1TS, United Kingdom
| | - Julian Eastoe
- School of Chemistry, University of Bristol , Bristol BS8 1TS, United Kingdom
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15
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High-efficiency exfoliation of layered materials into 2D nanosheets in switchable CO2/Surfactant/H2O system. Sci Rep 2015; 5:16764. [PMID: 26568039 PMCID: PMC4645177 DOI: 10.1038/srep16764] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Accepted: 10/20/2015] [Indexed: 11/08/2022] Open
Abstract
Layered materials present attractive and important properties due to their two-dimensional (2D) structure, allowing potential applications including electronics, optoelectronics, and catalysis. However, fully exploiting the outstanding properties will require a method for their efficient exfoliation. Here we present that a series of layered materials can be successfully exfoliated into single- and few-layer nanosheets using the driving forces coming from the phase inversion, i.e., from micelles to reverse micelles in the emulsion microenvironment built by supercritical carbon dioxide (SC CO2). The effect of variable experimental parameters including CO2 pressure, ethanol/water ratio, and initial concentration of bulk materials on the exfoliation yield have been investigated. Moreover, we demonstrate that the exfoliated 2D nanosheets have their worthwhile applications, for example, graphene can be used to prepare conductive paper, MoS2 can be used as fluorescent label to perform cellular labelling, and BN can effectively reinforce polymers leading to the promising mechanical properties.
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16
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17
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Economical and Efficient Hybrid Surfactant with Low Fluorine Content for the Stabilisation of Water-in-CO2 Microemulsions. J Supercrit Fluids 2015. [DOI: 10.1016/j.supflu.2015.01.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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18
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Pütz Y, Grassberger L, Lindner P, Schweins R, Strey R, Sottmann T. Unexpected efficiency boosting in CO2-microemulsions: a cyclohexane depletion zone near the fluorinated surfactants evidenced by a systematic SANS contrast variation study. Phys Chem Chem Phys 2015; 17:6122-34. [DOI: 10.1039/c4cp05435k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Concentration gradient of cyclohexane in a CO2/cyclohexane swollen micelle stabilized by fluorinated surfactants revealed by the GIFT analysis of a SANS contrast variation.
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Affiliation(s)
- Y. Pütz
- Department of Chemistry
- University of Cologne
- D-50939 Cologne
- Germany
| | - L. Grassberger
- Department of Chemistry
- University of Cologne
- D-50939 Cologne
- Germany
| | - P. Lindner
- Institut Laue-Langevin
- LSS Group
- F-38000 Grenoble
- France
| | - R. Schweins
- Institut Laue-Langevin
- LSS Group
- F-38000 Grenoble
- France
| | - R. Strey
- Department of Chemistry
- University of Cologne
- D-50939 Cologne
- Germany
| | - T. Sottmann
- Institute of Physical Chemistry
- University of Stuttgart
- D-70569 Stuttgart
- Germany
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19
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Boyère C, Jérôme C, Debuigne A. Input of supercritical carbon dioxide to polymer synthesis: An overview. Eur Polym J 2014. [DOI: 10.1016/j.eurpolymj.2014.07.019] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Properties of surfactant films in water-in-CO2 microemulsions obtained by small-angle neutron scattering. J Colloid Interface Sci 2014; 435:112-8. [DOI: 10.1016/j.jcis.2014.08.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 08/20/2014] [Accepted: 08/21/2014] [Indexed: 11/21/2022]
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21
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Ye N, Zhang X, Shang W. High Pressure CO2-Controlled Reactor: Suzuki Reaction in CO2-Based Micelle Stabilized by Nonionic Methylated Branched Hydrocarbon Surfactants. Ind Eng Chem Res 2014. [DOI: 10.1021/ie501444j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Nannan Ye
- Department of Chemistry, Renmin University of China, Beijing 100872, P.R. China
| | - Xiaogang Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, P.R. China
| | - Wenting Shang
- Department of Chemistry, Renmin University of China, Beijing 100872, P.R. China
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22
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Sagir M, Tan IM, Mushtaq M, Ismail L, Nadeem M, Azam MR. Synthesis of a New CO2Philic Surfactant for Enhanced Oil Recovery Applications. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2013.803253] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Zhang S, Chen K, Liang L, Tan B. Synthesis of oligomer vinyl acetate with different topologies by RAFT/MADIX method and their phase behaviour in supercritical carbon dioxide. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.07.045] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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24
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Santiso EE, Musolino N, Trout BL. Design of linear ligands for selective separation using a genetic algorithm applied to molecular architecture. J Chem Inf Model 2013; 53:1638-60. [PMID: 23844994 DOI: 10.1021/ci400043q] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Continuous purification of chemical reaction products through adsorption-based operations during workup may present advantages over batch chromatography or crystallization. In pharmaceutical syntheses, however, the desired product is often structurally similar to byproducts or unconverted reactant, so that identifying a suitable adsorption medium is challenging. We developed an in silico screening process to design organic ligands which, when chemically bound to a solid surface, would constitute an effective adsorption for a pharmaceutically relevant mixture of reaction products. This procedure employs automated molecular dynamics simulations to evaluate potential ligands, by measuring the difference in adsorption energy of two solutes which differed by one functional group. Then, a genetic algorithm was used to iteratively improve a population of such ligands through selection and reproduction steps. This procedure identified chemical designs of the surface-bound ligands that were outside the set we considered using chemical intuition. The ligand designs achieved selectivity by exploiting phenyl-phenyl stacking which was sterically hindered in the case of one solution component. The ligand designs had selectivity energies of 0.8-1.6 kcal/mol in single-ligand, solvent-free simulations, if entropic contributions to the relative selectivity are neglected. We believe this molecular evolution technique presents a useful method for the directed exploration of chemical space or for molecular design, when the chemical properties of interest can be efficiently evaluated through simulations.
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Affiliation(s)
- Erik E Santiso
- Department of Chemical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02144, USA
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Sagisaka M, Iwama S, Ono S, Yoshizawa A, Mohamed A, Cummings S, Yan C, James C, Rogers SE, Heenan RK, Eastoe J. Nanostructures in water-in-CO2 microemulsions stabilized by double-chain fluorocarbon solubilizers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:7618-7628. [PMID: 23701401 DOI: 10.1021/la400376g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
High-pressure small-angle neutron scattering (HP-SANS) studies were conducted to investigate nanostructures and interfacial properties of water-in-supercritical CO2 (W/CO2) microemulsions with double-fluorocarbon-tail anionic surfactants, having different fluorocarbon chain lengths and linking groups (glutarate or succinate). At constant pressure and temperature, the microemulsion aqueous cores were found to swell with an increase in water-to-surfactant ratio, W0, until their solubilizing capacities were reached. Surfactants with fluorocarbon chain lengths of n = 4, 6, and 8 formed spherical reversed micelles in supercritical CO2 even at W0 over the solubilizing powers as determined by phase behavior studies, suggesting formation of Winsor-IV W/CO2 microemulsions and then Winsor-II W/CO2 microemulsions. On the other hand, a short C2 chain fluorocarbon surfactant analogue displayed a transition from Winsor-IV microemulsions to lamellar liquid crystals at W0 = 25. Critical packing parameters and aggregation numbers were calculated by using area per headgroup, shell thickness, the core/shell radii determined from SANS data analysis: these parameters were used to help understand differences in aggregation behavior and solubilizing power in CO2. Increasing the microemulsion water loading led the critical packing parameter to decrease to ~1.3 and the aggregation number to increase to >90. Although these parameters were comparable between glutarate and succinate surfactants with the same fluorocarbon chain, decreasing the fluorocarbon chain length n reduced the critical packing parameter. At the same time, reducing chain length to 2 reduced negative interfacial curvature, favoring planar structures, as demonstrated by generation of lamellar liquid crystal phases.
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Affiliation(s)
- Masanobu Sagisaka
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8561, Japan.
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Yu W, Zhou D, Yin JZ, Gao JJ. Selective solubilization of 1,3-propanediol using a water–supercritical CO2 microemulsion with Ls-45 as surfactant. RSC Adv 2013. [DOI: 10.1039/c3ra23429k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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Thanthiriwatte KS, Duke JR, Jackson VE, Felmy AR, Dixon DA. High-Level Ab Initio Predictions of the Energetics of mCO2·(H2O)n (n = 1–3, m = 1–12) Clusters. J Phys Chem A 2012; 116:9718-29. [DOI: 10.1021/jp306594h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Sahan Thanthiriwatte
- Department of Chemistry, The University of Alabama, Shelby Hall, Box 870336,
Tuscaloosa, Alabama 35487-0336, United States
| | - Jessica R. Duke
- Department of Chemistry, The University of Alabama, Shelby Hall, Box 870336,
Tuscaloosa, Alabama 35487-0336, United States
| | - Virgil E. Jackson
- Department of Chemistry, The University of Alabama, Shelby Hall, Box 870336,
Tuscaloosa, Alabama 35487-0336, United States
| | - Andrew R. Felmy
- Fundamental and Computational
Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - David A. Dixon
- Department of Chemistry, The University of Alabama, Shelby Hall, Box 870336,
Tuscaloosa, Alabama 35487-0336, United States
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Sagisaka M, Iwama S, Yoshizawa A, Mohamed A, Cummings S, Eastoe J. Effective and efficient surfactant for CO2 having only short fluorocarbon chains. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:10988-10996. [PMID: 22738302 DOI: 10.1021/la301305q] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A previous study (Langmuir2011, 27, 5772) found the fluorinated double-tail sulfogulutarate 8FG(EO)(2) to act as a superefficient solubilizer for water in supercritical CO(2) (W/CO(2)) microemulsions. To explore more economic CO(2)-philic surfactants with high solubilizing power as well as rapid solubilization rates, the effects of fluorocarbon chain length and linking group were examined with sodium 1,5-bis(1H,1H,2H,2H-perfluoroalkyloxy)-1,5-dioxopentane-2-sulfonates (nFG(EO)(2), fluorocarbon chain length n = 4, 6, 8) and sodium 1,4-bis(1H,1H,2H,2H-perfluoroalkyloxy)-1,4-dioxobutane-2-sulfonate (nFS(EO)(2), n = 4, 8). Visual observation and UV-vis spectral measurements with methyl orange as a reporter dye indicated a maximum water-to-surfactant molar ratio (W(0)) in the microemulsions, which was 60-80 for nFG(EO)(2) and 40-50 for nFG(EO)(2). Although it is normally expected that high solubilizing power requires long fluorocarbon surfactant chains, the shortest fluorocarbon 4FG(EO)(2) interestingly achieved the highest W(0) (80) transparent single-phase W/CO(2) microemulsion. In addition, a very rapid solubilization of loaded water into CO(2) was observed for 4FG(EO)(2) even at a high W(0) of ~80.
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Affiliation(s)
- Masanobu Sagisaka
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori, Japan.
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Wu FG, Wang NN, Zhang QG, Sun SF, Yu ZW. Crystallization from the micellar phase of imidazolium-based cationic surfactants. J Colloid Interface Sci 2012; 374:197-205. [DOI: 10.1016/j.jcis.2012.01.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Revised: 01/25/2012] [Accepted: 01/25/2012] [Indexed: 11/24/2022]
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Mohamed A, Sagisaka M, Hollamby M, Rogers SE, Heenan RK, Dyer R, Eastoe J. Hybrid CO2-philic surfactants with low fluorine content. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6299-6306. [PMID: 22455477 DOI: 10.1021/la3005322] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The relationships between molecular architecture, aggregation, and interfacial activity of a new class of CO(2)-philic hybrid surfactants are investigated. The new hybrid surfactant CF2/AOT4 [sodium (4H,4H,5H,5H,5H-pentafluoropentyl-3,5,5-trimethyl-1-hexyl)-2-sulfosuccinate] was synthesized, having one hydrocarbon chain and one separate fluorocarbon chain. This hybrid H-F chain structure strikes a fine balance of properties, on one hand minimizing the fluorine content, while on the other maintaining a sufficient level of CO(2)-philicity. The surfactant has been investigated by a range of techniques including high-pressure phase behavior, UV-visible spectroscopy, small-angle neutron scattering (SANS), and air-water (a/w) surface tension measurements. The results advance the understanding of structure-function relationships for generating CO(2)-philic surfactants and are therefore beneficial for expanding applications of CO(2) to realize its potential using the most economic and efficient surfactants.
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Affiliation(s)
- Azmi Mohamed
- School of ChemistryUniversity of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
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Morales J, Manso JA, Cid A, Lodeiro C, Mejuto JC. Degradation of carbofuran derivatives in restricted water environments: basic hydrolysis in AOT-based microemulsions. J Colloid Interface Sci 2012; 372:113-20. [PMID: 22325067 DOI: 10.1016/j.jcis.2012.01.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 01/11/2012] [Accepted: 01/12/2012] [Indexed: 12/19/2022]
Abstract
The effect of sodium bis(2-ethylhexyl)sulfosuccinate/isooctane/water microemulsions on the stability of 2,2-dimethyl-2,3-dihydro-1-benzofuran-7-yl methylcarbamate (carbofuran, CF), 3-hydroxy-2,3-dihydro-2,2-dimethylbenzofuran-7-yl methylcarbamate (3-hydroxycarbofuran, HCF) and 3-keto-2,3-dihydro-2,2-dimethylbenzofuran-7-yl methylcarbamate (3-ketocarbofuran, KCF) in basic media has been studied. The presence of these microheterogeneous media implies a large basic hydrolysis of CF and HCF on increasing surfactant concentration and, also, on increasing water content in the microemulsion. The hydrolysis rate constants are approximately 2- and 10-fold higher than those in pure water for HCF and CF, respectively. In contrast, a steep descent in the rate of decomposition for KCF was observed. These behaviours can be ascribed to the presence of CF derivatives both in the hydrophilic phase and in the lipophilic phase, while the hydroxyl ions are only restricted to the water pool of the microemulsion (hydrophilic phase). The kinetic rate constants for the basic hydrolysis in AOT-based microemulsions have been obtained on the basis of a pseudophase model. Taking into account that an important part of soils are colloids, the possibility of the presence of restricted water environments implies that soil composition and its structure will play an important role in the stability of these carbamates. In fact, we observed that the presence of these restricted aqueous media in the environment, in particular in watersheds and in wastewaters, could reduce significantly the half-life of these pesticides (33% and 91% for HCF and CF, respectively).
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Affiliation(s)
- Jorge Morales
- Department of Physical Chemistry, Faculty of Sciences, University of Vigo, 32004 Ourense, Spain
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Carbon Dioxide in Ionic Liquid Microemulsions. Angew Chem Int Ed Engl 2011; 50:9911-5. [DOI: 10.1002/anie.201103956] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Indexed: 12/15/2022]
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Zhang J, Han B, Li J, Zhao Y, Yang G. Carbon Dioxide in Ionic Liquid Microemulsions. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201103956] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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