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Dib N, Falcone RD, Acuña A, García-Río L. Characterization of Reverse Micelles Formulated with the Ionic-Liquid-like Surfactant Bmim-AOT and Comparison with the Traditional Na-AOT: Dynamic Light Scattering, 1H NMR Spectroscopy, and Hydrolysis Reaction of Carbonate as a Probe. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:12744-12753. [PMID: 31495176 DOI: 10.1021/acs.langmuir.9b01083] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The present study investigated how the presence of butylmethylimidazolium cation (bmim+) alters the interfacial properties of reverse micelles (RMs) created with the ionic liquid-like surfactant 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (bmim-AOT), in comparison to sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) RMs, employing dynamic light scattering (DLS) and 1H NMR techniques. Moreover, through the hydrolysis reaction of bis(4-nitrophenyl)carbonate inside both RMs as reaction probe, interfacial properties changes were explored in more detail. The kinetic solvent isotope effect was also analyzed. Micellar systems were formed using n-heptane as external nonpolar solvent and water as the polar component. According to the DLS studies, water is encapsulated inside the organized media; however, a different tendency is observed depending on the cationic component of the surfactant. For Na-AOT system, the results suggest that the micellar shapes are probably spherical, while in the case of bmim-AOT, a transition from ellipsoidal to spherical micelles could be occurring when water is added. 1H NMR data show that water is structured differently when Na+ cation is replaced by bmim+; in bmim-AOT RMs, the interaction of water with the surfactant is weaker and the water hydrogen-bonding network is less disturbed than in Na-AOT RMs. Kinetic studies reveal that the hydrolysis reaction in bmim-AOT RMs was much more favorable in comparison to Na-AOT RMs. In addition, when water content decreases in bmim-AOT RMs, the hydrolysis reaction rate increases and the solvent isotope effect remains constant, while for Na-AOT solutions, both the reaction rate and the solvent isotope effect decrease. Our results indicate that bmim+ cation would be located in the surfactant layer in such a way the negative charge density in the interface is less than that in Na-AOT RMs, and the reaction is more favorable. Additionally, as 1H NMR studies reveal, the interfacial water molecules would be more available in bmim-AOT RMs to participate in the nucleophilic attack. Therefore, the present study evidences how the replacement of Na+ counterion by bmim+ alters the composition of the interface of AOT RMs.
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Affiliation(s)
- Nahir Dib
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-UNRC, Departamento de Química , Universidad Nacional de Río Cuarto , Agencia Postal # 3, CP X5804BYA Río Cuarto , Argentina
| | - R Dario Falcone
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-UNRC, Departamento de Química , Universidad Nacional de Río Cuarto , Agencia Postal # 3, CP X5804BYA Río Cuarto , Argentina
| | - Angel Acuña
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Física , Universidade de Santiago de Compostela , 15782 Santiago , Spain
| | - Luis García-Río
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Física , Universidade de Santiago de Compostela , 15782 Santiago , Spain
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Aramaki K, Ooishi K, Fujii M, Ariga K, Shrestha LK. Demonstration of a Novel Charge-Free Reverse Wormlike Micelle System. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8670-8677. [PMID: 29940738 DOI: 10.1021/acs.langmuir.8b01632] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We demonstrate a novel charge-free reverse wormlike micelle (RWLM) consisting of a ternary mixture of a nonionic amphiphilic block copolymer, fatty acid alkyl ester oil, and water under ambient conditions. Nonionic amphiphile tetra-[poly(oxyethylene)-poly(oxybutylene)]pentaerythrityl ether (TEBPE) self-assembled into spheroid-type micelles in nonaqueous media isopropyl myristate (IPM) with viscosity comparable to that of IPM. The addition of water increases viscosity only slightly up to a certain concentration of water and then drastically, demonstrating the sphere-to-wormlike micelle transition as confirmed by small-angle X-ray scattering. Further increase in water decreases the viscosity after attaining a maximum value. The zero shear viscosity (η0) of the 10 wt % TEBPE/IPM system reached the maximum at 2.6 wt % water and ca. 56 Pa·s, which is ∼fivefold higher than that of water. Dynamic rheological measurements on the highly viscous solutions confirmed the viscoelastic behavior and could be described by the Maxwell model. Conductivity, measured in the presence of a conductive probe, 1-ethyl-3-methylimidazolium tetrafluoroborate, was found to be higher for viscous samples compared to the nonviscous samples, suggesting the static percolation caused by the RWLM formation. Decrease in η0 and conductivity beyond a maximum suggests the shortening of reverse micelles. A similar behavior has been observed in other fatty acid alkyl ester oils of different alkyl chain lengths. Note that most of the RWLM systems previously reported are based on phosphatidylcholine (PC). Formulation and structure-properties related to non-PC-based RWLMs have been rarely explored. Non-PC-based RWLMs using chemically stable and low-cost synthetic molecules can be applied not only in pharmaceuticals and cosmetics but also in a wide range of applications including drag reduction agents for nonaqueous fluids and as a template for nanomaterial synthesis.
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Affiliation(s)
- Kenji Aramaki
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai 79-7 , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Kaoru Ooishi
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai 79-7 , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Misaki Fujii
- Graduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai 79-7 , Hodogaya-ku, Yokohama 240-8501 , Japan
| | - Katsuhiko Ariga
- International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
- Department of Advanced Materials Science, Graduate School of Frontier Sciences , The University of Tokyo , 5-1-5 Kashiwanoha , Kashiwa , Chiba 277-8561 , Japan
| | - Lok Kumar Shrestha
- International Center for Materials Nanoarchitectonics (WPI-MANA) , National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan
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Abbate S, Castiglione F, Lebon F, Longhi G, Longo A, Mele A, Panzeri W, Ruggirello A, Liveri VT. Spectroscopic and Structural Investigation of the Confinement of d and l Dimethyl Tartrate in Lecithin Reverse Micelles. J Phys Chem B 2009; 113:3024-33. [DOI: 10.1021/jp809793u] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sergio Abbate
- Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Viale Europa 11, 25123, Brescia, Italy, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Via della Vasca Navale, 84 - 00146 Roma, Italy, Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze, Parco d‘Orleans II, 90128, Palermo, Italy, Dipartimento di Chimica, Materiali e Ing. Chimica, “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7 - 20131 Milano, Italy, ISMN,
| | - Franca Castiglione
- Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Viale Europa 11, 25123, Brescia, Italy, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Via della Vasca Navale, 84 - 00146 Roma, Italy, Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze, Parco d‘Orleans II, 90128, Palermo, Italy, Dipartimento di Chimica, Materiali e Ing. Chimica, “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7 - 20131 Milano, Italy, ISMN,
| | - France Lebon
- Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Viale Europa 11, 25123, Brescia, Italy, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Via della Vasca Navale, 84 - 00146 Roma, Italy, Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze, Parco d‘Orleans II, 90128, Palermo, Italy, Dipartimento di Chimica, Materiali e Ing. Chimica, “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7 - 20131 Milano, Italy, ISMN,
| | - Giovanna Longhi
- Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Viale Europa 11, 25123, Brescia, Italy, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Via della Vasca Navale, 84 - 00146 Roma, Italy, Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze, Parco d‘Orleans II, 90128, Palermo, Italy, Dipartimento di Chimica, Materiali e Ing. Chimica, “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7 - 20131 Milano, Italy, ISMN,
| | - Alessandro Longo
- Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Viale Europa 11, 25123, Brescia, Italy, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Via della Vasca Navale, 84 - 00146 Roma, Italy, Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze, Parco d‘Orleans II, 90128, Palermo, Italy, Dipartimento di Chimica, Materiali e Ing. Chimica, “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7 - 20131 Milano, Italy, ISMN,
| | - Andrea Mele
- Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Viale Europa 11, 25123, Brescia, Italy, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Via della Vasca Navale, 84 - 00146 Roma, Italy, Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze, Parco d‘Orleans II, 90128, Palermo, Italy, Dipartimento di Chimica, Materiali e Ing. Chimica, “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7 - 20131 Milano, Italy, ISMN,
| | - Walter Panzeri
- Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Viale Europa 11, 25123, Brescia, Italy, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Via della Vasca Navale, 84 - 00146 Roma, Italy, Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze, Parco d‘Orleans II, 90128, Palermo, Italy, Dipartimento di Chimica, Materiali e Ing. Chimica, “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7 - 20131 Milano, Italy, ISMN,
| | - Angela Ruggirello
- Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Viale Europa 11, 25123, Brescia, Italy, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Via della Vasca Navale, 84 - 00146 Roma, Italy, Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze, Parco d‘Orleans II, 90128, Palermo, Italy, Dipartimento di Chimica, Materiali e Ing. Chimica, “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7 - 20131 Milano, Italy, ISMN,
| | - Vincenzo Turco Liveri
- Dipartimento di Scienze Biomediche e Biotecnologie, Università di Brescia, Viale Europa 11, 25123, Brescia, Italy, Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM), Via della Vasca Navale, 84 - 00146 Roma, Italy, Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze, Parco d‘Orleans II, 90128, Palermo, Italy, Dipartimento di Chimica, Materiali e Ing. Chimica, “Giulio Natta” Politecnico di Milano, Via L. Mancinelli, 7 - 20131 Milano, Italy, ISMN,
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