1
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Torquato LM, Tyagi G, Sharratt WN, Ahmad Z, Mahmoudi N, Gummel J, Robles ESJ, Cabral JT. Concentration Dependent Asymmetric Synergy in SDS-DDAO Mixed Surfactant Micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7433-7443. [PMID: 38532537 PMCID: PMC11008254 DOI: 10.1021/acs.langmuir.3c03900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/04/2024] [Accepted: 03/11/2024] [Indexed: 03/28/2024]
Abstract
We investigate the structure and interactions of a model anionic/amphoteric mixed surfactant micellar system, namely, sodium dodecyl sulfate (SDS) and N,N-dimethyldodecylamine N-oxide (DDAO), employing SANS, FTIR, DLS, and pH measurements, in the range 0.1-100 mM total surfactant concentration and 0-100% DDAO. Increasing surfactant concentration is found to elongate the prolate ellipsoid micelles (RPolar ∼ 25-40 Å), accompanied by up to a 6-fold increase in micellar charge. The surfactant synergy, in terms of micellar charge and size, diffusion coefficient, solution pH, and headgroup interactions, was found to vary with concentration. At lower concentrations (≤50 mM), the SDS-DDAO ratio of maximum synergy is found to be asymmetric (at 65-85% DDAO), which is rationalized using regular solution theory, suggesting an equilibrium between Na+ dissociation, DDAO protonation, and counterion concentration. At higher concentrations, maximum synergy shifts toward the equimolar ratio. Overall, our study expands and unifies previous reports, providing a comprehensive understanding for this model, synergetic mixed micellar system.
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Affiliation(s)
- Luis M.
G. Torquato
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - Gunjan Tyagi
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - William N. Sharratt
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - Zain Ahmad
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - Najet Mahmoudi
- ISIS
Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Jérémie Gummel
- Procter
& Gamble, Brussels Innovation Centre, Temselaan 100, 1853 Strombeek-Bever, Belgium
| | - Eric S. J. Robles
- Procter
& Gamble, Newcastle Innovation Centre, Newcastle upon Tyne NE12
9TS, United Kingdom
| | - João T. Cabral
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, U.K.
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2
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Matsuoka K, Sekiguchi R, Yoshimura T. Micelle formation of sodium taurolithocholate. Chem Phys Lipids 2024; 259:105378. [PMID: 38325711 DOI: 10.1016/j.chemphyslip.2024.105378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 01/27/2024] [Accepted: 02/02/2024] [Indexed: 02/09/2024]
Abstract
The proportion of sodium taurolithocholate (NaTLC) is extremely low in human bile salts. NaTLC forms aggregates with other lipids in the bile and functions as an emulsifying and solubilizing agent. The molecular structure of NaTLC contains hydrophilic hydroxyl and sulfonic acid groups at both ends of the steroid ring. This molecular structure is similar to bolaform amphiphilic substance having hydrophilic groups at both ends due to the characteristics of its molecular structure. This study investigated the aggregate properties of the NaTLC using surface tension measurements, light scattering, small-angle X-ray scattering (SAXS), and cryo-transmission electron microscopy (cryo-TEM). Surface tension measurement showed that the surface tension of the NaTLC solution decreased to 54 mN m-1. The concentration that showed the minimum surface tension corresponded to the critical micelle concentration (CMC: 0.6 mmol L-1, 308 K) determined by the change in light scattering intensity. On the other hand, the degree of counterion (sodium ions) binding to the micelles increased with increasing NaTLC concentration. SAXS and cryo-TEM measurements showed that the NaTLC formed large string-like micelles. The surface activity and large aggregates showed the potential for use as biosurfactants. However, because of the relatively low solubility of NaTLC in water, its use as a biosurfactant is limited to a narrow concentration range.
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Affiliation(s)
- Keisuke Matsuoka
- Faculty of Education, Laboratory of Chemistry, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama 338-8570, Japan.
| | - Rina Sekiguchi
- Faculty of Education, Laboratory of Chemistry, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama 338-8570, Japan
| | - Tomokazu Yoshimura
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoyanishi-machi, Nara 630-8506, Japan
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3
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Matamoros-Recio A, Alonso-Rueda E, Borrego E, Caballero A, Pérez PJ, Martín-Santamaría S. Molecular Dynamic Simulations of Aqueous Micellar Organometallic Catalysis: Methane Functionalization as a Case Study. Angew Chem Int Ed Engl 2024; 63:e202314773. [PMID: 38055325 DOI: 10.1002/anie.202314773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 12/05/2023] [Accepted: 12/06/2023] [Indexed: 12/07/2023]
Abstract
Molecular Dynamics (MD) simulations constitute a powerful tool that provides a 3D perspective of the dynamical behavior of chemical systems. Herein the first MD study of the dynamics of a catalytic organometallic system, in micellar media, is presented. The challenging methane catalytic functionalization into ethyl propionate through a silver-catalyzed process has been targeted as the case study. The intimate nature of the micelles formed with the surfactants sodium dodecylsulfate (SDS) and potassium perfluorooctane sulfonate (PFOS) has been ascertained, as well as the relative distribution of the main actors in this transformation, namely methane, the diazo reagent and the silver catalyst, the latter in two different forms: the initial compound and a silver-carbene intermediate. Catalyst deactivation occurs with halide containing surfactants dodecyltrimethylammonium chloride (DTAC) and Triton X-100. Computed simulations allow explaining the experimental results, indicating that micelles behave differently regarding the degree of accumulation and the local distribution of the reactants and their effect in the molecular collisions leading to net reaction.
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Affiliation(s)
- Alejandra Matamoros-Recio
- Department of Structural and Chemical Biology, Centro de Investigaciones Biológicas Margarita Salas (CSIC), 28040, Madrid, Spain
| | - Elia Alonso-Rueda
- Department of Structural and Chemical Biology, Centro de Investigaciones Biológicas Margarita Salas (CSIC), 28040, Madrid, Spain
| | - Elena Borrego
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007, Huelva, Spain
| | - Ana Caballero
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007, Huelva, Spain
| | - Pedro J Pérez
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Química, Universidad de Huelva, 21007, Huelva, Spain
| | - Sonsoles Martín-Santamaría
- Department of Structural and Chemical Biology, Centro de Investigaciones Biológicas Margarita Salas (CSIC), 28040, Madrid, Spain
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4
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Bjørnestad V, Lund R. Pathways of Membrane Solubilization: A Structural Study of Model Lipid Vesicles Exposed to Classical Detergents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:3914-3933. [PMID: 36893452 PMCID: PMC10035035 DOI: 10.1021/acs.langmuir.2c03207] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 02/17/2023] [Indexed: 06/18/2023]
Abstract
Understanding the pathways of solubilization of lipid membranes is of high importance for their use in biotechnology and industrial applications. Although lipid vesicle solubilization by classical detergents has been widely investigated, there are few systematic structural and kinetic studies where different detergents are compared under varying conditions. This study used small-angle X-ray scattering to determine the structures of lipid/detergent aggregates at different ratios and temperatures and studied the solubilization in time using the stopped-flow technique. Membranes composed of either of two zwitterionic lipids, DMPC or DPPC, and their interactions with three different detergents, sodium dodecyl sulfate (SDS), n-dodecyl-beta-maltoside (DDM), and Triton X-100 (TX-100), were tested. The detergent TX-100 can cause the formation of collapsed vesicles with a rippled bilayer structure that is highly resistant to TX-100 insertion at low temperatures, while at higher temperatures, it partitions and leads to the restructuring of vesicles. DDM also causes this restructuring into multilamellar structures at subsolubilizing concentrations. In contrast, partitioning of SDS does not alter the vesicle structure below the saturation limit. Solubilization is more efficient in the gel phase for TX-100 but only if the cohesive energy of the bilayer does not prevent sufficient partitioning of the detergent. DDM and SDS show less temperature dependence compared to TX-100. Kinetic measurements reveal that solubilization of DPPC largely occurs through a slow extraction of lipids, whereas DMPC solubilization is dominated by fast and burst-like solubilization of the vesicles. The final structures obtained seem to preferentially be discoidal micelles where the detergent can distribute in excess along the rim of the disc, although we do observe the formation of worm- and rodlike micelles in the case of solubilization of DDM. Our results are in line with the suggested theory that bilayer rigidity is the main factor influencing which aggregate is formed.
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5
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Goryo S, Iwata K. Photoionization of 3-Methylindole Embedded in Sodium Dodecyl Sulfate and Dodecyltrimethylammonium Chloride Micelles: Migration of Electrons Generated in Micelle Cores and Their Solvation in Outside Water. J Phys Chem Lett 2023; 14:1479-1484. [PMID: 36744965 DOI: 10.1021/acs.jpclett.2c03799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Electrons were generated in the core of micelles formed by negatively charged sodium dodecyl sulfate (SDS) or positively charged dodecyltrimethylammonium chloride (DTAC) by photoionization of 3-methylindole embedded in the core. The electrons were hydrated after they moved out of the core to the outer aqueous phase. These processes were monitored with femtosecond time-resolved absorption spectroscopy. The migration of electrons from the micelle core to the outer aqueous phase was faster than the instrumental response time of 200 fs. Hot electrons in the aqueous phase were produced in ≤320 fs. There was no significant difference observed for the micellar solutions of negatively charged SDS and positively charged DTAC, or for water. The geminate recombination between the electrons and the radical cations was hindered to a large extent once the electrons hydrated at the outer aqueous phase were separated from the radical cations remaining in the micelle core.
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Affiliation(s)
- Shion Goryo
- Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-Ku, Tokyo171-8588, Japan
| | - Koichi Iwata
- Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-Ku, Tokyo171-8588, Japan
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6
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Matsuoka K, Sato A, Ogawa Y, Okazaki K, Yada S, Yoshimura T. Micelle Formation of Dodecanoic Acid with Alkali Metal Counterions. J Oleo Sci 2023; 72:831-837. [PMID: 37648460 DOI: 10.5650/jos.ess23086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023] Open
Abstract
Alkali series with different atomic numbers affect the physicochemical properties of aqueous solutions. The micellar properties of aqueous solutions of dodecanoate as surfactants were measured by changing the counterions (C12-Na, C12-K, C12-Rb, and C12-Cs). A plot of Krafft temperature vs. alkali metal atomic number showed a downward convex curve, with its minimum temperature (20°C) in the C12-K system. By contrast, a plot of the critical micelle concentration (CMC) vs. alkali metal atomic number exhibited an upward convex curve with the maximum CMC (25.6 mmol L-1) at C12-K. Furthermore, the minimum surface tension (γ min ) of the solution at the CMC increased with increasing atomic number (C12-Na ≈ C12-K < C12-Rb < C12-Cs). The size of the dodecanoate micelles decreased with increasing atomic number. The ionization degree of the micelles also increased with increasing atomic number of the alkali metal. Small-angle X-ray scattering (SAXS) measurements revealed that alkali dodecanoate micelles formed spherical to ellipsoidal structures. In addition, micelles from the shell region showed large electrostatic repulsion, judging from the shape of the spectrum in the higher Q -1 region. From the measurement results of the solubilization of naphthalene into the micelles, the size of the micelles corresponded to the maximum solubilization quantity of naphthalene.
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Affiliation(s)
- Keisuke Matsuoka
- Faculty of Education, Laboratory of Chemistry, Saitama University
| | - Aiko Sato
- Faculty of Education, Laboratory of Chemistry, Saitama University
| | - Yukino Ogawa
- Faculty of Education, Laboratory of Chemistry, Saitama University
| | - Kana Okazaki
- Faculty of Education, Laboratory of Chemistry, Saitama University
| | - Shiho Yada
- Department of Chemistry, Faculty of Science and Graduate School of Science, Nara Women's University
| | - Tomokazu Yoshimura
- Department of Chemistry, Faculty of Science and Graduate School of Science, Nara Women's University
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7
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Probing plausible role of anionic surfactants in inducing structural alternations in HEWL with Fe-containing metallo-catanionic aggregates. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Matsuoka K, Sato Y, Takashima S, Goto Y. Removal of ionic dyes with different charges by foam separation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.118994] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Sanchez-Fernandez A, Jackson AJ, Prévost SF, Doutch JJ, Edler KJ. Long-Range Electrostatic Colloidal Interactions and Specific Ion Effects in Deep Eutectic Solvents. J Am Chem Soc 2021; 143:14158-14168. [PMID: 34459188 PMCID: PMC8431340 DOI: 10.1021/jacs.1c04781] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Indexed: 12/31/2022]
Abstract
While the traditional consensus dictates that high ion concentrations lead to negligible long-range electrostatic interactions, we demonstrate that electrostatic correlations prevail in deep eutectic solvents where intrinsic ion concentrations often surpass 2.5 M. Here we present an investigation of intermicellar interactions in 1:2 choline chloride:glycerol and 1:2 choline bromide:glycerol using small-angle neutron scattering. Our results show that long-range electrostatic repulsions between charged colloidal particles occur in these solvents. Interestingly, micelle morphology and electrostatic interactions are modulated by specific counterion condensation at the micelle interface despite the exceedingly high concentration of the native halide from the solvent. This modulation follows the trends described by the Hofmeister series for specific ion effects. The results are rationalized in terms of predominant ion-ion correlations, which explain the reduction in the effective ionic strength of the continuum and the observed specific ion effects.
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Affiliation(s)
| | - Andrew J. Jackson
- European
Spallation Source, Box
176, 221 00 Lund, Sweden
- Department
of Physical Chemistry, Lund University, Lund, SE-221 00, Sweden
| | | | - James J. Doutch
- ISIS
Neutron and Muon Source, Science and Technology
Facilities Council, Rutherford Appleton
Laboratory, Didcot, OX11 0QX, U.K.
| | - Karen J. Edler
- Department
of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, U.K.
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10
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Ludwig M, Geisler R, Prévost S, von Klitzing R. Shape and Structure Formation of Mixed Nonionic-Anionic Surfactant Micelles. Molecules 2021; 26:molecules26144136. [PMID: 34299413 PMCID: PMC8307929 DOI: 10.3390/molecules26144136] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 06/29/2021] [Accepted: 07/03/2021] [Indexed: 11/16/2022] Open
Abstract
Aqueous solutions of a nonionic surfactant (either Tween20 or BrijL23) and an anionic surfactant (sodium dodecyl sulfate, SDS) are investigated, using small-angle neutron scattering (SANS). SANS spectra are analysed by using a core-shell model to describe the form factor of self-assembled surfactant micelles; the intermicellar interactions are modelled by using a hard-sphere Percus–Yevick (HS-PY) or a rescaled mean spherical approximation (RMSA) structure factor. Choosing these specific nonionic surfactants allows for comparison of the effect of branched (Tween20) and linear (BrijL23) surfactant headgroups, both constituted of poly-ethylene oxide (PEO) groups. The nonionic–anionic surfactant mixtures are studied at various concentrations up to highly concentrated samples (ϕ ≲ 0.45) and various mixing ratios, from pure nonionic to pure anionic surfactant solutions. The scattering data reveal the formation of mixed micelles already at concentrations below the critical micelle concentration of SDS. At higher volume fractions, excluded volume effects dominate the intermicellar structuring, even for charged micelles. In consequence, at high volume fractions, the intermicellar structuring is the same for charged and uncharged micelles. At all mixing ratios, almost spherical mixed micelles form. This offers the opportunity to create a system of colloidal particles with a variable surface charge. This excludes only roughly equimolar mixing ratios (X≈ 0.4–0.6) at which the micelles significantly increase in size and ellipticity due to specific sulfate–EO interactions.
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Affiliation(s)
- Michael Ludwig
- Soft Matter at Interfaces, Institute for Condensed Matter Physics, Technical University of Darmstadt, D-64289 Darmstadt, Germany; (M.L.); (R.G.)
| | - Ramsia Geisler
- Soft Matter at Interfaces, Institute for Condensed Matter Physics, Technical University of Darmstadt, D-64289 Darmstadt, Germany; (M.L.); (R.G.)
| | - Sylvain Prévost
- Large Scale Structures Group, DS/LSS, Institut Laue-Langevin, CEDEX 9, 38042 Grenoble, France;
| | - Regine von Klitzing
- Soft Matter at Interfaces, Institute for Condensed Matter Physics, Technical University of Darmstadt, D-64289 Darmstadt, Germany; (M.L.); (R.G.)
- Correspondence:
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11
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Schäfer K, Kolli HB, Killingmoe Christensen M, Bore SL, Diezemann G, Gauss J, Milano G, Lund R, Cascella M. Supramolecular Packing Drives Morphological Transitions of Charged Surfactant Micelles. Angew Chem Int Ed Engl 2020; 59:18591-18598. [PMID: 32543728 PMCID: PMC7589243 DOI: 10.1002/anie.202004522] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 05/29/2020] [Indexed: 12/16/2022]
Abstract
The shape and size of self-assembled structures upon local organization of their molecular building blocks are hard to predict in the presence of long-range interactions. Combining small-angle X-ray/neutron scattering data, theoretical modelling, and computer simulations, sodium dodecyl sulfate (SDS), over a broad range of concentrations and ionic strengths, was investigated. Computer simulations indicate that micellar shape changes are associated with different binding of the counterions. By employing a toy model based on point charges on a surface, and comparing it to experiments and simulations, it is demonstrated that the observed morphological changes are caused by symmetry breaking of the irreducible building blocks, with the formation of transient surfactant dimers mediated by the counterions that promote the stabilization of cylindrical instead of spherical micelles. The present model is of general applicability and can be extended to all systems controlled by the presence of mobile charges.
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Affiliation(s)
- Ken Schäfer
- Department ChemieJohannes Gutenberg-Universität MainzDuesbergweg 10–1455128MainzGermany
| | - Hima Bindu Kolli
- Department of Physics and AstronomyThe University of SheffieldWestern BankSheffieldS10 2TNUK
| | - Mikkel Killingmoe Christensen
- Department of Chemistry and Hylleraas Centre for Quantum Molecular SciencesUniversity of OsloPO-Box 1033 Blindern0315OsloNorway
| | - Sigbjørn Løland Bore
- Department of Chemistry and Hylleraas Centre for Quantum Molecular SciencesUniversity of OsloPO-Box 1033 Blindern0315OsloNorway
| | - Gregor Diezemann
- Department ChemieJohannes Gutenberg-Universität MainzDuesbergweg 10–1455128MainzGermany
| | - Jürgen Gauss
- Department ChemieJohannes Gutenberg-Universität MainzDuesbergweg 10–1455128MainzGermany
| | - Giuseppe Milano
- Department of Organic Materials ScienceYamagata University4-3-16 JonanYonezawaYamagata-ken992-8510Japan
| | - Reidar Lund
- Department of Chemistry and Hylleraas Centre for Quantum Molecular SciencesUniversity of OsloPO-Box 1033 Blindern0315OsloNorway
| | - Michele Cascella
- Department of Chemistry and Hylleraas Centre for Quantum Molecular SciencesUniversity of OsloPO-Box 1033 Blindern0315OsloNorway
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12
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Schäfer K, Kolli HB, Killingmoe Christensen M, Bore SL, Diezemann G, Gauss J, Milano G, Lund R, Cascella M. Supramolecular Packing Drives Morphological Transitions of Charged Surfactant Micelles. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004522] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ken Schäfer
- Department Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10–14 55128 Mainz Germany
| | - Hima Bindu Kolli
- Department of Physics and Astronomy The University of Sheffield Western Bank Sheffield S10 2TN UK
| | - Mikkel Killingmoe Christensen
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences University of Oslo PO-Box 1033 Blindern 0315 Oslo Norway
| | - Sigbjørn Løland Bore
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences University of Oslo PO-Box 1033 Blindern 0315 Oslo Norway
| | - Gregor Diezemann
- Department Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10–14 55128 Mainz Germany
| | - Jürgen Gauss
- Department Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10–14 55128 Mainz Germany
| | - Giuseppe Milano
- Department of Organic Materials Science Yamagata University 4-3-16 Jonan Yonezawa Yamagata-ken 992-8510 Japan
| | - Reidar Lund
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences University of Oslo PO-Box 1033 Blindern 0315 Oslo Norway
| | - Michele Cascella
- Department of Chemistry and Hylleraas Centre for Quantum Molecular Sciences University of Oslo PO-Box 1033 Blindern 0315 Oslo Norway
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13
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Bryant SJ, Atkin R, Gradzielski M, Warr GG. Catanionic Surfactant Self-Assembly in Protic Ionic Liquids. J Phys Chem Lett 2020; 11:5926-5931. [PMID: 32628489 DOI: 10.1021/acs.jpclett.0c01608] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Mixing of cationic and anionic surfactants in water can result in pseudo-double-tailed catanionic surfactant ion pairs that form lamellar phases or vesicles that are unstable toward electrolyte addition. Here we show that despite the very high ionic strengths, catanionic surfactants counterintuitively form a wider variety of self-assembled aggregates in pure ionic liquids (ILs, pure salts in a liquid phase) than in water, including micelles, vesicles, and lyotropic phases. Self-assembled structures only form when the IL is sufficiently polar to drive self-assembly through electrostatic interactions and/or H-bond networks, but the catanionic effect is manifested only when the IL does not itself exhibit pronounced amphiphilic nanostructure. This enables the type of catanionic aggregate formed to be designed by changing the hydrogen bonds between the ions through variation of the structures of the cation and anion. These results reveal an entirely new way of controlling catanionic surfactant self-assembly under nonaqueous and high-salt conditions.
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Affiliation(s)
- Saffron J Bryant
- School of Chemistry and Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Rob Atkin
- School of Molecular Sciences, University of Western Australia, Crawley, WA 6009, Australia
| | - Michael Gradzielski
- Institute for Chemistry, Technische Universität Berlin, Strasse des 17 Juni 124, D-10623 Berlin, Germany
| | - Gregory G Warr
- School of Chemistry and Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
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14
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Crivello C, Lazzara G, Chiappisi L. On the effect of the nature of counterions on the self-assembly of polyoxyethylene alkyl ether carboxylic acids. SOFT MATTER 2020; 16:7137-7143. [PMID: 32662480 DOI: 10.1039/d0sm00986e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this contribution, we investigate the effect of the type of counterion on the properties of dilute solutions of polyoxyethylene alkyl ether carboxylic acids. Two different surfactants, presenting an oleic acid alkyl chain and on-average five and nine ethylene oxide units, and terminated by a weakly anionic carboxymethyl group were studied. The surfactants were gradually ionized with sodium hydroxide, arginine, and choline hydroxide. The solutions properties were probed by light scattering, electrophoretic mobility, density and sound velocity measurements, as well as by small-angle neutron scattering. To our initial surprise, no specific effect arising from the nature of the counterion could be determined. We ascribe this phenomenon to the fact that the presence of the ethylene oxide units markedly dilutes the surfactant head group charge density, reducing counterion condensation and subsequent counterion specific effects.
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Affiliation(s)
- Chiara Crivello
- Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs, 38042 Grenoble, France. and Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze pad 17, 90128 Palermo, Italy
| | - Giuseppe Lazzara
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze pad 17, 90128 Palermo, Italy
| | - Leonardo Chiappisi
- Institut Max von Laue - Paul Langevin, 71 avenue des Martyrs, 38042 Grenoble, France.
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15
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Goto Y, Nema Y, Matsuoka K. Foam Separation of Dyes Using Anionic, Cationic, and Amphoteric Surfactants. J Oleo Sci 2020; 69:549-555. [PMID: 32522916 DOI: 10.5650/jos.ess20004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Foam separation can selectively remove a target substance from a solution via adsorption of the substance with the surfactant at the surface of the bubble. A cationic dye, methylene blue, and an anionic dye, Fast Green FCF, were prepared as substances to be removed via foam separation. Anionic (sodium dodecyl sulfate, SDS), cationic (dodecyltrimethylammonium chloride, DTAC), and amphoteric (3-(dodecyldimethylammonio)propane-1-sulfonate, SB-12) surfactants were used in the foam separation process. The effectiveness of the surfactants for removing the cationic methylene blue increased as follows: DTAC < SB-12 < SDS. On the other hand, the effectiveness of the surfactants for removing the anionic Fast Green FCF was in the opposite order. The dyes were effectively adsorbed by the foams via electrostatic interactions between the oppositely charged surfactant and the dye molecules. Since amphoteric surfactants have both anionic and cationic charges in a molecule, they could effectively remove both dyes in the foam separation process. Therefore, it was found that the amphoteric surfactant was highly versatile. Analysis of the kinetics of the removal rate showed that the aqueous solutions of monomers could remove the dyes more effectively than micellar solutions in foam separation.
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Affiliation(s)
- Yusuke Goto
- Faculty of Education, Laboratory of Chemistry, Saitama University
| | - Yuya Nema
- Faculty of Education, Laboratory of Chemistry, Saitama University
| | - Keisuke Matsuoka
- Faculty of Education, Laboratory of Chemistry, Saitama University
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16
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Catanionic and chain-packing effects on surfactant self-assembly in the ionic liquid ethylammonium nitrate. J Colloid Interface Sci 2019; 540:515-523. [DOI: 10.1016/j.jcis.2019.01.048] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 01/11/2019] [Accepted: 01/11/2019] [Indexed: 11/19/2022]
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17
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Micellar transition (ellipsoidal to ULV) induced in aqueous Gemini surfactant (12-2-12) solution as a function of additive concentration and temperature using experimental and theoretical study. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.06.070] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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18
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Vashishat R, Sanan R, Ray D, Aswal VK, Mahajan RK. Biamphiphilic Ionic Liquids-Drug Mixtures: Interactional and Morphological Aspects. ChemistrySelect 2018. [DOI: 10.1002/slct.201801296] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Rajni Vashishat
- Department of Chemistry; UGC-Centre for Advanced Studied; Guru Nanak Dev University; Amritsar - 143005 India
| | - Reshu Sanan
- Department of Chemistry; Punjab Technical University; Kapurthala - 144601 India
| | - Debes Ray
- Solid State Physics Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | - Vinod Kumar Aswal
- Solid State Physics Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | - Rakesh Kumar Mahajan
- Department of Chemistry; UGC-Centre for Advanced Studied; Guru Nanak Dev University; Amritsar - 143005 India
- Vice Chancellor; DAV University; Jalandhar - 144001 India
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19
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Schwarze M, Schaefer L, Chiappisi L, Gradzielski M. Micellar enhanced ultrafiltration (MEUF) of methylene blue with carboxylate surfactants. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2018.01.043] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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20
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Chiappisi L. Polyoxyethylene alkyl ether carboxylic acids: An overview of a neglected class of surfactants with multiresponsive properties. Adv Colloid Interface Sci 2017; 250:79-94. [PMID: 29056232 DOI: 10.1016/j.cis.2017.10.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 10/07/2017] [Accepted: 10/10/2017] [Indexed: 12/14/2022]
Abstract
In this work, an overview on aqueous solutions of polyoxyethylene alkyl ether carboxylic acids is given. Unique properties arise from the combination of the nonionic, temperature-responsive polyoxyethylene block with the weakly ionic, pH-responsive carboxylic acid termination in a single surfactant headgroup. Accordingly, this class of surfactant finds broad application across very different sectors. Despite their large use on an industrial and a technical scale, the literature lacks a systematic and detailed characterization of their physico-chemical properties which is provided herein. In addition, a comprehensive overview is given of their self-assembly and interfacial behavior, of their use as colloidal building blocks and for large-scale applications.
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Affiliation(s)
- Leonardo Chiappisi
- Technische Universität Berlin, Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Straße des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany; Institut Max von Laue - Paul Langevin, Large Scale Structures Group, 71 avenue des Martyrs, Grenoble Cedex 9 38042, France.
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21
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Dhawan VV, Nagarsenker MS. Catanionic systems in nanotherapeutics – Biophysical aspects and novel trends in drug delivery applications. J Control Release 2017; 266:331-345. [DOI: 10.1016/j.jconrel.2017.09.040] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Accepted: 09/28/2017] [Indexed: 01/10/2023]
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22
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Russo Krauss I, Imperatore R, De Santis A, Luchini A, Paduano L, D'Errico G. Structure and dynamics of cetyltrimethylammonium chloride-sodium dodecylsulfate (CTAC-SDS) catanionic vesicles: High-value nano-vehicles from low-cost surfactants. J Colloid Interface Sci 2017; 501:112-122. [PMID: 28437699 DOI: 10.1016/j.jcis.2017.04.032] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 04/09/2017] [Accepted: 04/10/2017] [Indexed: 12/11/2022]
Abstract
HYPOTHESIS Catanionic vesicles based on large-scale produced surfactants represent a promising platform for the design of innovative, effective and relatively inexpensive nano-vehicles for a variety of actives. Structural, dynamic and functional behavior of these aggregates is finely tuned by the molecular features of their components and can be opportunely tailored for their applications as drug carriers. EXPERIMENTS Here we investigate the aggregates formed by CTAC and SDS, two of the most diffused surfactants, by means of Dynamic Light Scattering, Small Angle Neutron Scattering and Electron Paramagnetic Resonance spectroscopy (EPR). The exploitation of these aggregates as nano-vehicles is explored using the poorly water-soluble antioxidant trans-resveratrol (t-RESV), testing t-RESV solubility and antioxidant activity by means of UV, fluorescence spectroscopy and EPR. FINDINGS The presence of a large stability region of catanionic vesicles on the CTAC-rich side of the phase diagram is highlighted and interpreted in terms of the mismatch between the lengths of the surfactant tails and of first reported effects of the chloride counterions. CTAC-SDS vesicles massively solubilize t-RESV, which in catanionic vesicles exerts a potent antioxidant and radical-scavenging activity. This behavior arises from the positioning of the active at the surface of the vesicular aggregates thus being sufficiently exposed to the external medium.
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Affiliation(s)
- Irene Russo Krauss
- Department of Chemical Sciences, University of Naples ''Federico II'', Complesso di Monte S. Angelo, Via Cinthia, I-80126 Naples, Italy; CSGI (Consorzio per lo Sviluppo dei Sistemi a Grande Interfase), via della Lastruccia 3, I-50019 Florence, Italy
| | - Riccardo Imperatore
- Department of Chemical Sciences, University of Naples ''Federico II'', Complesso di Monte S. Angelo, Via Cinthia, I-80126 Naples, Italy; CSGI (Consorzio per lo Sviluppo dei Sistemi a Grande Interfase), via della Lastruccia 3, I-50019 Florence, Italy
| | - Augusta De Santis
- Department of Chemical Sciences, University of Naples ''Federico II'', Complesso di Monte S. Angelo, Via Cinthia, I-80126 Naples, Italy; CSGI (Consorzio per lo Sviluppo dei Sistemi a Grande Interfase), via della Lastruccia 3, I-50019 Florence, Italy
| | - Alessandra Luchini
- Department of Chemical Sciences, University of Naples ''Federico II'', Complesso di Monte S. Angelo, Via Cinthia, I-80126 Naples, Italy; CSGI (Consorzio per lo Sviluppo dei Sistemi a Grande Interfase), via della Lastruccia 3, I-50019 Florence, Italy; Institut Laue-Langevin, BP 156, 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Luigi Paduano
- Department of Chemical Sciences, University of Naples ''Federico II'', Complesso di Monte S. Angelo, Via Cinthia, I-80126 Naples, Italy; CSGI (Consorzio per lo Sviluppo dei Sistemi a Grande Interfase), via della Lastruccia 3, I-50019 Florence, Italy
| | - Gerardino D'Errico
- Department of Chemical Sciences, University of Naples ''Federico II'', Complesso di Monte S. Angelo, Via Cinthia, I-80126 Naples, Italy; CSGI (Consorzio per lo Sviluppo dei Sistemi a Grande Interfase), via della Lastruccia 3, I-50019 Florence, Italy.
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Vashishat R, Chabba S, Mahajan RK. Effect of surfactant head group on micellization and morphological transitions in drug-Surfactant catanionic mixture: A multi-technique approach. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.03.058] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Wang P, Ma Y, Liu Z, Yan Y, Sun X, Zhang J. Vesicle formation of catanionic mixtures of CTAC/SDS induced by ratio: a coarse-grained molecular dynamic simulation study. RSC Adv 2016. [DOI: 10.1039/c5ra26051e] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
A vesicle was formed by disk-like bilayer curling.
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Affiliation(s)
- Pan Wang
- College of Science
- China University of Petroleum
- 266580 Qingdao
- People's Republic of China
- Key Laboratory of New Energy Physics & Materials Science in Universities of Shandong
| | - Yunyun Ma
- College of Science
- China University of Petroleum
- 266580 Qingdao
- People's Republic of China
- Key Laboratory of New Energy Physics & Materials Science in Universities of Shandong
| | - Zhibin Liu
- College of Science
- China University of Petroleum
- 266580 Qingdao
- People's Republic of China
- Key Laboratory of New Energy Physics & Materials Science in Universities of Shandong
| | - Youguo Yan
- College of Science
- China University of Petroleum
- 266580 Qingdao
- People's Republic of China
- Key Laboratory of New Energy Physics & Materials Science in Universities of Shandong
| | - Xiaoli Sun
- College of Science
- China University of Petroleum
- 266580 Qingdao
- People's Republic of China
| | - Jun Zhang
- College of Science
- China University of Petroleum
- 266580 Qingdao
- People's Republic of China
- Key Laboratory of New Energy Physics & Materials Science in Universities of Shandong
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25
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Phase behaviour and vesicle formation in catanionic mixtures of Na oleate and alkyl trimethyl ammonium bromide and its salt-free version. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3737-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Schwarze M, Groß M, Moritz M, Buchner G, Kapitzki L, Chiappisi L, Gradzielski M. Micellar enhanced ultrafiltration (MEUF) of metal cations with oleylethoxycarboxylate. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2015.01.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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27
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Vashishat R, Sanan R, Mahajan RK. Bile salt-surface active ionic liquid mixtures: mixed micellization and solubilization of phenothiazine. RSC Adv 2015. [DOI: 10.1039/c5ra09812b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Solubilization of phenothiazine is studied. Phenothiazine is more solubilized in the core of mixed micelles of sodium deoxycholate and ionic liquid. Sodium deoxycholate is more hydrophobic in nature than sodium cholate.
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Affiliation(s)
- Rajni Vashishat
- Department of Chemistry
- UGC-Centre for Advanced Studies Guru Nanak Dev University
- Amritsar-143005
- India
| | - Reshu Sanan
- P. G. Department of Chemistry
- Khalsa College
- Amritsar-143002
- India
| | - Rakesh Kumar Mahajan
- Department of Chemistry
- UGC-Centre for Advanced Studies Guru Nanak Dev University
- Amritsar-143005
- India
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28
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Pucci C, Pérez L, La Mesa C, Pons R. Characterization and stability of catanionic vesicles formed by pseudo-tetraalkyl surfactant mixtures. SOFT MATTER 2014; 10:9657-9667. [PMID: 25356774 DOI: 10.1039/c4sm01575d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The phase behavior of an ad hoc synthesized surfactant, sodium 8-hexadecylsulfate (8-SHS), and its mixtures with didecyldimethylammonium bromide (DiDAB) in water is reported. We dealt with dilute concentration regimes, at a total surfactant content of <30 mmol kg(-1) where vesicular aggregates may be formed. The high synergistic behavior of such catanionic mixtures is concomitant with strongly negative interaction parameters, β (≈-18 kBT), significant gain in the free energy of association, ΔGagg, and much lower association concentration compared to the pure surfactants. Vesicle size and ζ-potential depend on the mixture composition. Hydrodynamic diameters increase by progressive addition of oppositely charged surfactants to the one in excess. Counter-intuitively, the ζ-potential becomes more negative at DiDAB molar fractions close to 0.2. The same holds in the reverse case, the ζ-potential becomes more positive after small additions of 8-SHS; anyhow, the effect is more significant in anionic-rich mixtures. This phenomenon was explained by assuming a significant release of counterions and an asymmetric distribution of the two surfactants in the inner and outer vesicle leaflets. The equimolar mixtures form a cubic phase rather than the expected lamellar one. The effect of NaBr concentration on the stability of catanionic vesicles was also investigated. At high NaBr concentrations, all systems are destabilized. For DiDAB-rich vesicles, flocculation is observed, while for 8-SHS-rich ones, lamellar domains are formed at the bottom of the samples. The role played by NaBr depends on whether it is added before or after mixing the surfactants. In particular, preformed catanionic vesicles show a great kinetic stability towards addition of NaBr compared to those obtained by other procedures.
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Affiliation(s)
- Carlotta Pucci
- Department of Chemistry, La Sapienza University, Cannizzaro Building, P.le A. Moro 5, I-00185 Rome, Italy.
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29
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Ji X, Shi C, Qi L, Guo Y, Li N, Li Z, Luan Y. Preparation, properties and in vivo pharmacokinetic study of drug vesicles composed of diphenhydramine and AOT. RSC Adv 2014. [DOI: 10.1039/c4ra09294e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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30
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Schwarze M, Chiappisi L, Prévost S, Gradzielski M. Oleylethoxycarboxylate – An efficient surfactant for copper extraction and surfactant recycling via micellar enhanced ultrafiltration. J Colloid Interface Sci 2014; 421:184-90. [DOI: 10.1016/j.jcis.2014.01.037] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2013] [Revised: 01/27/2014] [Accepted: 01/28/2014] [Indexed: 10/25/2022]
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31
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Sanan R, Kaur R, Mahajan RK. Micellar transitions in catanionic ionic liquid–ibuprofen aqueous mixtures; effects of composition and dilution. RSC Adv 2014. [DOI: 10.1039/c4ra10840j] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Interactions between 1-dodecyl-3-methylimidazolium chloride and ibuprofen molecules in aqueous solution form catanionic mixtures, with morphologies of mixed micelles dependent on solution composition.
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Affiliation(s)
- Reshu Sanan
- Department of Chemistry
- UGC-Centre for Advanced Studies
- Guru Nanak Dev University
- Amritsar-143005, India
| | - Rajwinder Kaur
- Department of Chemistry
- UGC-Centre for Advanced Studies
- Guru Nanak Dev University
- Amritsar-143005, India
| | - Rakesh Kumar Mahajan
- Department of Chemistry
- UGC-Centre for Advanced Studies
- Guru Nanak Dev University
- Amritsar-143005, India
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Pal A, Bharath P, Dastidar SG, Raghunathan VA. Thermal unbinding and ordering of amphiphile bilayers in the presence of salt. J Colloid Interface Sci 2013; 402:151-6. [PMID: 23643253 DOI: 10.1016/j.jcis.2013.03.063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 03/08/2013] [Accepted: 03/11/2013] [Indexed: 10/27/2022]
Abstract
We have studied the effect of KBr on the electrostatically stabilized fluid lamellar phase of the ionic surfactant, C12-alkenylsuccinic acid (ASA). Three distinct regimes are found in the temperature - salt phase diagram of this system at a fixed ASA concentration of 20 wt.%. A collapsed lamellar phase is formed in the low-salt regime, which exhibits an unbinding transition into uncorrelated bilayers on heating. In the intermediate salt regime the opposite trend is observed, with the uncorrelated bilayers present at low temperatures ordering into a lamellar phase at higher temperatures. As far as we are aware, this is the first report of such an ordering transition of uncorrelated bilayers. In the high salt regime, the topology of the bilayer changes, resulting in a lamellar-sponge transition. All the three transitions are reversible and the corresponding transition temperatures decrease with increasing salt concentration. The occurrence of these transitions in a single amphiphile system demonstrates the strong influence of salt on the bilayer elastic moduli as well as on the inter-bilayer interactions in the present system.
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Affiliation(s)
- Antara Pal
- Raman Research Institute, Bangalore, India
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33
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Zhang J, Xu G, Zhou Y, Zhou T, Zhai X. Polyhedral vesicles with crystalline bilayers formed from catanionic surfactant mixtures of fluorocarbon and hydrocarbon amphiphiles. J Colloid Interface Sci 2013; 407:318-26. [PMID: 23849823 DOI: 10.1016/j.jcis.2013.06.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 06/11/2013] [Accepted: 06/12/2013] [Indexed: 11/28/2022]
Abstract
Salt-free catanionic mixtures of perfluorononanoic acid (C8F17COOH) and tetradecyltrimethylammonium hydroxide (TTAOH) in aqueous solution show rich and interesting self-assembly properties. With the addition of TTAOH to a C8F17COOH solution, a structural transition from polyhedral vesicles with crystalline bilayers to spherical vesicles with fluid bilayers was observed at room temperature, which was demonstrated by cryo- and FF-TEM observations, DSC and WAXS measurements. It is interesting that both uni-lamellar and multi-lamellar polyhedral vesicles were formed in these fluoro- and hydrocarbon catanionic surfactant mixtures. SAXS measurements were performed to determine the interlamellar spacing of the multi-lamellar polyhedral vesicles. The driving force for the formation of the polyhedral vesicles was the crystallization of the C8F17COO(-) - TTA(+) ion pairs in the bilayers, which induced the excess anionic surfactants to be segregated and concentrated to produce the vertices of the polyhedral vesicles. Besides, the rheological results show that the rheological properties of the C8F17COOH/TTAOH system are greatly affected by the fluorocarbon chains due to their high rigidity and Krafft point. The solutions consisting of polyhedral vesicles have high viscoelasticity and high yield stress values while spherical vesicle solutions are not viscoelastic.
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Affiliation(s)
- Juan Zhang
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, PR China
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Hammouda B. Temperature Effect on the Nanostructure of SDS Micelles in Water. JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY 2013; 118:151-67. [PMID: 26401428 PMCID: PMC4487321 DOI: 10.6028/jres.118.008] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/02/2013] [Indexed: 05/10/2023]
Abstract
Sodium dodecyl sulfate (SDS) surfactants form micelles when dissolved in water. These are formed of a hydrocarbon core and hydrophilic ionic surface. The small-angle neutron scattering (SANS) technique was used with deuterated water (D2O) in order to characterize the micelle structure. Micelles were found to be slightly compressed (oblate ellipsoids) and their sizes shrink with increasing temperature. Fits of SANS data to the Mean Spherical Approximation (MSA) model yielded a calculated micelle volume fraction which was lower than the SDS surfactant (sample mixing) volume fraction; this suggests that part of the SDS molecules do not participate in micelle formation and remain homogeneously mixed in the solvent. A set of material balance equations allowed the estimation of the SDS fraction in the micelles. This fraction was found to be high (close to one) except for samples around 1 % SDS fraction. The micelle aggregation number was found to decrease with increasing temperature and/or decreasing SDS fraction.
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Liu CK, Warr GG. Resiliently spherical micelles of alkyltrimethylammonium surfactants with multivalent, hydrolyzable counterions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11007-11016. [PMID: 22642511 DOI: 10.1021/la301378j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A series of C(12)-C(16) alkyltrimethylammonium surfactants with hydrolyzable phosphate (PO(4)(3-), HPO(4)(2-), and H(2)PO(4)(-)), oxalate (HC(2)O(4)(-) and C(2)O(4)(2-)), and carbonate (HCO(3)(-) and CO(3)(2-)) counterions have been prepared, and their micellar solution behavior has been characterized. Critical micelle concentrations were measured using electrical conductivity and were found to depend on both the counterion and its hydrolysis state. All monovalent counterions bind less strongly to the micelle surface than does bromide or chloride, whereas multivalent species bind more strongly. Small-angle neutron scattering reveals that, unlike alkyltrimethylammonium bromides and chlorides, micelles are small and spherical in the presence of hydrolyzable counterions of all valences and remain spherical even in the presence of added electrolyte. This is consistent with the strong solvation of even strongly bound hydrolyzable counterions, which prevents the screening of repulsions between adjacent headgroups necessary for sphere-cylinder transformations. Salts of multivalent hydrolyzable counterions could thus be used to control the micelle structure in novel ways.
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Affiliation(s)
- Connie K Liu
- School of Chemistry F11, The University of Sydney, NSW, Australia
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36
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Diao ZY, Li L, Wang ZN, Lu J, Zhou W. Studies in the phase behavior of the microemulsions formed by mixed cationic and nonionic surfactants. COLLOID JOURNAL 2011. [DOI: 10.1134/s1061933x1105022x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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37
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Silvera-Batista CA, Ziegler KJ. Swelling the hydrophobic core of surfactant-suspended single-walled carbon nanotubes: a SANS study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11372-11380. [PMID: 21793553 DOI: 10.1021/la202117p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Localized solvent environments form around single-wall carbon nanotubes (SWCNTs) because of the ability of surfactant molecules to solubilize immiscible organic solvents. Although these microenvironments around SWCNTs have already been used for fundamental and applied studies, small-angle neutron scattering (SANS) was used here to assess the size and shape of the solvent domains, their uniformity and distribution on the sidewalls, and the effect of solvent swelling on the aggregation state of the suspension. SANS measurements confirm both the formation of local solvent environments and that no irreversible aggregation of the nanotube suspension occurs after the SDS molecules are swollen in solvent. The results also corroborate prior conclusions based on photoluminescence that the structure formed is dependent of the nature of the solvent-surfactant combination; SWCNTs suspended with SDS and swelled with benzene have a more uniform coating on the sidewall than those swelled with o-dichlorobenzene. These differences can be important to understanding the effect of the local environment on the photoluminescence properties and the interaction of SWCNTs with interfaces.
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Yousefi A, Javadian S, Gharibi H, Kakemam J, Rashidi-Alavijeh M. Cosolvent Effects on the Spontaneous Formation of Nanorod Vesicles in Catanionic Mixtures in the Rich Cationic Region. J Phys Chem B 2011; 115:8112-21. [DOI: 10.1021/jp202199d] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ali Yousefi
- Department of Physical Chemistry, Tarbiat Modares University, P.O. Box 14115-117, Tehran, Iran
| | - Soheila Javadian
- Department of Physical Chemistry, Tarbiat Modares University, P.O. Box 14115-117, Tehran, Iran
| | - Hussein Gharibi
- Department of Physical Chemistry, Tarbiat Modares University, P.O. Box 14115-117, Tehran, Iran
| | - Jamal Kakemam
- Department of Physical Chemistry, Tarbiat Modares University, P.O. Box 14115-117, Tehran, Iran
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Prévost S, Wattebled L, Laschewsky A, Gradzielski M. Formation of monodisperse charged vesicles in mixtures of cationic gemini surfactants and anionic SDS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:582-591. [PMID: 21142021 DOI: 10.1021/la103976p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The aggregation behavior of catanionics formed by the mixture of cationic geminis derived from dodecyltrimethylammonium chloride (DTAC) and anionic sodium dodecylsulfate (SDS) was studied by means of phase studies and comprehensive small-angle neutron scattering (SANS) experiments at 25 °C and 50 mM overall concentration. The results are compared to those for the previously studied SDS + DTAC system. Various gemini spacers of different natures and geometries were used, but all of them had similar lengths: an ethoxy bridge, a double bond, and an aromatic ring binding the two DTACs in three different substitutions (ortho, meta, and para). SANS and SAXS data analysis indicates that the spacer has no large effect on the spheroidal micelles of pure surfactants formed at low concentration in water; however, specific effects appear with the addition of electrolytes. Microstructures formed in the catanionic mixtures are rather strongly dependent on the nature of the spacer. The most important finding is that for the hydrophilic, flexible ethoxy bridge, monodisperse vesicles with a fixed anionic/cationic charge ratio (depending only on the surfactant in excess) are formed. Furthermore, the composition of these vesicles shows that strongly charged aggregates are formed. This study therefore provides new opportunities for developing tailor-made gemini surfactants that allow for the fine tuning of catanionic structures.
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Affiliation(s)
- Sylvain Prévost
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany.
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Lo Nostro P, Peruzzi N, Severi M, Ninham BW, Baglioni P. Asymmetric Partitioning of Anions in Lysozyme Dispersions. J Am Chem Soc 2010; 132:6571-7. [DOI: 10.1021/ja101603n] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pierandrea Lo Nostro
- Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino, Florence, Italy, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian National University, Canberra, Australia 0200
| | - Niccolò Peruzzi
- Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino, Florence, Italy, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian National University, Canberra, Australia 0200
| | - Mirko Severi
- Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino, Florence, Italy, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian National University, Canberra, Australia 0200
| | - Barry W. Ninham
- Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino, Florence, Italy, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian National University, Canberra, Australia 0200
| | - Piero Baglioni
- Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino, Florence, Italy, and Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Institute of Advanced Studies, Australian National University, Canberra, Australia 0200
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