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Nguyen NA, Liu DY, Krogstad DV. Impact of water and oleic acid on glycerol monooleate phase transition and bi-continuous structure formation in white oil. SOFT MATTER 2024; 20:7237-7245. [PMID: 39225494 DOI: 10.1039/d4sm00809j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
Production of biofuels from biological feedstocks, such as soybean oil, is an important piece of the transition to renewable energy sources. Processes have been developed to co-refine these feedstocks with traditional feedstocks, however, the high concentration of polar functional groups in biofeedstocks can cause a wide range of intermediate chemical reactions and interactions. An improved understanding of the interactions of biofeedstocks and their degradation products is needed to continue to expand the usage of biofeedstocks in fuel production. In this study, the equilibrium structures of glycerol monooleate (GMO), a common intermediate product of biofeedstock processing, in white mineral oil at a wide range of compositions, temperatures, and additional byproduct concentrations (water and/or oleic acid) were characterized using small angle X-ray scattering (SAXS). It was determined that GMO can exist as crystalline aggregates in white oil or as reverse micelles depending on the concentration and temperature. The critical micelle temperature increases significantly with increasing GMO concentration but remains relatively stable with increasing water or fatty acid concentration. Fitting of the SAXS data revealed that for many compositions, the GMO formed roughly spherical reverse micelles, however, at high water concentrations (∼1 wt%), the GMO formed elongated reverse micelles. Additionally, when >1 wt% oleic acid was added to the system, bi-continuous structures were stabilized rather than discreet reverse micelles. These results help increase our understanding of the structural behavior of biofeedstock intermediate products at concentrations and temperatures relevant to biofuel production and can enable processers to design systems and products that can either leverage or prevent these interactions for improved processing performance.
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Affiliation(s)
- Ngoc A Nguyen
- Illinois Applied Research Institute, University of Illinois Urbana Champaign, IL, 61801, USA.
| | - Deborah Y Liu
- Illinois Applied Research Institute, University of Illinois Urbana Champaign, IL, 61801, USA.
- Department of Materials Science and Engineering, University of Illinois Urbana Champaign, IL, 61801, USA
| | - Daniel V Krogstad
- Illinois Applied Research Institute, University of Illinois Urbana Champaign, IL, 61801, USA.
- Department of Materials Science and Engineering, University of Illinois Urbana Champaign, IL, 61801, USA
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2
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Stackhouse CI, Pierson KN, Labrecque CL, Mawson C, Berg J, Fuglestad B, Nucci NV. Characterization of 10MAG/LDAO reverse micelles: Understanding versatility for protein encapsulation. Biophys Chem 2024; 311:107269. [PMID: 38815545 PMCID: PMC11225088 DOI: 10.1016/j.bpc.2024.107269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 05/17/2024] [Accepted: 05/20/2024] [Indexed: 06/01/2024]
Abstract
Reverse micelles (RMs) are spontaneously organizing nanobubbles composed of an organic solvent, surfactants, and an aqueous phase that can encapsulate biological macromolecules for various biophysical studies. Unlike other RM systems, the 1-decanoyl-rac-glycerol (10MAG) and lauryldimethylamine-N-oxide (LDAO) surfactant system has proven to house proteins with higher stability than other RM mixtures with little sensitivity to the water loading (W0, defined by the ratio of water to surfactant). We investigated this unique property by encapsulating three model proteins - cytochrome c, myoglobin, and flavodoxin - in 10MAG/LDAO RMs and applying a variety of experimental methods to characterize this system's behavior. We found that this surfactant system differs greatly from the traditional, spherical, monodisperse RM population model. 10MAG/LDAO RMs were discovered to be oblate ellipsoids at all conditions, and as W0 was increased, surfactants redistributed to form a greater number of increasingly spherical ellipsoidal particles with pools of more bulk-like water. Proteins distinctively influence the thermodynamics of the mixture, encapsulating at their optimal RM size and driving protein-free RM sizes to scale accordingly. These findings inform the future development of similarly malleable encapsulation systems and build a foundation for application of 10MAG/LDAO RMs to analyze biological and chemical processes under nanoscale confinement.
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Affiliation(s)
- Crystal I Stackhouse
- Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States; Department of Biomedical and Biological Sciences, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States.
| | - Kali N Pierson
- Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States; Department of Biomedical and Biological Sciences, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States.
| | - Courtney L Labrecque
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States.
| | - Cara Mawson
- Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States; Department of Biomedical and Biological Sciences, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States.
| | - Joshua Berg
- Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States; Department of Biomedical and Biological Sciences, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States
| | - Brian Fuglestad
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States; Institute for Structural Biology, Drug Discovery and Development, Virginia Commonwealth University, Richmond, Virginia 23219, United States.
| | - Nathaniel V Nucci
- Department of Physics and Astronomy, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States; Department of Biomedical and Biological Sciences, Rowan University, 201 Mullica Hill Rd, Glassboro, NJ 08028, United States.
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3
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Rastogi P, Honecker D, Alba Venero D, Mahmoudi N, Kaisare NS, Basavaraj MG. Modulating shape transition in surfactant stabilized reverse microemulsions. SOFT MATTER 2023; 19:7033-7045. [PMID: 37681684 DOI: 10.1039/d3sm00682d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
The formation of reverse microemulsions (RMs) of spherical shape in the oil/water/surfactant ternary mixture at high molar ratio of water to surfactant (ω) is well established. Using dynamic light scattering, small-angle X-ray and neutron scattering, we elucidate the formation of non-spherical reverse microemulsions stabilised by sodium bis(2-ethylhexyl) sulfosuccinate (AOT) at ω = 10 and volume fractions of the dispersed phase, Φ, ranging from 0.005 to 0.20. In addition, we propose a strategy to tune the aspect ratio of non-spherical droplets and colloidal interactions by (i) varying the volume fraction of the dispersed phase (ii) changing the temperature, and (iii) by substituting the aliphatic oil with a mixture of aliphatic and aromatic hydrocarbons. This tunability of anisotropy along with a precise control of the interactions in the RMs, their ability to form spontaneously and their thermodynamic stability is crucial to provide a handle on reaction kinetics, synthesis of anisotropic nanoparticles as well as for their application as lubricants and viscosity modifiers.
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Affiliation(s)
- Preetika Rastogi
- Department of Chemical Engineering, Indian Institute of Technology, Madras, Chennai - 600036, Tamil Nadu, India.
| | - Dirk Honecker
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Diego Alba Venero
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Najet Mahmoudi
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Niket S Kaisare
- Department of Chemical Engineering, Indian Institute of Technology, Madras, Chennai - 600036, Tamil Nadu, India.
| | - Madivala G Basavaraj
- Department of Chemical Engineering, Indian Institute of Technology, Madras, Chennai - 600036, Tamil Nadu, India.
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4
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Pei Y, Ma J, Song F, Zhao Y, Li Z, Wang H, Wang J, Du R. Stable nanoreactors for material fabrication using the aggregation of fluorinated ionic liquid surfactants in ionic liquid solvents. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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5
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Preparation of water-in-oil (W/O) cinnamaldehyde microemulsion loaded with epsilon-polylysine and its antibacterial properties. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.101586] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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6
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Kim MG, Oh EJ, Jin KS, Chang JW, Lee HY. Effect of sugar alcohols on the reverse self-assembly of lecithin in diverse organic solvents. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115670] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Small-angle X-ray scattering as an effective tool to understand the structure and rigidity of the reverse micelles with the variation of surfactant. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Guo L, Fang YQ, Liang XR, Xu YY, Chen J, Li YH, Fang S, Meng YC. Influence of polysorbates (Tweens) on structural and antimicrobial properties for microemulsions. Int J Pharm 2020; 590:119939. [PMID: 33011247 DOI: 10.1016/j.ijpharm.2020.119939] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 08/28/2020] [Accepted: 09/27/2020] [Indexed: 11/17/2022]
Abstract
Polysorbates (Tweens) are one of the most used excipients for essential oils encapsulation. In this work, the polysorbate based microemulsions (PMEs) for R-(+)-limonene (LMN) encapsulation were investigated for the structural and antimicrobial properties. PMEs were constructed using the pseudoternary phase diagrams, and then characterized for electrical conductivity, rheology, size distribution and particle geometry. Conductivity and rheological measurement results showed that Tween 80 and Tween 60 based microemulsions have identical phase transitions. Dynamic light scattering demonstrated that hydrodynamic diameters of oil-in-water microemulsions decreased from 30 nm to 25 nm during the dilution, while small-angle X-ray scattering indicated that their spherical geometries were maintained. PMEs exhibited enhanced antimicrobial efficiencies in vitro against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. Interestingly, when Tween 80 was replaced by Tween 60, PME was observed more effective against S. aureus. The two PMEs structural analogues exhibited different antimicrobial efficiencies corresponding to the bioactivity of polysorbates. In conclusion, PMEs can be considered as a desirable system for LMN encapsulation to enhance its solubility and antimicrobial efficiency. Furthermore, the difference in the antimicrobial efficiency suggested that the choice of emulsifiers should be concerned to improve further applications.
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Affiliation(s)
- Liang Guo
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China
| | - Ya-Qian Fang
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China
| | - Xian-Rui Liang
- College of Pharmacy, Zhejiang University of Technology, Hangzhou 310018, PR China
| | - Yu-Yan Xu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China
| | - Jie Chen
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China
| | - Yan-Hua Li
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China
| | - Sheng Fang
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China
| | - Yue-Cheng Meng
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, PR China.
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9
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Wu Z, Zhao C, Huang Y, Ye F, Zhao G. Molecular mechanism underlying the effects of temperature and pH on the size and surface charge of octenylsuccinated oat β-glucan aggregates. Carbohydr Polym 2020; 237:116115. [PMID: 32241455 DOI: 10.1016/j.carbpol.2020.116115] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 02/06/2020] [Accepted: 03/02/2020] [Indexed: 02/02/2023]
Abstract
Environmental temperature and pH induced significant changes in the size and surface charge (ζ) of octenylsuccinated oat β-glucan aggregates. The underlying mechanisms were explored by using 1H-NMR, fluorescence spectra, thermodynamic analysis, and SAXS. At pH 6.5, the size decreased with temperature while ζ continuously increased. With increasing pH at 293 K, parabolic and U-shaped trends were observed in the size and ζ, peaking at pH 8.5 and 6.5, respectively. At any tested pH, the size decreased with temperature. Overall, ζ significantly increased with temperature at each pH. As temperature increased, the compactness of hydrophobic-domains increased while the compactness of hydrophilic-domains decreased. In an acidic environment, both the compactness increased with decreasing pH, but in an alkaline environment, they decreased with pH. The compactness changes were co-driven by enthalpy and entropy and corresponded to changes in the hydrophobic interactions in hydrophobic-domains, hydrogen bonds in hydrophilic-domains and electrostatic repulsions among octenylsuccinate molecules.
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Affiliation(s)
- Zhen Wu
- College of Food Science, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Chinese Medicine & Health Science, Chongqing Academy of Chinese Materia Medica, Chongqing, 400065, PR China
| | - Chenyang Zhao
- College of Food Science, Southwest University, Chongqing, 400715, PR China
| | - Yongxia Huang
- College of Food Science, Southwest University, Chongqing, 400715, PR China
| | - Fayin Ye
- College of Food Science, Southwest University, Chongqing, 400715, PR China
| | - Guohua Zhao
- College of Food Science, Southwest University, Chongqing, 400715, PR China; Chongqing Engineering Research Center of Regional Foods, Chongqing, 400715, PR China.
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10
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Penttilä PA, Vierros S, Utriainen K, Carl N, Rautkari L, Sammalkorpi M, Österberg M. Phospholipid-Based Reverse Micelle Structures in Vegetable Oil Modified by Water Content, Free Fatty Acid, and Temperature. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:8373-8382. [PMID: 31141381 PMCID: PMC6750831 DOI: 10.1021/acs.langmuir.9b01135] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Colloidal assemblies of phospholipids in oil are known to be highly sensitive to changes in system composition and temperature. Despite the fundamental biological and high industrial relevance of these aggregates, the mechanisms behind the structural changes, especially in real oils, are not well understood. In this work, small-angle X-ray scattering (SAXS) was combined with molecular dynamics simulations to characterize the effects of oleic acid, water, and temperature on self-assembled structures formed by lecithin in rapeseed oil. SAXS showed that adding water to the mixtures caused the precipitation of liquid-crystalline phases with lamellar or hexagonal geometry. The combination of SAXS and molecular dynamics simulations revealed that stable spherical reverse micelles in oil had a core radius of about 2 nm and consisted of approximately 60 phospholipids centered around a core containing water and sugars. The presence of oleic acid improved the stability of reverse micelles against precipitation due to the increase in the water concentration in oil by allowing the reverse micelle cores to expand and accommodate more water. The shape and size of the reverse micelles changed at high temperatures, and irreversible elongation was observed, especially in the presence of oleic acid. The findings show the interdependency of the structure of the reverse micellar aggregates on system composition, in particular, oleic acid and water, as well as temperature. The revealed characteristics of the self-assembled structures have significance in understanding and tuning the properties of vegetable oil-based emulsions, food products, oil purification, and drug delivery systems.
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Affiliation(s)
- Paavo A. Penttilä
- Department
of Bioproducts and Biosystems and Department of Chemistry and Materials
Science, Aalto University, P.O. Box 16300, FI-00076 Espoo, Finland
- Large-Scale
Structures Group, Institut Laue-Langevin, 71 Avenue des Martyrs, F-38000 Grenoble, France
- E-mail: . Phone: +358 (0)50 476 6800
| | - Sampsa Vierros
- Department
of Bioproducts and Biosystems and Department of Chemistry and Materials
Science, Aalto University, P.O. Box 16300, FI-00076 Espoo, Finland
| | - Katja Utriainen
- Department
of Bioproducts and Biosystems and Department of Chemistry and Materials
Science, Aalto University, P.O. Box 16300, FI-00076 Espoo, Finland
| | - Nico Carl
- Large-Scale
Structures Group, Institut Laue-Langevin, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - Lauri Rautkari
- Department
of Bioproducts and Biosystems and Department of Chemistry and Materials
Science, Aalto University, P.O. Box 16300, FI-00076 Espoo, Finland
| | - Maria Sammalkorpi
- Department
of Bioproducts and Biosystems and Department of Chemistry and Materials
Science, Aalto University, P.O. Box 16300, FI-00076 Espoo, Finland
| | - Monika Österberg
- Department
of Bioproducts and Biosystems and Department of Chemistry and Materials
Science, Aalto University, P.O. Box 16300, FI-00076 Espoo, Finland
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11
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Fabozzi A, Russo Krauss I, Vitiello R, Fornasier M, Sicignano L, King S, Guido S, Jones C, Paduano L, Murgia S, D'Errico G. Branched alkyldimethylamine oxide surfactants: An effective strategy for the design of high concentration/low viscosity surfactant formulations. J Colloid Interface Sci 2019; 552:448-463. [PMID: 31151022 DOI: 10.1016/j.jcis.2019.05.052] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/16/2019] [Accepted: 05/17/2019] [Indexed: 10/26/2022]
Abstract
HYPOTHESIS The rational design of branched-tail surfactants is a suitable strategy to obtain low-viscosity surfactant-rich isotropic aqueous mixtures with negligible effects on biodegradability. This opens a way to the design of concentrated ("water-free") surfactant formulations, highly attractive for their ecological and economic benefits. EXPERIMENTS The aggregation behaviour of N,N-dimethyl-2-propylheptan-1-amine oxide (C10DAO-branched) in aqueous mixtures is investigated across the entire composition range by polarized optical microscopy, small angle X-ray and neutron scattering, electron paramagnetic resonance, and pulse-gradient stimulated echo nuclear magnetic resonance. The humidity scanning quartz crystal microbalance with dissipation monitoring technique is validated as a tool for the fast screening of surfactants phase behaviour. Furthermore, the shear viscosities and viscoelastic moduli of the systems are determined by rheological measurements. FINDINGS With respect to the linear isomer, C10DAO-branched presents a much lower tendency to form lyotropic liquid crystalline phases. Except for a narrow composition and temperature range in which a lamellar structure is observed, C10DAO-branched aqueous mixtures are isotropic liquids whose microstructure changes, with increasing concentration, from micellar solutions to unstructured dispersions of hydrated surfactant molecules. Low-viscosity was found for all these mixtures, including the most concentrated ones. Thus, the introduction of a single short side-chain in the tail is demonstrated to be an effective approach to increase the active concentration in surfactant formulations.
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Affiliation(s)
- Antonio Fabozzi
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, Complesso Universitario di Monte Sant'Angelo, I-80126 Naples, Italy
| | - Irene Russo Krauss
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, Complesso Universitario di Monte Sant'Angelo, I-80126 Naples, Italy; CSGI, Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase, Via della Lastruccia 3, I-50019 Sesto Fiorentino, Florence, Italy
| | - Rosa Vitiello
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, Complesso Universitario di Monte Sant'Angelo, I-80126 Naples, Italy
| | - Marco Fornasier
- Department of Chemical and Geological Sciences, University of Cagliari, s.s. 554 bivio Sestu, Monserrato, CA I-09042, Italy
| | - Luca Sicignano
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le V. Tecchio 80, I-80125 Naples, Italy
| | - Stephen King
- ISIS Pulsed Neutron & Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, United Kingdom
| | - Stefano Guido
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le V. Tecchio 80, I-80125 Naples, Italy
| | - Christopher Jones
- Procter & Gamble Innovation Centre, Strombeek-Bever Temseelan 100, B-1853, Brussels, Belgium
| | - Luigi Paduano
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, Complesso Universitario di Monte Sant'Angelo, I-80126 Naples, Italy; CSGI, Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase, Via della Lastruccia 3, I-50019 Sesto Fiorentino, Florence, Italy
| | - Sergio Murgia
- CSGI, Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase, Via della Lastruccia 3, I-50019 Sesto Fiorentino, Florence, Italy; Department of Chemical and Geological Sciences, University of Cagliari, s.s. 554 bivio Sestu, Monserrato, CA I-09042, Italy.
| | - Gerardino D'Errico
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, Complesso Universitario di Monte Sant'Angelo, I-80126 Naples, Italy; CSGI, Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase, Via della Lastruccia 3, I-50019 Sesto Fiorentino, Florence, Italy.
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12
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Luo Y, Hu H, Wang Y, Hu F, Zhu S, Zhang S, Zhang Y, Li S, Wang J. Phase separation in solvent extraction of copper or nickel from acidic solution using a sulfonic acid (HDNNS) and a carboxylate ester (4PC). J DISPER SCI TECHNOL 2018. [DOI: 10.1080/01932691.2018.1485576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Yuqing Luo
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
- Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, China
| | - Huiping Hu
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
- Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, China
| | - Yongxi Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
- Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, China
| | - Fang Hu
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
- Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, China
| | - Shan Zhu
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
- Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, China
| | - Shuaifei Zhang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
- Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, China
| | - Ying Zhang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
- Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, China
| | - Shengkang Li
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
- Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, China
| | - Junya Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
- Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, China
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13
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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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Aramaki K, Iwata C, Mata J, Maehara T, Aburano D, Sakanishi Y, Kitao K. One-step formulation of nonionic surfactant bicelles (NSBs) by a double-tailed polyglycerol-type nonionic surfactant. Phys Chem Chem Phys 2017; 19:23802-23808. [PMID: 28530285 DOI: 10.1039/c7cp02585h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bicelles are generally formed by phospholipid-based systems and are useful for various applications, such as nanocarriers or membrane protein crystallization. The same disc-like assemblies, nonionic surfactant bicelles (NSBs), can also be formed using nonionic amphiphiles, but this has not been reported extensively. We report a novel NSB system that employs the double-tailed nonionic amphiphile, polyglyceryl dialkyl ether (C12CmGn), which has two alkyl chains and a polyglyceryl group. A symmetric-tail molecule, C12C12G13.8, formed vesicles, whereas an asymmetric-tail molecule, C12C14G15.5, formed NSBs through a simple one-step process using ultrasonication. The 1 wt% aqueous solution of C12C14G15.5 was in a two-phase equilibrium of a lamellar phase and a water phase. Transparent dispersion was obtained through ultrasonication treatment. The size distribution in the dispersion was obtained by dynamic light scattering (DLS), resulting in a narrow distribution of around 20 nm in diameter. A negatively-stained transmission electron microscopy (TEM) image showed oblong and spherical shapes, which are typically observed in bicelle-forming systems. A small angle neutron scattering (SANS) measurement well proved bicelle formation by fitting a core-shell bicelle form factor model. The disc thickness and diameter were in agreement with the values obtained by DLS and TEM, respectively. A larger shell thickness at the rim part than at the flat disc part suggested that NSB aggregates have inhomogeneous molecular distribution. Similar to phospholipid systems, the bicelle-forming C12C14G15.5 system produced a defective lamellar phase formation at high surfactant concentrations, whereas a general lamellar phase was formed in the vesicle-forming C12C12G13.8 system.
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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.
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Ellis RJ. Acid-switched Eu(III) coordination inside reverse aggregates: Insights into a synergistic liquid-liquid extraction system. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.08.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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16
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Michor EL, Ponto BS, Berg JC. Effects of Reverse Micellar Structure on the Particle Charging Capabilities of the Span Surfactant Series. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10328-10333. [PMID: 27649769 DOI: 10.1021/acs.langmuir.6b02959] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This paper investigates the effects of reverse micellar core size on the particle charging behavior of a series of acidic surfactants in apolar media. A series of Span surfactants was dissolved in deuterated decane at concentrations above the critical micelle concentration. The structures of the reverse micelles were measured using small-angle neutron scattering. It was determined that as the tail length of the surfactant increased, the size of the polar reverse micellar core decreased. Tritailed surfactants formed reverse micelles with the smallest polar cores, with radii of ∼4 Å. The sizes of the polar cores were correlated with the particle charging behavior of the Span surfactant series, as measured in a previous study. It was found that reverse micelles with intermediate core sizes imparted the largest electrophoretic mobilities to the particles. Reverse micelles with very small cores did not offer a large enough polar environment to favor charge stabilization, while very large polar cores favored disproportionation reactions in the bulk, resulting in increased electrostatic screening.
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Affiliation(s)
- Edward L Michor
- Department of Chemical Engineering, University of Washington , Box 351750, Seattle, Washington 98195-1750, United States
| | - Benjamin S Ponto
- Department of Chemical Engineering, University of Washington , Box 351750, Seattle, Washington 98195-1750, United States
| | - John C Berg
- Department of Chemical Engineering, University of Washington , Box 351750, Seattle, Washington 98195-1750, United States
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18
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Structural features and surfactant properties of core–shell type micellar aggregates formed by gemini piperidinium surfactants. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2015.11.073] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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Aramaki K, Yamada J, Tsukijima Y, Maehara T, Aburano D, Sakanishi Y, Kitao K. Formation of bilayer membrane and niosomes by double-tailed polyglyceryl-type nonionic surfactant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10664-10671. [PMID: 26355349 DOI: 10.1021/acs.langmuir.5b02454] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Vesicles with synthetic nonionic surfactants are called niosomes or NSVs, and these have been the focus of attention as an alternative to phospholipid liposomes as drug carriers. Especially it is demanded to discover novel niosomal systems with polyol-type nonionic surfactants from the viewpoint of environmental aspects. In this paper, a novel series of double-tailed nonionic surfactants, polyglyceryl dialkyl ethers, (C12)2Gn (n = 2.3, 5.4, 9.4, and 13.8), was synthesized, and its aqueous phase behavior and niosome formation were studied. Because of its double-tailed molecular structure, a lamellar liquid crystalline phase was dominant in the binary phase diagrams for different polyglyceryl chain lengths. The single lamellar liquid crystalline phase region was expanded as the polymerization degree in the hydrophilic moiety increased. Small-angle X-ray scattering spectra revealed the lamellar structure for the (C12)2G2.3 was extremely loose. Molecular packing in the lamellar phase was analyzed except for the (C12)2G2.3 system by using a geometrical model of the lamellar phase. The effective cross-sectional area per molecule at the interface increased extensively as dilution for the (C12)2G13.8 system but remained almost unchanged for the (C12)2G5.4 system. From the molecular parameters, water-holding ability in the lamellar phase was evaluated, and the results indicated strong hydration ability of the long polyglyceryl chain. In a dilute region, micron-sized giant niosomes and small niosomes of about 100 nm were formulated by vortex mixing and ultrasonication, respectively. The multilamellar structure of the small niosomes was confirmed by transmission electron microscopy. Cholesterol addition in the present surfactant lamellar phase induced the phase transition to the liquid ordered phase, which is the same phenomenon in a phospholipid-cholesterol mixture. The stability of niosomes with/without cholesterol was monitored by the niosome size change. In both cases, the niosomes were stable for at least 100 days.
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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
| | - Junya Yamada
- Graduate School of Environment and Information Sciences, Yokohama National University , Tokiwadai 79-7, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yoshitomo Tsukijima
- Graduate School of Environment and Information Sciences, Yokohama National University , Tokiwadai 79-7, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Tetsuya Maehara
- R&D Center, Organic Chemical Products Company, DAICEL Corporation , 1239 Shinzaike, Aboshi-ku, Himeji-shi, 671-1283, Japan
| | - Daisuke Aburano
- R&D Center, Organic Chemical Products Company, DAICEL Corporation , 1239 Shinzaike, Aboshi-ku, Himeji-shi, 671-1283, Japan
| | - Yuichi Sakanishi
- R&D Center, Organic Chemical Products Company, DAICEL Corporation , 1239 Shinzaike, Aboshi-ku, Himeji-shi, 671-1283, Japan
| | - Kyuhei Kitao
- R&D Center, Organic Chemical Products Company, DAICEL Corporation , 1239 Shinzaike, Aboshi-ku, Himeji-shi, 671-1283, Japan
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Ellis RJ, Meridiano Y, Muller J, Berthon L, Guilbaud P, Zorz N, Antonio MR, Demars T, Zemb T. Complexation-induced supramolecular assembly drives metal-ion extraction. Chemistry 2014; 20:12796-807. [PMID: 25169678 DOI: 10.1002/chem.201403859] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Indexed: 11/11/2022]
Abstract
Combining experiment with theory reveals the role of self-assembly and complexation in metal-ion transfer through the water-oil interface. The coordinating metal salt Eu(NO3)3 was extracted from water into oil by a lipophilic neutral amphiphile. Molecular dynamics simulations were coupled to experimental spectroscopic and X-ray scattering techniques to investigate how local coordination interactions between the metal ion and ligands in the organic phase combine with long-range interactions to produce spontaneous changes in the solvent microstructure. Extraction of the Eu(3+)-3(NO3(-)) ion pairs involves incorporation of the "hard" metal complex into the core of "soft" aggregates. This seeds the formation of reverse micelles that draw the water and "free" amphiphile into nanoscale hydrophilic domains. The reverse micelles interact through attractive van der Waals interactions and coalesce into rod-shaped polynuclear Eu(III) -containing aggregates with metal centers bridged by nitrate. These preorganized hydrophilic domains, containing high densities of O-donor ligands and anions, provide improved Eu(III) solvation environments that help drive interfacial transfer, as is reflected by the increasing Eu(III) partitioning ratios (oil/aqueous) despite the organic phase approaching saturation. For the first time, this multiscale approach links metal-ion coordination with nanoscale structure to reveal the free-energy balance that drives the phase transfer of neutral metal salts.
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Affiliation(s)
- Ross J Ellis
- Chemical Sciences & Engineering Division Argonne, National Laboratory, Argonne, IL, 60439 (USA).
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Ellis RJ. Critical Exponents for Solvent Extraction Resolved Using SAXS. J Phys Chem B 2013; 118:315-22. [DOI: 10.1021/jp408078v] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ross J. Ellis
- Chemical Sciences and Engineering
Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
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Abstract
We report shape, size, and internal cross-sectional structure of diglycerol monomyristate (C₁₄G₂) reverse micelles in n-hexadecane near the critical point using small-angle X-ray scattering (SAXS). Pair-distance distribution function, p(r), which gives structural information in real-space, was obtained by indirect Fourier transformation (IFT) method. The p(r) showed a clear picture of rodlike micelles at higher temperatures well above the critical point (micellar solution phase separates into two immiscible liquids at ~ 48°C). At a fixed surfactant concentration (5% C₁₄G₂), decrease in temperature increases the micellar size monotonously and surprisingly shape of the p(r) curve at 50°C; close to the critical point, mimics the shape of the two dimensional disk-like micelles indicating the onset of critical fluctuations (attractive interactions among rodlike micelles forming a weak network). A similar behavior has been observed with normal micelles in aqueous system near the critical point. When the system is heated to 60°C, shape of the p(r) curve regains rodlike structure. At fixed temperature of 60°C, increase in C₁₄G₂ concentration induced one dimensional micellar growth. Maximum length of micelles increases from ca. 23.5 to 46.0 nm upon increasing concentration from 1 to 12% keeping cross section diameter apparently unchanged at ca. 4.0 nm.
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Affiliation(s)
- Lok Kumar Shrestha
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS)
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Ellis RJ, Anderson TL, Antonio MR, Braatz A, Nilsson M. A SAXS study of aggregation in the synergistic TBP-HDBP solvent extraction system. J Phys Chem B 2013; 117:5916-24. [PMID: 23647100 DOI: 10.1021/jp401025e] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The macroscopic phase behaviors of a solvent system containing two extractants, tri-n-butyl phosphate (TBP) and di-n-butyl phosphoric acid (HDBP) in n-dodecane, were investigated through use of liquid-liquid extraction and small-angle X-ray scattering (SAXS) experiments. Five organic solutions, each containing a total extractant concentration (TBP + HDBP) of 1 M in varying molar ratios (0, 0.25, 0.5, 0.75, and 1.0 [TBP]:[TBP + HDBP]), were contacted with 0.2 M HNO3 aqueous solutions without and with dysprosium(III) at a concentration of 10(-4) M. An enhancement of the extraction of Dy(3+)--due to effects of synergism arising from the binary combination of extractants--was observed. SAXS data were collected for all solution compositions from 0 to 1 mol-fraction end ratios of TBP after contact with the acidic aqueous solutions both in the absence and presence of Dy as well as for the organic phases before aqueous contact. In the precontacted solutions, no notable changes in the SAXS data were observed upon combining the extractants so that the scattering intensity (I) measured at zero angle (Q = 0 Å(-1))--parameter I(0)--the experimental radius of gyration (R(g)), and the maximum linear extent (MLE) of the extractant aggregates were arithmetic averages of the two end members, 1 M HDBP, on the one hand, and 1 M TBP, on the other. In contrast, after contact with the aqueous phases with and without Dy(3+), a significant reorganization occurs with larger aggregates apparent in the extractant mixtures and smaller in the two end member solutions. In particular, the maximum values of the metrical parameters (I(0), R(g), and MLE) correlate with the apparent optimal synergistic extraction mole ratio of 0.25. The SAXS data were further analyzed using the recently developed generalized indirect Fourier transformation (GIFT) method to provide pair-distance distribution functions with real-space information on aggregate morphology. Before aqueous contact, the organic phases show a systematically varying response from globular-like reverse micelles in the case of 1 M TBP to rod-shaped architectures in the case of 1 M HDBP. After aqueous contact, the aggregate morphologies of the mixed extractant systems are not simple linear combinations of those for the two end members. Rather, they have larger and more elongated structures, showing sharp discontinuities in the metrics of the aggregate entities that are coincident with the synergistic extraction mixture for Dy(3+). The results in this initial study suggest a supramolecular, micellization aspect to synergism that remains underexplored and warrants further investigation, especially as it concerns the contemporary relevance to decades-old process chemistry and practices for high throughput separations systems.
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Affiliation(s)
- Ross J Ellis
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-4831, USA.
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25
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Njauw CW, Cheng CY, Ivanov VA, Khokhlov AR, Tung SH. Molecular interactions between lecithin and bile salts/acids in oils and their effects on reverse micellization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:3879-88. [PMID: 23441904 DOI: 10.1021/la304601p] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
It has been known that the addition of bile salts to lecithin organosols induces the formation of reverse wormlike micelles and that the worms are similar to long polymer chains that entangle each other to form viscoelastic solutions. In this study, we further investigated the effects of different bile salts and bile acids on the growth of lecithin reverse worms in cyclohexane and n-decane. We utilized rheological and small-angle scattering techniques to analyze the properties and structures of the reverse micelles. All of the bile salts can transform the originally spherical lecithin reverse micelles into wormlike micelles and their rheological behaviors can be described by the single-relaxation-time Maxwell model. However, their efficiencies to induce the worms are different. In contrast, before phase separation, bile acids can induce only short cylindrical micelles that are not long enough to impart viscoelasticity. We used Fourier transform infrared spectroscopy to investigate the interactions between lecithin and bile salts/acids and found that different bile salts/acids employ different functional groups to form hydrogen bonds with lecithin. Such effects determine the relative positions of the bile salts/acids in the headgroups of lecithin, thus resulting in varying efficiencies to alter the effective critical packing parameter for the formation of wormlike micelles. This work highlights the importance of intermolecular interactions in molecular self-assembly.
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Affiliation(s)
- Ching-Wei Njauw
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan
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26
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Periodic Behavior of Lanthanide Coordination within Reverse Micelles. Chemistry 2013; 19:2663-75. [DOI: 10.1002/chem.201202880] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Indexed: 11/07/2022]
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Ramanathan M, Shrestha LK, Mori T, Ji Q, Hill JP, Ariga K. Amphiphile nanoarchitectonics: from basic physical chemistry to advanced applications. Phys Chem Chem Phys 2013; 15:10580-611. [DOI: 10.1039/c3cp50620g] [Citation(s) in RCA: 271] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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28
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Towards detergency in liquid CO2 – A surfactant formulation for particle release in an apolar medium. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.10.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Ellis RJ, Audras M, Antonio MR. Mesoscopic aspects of phase transitions in a solvent extraction system. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:15498-15504. [PMID: 23062174 DOI: 10.1021/la3034879] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In liquid-liquid extraction, organic phase splitting arises when high concentrations of polar solutes (acids/metal ions) are extracted. Herein, we investigate the mesoscopic roots that underpin phase splitting in alkane phases containing mixed amphiphiles, of contemporary interest in solvent extraction separation systems, by extracting various oxoacids. The oxoacids exhibited individual macroscopic (extractive and physical) behaviors, inducing phase splitting into heavy and light domains under markedly different conditions. Using small-angle X-ray scattering (SAXS) data analyzed using the generalized indirect Fourier transform (GIFT) method, we showed that, in all cases, acid extraction drove the self-assembly of reverse micelles into rods. These grew with increased acid extraction until reaching a critical length of 20 nm, at which point interactions produced interconnected cylinders or lamellar sheets that prelude phase splitting into heavy and light domains. In all cases, the heavy phase contained the same surfactant ratio-TBP (tri-n-butyl phosphate) and CMPO (octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide)-even though the concentrations of acid, water, and amphiphiles were markedly different. The remarkable similarities in structure and amphiphile stoichiometries underpinning phase splitting across the macroscopically different acid extraction series allude to the mesoscopic roots of organic phase behavior in solvent extraction. Our studies show that the structures underpinning phase splitting in solvent extraction systems are more complex than previously thought and are reminiscent of phase transitions in soft matter.
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Affiliation(s)
- Ross J Ellis
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Illinois 60439, United States.
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Shrestha LK, Shrestha RG, Aramaki K, Hill JP, Ariga K. Nonionic reverse micelle formulation and their microstructure transformations in an aromatic solvent ethylbenzene. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.08.039] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Correa NM, Silber JJ, Riter RE, Levinger NE. Nonaqueous Polar Solvents in Reverse Micelle Systems. Chem Rev 2012; 112:4569-602. [DOI: 10.1021/cr200254q] [Citation(s) in RCA: 204] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- N. Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia
Postal #3, C.P. X5804BYA Río Cuarto, Argentina
| | - Juana J. Silber
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia
Postal #3, C.P. X5804BYA Río Cuarto, Argentina
| | - Ruth E. Riter
- Department of Chemistry, Agnes Scott College, Decatur, Georgia 30030-3770, United
States
| | - Nancy E. Levinger
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
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Ellis RJ, Antonio MR. Coordination structures and supramolecular architectures in a cerium(III)-malonamide solvent extraction system. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:5987-5998. [PMID: 22420768 DOI: 10.1021/la3002916] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The process chemistry and solution structures investigated in the title system bridge the three ostensibly disparate fields of separation sciences, soft matter research, and coordination chemistry. We have explored this subject with synchrotron radiation research and advanced analyses leading to original insights into aggregation phenomena in solvent extraction. Herein we present findings showing the coagulation of reverse micelles into wormlike aggregates in organic phases (N,N'-dimethyl-N,N'-dibutyltetradecylmalonamide-abbreviated as DMDBTDMA-in n-dodecane) obtained by liquid-liquid extraction following contact with acidic and neutral aqueous media containing trivalent cerium. The growth of solute architectures was shown to prelude phase transition (i.e., the formation of a "third phase"). The presence of acid was shown to promote the growth of these micellar chains and, therefore, promoted third-phase formation. Acid was also shown to hydrate and swell the reverse micelle units, preorganizing them to allow for incorporation of cerium, leading to different coordination structures and enhanced metal extraction. The approach of linking both the coordination environment and supramolecular structures to the process properties of a solvent extraction system in a single study provides perspectives that are not available from independent, uncorrelated experimentation. Moreover, the analysis of small-angle X-ray scattering data from a solvent extraction system using the generalized indirect Fourier transform method to gain real-space information led to insights not otherwise available, showing that micellar assemblies are larger and more ordered than previously thought. This multipronged and multidisciplinary investigation opens new avenues in the evolving understanding of solute architectures in organic phases of practical relevance to solvent extraction and, simultaneously, of fundamental relevance to structured fluids and, in particular, phase transition phenomena.
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Affiliation(s)
- Ross J Ellis
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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Shrestha RG, Shrestha LK, Aramaki K, Abe M. SAXS and rheometry studies of diglycerol monolurate reverse micelles in styrene. J Oleo Sci 2011; 60:393-401. [PMID: 21768740 DOI: 10.5650/jos.60.393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We have investigated the structure and rheology of diglycerol monolaurate (C(12)G(2)) reverse micelles in styrene using small-angle X-ray scattering (SAXS) and rheometry techniques. The SAXS data have been evaluated by generalized indirect Fourier transformation (GIFT) method and further supported by geometrical model fittings. We found that the C(12)G(2) when added into styrene spontaneously self-assemble into ellipsoidal prolate type reverse micelles under ambient conditions. Micelles grew and micellar aggregation number (N(agg)) increased with the increase in surfactant concentration demonstrating concentration induced one dimensional micellar growth, which was further supported by rheology data; the relative viscosity, η(r), for the C(12)G(2)/styrene mixtures exhibit far steeper concentration dependence behavior than those predicted for a dispersion of spherical particles based on the Krieger-Dougherty relation, due to the elongated micellar structures. On the other hand, a distinct modulation in the shape and size of micelles favoring ellipsoidal prolate-to-sphere type transition was observed upon heating, whose scheme could be attributed to the enhanced penetration tendency of oil into the lipophilic shell of the surfactant at the higher temperatures. As anticipated reverse micelles swelled with water causing two dimensional micellar growth; both the maximum dimension and maximum core radius increase with water.
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Affiliation(s)
- Rekha Goswami Shrestha
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba, Japan
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