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Ginesi RE, Draper ER. Methods of changing low molecular weight gel properties through gelation kinetics. SOFT MATTER 2024; 20:3887-3896. [PMID: 38691131 DOI: 10.1039/d4sm00238e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
Low molecular weight gels continue to attract notable interest, with many potential applications. However, there are still significant gaps in our understanding of these systems and the correlation between the pre-gel and final gel states. The kinetics of the gelation process plays a crucial role in the bulk properties of the hydrogel and presents an opportunity to fine-tune these systems to meet the requirements of the chosen application. Therefore, it is possible to use a single gelator for multiple applications. This review discusses four ways to modify the pre-gelled structures before triggering gelation. Such modifications can enhance the material's intended performance, which may result in significant advancements in high-tech areas, such as drug delivery, cell culturing, electronics, and tissue engineering.
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Affiliation(s)
- Rebecca E Ginesi
- School of Chemistry, University of Glasgow, Glasgow, UK, G12 8QQ, UK.
| | - Emily R Draper
- School of Chemistry, University of Glasgow, Glasgow, UK, G12 8QQ, UK.
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2
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Rezaie A, Ghasemi H, Eslami F. An in-depth investigation of the impact of salt nature on the formulation of microemulsion systems. Sci Rep 2023; 13:14362. [PMID: 37658147 PMCID: PMC10474266 DOI: 10.1038/s41598-023-40761-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 08/16/2023] [Indexed: 09/03/2023] Open
Abstract
Electrolytes have a wide range of technological applications. Despite the recent improvements in characterizing and predicting the phase behavior of microemulsion systems by hydrophilic-lipophilic deviation (HLD) and net-average curvature (NAC) frameworks, they are ineffective in the presence of different salts. This work seeks to bridge this gap by investigating the influence of salt nature on the microemulsion phase formulation. First, a one-dimensional salinity scan on different microemulsion systems consisting of sodium dodecyl benzene sulfonate as a surfactant, hexane as an oil and, several brines was carried out, and the effect of each salt on the phase behavior were precisely evaluated. The results for optimum salinity and solubilization parameter of different salts were consistent with the Hofmeister series. In addition, multiple linear regression model is presented to accurately predicting the optimum salinity of different salts using this research data and all the available experimental data. The results revealed that the values estimated by this model is in significant consistency with the experimental data by correlation coefficient of 0.92. Finally, the effect of salt type on the NAC parameters (length parameter, and characteristic length[Formula: see text] were evaluated to improve the predicting ability of this equation of state in the presence of various salts. We found that salt nature has a significant impact on both these parameters. It was found that the length parameter is linearly dependent on the optimum ionic strength of salts while the salting-out capacity of each salt was predominant factor affecting the characteristic length.
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Affiliation(s)
- Ali Rezaie
- Department of Chemical Engineering, Tarbiat Modares University, Jalal Al Ahmad HWY, P.O. Box: 14115-111, Tehran, Iran
| | - Hassan Ghasemi
- Department of Chemical Engineering, Tarbiat Modares University, Jalal Al Ahmad HWY, P.O. Box: 14115-111, Tehran, Iran
| | - Fatemeh Eslami
- Department of Chemical Engineering, Tarbiat Modares University, Jalal Al Ahmad HWY, P.O. Box: 14115-111, Tehran, Iran.
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3
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Sun Q, Gong J, Sun Y, Song Y, Liu C, Xu B. The Spontaneous Vesicle-Micelle Transition in a Catanionic Surfactant System: A Chemical Trapping Study. Molecules 2023; 28:6062. [PMID: 37630313 PMCID: PMC10457922 DOI: 10.3390/molecules28166062] [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: 07/18/2023] [Revised: 08/10/2023] [Accepted: 08/12/2023] [Indexed: 08/27/2023] Open
Abstract
Typically, the formation of vesicles requires the addition of salts or other additives to surfactant micelles. However, in the case of catanionic surfactants, unilamellar vesicles can spontaneously form upon dilution of the micellar solutions. Our study explores the intriguing spontaneous vesicle-to-micelle transition in catanionic surfactant systems, specifically cetyltrimethyl ammonium bromide (CTAB) and sodium octylsulfonate (SOS). To gain insights into the changes occurring at the interface, we employ a chemical trapping method to characterize variations in the molarities of sulfonate headgroups, water, and bromide ions during the transition. Our findings reveal the formation of ion pairs between the cationic component of CTAB and the anionic component of SOS, leading to tight interfacial packing in CTAB/SOS solutions. This interfacial packing promotes vesicle formation at low surfactant concentrations. Due to the significant difference in critical micelle concentration (cmc) between CTAB and SOS, an increase in the stoichiometric surfactant concentration results in a substantial rise in the SOS-to-CTAB ratio within the interfacial region. This enrichment of SOS in the aggregates triggers the transition from vesicles to micelles. Overall, our study may shed new light on the design of morphologies in catanionic and other surfactant systems.
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Affiliation(s)
| | | | | | | | - Changyao Liu
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, China; (Q.S.); (J.G.); (Y.S.); (Y.S.); (B.X.)
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4
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Gong J, Yao K, Sun Q, Sun Y, Sun L, Liu C, Xu B, Tan J, Zhao L, Xu B. Interfacial Composition of Surfactant Aggregates in the Presence of Fragrance: A Chemical Trapping Study. Molecules 2022; 27:molecules27144333. [PMID: 35889205 PMCID: PMC9320350 DOI: 10.3390/molecules27144333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/04/2022] [Accepted: 07/04/2022] [Indexed: 12/02/2022] Open
Abstract
In recent years, there has been increasing interest in daily-use chemical products providing a pleasant scent. The added fragrance molecules may induce microstructural transitions of surfactant aggregates, which further affect the physical and chemical properties of the products. Here, the effects of four types of aromatic alcohols (cinnamyl alcohol, phenyl ethanol, phenyl methanol and anisyl alcohol) on cetyltrimethylammonium bromide (CTAB)/KBr aggregates were studied. The combined results from rheology, dynamic light scattering, and transmission electron microscopy measurements showed that cinnamyl alcohol induced significant micellar growth, while increases in micellar growth were less obvious for the other aromatic alcohols. The changes in the interfacial molarities of water, aromatic alcohol, and bromide ions during such transitions were studied using the chemical trapping method. Transitions resulting from added cinnamyl alcohol were accompanied by significant declines in interfacial water and bromide ion molarities, and a rise in interfacial alcohol molarity. The marked decrease in interfacial water molarity was not observed in previous studies of the octanol induced formation of wormlike micelles and vesicles, indicating that a different mechanism was presented in the current system. Nuclear magnetic resonance investigation showed that π–π stacking between cinnamyl alcohols, but not cation–π interactions between alcohols and CTAB headgroups, facilitated the tight packing of alcohol molecules in CTAB aggregates and the repulsion of water from the interfacial region. The current study may provide a theoretical basis for the morphological regulation of surfactant aggregates in the presence of additives.
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Affiliation(s)
- Jiani Gong
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, China; (J.G.); (K.Y.); (Q.S.); (Y.S.); (L.S.); (L.Z.); (B.X.)
| | - Kaixin Yao
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, China; (J.G.); (K.Y.); (Q.S.); (Y.S.); (L.S.); (L.Z.); (B.X.)
| | - Qihan Sun
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, China; (J.G.); (K.Y.); (Q.S.); (Y.S.); (L.S.); (L.Z.); (B.X.)
| | - Yujia Sun
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, China; (J.G.); (K.Y.); (Q.S.); (Y.S.); (L.S.); (L.Z.); (B.X.)
| | - Lijie Sun
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, China; (J.G.); (K.Y.); (Q.S.); (Y.S.); (L.S.); (L.Z.); (B.X.)
| | - Changyao Liu
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, China; (J.G.); (K.Y.); (Q.S.); (Y.S.); (L.S.); (L.Z.); (B.X.)
- Correspondence: (C.L.); (B.X.)
| | - Bo Xu
- McIntire School of Commerce, University of Virginia, Charlottesville, VA 22903, USA
- Correspondence: (C.L.); (B.X.)
| | - Jiajing Tan
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China;
| | - Li Zhao
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, China; (J.G.); (K.Y.); (Q.S.); (Y.S.); (L.S.); (L.Z.); (B.X.)
| | - Baocai Xu
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, China; (J.G.); (K.Y.); (Q.S.); (Y.S.); (L.S.); (L.Z.); (B.X.)
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5
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Sun L, Gong J, Xu B, Wang Y, Ding X, Zhang Y, Liu C, Zhao L, Xu B. Ion-Specific Effects on Vesicle-to-Micelle Transitions of an Amino Acid Surfactant Probed by Chemical Trapping. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6295-6304. [PMID: 35476409 DOI: 10.1021/acs.langmuir.1c03415] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Ion-specific effects widely exist in biological and chemical systems and cannot be explained by classical theories. The complexity of ion-specific effects in protein systems at the molecular level necessitates the use of mimetic models involving smaller molecules, such as amino acids, oligopeptides, and other organic molecules bearing amide bonds. Therefore, it is of theoretical value to determine the effect of additional salts on the aggregation transitions of acyl amino acid surfactants. Herein, the effects of specific tetraalkylammonium ions (TAA+) on sodium lauroyl glycinate (SLG) aggregation were studied by dynamic light scattering (DLS) and transmission electron microscopy. Although previous studies have shown that the kosmotropic TAA+ ions tend to induce micellar growth or micelle-to-vesicle transitions of some anionic surfactants, TAA+ addition in the present study induced partial vesicle-to-micelle transitions in SLG solutions. The chemical trapping (CT) method was employed to estimate changes in the interfacial molarities of water, amide bonds, and carboxylate groups during such transitions. The vesicle-to-micelle transitions were accompanied by a marked rise in interfacial water molarity and a decline in interfacial amide bonds molarity, suggesting that the hydrated TAA+ entered the interfacial region and disrupted hydrogen bonding, thus preventing the SLG monomers from packing tightly. Molecular dynamic simulation was also performed to demonstrate the salt-induced cleavage of amide-amide bonds between SLG headgroups. Furthermore, both CT and DLS results show that the ability of tetraalkylammonium cations to induce such transitions increased with increasing size and hydrophobicity of the cation, which follows the Hofmeister series. The current study offers critical molecular-level evidence for understanding the specific effects of tetraalkylammonium ions on the aggregation transitions of an acyl amino acid surfactant.
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Affiliation(s)
- Lijie Sun
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, People's Republic of China
| | - Jiani Gong
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, People's Republic of China
| | - Bo Xu
- McIntire School of Commerce, University of Virginia, Charlottesville, Virginia 22903, United States
| | - Yuzhao Wang
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, People's Republic of China
| | - Xiaoxuan Ding
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, People's Republic of China
| | - Yongliang Zhang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854, United States
| | - Changyao Liu
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, People's Republic of China
| | - Li Zhao
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, People's Republic of China
| | - Baocai Xu
- Department of Daily Chemical Engineering, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing 100048, People's Republic of China
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6
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Wolanin J, Barré L, Dalmazzone C, Bauer D. Investigation of the adsorption of a mixture of two anionic surfactants, AOT and SDBS, on silica at ambient temperature. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.126098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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7
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Hou Z, Wu X, Wu G, Yang E, Sun G, Wu A, Zheng L. Self-Assembled Vesicles Formed by Positional Isomers of Sodium Dodecyl Benzene Sulfonate-Based Pseudogemini Surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7593-7601. [PMID: 32513009 DOI: 10.1021/acs.langmuir.0c01206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The construction of pseudogemini surfactants based on noncovalent interactions (such as electrostatic interaction and π-π stacking) was a powerful method to assemble well-defined aggregates in aqueous solution. The mixtures of butane-1,4-bis(methylimidazolium bromide) ([mim-C4-mim]Br2) and positional isomers of sodium dodecyl benzene sulfonate (SDBS-0,11 or SDBS-3,8) in a molar ratio of 1:2 were studied to characterize the effect of straight and branched alkyl chains on the aggregation behavior of pseudogemini surfactants. Spontaneous phase transition from micelles to vesicles was formed by these two kinds of complexes. Interestingly, a densely stacked onion-like structure (multilamellar vesicles) with more than one dozen layers was fabricated. The micelle and vesicle phases were characterized in detail by cryogenic transmission electron microscopy, polarized optical microscopy, dynamic light scattering, and rheological measurements. It can be clearly demonstrated that the structure of alkyl chain can significantly influence the surface adsorption, solution self-assembly, and aqueous two-phase system of pseudogemini surfactants. Our work provided a convenient technique to achieve controlled self-assembly by introducing positional isomers of surfactants.
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Affiliation(s)
- Zhaowei Hou
- School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
- Exploration and Development Research Institute of Daqing Oilfield Co. Ltd., Daqing 163712, China
| | - Xiaolin Wu
- School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
- Exploration and Development Research Institute of Daqing Oilfield Co. Ltd., Daqing 163712, China
| | - Guopeng Wu
- Exploration and Development Research Institute of Daqing Oilfield Co. Ltd., Daqing 163712, China
| | - Erlong Yang
- School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
| | - Guannan Sun
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China
| | - Aoli Wu
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China
| | - Liqiang Zheng
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China
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8
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He H, Liu Z, Chen S, He X, Wang X, Wang X. Active Role of Water in the Hydration of Macromolecules with Ionic End Group for Hydrophobic Effect-Caused Assembly. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00683] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Huiwen He
- College of Materials Science and Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou 310014, China
| | - Zhen Liu
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Si Chen
- College of Materials Science and Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou 310014, China
| | - Xiaohua He
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China
| | - Xu Wang
- College of Materials Science and Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou 310014, China
| | - Xiaosong Wang
- Waterloo Institute for Nanotechnology and Department of Chemistry, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
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9
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Yao K, Sun L, Ding X, Wang Y, Liu T, Liu C, Tan J, Zhao L, Xu B, Romsted L. Simultaneous determination of interfacial molarities of an alcohol, bromide ion, and water during an alcohol induced microstructural transition: the difference between medium and long chain alcohols. SOFT MATTER 2020; 16:5148-5156. [PMID: 32395738 DOI: 10.1039/d0sm00665c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The transitions between surfactant aggregate structures are triggered by changes in chemical or physical stimulations, including addition of additives. Effects of added alcohols on aggregate morphologies correlate strongly with alcohol chain length. The local molarities of alcohol, water, and counterions in the interfacial regions play an important role in controlling the aggregate morphologies. However, direct experimental estimates of changes of interfacial alcohol molarities during alcohol induced micelle-to-vesicle transitions have never been reported. Ellipsoidal-wormlike micelle-vesicle transitions in CTAB/KBr aqueous solutions in the presence of long-chain octanol were characterized by using combined rheological, dynamic light scattering (DLS), transmission electron microscopy (TEM) and turbidity measurements. However, the transitions are absent with added butanol. The chemical trapping method (CT) was employed to understand the differences between medium- and long-chain alcohols in determining aggregate morphology. The CT method was used to estimate interfacial water, alcohol, and counterion molarities with increasing stoichiometric alcohol concentrations. With 55 mM alcohol added, the interfacial octanol molarity is 0.9 M, which is three times higher than that for butanol. With added octanol, the ellipsoidal-wormlike micelle-vesicle transition is accompanied by a concurrent sharp increase of interfacial water molarities and a decrease of interfacial counterion molarity, which is not observed with added butanol. The CT data was also employed to estimate the changes of Israelachvili's packing parameter with increasing added alcohol concentration. Our result provides critical molecular level information for understanding the morphological transitions of CTAB/additives.
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Affiliation(s)
- Kaixin Yao
- Department of Applied Chemistry, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing, 100048, People's Republic of China.
| | - Lijie Sun
- Department of Applied Chemistry, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing, 100048, People's Republic of China.
| | - Xiaoxuan Ding
- Department of Applied Chemistry, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing, 100048, People's Republic of China.
| | - Yuzhao Wang
- Department of Applied Chemistry, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing, 100048, People's Republic of China.
| | - Tianze Liu
- Department of Applied Chemistry, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing, 100048, People's Republic of China.
| | - Changyao Liu
- Department of Applied Chemistry, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing, 100048, People's Republic of China.
| | - Jiajing Tan
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Li Zhao
- Department of Applied Chemistry, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing, 100048, People's Republic of China.
| | - Baocai Xu
- Department of Applied Chemistry, Beijing Technology and Business University, No. 11 Fucheng Road, Beijing, 100048, People's Republic of China.
| | - Larry Romsted
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road Piscataway, New Jersey 08854, USA
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10
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Kang B, Tang H, Zhao Z, Song S. Hofmeister Series: Insights of Ion Specificity from Amphiphilic Assembly and Interface Property. ACS OMEGA 2020; 5:6229-6239. [PMID: 32258857 PMCID: PMC7114165 DOI: 10.1021/acsomega.0c00237] [Citation(s) in RCA: 132] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 03/13/2020] [Indexed: 05/04/2023]
Abstract
Hofmeister series (HS), ion specific effect, or lyotropic sequence acts as a pivotal part in a number of biological and physicochemical phenomena, e.g., changing the solubility of hydrophobic solutes, the cloud points of polymers and nonionic surfactants, the activities of various enzymes, the action of ions on an ion-channel, and the surface tension of electrolyte solutions, etc. This review focused on how ion specificity influences the critical micelle concentration (CMC) and how the thermoresponsive behavior of surfactants, and the dynamic transition of the aggregate, controls the aggregate transition and gel formation and tunes the properties of air/water interfaces (Langmuir monolayer and interfacial free energy). Recent progress of the ion specific effect in bulk phase and at interfaces in amphiphilic systems and gels is summarized. Applications and a molecular level theoretical explanation of HS are discussed comprehensively. This review is aimed to supply a fresh and comprehensive understanding of Hofmiester phenomena in surfactants, polymers, colloids, and interface science and to provide a guideline to design the microstructures and templates for preparation of nanomaterials.
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Affiliation(s)
- Beibei Kang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Huicheng Tang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Zengdian Zhao
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Shasha Song
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, P. R. China
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11
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Vera RE, Salazar‐Rodríguez F, Marquez R, Forgiarini AM. How the Influence of Different Salts on Interfacial Properties of Surfactant–Oil–Water Systems at Optimum Formulation Matches the Hofmeister Series Ranking. J SURFACTANTS DETERG 2020. [DOI: 10.1002/jsde.12406] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ramon E. Vera
- Laboratorio FIRPUniversidad de Los Andes Mérida Av Don Tulio Febres Cordero, Mérida 5101 Venezuela
| | | | - Ronald Marquez
- Laboratorio FIRPUniversidad de Los Andes Mérida Av Don Tulio Febres Cordero, Mérida 5101 Venezuela
| | - Ana M. Forgiarini
- Laboratorio FIRPUniversidad de Los Andes Mérida Av Don Tulio Febres Cordero, Mérida 5101 Venezuela
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12
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Aggregation of Lipid A Variants: A Hybrid Particle-Field Model. Biochim Biophys Acta Gen Subj 2020; 1865:129570. [PMID: 32105775 DOI: 10.1016/j.bbagen.2020.129570] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 02/10/2020] [Accepted: 02/19/2020] [Indexed: 12/23/2022]
Abstract
Lipid A is one of the three components of bacterial lipopolysaccharides constituting the outer membrane of Gram-negative bacteria, and is recognized to have an important biological role in the inflammatory response of mammalians. Its biological activity is modulated by the number of acyl-chains that are present in the lipid and by the dielectric medium, i.e., the type of counter-ions, through electrostatic interactions. In this paper, we report on a coarse-grained model of chemical variants of Lipid A based on the hybrid particle-field/molecular dynamics approach (hPF-MD). In particular, we investigate the stability of Lipid A bilayers for two different hexa- and tetra-acylated structures. Comparing particle density profiles along bilayer cross-sections, we find good agreement between the hPF-MD model and reference all-atom simulation for both chemical variants of Lipid A. hPF-MD models of constituted bilayers composed by hexa-acylated Lipid A in water are stable within the simulation time. We further validate our model by verifying that the phase behavior of Lipid A/counterion/water mixtures is correctly reproduced. In particular, hPF-MD simulations predict the correct self-assembly of different lamellar and micellar phases from an initially random distribution of Lipid A molecules with counterions in water. Finally, it is possible to observe the spontaneous formation and stability of Lipid A vesicles by fusion of micellar aggregates.
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13
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McAulay K, Ucha PA, Wang H, Fuentes-Caparrós AM, Thomson L, Maklad O, Khunti N, Cowieson N, Wallace M, Cui H, Poole RJ, Seddon A, Adams DJ. Controlling the properties of the micellar and gel phase by varying the counterion in functionalised-dipeptide systems. Chem Commun (Camb) 2020; 56:4094-4097. [DOI: 10.1039/d0cc01252a] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The micellar aggregates formed at high pH for dipeptide-based gelators can be varied by using different alkali metal salts to prepare the solutions.
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Affiliation(s)
- Kate McAulay
- School of Chemistry
- University of Glasgow
- Glasgow
- UK
| | - Pedro Agís Ucha
- School of Chemistry
- University of Glasgow
- Glasgow
- UK
- Department of Chemical Engineering
| | - Han Wang
- Department of Chemical and Biomolecular Engineering
- Whiting School of Engineering
- Johns Hopkins University
- Baltimore
- USA
| | | | - Lisa Thomson
- School of Chemistry
- University of Glasgow
- Glasgow
- UK
| | - Osama Maklad
- School of Engineering
- University of Liverpool
- Liverpool
- UK
| | - Nikul Khunti
- Diamond Light Source Ltd
- Harwell Science and Innovation Campus
- Didcot
- UK
| | - Nathan Cowieson
- Diamond Light Source Ltd
- Harwell Science and Innovation Campus
- Didcot
- UK
| | | | - Honggang Cui
- Department of Chemical and Biomolecular Engineering
- Whiting School of Engineering
- Johns Hopkins University
- Baltimore
- USA
| | | | - Annela Seddon
- School of Physics
- HH Wills Physics Laboratory
- University of Bristol
- Bristol
- UK
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