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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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Lu C, Liu W, Yuan Z, Wang L, Zhang Z, Gao Q, Ding W. Study on the Behavior of Saturated Cardanol-Based Surfactants at the Crude Oil/Water Interface through Molecular Dynamics Simulations. J Phys Chem B 2023; 127:8938-8949. [PMID: 37816076 DOI: 10.1021/acs.jpcb.3c05517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/12/2023]
Abstract
Cardanol is a green biosurfactant with broad application prospects, which is expected to be used to enhance oil recovery (EOR). This paper designed two types of surfactants (extended and nonextended), including six kinds of nonionic and anion-nonionic surfactants. The position changes of PO and EO chains and the effects of different hydrophilic groups on the interface properties were studied with molecular dynamics simulations by constructing a model of crude oil (containing four components) and water molecules. The results of interfacial tension and solvent-accessible surface area showed that the interfacial properties of sulfate were better than those of sulfonates and nonionic surfactants. Meanwhile, the interface properties of nonextended surfactants were better than those of extended surfactants. The gyration radius (Rg) and tilt angle data demonstrated that when EO chains were located between hydrophobic groups and PO chains (nonextended surfactants), the adsorption capacity of surfactants at crude oil and water interfaces could be effectively improved. The radial distribution function of the hydrophilic group and hydrophobic group of surfactants with water molecules and four components of the crude oil molecule, respectively, explained that surfactants (8EO8POSO4) had better emulsification performance when the intermolecular interactions between crude oil and water two phases were relatively balanced. This study provides a theoretical reference for the design of oil-displacement surfactants and the mechanism analysis of emulsification properties.
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Affiliation(s)
- Congying Lu
- Provincial Key Laboratory of Oil & Gas Chemical Technology, Chemistry and Chemical Engineering College, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
- Heilongjiang Provincial Key Laboratory of Oilfield Applied Chemistry and Technology, College of Chemical Engineering, Daqing Normal University, Daqing, Heilongjiang 163712, China
| | - Weiyang Liu
- College of Petroleum Engineering, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
| | - Zhenyu Yuan
- Heilongjiang Provincial Key Laboratory of Oilfield Applied Chemistry and Technology, College of Chemical Engineering, Daqing Normal University, Daqing, Heilongjiang 163712, China
| | - Ling Wang
- Provincial Key Laboratory of Oil & Gas Chemical Technology, Chemistry and Chemical Engineering College, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
| | - Zuxi Zhang
- Provincial Key Laboratory of Oil & Gas Chemical Technology, Chemistry and Chemical Engineering College, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
| | - Qinghe Gao
- Heilongjiang Provincial Key Laboratory of Oilfield Applied Chemistry and Technology, College of Chemical Engineering, Daqing Normal University, Daqing, Heilongjiang 163712, China
| | - Wei Ding
- Provincial Key Laboratory of Oil & Gas Chemical Technology, Chemistry and Chemical Engineering College, Northeast Petroleum University, Daqing, Heilongjiang 163318, China
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Sun Q, Cao XL, Yuan FQ, Ma BD, Ren J, Xiao H, Zhang L, Zhang L. Dilational Rheology of Extended Surfactants at the Air/Water and Oil/Water Interfaces: Effect of Propylene Oxide Group Numbers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:13008-13018. [PMID: 37677153 DOI: 10.1021/acs.langmuir.3c01120] [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
In this paper, the interfacial properties of extended surfactants with different oxypropylene (PO) groups were comprehensively investigated by using interfacial dilational rheology. The differences in molecular orientation, spatial configuration, and relaxation process were compared at the gas-water interface and oil-water interface. The influences of the PO groups on the interface viscoelasticity were analyzed, providing important theoretical support for the wide application of extended surfactants. Experimental results show that the lower number of PO groups in extended surfactants does not cause differences in their presence states on the interface; however, once it increases, the longer PO segment will spiral up in the direction perpendicular to the interface, forming a spatial configuration like a thin cylinder. Compared with air, the PO group has better solubility in the oil phase. The chain segment can still maintain a helical extension from the beginning to the end as a result. However, the upper layer of the thin cylinder will collapse to a certain extent at the surface. Moreover, the orientation of the hydrophobic side has a dynamic process of "tilting to upright" with the increase of adsorption amount or in response to interfacial dilation and compression. The increase of PO number or the insertion of oil molecules has little effect on dilational modulus, and the interfacial film strength is generally relatively low. That is to say, the better emulsifying and solubilizing ability of PO-containing extended surfactants may be more attributed to the matching steric effect at interface or better packing action in bulk phase than to higher film strength.
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Affiliation(s)
- Qi Sun
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Xu-Long Cao
- Exploration and Development Research Institute, Sheng Li Oilfield Company, SINOPEC, Dongying, Shandong 257015, P. R. China
| | - Fu-Qing Yuan
- Exploration and Development Research Institute, Sheng Li Oilfield Company, SINOPEC, Dongying, Shandong 257015, P. R. China
| | - Bao-Dong Ma
- Exploration and Development Research Institute, Sheng Li Oilfield Company, SINOPEC, Dongying, Shandong 257015, P. R. China
| | - Jia Ren
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hongyan Xiao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- Binzhou Institute of Technology, Weiqiao-UCAS Science and Technology Park, Binzhou, Shandong 256606, P. R. China
| | - Lei Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Lu Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
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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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Correlation among copolyether spacers, molecular geometry and interfacial properties of extended surfactants. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Blahnik J, Müller E, Braun L, Denk P, Kunz W. Nanoscopic microheterogeneities or pseudo-phase separations in non-conventional liquids. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2021.101535] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Wei L, Zhang L, Chao M, Jia X, Liu C, Shi L. Synthesis and Study of a New Type of Nonanionic Demulsifier for Chemical Flooding Emulsion Demulsification. ACS OMEGA 2021; 6:17709-17719. [PMID: 34278156 PMCID: PMC8280667 DOI: 10.1021/acsomega.1c02352] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 06/22/2021] [Indexed: 05/31/2023]
Abstract
The application of chemical flooding improves the stability of the produced emulsion, which reduces the demulsification efficiency of conventional demulsifiers. To improve the demulsification effect, in this paper, a new multibranched nonanionic polyether demulsifier, FYJP, was prepared by grafting carboxylate based on a nonionic demulsifier. The FYJP demulsifier could generate an initiator through p-tert-butylphenol, triethylenetetramine, and methanol, which was polymerized with ethylene oxide (EO) and propylene oxide (PO) to produce a nonionic polyether demulsifier. Sodium chloroacetate was used to modify the polyether demulsifier to obtain a new type of nonanionic polyether demulsifier. The FYJP polyether demulsifier was characterized by the hydrophilic-lipophilic balance (HLB) value, relative solubility (RSN), and surface activity of the demulsifier, and the demulsification mechanism was analyzed by a microscopic demulsification process test, and the effect of demulsifier dosage on the demulsification effect was discussed. Meanwhile, a dehydration test was carried out. The experimental results showed that the highest dehydration rate of the demulsifier was 94.7% at 85 °C, 100 ppm demulsifier dosage, 50 mL of a W/O emulsion, and 120 min demulsification time. The abovementioned studies show that FYJP is an effective demulsifier for chemical flooding emulsions, and this work promises to provide a reference for future demulsifier research.
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Affiliation(s)
- Lixin Wei
- School
of Petroleum Engineering, Northeast Petroleum
University, Daqing 163318, China
| | - Lin Zhang
- School
of Petroleum Engineering, Northeast Petroleum
University, Daqing 163318, China
| | - Meng Chao
- Gas
Production Branch of Daqing Oilfield Co Ltd., Daqing 163453, China
| | - Xinlei Jia
- College
of Chemical Engineering ashaind Safety, Binzhou University, Binzhou 256600, China
| | - Chao Liu
- School
of Petroleum Engineering, Northeast Petroleum
University, Daqing 163318, China
| | - Lijun Shi
- School
of Petroleum Engineering, Northeast Petroleum
University, Daqing 163318, China
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Denk P, El Maangar A, Lal J, Kleber D, Zemb T, Kunz W. Phase diagrams and microstructures of aqueous short alkyl chain polyethylene glycol ether carboxylate and carboxylic acid triblock surfactant solutions. J Colloid Interface Sci 2021; 590:375-386. [PMID: 33556757 DOI: 10.1016/j.jcis.2021.01.061] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 11/15/2022]
Abstract
HYPOTHESIS The surfactant C8EO8CH2COOH (Akypo LF2) and its salts have a small hydrophobic and a significantly longer hydrophilic part. As a consequence, there must be a significant steric constraint, once these surfactant molecules form micelles. In addition, the partially charged headgroups should bring some additional fine-tuning via electrostatic interactions to this "essentially non-ionic" surfactant. EXPERIMENTS Phase diagrams of binary mixtures of water and C8EO8CH2COOH are established over large concentration and temperature ranges, also at different pHs and in the presence of sodium and calcium ions. Surface tensions and osmotic pressures are measured to understand the systems. To evaluate the microstructures, also Dynamic Light Scattering and Small-Angle X-ray Scattering are performed. FINDINGS Apart from the formation of coacervates at very low surfactant concentrations, spherical micelles persist over the whole concentration and temperature range and do not change in size and shape. At very high surfactant concentrations, above 60% by weight, where the headgroups are no longer fully hydrated, the standard core-shell structure of micelles vanishes and highly stabilized aggregates of 8-26 octyl chains are suspended in interdigitated polyoxyethylene layers and form an "osmotic brush". When the acid is partially transformed to a sodium salt, the repulsion between the micelles increases, whereas bridging between micelles prevails, when the counterions are calcium cations. Remarkably, the negative charges of the headgroups are randomly distributed in the hydrophilic ethylene oxide shell. Altogether, a phase diagram without lyotropic liquid crystalline phases and an extreme shift of the cloud-point in temperature and composition is found, similar to the phase diagram of C8EO8OH already known in literature. The phase properties can be explained by the curvature and packing constraints together with the Lindemann rule applied to short hydrocarbon chains.
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Affiliation(s)
- Patrick Denk
- Institute of Physical and Theoretical Chemistry, Faculty of Chemistry and Pharmacy, University of Regensburg, D-93040 Regensburg, Germany
| | | | - Jyotsana Lal
- Institute of Physical and Theoretical Chemistry, Faculty of Chemistry and Pharmacy, University of Regensburg, D-93040 Regensburg, Germany; Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA; Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA
| | - David Kleber
- Institute of Physical and Theoretical Chemistry, Faculty of Chemistry and Pharmacy, University of Regensburg, D-93040 Regensburg, Germany
| | - Thomas Zemb
- ICSM, Univ. Montpellier, CEA, CNRS, ENSCM, Marcoule, France
| | - Werner Kunz
- Institute of Physical and Theoretical Chemistry, Faculty of Chemistry and Pharmacy, University of Regensburg, D-93040 Regensburg, Germany.
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Illous E, Doblinger S, Pipolo S, Ontiveros JF, Lebeuf R, Aubry JM. Salt-tolerance of alkyl-glyceryl ether carboxylates hydrotropes and surfactants. Dramatic effect of the methylation of the glyceryl spacer. J Colloid Interface Sci 2020; 585:808-819. [PMID: 33158559 DOI: 10.1016/j.jcis.2020.10.061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 10/16/2020] [Accepted: 10/17/2020] [Indexed: 10/23/2022]
Abstract
HYPOTHESIS The insertion of polyether spacers between the anionic head and the alkyl chain of ionic surfactants significantly improves their salt-tolerance. The aim of this work is to study whether the petro-based polyethoxy spacer can be replaced by a glyceryl ether group for high salinity applications. EXPERIMENTS A series of amphiphilic sodium salts of alkyl glyceryl ether carboxylates are synthesized with different alkyl chain lengths from 4 to 12 and various spacers between the glyceryl and the carboxylate groups. Their aggregation behavior is studied by tensiometry and their amphiphilicities are assessed by the PIT-slope method. The dramatic effect of the methylation of the glyceryl spacer on the salt-tolerance is highlighted, and rationalized by DFT calculations and molecular dynamics. FINDINGS In contrast to the corresponding sodium soap, n-C6H13-CO2Na, and to the non-methylated counterpart, the sodium salt of 1-pentyl-3-methyl glyceryl ether methylene carboxylate ([5.0.1]-CH2CO2Na) exhibits an excellent salt-tolerance since it remains water-soluble with NaCl or CaCl2 concentrations greater than 20 wt% at 25 °C. Amphiphiles with short alkyl chains (<C8) act as hydrotropes whereas longer compounds behave as surfactants whose CMC are lower than their corresponding isomers with ethoxy spacers n-Ci(EO)2CH2CO2Na.
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Affiliation(s)
- Estelle Illous
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, F-59000 Lille, France
| | - Simon Doblinger
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, F-59000 Lille, France
| | - Silvio Pipolo
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, F-59000 Lille, France
| | - Jesús F Ontiveros
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, F-59000 Lille, France
| | - Raphaël Lebeuf
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, F-59000 Lille, France.
| | - Jean-Marie Aubry
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181 - UCCS - Unité de Catalyse et Chimie du Solide, F-59000 Lille, France.
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Illous E, Ontiveros JF, Lemahieu G, Lebeuf R, Aubry JM. Amphiphilicity and salt-tolerance of ethoxylated and propoxylated anionic surfactants. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124786] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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How to Use the Normalized Hydrophilic-Lipophilic Deviation (HLDN) Concept for the Formulation of Equilibrated and Emulsified Surfactant-Oil-Water Systems for Cosmetics and Pharmaceutical Products. COSMETICS 2020. [DOI: 10.3390/cosmetics7030057] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The effects of surfactant molecules involved in macro-, mini-, nano-, and microemulsions used in cosmetics and pharmaceuticals are related to their amphiphilic interactions with oil and water phases. Basic ideas on their behavior when they are put together in a system have resulted in the energy balance concept labeled the hydrophilic-lipophilic deviation (HLD) from optimum formulation. This semiempirical equation integrates in a simple linear relationship the effects of six to eight variables including surfactant head and tail, sometimes a cosurfactant, oil-phase nature, aqueous-phase salinity, temperature, and pressure. This is undoubtedly much more efficient than the hydrophilic-lipophilic balance (HLB) which has been used since 1950. The new HLD is quite important because it allows researchers to model and somehow predict the phase behavior, the interfacial tension between oil and water phases, their solubilization in single-phase microemulsion, as well as the corresponding properties for various kinds of macroemulsions. However, the HLD correlation, which has been developed and used in petroleum applications, is sometimes difficult to apply accurately in real cases involving ionic–nonionic surfactant mixtures and natural polar oils, as it is the case in cosmetics and pharmaceuticals. This review shows the confusion resulting from the multiple definitions of HLD and of the surfactant parameter, and proposes a “normalized” Hydrophilic-Lipophilic Deviation (HLDN) equation with a surfactant contribution parameter (SCP), to handle more exactly the effects of formulation variables on the phase behavior and the micro/macroemulsion properties.
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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: 137] [Impact Index Per Article: 34.3] [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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Salager JL, Forgiarini A, Marquez R. Extended Surfactants Including an Alkoxylated Central Part Intermediate Producing a Gradual Polarity Transition-A Review of the Properties Used in Applications Such as Enhanced Oil Recovery and Polar Oil Solubilization in Microemulsions. J SURFACTANTS DETERG 2019. [DOI: 10.1002/jsde.12331] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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14
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Cui L, Lagorse M, Bourrel M. Unique Solubility of Switchable Alkyl‐Amine Surfactants in Water. J SURFACTANTS DETERG 2019. [DOI: 10.1002/jsde.12352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Leyu Cui
- TOTAL S.A., Exploration and Production (EP), Pôle Economique 2 – BP 47 Lacq 64170 France
| | - Marine Lagorse
- TOTAL S.A., Exploration and Production (EP), Pôle Economique 2 – BP 47 Lacq 64170 France
| | - Maurice Bourrel
- TOTAL S.A., Exploration and Production (EP), Pôle Economique 2 – BP 47 Lacq 64170 France
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16
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Lv M, Luo C, Yang J, Zhou Y, Liu C, Xu B. Effect of number of oxypropylene on dynamic interfacial tensions of extended surfactants. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.03.054] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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What dominates the interfacial properties of extended surfactants: Amphipathicity or surfactant shape? J Colloid Interface Sci 2019; 547:190-198. [PMID: 30954763 DOI: 10.1016/j.jcis.2019.04.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 03/31/2019] [Accepted: 04/01/2019] [Indexed: 11/23/2022]
Abstract
HYPOTHESIS The properties of conventional surfactants (c-surfactants) are generally accepted to be amphipathicity-dominated, but extended surfactants (e-surfactants) are additionally polypropylene oxide (PPO)-dependent; this additional property makes us wonder how an intramolecular PPO spacer would be "extended" at various interfaces and what is responsible for the excellent all-round properties of e-surfactants. EXPERIMENTS A series of novel sodium medium alkyl chain PPO-b-PEO sulfates (2-ethylhexyl polypropylene oxide-block-polyethylene oxide sulfates, C8PpEeS) were designed, synthesized and structurally identified. Tensiometry was applied to estimate the surfactant shape at the air/water surface. Surface tension, interfacial tension, emulsifying power, electrolyte tolerance, adsorption onto oil sands and thermal hydrolysis stability were measured to evaluate the effect of the PPO coil on the interfacial and micellar properties of the e-surfactants. FINDINGS On the basis of obtaining greater values for e-surfactants than c-surfactants for both surface area (am) per surfactant molecule and the corresponding shape factor (S), we were surprised to find that e-surfactants form a rugby ball shape not only at the air/water surface but also at the oil/water interface; this result is potentially explained by the PPO spacer coiling and collapsing to produce dense packing at the monolayer adsorption, which is rationally borrowed by other interfaces. Many positive or negative correlations were observed between the interfacial/micellar properties of C8PpEeS and am values, which seems that the surfactant shape dominants the properties of the e-surfactants. In fact, the properties of C8PpEeS are dominated by the dynamic amphipathicity and assisted by the rugby ball shape of the molecules because of both being driven by the dynamic biphasic affinity of the PPO coil in response to the external environment; these findings provide soft interfacial materials specially adapted for surfactant flooding.
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Chen J, Hu XY, Fang Y, Liu HH, Xia YM. Comparative Study of Conventional/Ethoxylated/Extended n-Alkylsulfate Surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3116-3125. [PMID: 30758969 DOI: 10.1021/acs.langmuir.8b04022] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A series of novel anionic e-surfactants n-C cP pS was molecular designed and synthesized from long-chain fatty alcohols by polypropoxylation and sulfation followed by neutralization. Excellent all-round performance of extended surfactants (e-surfactants) interests us how a simple polypropylene oxide (PPO) spacer has great effects on properties. By a comparative study of conventional/ethoxylated/extended n-alkylsulfate surfactants, we were surprised to find that e-surfactants are in an obvious rugby shape at the air/water surface according to molecular surface area ( am), and it comes down to the intramolecular PPO spacer coiling and surface-induced collapse. On the basis of the interfacial properties of the e-surfactants, it is found that the PPO spacer can provide both hydrophilic and lipophilic contributions to an e-surfactant molecule. The synergism between PPO spacers and alkyl chains indicates that a certain PPO spacer can adjust the contributions in view of different alkyl chain lengths. Therefore, it is both the rugby-shaped molecular geometry of e-surfactants and the dynamic amphipathicity of a PPO spacer that makes e-surfactants behave with excellent interfacial and solution properties for household cleaning. Therefore, this work gives us a hint that the molecular geometry of surfactants plays a vital role in interfacial and solution properties similar to molecular amphipathicity.
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Affiliation(s)
- Ji Chen
- Key Laboratory of Synthetic and Biological Colloids (Ministry of Education); School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Xue-Yi Hu
- Key Laboratory of Synthetic and Biological Colloids (Ministry of Education); School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Yun Fang
- Key Laboratory of Synthetic and Biological Colloids (Ministry of Education); School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Huan-Huan Liu
- Key Laboratory of Synthetic and Biological Colloids (Ministry of Education); School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
| | - Yong-Mei Xia
- Key Laboratory of Synthetic and Biological Colloids (Ministry of Education); School of Chemical and Material Engineering , Jiangnan University , Wuxi , Jiangsu 214122 , P. R. China
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19
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Mixed micellization/clouding assisted solubilization of polycyclic aromatic hydrocarbon: Potential in environmental remediation. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.09.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Fedorchuk OI, Kulichenko SA. Determination of Non-Narcotic Analgetics by HPLC with Preconcentration on Triton X-100 Induced Phases. JOURNAL OF ANALYTICAL CHEMISTRY 2018. [DOI: 10.1134/s1061934818090022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Zhou Y, Lv M, Liu C, Xu B. Foam and Rheological Properties of a Kind of Extended Surfactants. TENSIDE SURFACT DET 2018. [DOI: 10.3139/113.110568] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
The foam and rheological properties of four extended surfactants C12–14PmE2S (m = 0, 3, 5, and 8) of four different concentrations were investigated in this paper. The foam properties, including, foamability, foam stability, liquid carrying ability, foam drainage and foam morphology were characterized. The rheological measurements were carried out through frequency sweep in the oscillation mode. The foamability and foam stability decreased with increasing numbers of PO groups embedded in those surfactants. At the same concentration, the longer the PO chain of the surfactant molecule, the larger the liquid carrying capacity of the foam. The foaming number decreases as the time increases, and longer PO chains were associated with faster foam number decline. The rheological measurements show that those surfactant solutions are “liquid-like”. With increasing surfactant concentration, the viscous modulus of C12–14P8E2S increases gradually, whereas that of C12–14E2S decreases.
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22
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Lv M, Zhou Y, Wang S, Han F, Xu B. Effects of the Polypropylene Oxide Number on the Surface Properties of a Type of Extended Surfactant. J SURFACTANTS DETERG 2018. [DOI: 10.1002/jsde.12039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mengdie Lv
- Beijing Key Laboratory of Flavor Chemistry, School of Food and Chemical Engineering, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients; Beijing Technology and Business University, No. 11 Fucheng Road; Beijing 100048 China
| | - Yawen Zhou
- Beijing Key Laboratory of Flavor Chemistry, School of Food and Chemical Engineering, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients; Beijing Technology and Business University, No. 11 Fucheng Road; Beijing 100048 China
| | - Shan Wang
- Beijing Key Laboratory of Flavor Chemistry, School of Food and Chemical Engineering, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients; Beijing Technology and Business University, No. 11 Fucheng Road; Beijing 100048 China
| | - Fu Han
- Beijing Key Laboratory of Flavor Chemistry, School of Food and Chemical Engineering, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients; Beijing Technology and Business University, No. 11 Fucheng Road; Beijing 100048 China
| | - Baocai Xu
- Beijing Key Laboratory of Flavor Chemistry, School of Food and Chemical Engineering, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients; Beijing Technology and Business University, No. 11 Fucheng Road; Beijing 100048 China
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23
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Naqvi AZ, Kabir-Ud-Din. Clouding phenomenon in amphiphilic systems: A review of five decades. Colloids Surf B Biointerfaces 2018; 165:325-344. [PMID: 29547842 DOI: 10.1016/j.colsurfb.2018.01.060] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 01/26/2018] [Accepted: 01/29/2018] [Indexed: 11/26/2022]
Abstract
Phase separation in amphiphilic systems is an important phenomenon. The temperature at which an amphiphilic solution phase separates is known as Cloud Point (CP). This article reviews in detail the process of phase separation in various amphiphiles (surfactants, polymers and drugs) and effect of different classes of additives on the CP of these amphiphilic systems. Ions affect the CP of drugs in a different way: kosmotropes and hard bases decrease while chaotropes and soft bases increase the CP of nonionic and cationic surfactants. Anionic surfactants show CP in presence of quaternary salts only. Thus, depending upon the nature and concentration of additive, the CP of an amphiphilic system gets increased or decreased and, hence, properties of the system may be tuned as per the need and use. A system with CP at high concentration can be made to phase separate at lower concentration by simply introducing an appropriate additive in it. This makes the system cost effective. On the other hand, if not required, a low CP can be enhanced with the help of another type of a suitable additive.
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Affiliation(s)
- Andleeb Z Naqvi
- Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, India.
| | - Kabir-Ud-Din
- Department of Chemistry, Faculty of Natural Sciences, Arba Minch University, Arba Minch, Ethiopia
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24
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Jankowski A, Jankowski A, Kluczyk A, Szemik-Hojniak A. Effect of neutral salts on the excited state proton transfer in the fluorescent probe anchored to the uncharged micelles. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2016.06.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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25
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Wang W, Li J, Yang X, Li P, Guo C, Li Q. Synthesis and properties of two surfactants containing polyoxypropylene block and short branched alkyl chain. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.04.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Liu X, Zhao Y, Li Q, Niu J. Surface tension, interfacial tension and emulsification of sodium dodecyl sulfate extended surfactant. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.01.037] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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27
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Yan X, Wang M, Cook TR, Zhang M, Saha ML, Zhou Z, Li X, Huang F, Stang PJ. Light-Emitting Superstructures with Anion Effect: Coordination-Driven Self-Assembly of Pure Tetraphenylethylene Metallacycles and Metallacages. J Am Chem Soc 2016; 138:4580-8. [DOI: 10.1021/jacs.6b00846] [Citation(s) in RCA: 185] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Xuzhou Yan
- Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake
City, Utah 84112, United States
| | - Ming Wang
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
| | - Timothy R. Cook
- Department
of Chemistry, University at Buffalo, 359 Natural Sciences Complex, Buffalo, New York 14260, United States
| | - Mingming Zhang
- Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake
City, Utah 84112, United States
| | - Manik Lal Saha
- Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake
City, Utah 84112, United States
| | - Zhixuan Zhou
- Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake
City, Utah 84112, United States
| | - Xiaopeng Li
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, Texas 78666, United States
| | - Feihe Huang
- State Key Laboratory of Chemical Engineering, Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China
| | - Peter J. Stang
- Department of Chemistry, University of Utah, 315 South 1400 East, Room 2020, Salt Lake
City, Utah 84112, United States
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28
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Xie D, Zhao J. Cloud point phenomena in aqueous solutions of an anionic gemini surfactant with a dibenzene spacer in the presence of tetra-n-propyl-ammonium bromide. RSC Adv 2016. [DOI: 10.1039/c5ra18043k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The cloud point behaviour of a carboxylate gemini surfactant,O,O′-bis(sodium 2-dodecylcarboxylate)-p-dibenzenediol was observed in the presence of tetra-propyl-ammonium bromide.
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Affiliation(s)
- Danhua Xie
- Department of Chemistry
- Fujian Province University Key Laboratory of Green Energy and Environment Catalysis
- Ningde Normal University
- Ningde
- P. R. China
| | - Jianxi Zhao
- Institute of Colloid and Interface Chemistry
- College of Chemistry and Chemical Engineering
- Fuzhou University
- Fuzhou
- P. R. China
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29
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Jiang Z, Liu Y, Li R, Ren X, Huang T. Preparation of antibacterial cellulose with a monochloro-s-triazine-based N-halamine biocide. POLYM ADVAN TECHNOL 2015. [DOI: 10.1002/pat.3691] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Zhiming Jiang
- Key Laboratory of Eco-textiles of Ministry of Education, College of Textiles and Clothing; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Yin Liu
- Key Laboratory of Eco-textiles of Ministry of Education, College of Textiles and Clothing; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Rong Li
- Key Laboratory of Eco-textiles of Ministry of Education, College of Textiles and Clothing; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Xuehong Ren
- Key Laboratory of Eco-textiles of Ministry of Education, College of Textiles and Clothing; Jiangnan University; Wuxi Jiangsu 214122 China
| | - T. S. Huang
- Department of Poultry Science; Auburn University; Auburn AL 36849 USA
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30
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Khoshsima A, Dehghani MR, Touraud D, Kunz W. Effects of salts and sucrose on the phase behavior of ternary mixtures of water, decane, and mono-ethylene glycol butyl ether. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.03.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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31
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Jakubowska A. Interactions of univalent counterions with headgroups of monomers and dimers of an anionic surfactant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3293-3300. [PMID: 25714134 DOI: 10.1021/la5049002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Specific ion effects in solution are related to the hydrated ion size and ion hydration, electrostatic interactions, dispersion forces, ion effects on water structure, and ion modification of surface tension. In this study, we tried to identify which factor determines the ion specificity observed. The preference and energy of metal cations binding with the headgroups of dodecylsulfate (DS) monomers and dimers were determined by mass spectrometry. In the gas phase, cation binding to DS dimer headgroups depends strongly on the cation radius. On the other hand, the interactions between DS monomer headgroups and chaotropic ions depend on the cation polarizability, and the binding of kosmotropic cations to DS monomer headgroups strongly depends on the Gibbs free energies of ion hydration. DS dimers are related to surfactants having doubly charged headgroups, and DS monomers are related to surfactants with singly charged headgroups. Our spectrometric study of the strength of counterion binding to free monomers of a surfactant provides insight into surfactant-counterion interactions at micellar interfaces in bulk solution.
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Affiliation(s)
- Anna Jakubowska
- Department of Physical Chemistry, Adam Mickiewicz University, Umultowska 89 b, 61-614 Poznań, Poland
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32
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Behr AM, Tucker CJ, Daugs ED. Performance of New Biodegradable Di-Sulfonate Surfactants as Hydrotropes in High-Temperature and Salinity Environments. J SURFACTANTS DETERG 2014. [DOI: 10.1007/s11743-014-1651-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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He ZQ, Zhang MJ, Fang Y, Jin GY, Chen J. Extended surfactants: A well-designed spacer to improve interfacial performance through a gradual polarity transition. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.03.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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34
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Fameau AL, Zemb T. Self-assembly of fatty acids in the presence of amines and cationic components. Adv Colloid Interface Sci 2014; 207:43-64. [PMID: 24345730 DOI: 10.1016/j.cis.2013.11.017] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 11/18/2013] [Accepted: 11/21/2013] [Indexed: 11/27/2022]
Abstract
Fatty acids can self-assemble under various shapes in the presence of amines or cationic components. We assemble and compare these types of self-assembly leading toward a catanionic system either with a cationic surfactant or with an amine component playing the role of counter-ion. First, we focus on the molar ratio as a key driving parameter. Known and yet un-known values from other quantities governing the colloidal properties of these systems such as structural surface charge, osmotic pressure, molecular segregation, rigidity, in plane colloidal interactions and melting transition are discussed. We include also recent results obtained on the interfacial and foaming properties of these systems. We will highlight the specificity of these self-assemblies leading to unusual macroscopic properties rich of robust applications.
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35
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Khimani M, Parekh P, Aswal VK, Bahadur P. Interaction, solubilization and location of p-hydroxybenzoic acid and its sodium salt in micelles of moderately hydrophilic PEO-PPO-PEO triblock copolymers. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2014; 37:38. [PMID: 24853632 DOI: 10.1140/epje/i2014-14038-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 04/15/2014] [Accepted: 04/25/2014] [Indexed: 06/03/2023]
Abstract
Micelles of ABA type triblock copolymers (where A is polyethylene oxide PEO and B is polypropylene oxide PPO) viz. Pluronic® P103, P104 and P105 (each containing almost the same PPO mol wt. ~ 3250 g/mol and 30, 40 and 50 wt.% of PEO, respectively) in the presence of p -hydroxybenzoic acid (PHBA) and its sodium salt (Na-PHBA) were examined by viscosity, dynamic light scattering (DLS), small angle neutron scattering (SANS) and NMR. Spherical polymeric micelles (apparent hydrodynamic diameter ~ 20 nm) in water at 30 °C grow in the presence of PHBA and transform into prolate-ellipsoidal shape with an increased aggregation number. The micellar transition was favored at higher PHBA concentration, temperature and for copolymers with more hydrophobicity. The PHBA salt, however, increased cloud point and showed only a marginal decrease in aggregation number even at much higher concentrations. The location of PHBA in micelle was elucidated by nuclear Overhauser enhancement spectroscopy (NOESY).
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Affiliation(s)
- Mehul Khimani
- Department of Chemistry, Veer Narmad South Gujarat University, 395 007, Surat, India,
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36
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Marcus J, Touraud D, Kunz W. Formulation and stability of a soap microemulsion and the apparent pKA herein. J Colloid Interface Sci 2013; 407:382-9. [DOI: 10.1016/j.jcis.2013.06.052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2013] [Revised: 06/17/2013] [Accepted: 06/19/2013] [Indexed: 11/16/2022]
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37
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Tarafdar PK, Reddy ST, Swamy MJ. Effect of Hofmeister Series Anions on the Thermotropic Phase Behavior of Bioactive O-Acylcholines. J Phys Chem B 2013; 117:9900-9. [DOI: 10.1021/jp403964k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
| | | | - Musti J. Swamy
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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38
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The role of NaSCN on the equimolar cationic–anionic surfactant mixtures: Evidence from NMR, surface tension and dynamic light scattering. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2012.10.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Bhattacharya S, Samanta SK. Unusual Salt-Induced Color Modulation through Aggregation-Induced Emission Switching of a Bis-cationic Phenylenedivinylene-Based π Hydrogelator. Chemistry 2012. [DOI: 10.1002/chem.201201940] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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40
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Klaus A, Tiddy GJT, Solans C, Harrar A, Touraud D, Kunz W. Effect of salts on the phase behavior and the stability of nanoemulsions with rapeseed oil and an extended surfactant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8318-8328. [PMID: 22537241 DOI: 10.1021/la300435t] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
For many decades, the solubilization of long-chain triglycerides in water has been a challenge. A new class of amphiphiles has been created to overcome this solubilization problem. The so-called "extended" surfactants contain a hydrophilic-lipophilic linker to reduce the contrast between the surfactant-water and surfactant-oil interfaces. In the present contribution, the effects of different anions and cations on the phase behavior of a mixture containing an extended surfactant (X-AES), a hydrotrope (sodium xylene sulfonate, SXS), water, and rapeseed oil were determined as a function of temperature. Nanoemulsions were obtained and characterized by conductivity measurements, light scattering, and optical microscopy. All salting-out salts show a transition from a clear region (O/W nanoemulsion), to a lamellar liquid crystalline phase region, a clear phase (bicontinuous L(3)), and again to a lamellar liquid crystalline phase region with increasing temperature. For the phase diagrams with NaSCN and Na(2)SO(4), only one clear region (O/W nanoemulsion) was observed, which turns into a lamellar phase region at elevated temperatures. Furthermore, the stability of the nanoemulsions was investigated by time-dependent measurements: the visual observation of phase separation, droplet size by dynamic light scattering (DLS), and optical microscopy. The mechanism of the different phase transitions is also discussed.
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Affiliation(s)
- Angelika Klaus
- Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany
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