Investigation of AOT/isooctane/water reverse microemulsion system with the presence of different mass ratios of SDS: Conductivity and water solubilization

Tan, Ziming; Zhang, Yang; Cheng, Dan; Li, Lü; Li, Yan; Xie, Xianmei

doi:10.1016/j.colsurfa.2022.129271

Cited by 10 publications

(4 citation statements)

References 72 publications

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“…The results in Figure 7 show that when the water content of the system was low, the change in conductivity was small, which is typical of W/O-type microemulsions [ 41 ]. As the water content continued to increase, the microemulsion structure became bi-continuous, and the conductivity continued to increase [ 42 , 43 ]. As the volume of NaCl continued to increase, the organic phase began to delaminate, at which point, the microemulsion structure shifted to a non-homogeneous phase, and the conductivity remained constant.…”

Section: Resultsmentioning

confidence: 99%

Separation of Palladium from Alkaline Cyanide Solutions through Microemulsion Extraction Using Imidazolium Ionic Liquids

Deng

Liu

et al. 2023

IJMS

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In this paper, three imidazolium-based ionic liquids, viz., 1-butyl-3-undecyl imidazolium bromide ([BUIm]Br), 1-butyl-3-octyl imidazolium bromide ([BOIm]Br), and 1-butyl-3-hexadecyl imidazolium bromide ([BCIm]Br), were synthesized. Three novel microemulsions systems were constructed and then were used to recover Pd (II) from cyanide media. Key extraction parameters such as the concentration of ionic liquids (ILs), equilibration time, phase ratio (RA/O), and pH were evaluated. The [BUIm]Br/n-heptane/n-pentanol/sodium chloride microemulsion system exhibited a higher extraction percentage of Pd (II) than the [BOIm]Br/n-heptane/n-pentanol/sodium chloride and [BCIm]Br/n-heptane/n-pentanol/sodium chloride microemulsion systems. Under the optimal conditions (equilibrium time of 10 min and pH 10), the extraction percentages of these metals were all higher than 98.5% when using the [BUIm]Br/n-heptane/n-pentanol/sodium chloride microemulsion system. Pd(CN)42− was separated through a two-step stripping procedure, in which Fe (III) and Co (III) were first separated using KCl solution, then Pd(CN)42− was stripped using KSCN solution (separation factors of Pd from Fe and Co exceeded 103). After five extraction–recovery experiments, the recovery of Pd (II) through the microemulsion system remained over 90%. The Pd (II) extraction mechanism of the ionic liquid [BUIm]Br was determined to occur via anion exchange, as shown by spectral analysis (UV, FTIR), Job’s method, and DFT calculations. The proposed process has potential applications for the comprehensive treatment of cyanide metallurgical wastewater.

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Section: Resultsmentioning

confidence: 99%

Separation of Palladium from Alkaline Cyanide Solutions through Microemulsion Extraction Using Imidazolium Ionic Liquids

Deng

Liu

et al. 2023

IJMS

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“…The application of magnetic resonance methods details the picture of the ME structure down to the molecular level. The observation of microemulsions by the SAD method is usually carried out in the variants of measuring the chemical shift of nuclei with a change in the component composition [34], measuring the magnetic relaxation times of nuclei (T1,T2) of surfactant molecules [35], determining the self-diffusion coefficients by the spin echo method [36] and quadrupole splitting of 2 H, 23 Na nuclei during the formation of anisotropic liquid crystal structures. Spectroscopy is sensitive to the chemical structure of surfactants.…”

Section: Incapsulation and Controlled Microenvironments: Structural I...mentioning

confidence: 99%

“… Changes in conductivity of AOT microemulsion system with water addition at different KCl concentrations [ 23 ]. …”

Section: Figurementioning

confidence: 99%

Nano- and Microemulsions in Biomedicine: From Theory to Practice

et al. 2023

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Nano- and microemulsions are colloidal systems that are widely used in various fields of biomedicine, including wound and burn healing, cosmetology, the development of antibacterial and antiviral drugs, oncology, etc. The stability of these systems is governed by the balance of molecular interactions between nanodomains. Microemulsions as a colloidal form play a special important role in stability. The microemulsion is the thermodynamically stable phase from oil, water, surfactant and co-surfactant which forms the surface of drops with very small surface energy. The last phenomena determines the shortage time of all fluid dispersions including nanoemulsions and emulgels. This review examines the theory and main methods of obtaining nano- and microemulsions, particularly focusing on the structure of microemulsions and methods for emulsion analysis. Additionally, we have analyzed the main preclinical and clinical studies in the field of wound healing and the use of emulsions in cancer therapy, emphasizing the prospects for further developments in this area.

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“…It is a “bi-hydrophobic” anionic surfactant composed of one hydrophilic group and two hydrophobic groups. Compared with those of “mono-hydrophobic” surfactants, AOT has excellent emulsification, wettability, and permeability. − AOT with two flexible alkyl tail chains were highly structurally variable at the oil/water interface and showed good synergistic effects when mixed with different surfactants. − Han et al measured the performance of AOT mixed with two betaines (ASB/BSB) in n -decane and crude oil and found that the mixed system could reduce the IFT of the n -decane system to an ultralow level.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Betaines and Dialkyl Chain Anionic Surfactants on Interfacial Arrangement: A Molecular Dynamics Simulation Study

Liu,

Xiao,

Pan

et al. 2024

Langmuir

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Mixed systems of betaines and anionic surfactants can have a significant synergistic effect and greatly reduce the interfacial tension (IFT), which has attracted an extensive amount of attention. However, this synergistic effect requires an anionic surfactant and betaine molecular size matching, which limits the scope of its application. In this work, we studied three mixed systems of sodium dialkyl sulfosuccinate (AOT) and betaines with different sizes by molecular dynamics simulation and an IFT experiment and explored the interfacial behavior and synergistic mechanism of AOT in single and mixed systems. The hydrophobic tail chain center angle, average rising height of carbon atoms, stretch degree and distance between the terminal carbon atoms of AOT, and tilt angles of betaine were calculated and analyzed in detail. Simulation results showed that the hydrophobic tail chain center angle of AOT in the single system was smaller, and it tended to extend into the oil phase. After being mixed with different betaines, AOT can adjust its size according to the interfacial vacancies of different betaine systems by changing the alkyl chain orientation and forming tighter interfacial films. The IFT experiment showed that betaine/AOT mixed systems achieved a lower IFT value compared with that of the single system, indicating that AOT showed a synergistic effect with betaines with different structures. This study will be importantly instructively significant for the design and research of betaine mixed systems in crude oil exploitation.

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Investigation of AOT/isooctane/water reverse microemulsion system with the presence of different mass ratios of SDS: Conductivity and water solubilization

Cited by 10 publications

References 72 publications

Separation of Palladium from Alkaline Cyanide Solutions through Microemulsion Extraction Using Imidazolium Ionic Liquids

Separation of Palladium from Alkaline Cyanide Solutions through Microemulsion Extraction Using Imidazolium Ionic Liquids

Nano- and Microemulsions in Biomedicine: From Theory to Practice

Synergistic Effect of Betaines and Dialkyl Chain Anionic Surfactants on Interfacial Arrangement: A Molecular Dynamics Simulation Study

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