Pseudophase Model in Microemulsions

Cid, Antonio; Acuña, A. Ulises; Alonso-Ferrer, Manuel; Astray, Gonzalo; García‐Río, Luis; Simal‐Gándara, Jesús; Mejuto, J. C.

doi:10.5772/intechopen.84295

Cited by 4 publications

(5 citation statements)

References 65 publications

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“…Cao et al [ 29 ] reported using an ionic surfactant, sodium di-2-ethyl hexyl sulfosuccinate [ 30 , 31 , 32 ] (AOT), to activate or charge PS nanoparticles of different sizes: 141, 311, and 535 nm. The behavior of nanoplastics showed that the PS/AOT/water system’s charging mechanism was adsorption-dominated, revealing the importance of the association between the activation of the particle surfaces and particle charging.…”

Section: Methodsmentioning

confidence: 99%

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Recent Advances in the Aggregation Behavior of Nanoplastics in Aquatic Systems

Cid-Samamed,

Diniz

2023

IJMS

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This short review aims to critically discuss the recent advances in supramolecular chemistry to achieve the aggregation of nanoplastics in aquatic systems. Polymer modification provides a vital tool for designing novel and ad hoc synthesized surfactants with properties tuned for some specific applications (e.g., stimuli-responsive nanomaterial, conducting polymers), mainly to aggregate other polymers from the environment. Far from the typical use of surfactants, which ease the dispersion of insoluble molecules in water media or aid solubilization of insoluble molecules on local media, in this case, nanoarchitectonics serve researchers to design surfactants with a focus on the capture of nanoplastics from the environment. Additionally, monovalent and divalent salt additions aided NPs in coagulating in the aquatic systems. Finally, the latest research on NPs’ removal efficiency on wastewater treatment plant is reviewed to summarize the advances.

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Section: Methodsmentioning

confidence: 99%

“…Cao et al [ 29 ] assessed the charge-mediating of PSNPs using AOT surfactant in aqueous solutions [ 30 , 31 , 32 ]. PSNPs were obtained with three different sizes: 141, 311, and 535 nm.…”

Section: Methodsmentioning

confidence: 99%

Recent Advances in the Aggregation Behavior of Nanoplastics in Aquatic Systems

Cid-Samamed,

Diniz

2023

IJMS

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“…Under a given (fixed) set of experimental conditions, an equilibrium is established between ions located in the interfacial region of the emulsion (bounded ions) and the remaining ions in the aqueous phase. This two-site model has been proved experimentally in micellar systems by employing different experimental techniques that quantitatively measure either bound-or free-ion concentrations [40][41][42][43] and should also be applicable to emulsions because emulsion droplets and micelles are present simultaneously and typically exchange material at diffusion-controlled rates [21,[44][45][46]. Thus, in emulsions formed with a surfactant with counterions X with charge Zx and containing other counterions Y with charge Zy, the equilibrium condition for each counterion requires that the electrochemical potentials of aqueous and bounded counterions be equal to each other, and the ion-exchange constant given by Equation (1) can be derived [13,15,43,47].…”

Section: An Overview Of the General Effects Of Charged Interfaces On ...mentioning

confidence: 99%

“…At cationic interfaces, the exchange is described by an empirical Donnan equilibrium constant between H + and Br − [41,42]. Within cationic interfaces, the interfacial H + concentration may be significantly lower, by one to two orders of magnitude, than the bulk [H + ].…”

Section: An Overview Of the General Effects Of Charged Interfaces On ...mentioning

confidence: 99%

Efficiency of δ-Tocopherol in Inhibiting Lipid Oxidation in Emulsions: Effects of Surfactant Charge and of Surfactant Concentration

2023

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Charged interfaces may play an important role in the fate of chemical reactions. Alterations in, for instance, the interfacial acidity of emulsions induced by the charge of the surfactant head group and associated counterions may change the ionization status of antioxidants, modifying their effective concentrations. The chemical reactivity between interfacial reactants and charged species of opposite charge (protons, metallic ions, etc.) is usually interpreted in terms of pseudophase ion-exchange models, treating the distribution of charged species in terms of partitioning and ion exchange. Here, we focus on analyzing the effects of charged interfaces on the oxidative stability of soybean oil-in-water (o/w) emulsions prepared with anionic (sodium dodecyl sulfate, SDS), cationic (cetyltrimethylammonium bromide, CTAB) and neutral (Tween 20) surfactants, and some of their mixtures, in the presence and absence of δ-tocopherol (δ-TOC). We have also determined the effective concentrations of δ-TOC in the oil, interfacial and aqueous regions of the intact emulsions. In the absence of δ-TOC, the relative oxidative stability order was CTAB < TW20 ~ TW20/CTAB < SDS. Surprisingly, upon the addition of δ-TOC, the relative order was SDS ≈ TW20 << TW20/CTAB < CTAB. These apparently surprising results can be rationalized in terms of the nice correlation that exists between the relative oxidative stability and the effective interfacial concentrations of δ-TOC in the various emulsions. The results emphasize the importance of considering the effective interfacial concentrations of antioxidants in interpreting their relative efficiency in emulsions.

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“…The compartmentalization of reactants in reverse micelles is a key aspect of their utility in various chemical and biochemical applications. The localization of reactants gives rise to catalytic effects on the rates of the reactions, thereby controlling the kinetics and mechanism of reactions (11)(12)(13)(14).…”

Section: Introductionmentioning

confidence: 99%

Effect of AOT/Heptane Reverse Micelles on Oxidation of Ferroin by Metaperiodate: Kinetic and Mechanistic Aspects

BODASİNGİ,

PULİPAKA,

KİLANA

2023

Journal of the Turkish Chemical Society Section A: Chemistry

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A kinetic study of the oxidation of Ferroin, [Fe(phen)3]2+ by metaperiodate (IO4-) has been carried out in AOT/heptane reverse micelles by changing W = ([H2O]/[AOT]) and AOT concentration. The reaction order is first order with respect to Ferroin, while zero order with respect to IO4-. The reaction rate is faster in aqueous medium compared to AOT reverse micelles by eight times. The oxidation rate increases with an increase in the value of W (at fixed surfactant concentration, [AOT]) and decreases with AOT concentration. The effect of W on rate is elucidated based on the low dielectric constant of the water pool. Berezin's pseudo-phase model has been applied to explain the effect of AOT on rate.

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Pseudophase Model in Microemulsions

Cited by 4 publications

References 65 publications

Recent Advances in the Aggregation Behavior of Nanoplastics in Aquatic Systems

Recent Advances in the Aggregation Behavior of Nanoplastics in Aquatic Systems

Efficiency of δ-Tocopherol in Inhibiting Lipid Oxidation in Emulsions: Effects of Surfactant Charge and of Surfactant Concentration

Effect of AOT/Heptane Reverse Micelles on Oxidation of Ferroin by Metaperiodate: Kinetic and Mechanistic Aspects

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