Charge transfer complex formation between TX-100/CCl<sub>4</sub>reverse micelle and a series of π-electron acceptors: determination of cmc and aggregation number

Deb, Nipamanjari; Bagchi, Sanjib; Mukherjee, Asok K.

doi:10.1080/00268971003762126

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…The nature of inverse micellization is different in nonpolar solvents compared to polar solvents, and this had caused several authors to refer to the critical micellization concentration measured as either the ''reverse'' CMC 79,[84][85][86] or the ''operational'' CMC. 83,[87][88][89][90][91] Several authors have even asserted that while aggregation does occur in nonaqueous solvents that there is no sharp transition from a monomeric to a micellar regime and that there is no CMC in these systems. 92,93 Altogether, this indicates the concept of inverse micellization and the existence of a critical onset concentration is not as wellunderstood or clear as in polar solvents.…”

Section: Inverse Micellesmentioning

confidence: 99%

Controlling colloid charge in nonpolar liquids with surfactants

Smith

Eastoe

2013

Phys. Chem. Chem. Phys.

100

146

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The formation of ions in nonpolar solvents (with relative permittivity ε r of approximately 2) is more difficult than in polar liquids; however, these charged species play an important role in many applications, such as electrophoretic displays. The low permittivities (ε r) of these solvents mean that charges have to be separated by large distances to be stable (approximately 28 nm or 40 times that in water). The inverse micelles formed by surfactants in these solvents provide an environment to stabilize ions and charges. Common surfactants used are sodium dioctylsulfosuccinate (Aerosol OT or AOT), polyisobutylene succinimide, sorbitan oleate, and zirconyl 2-ethyl hexanoate. The behavior of charged inverse micelles has been studied on both the bulk and on the microscopic scale and can be used to determine the motion of the micelles, their structure, and the nature of the electrostatic double layer. Colloidal particles are only weakly charged in the absence of surfactant, but in the presence of surfactants, many types, including polymers, metal oxides, carbon blacks, and pigments, have been observed to become positively or negatively charged. Several mechanisms have been proposed as the origin of surface charge, including acid-base reactions between the colloid and the inverse micelle, preferential adsorption of charged inverse micelles, or dissolution of surface species. While most studies vary only the concentration of surfactant, systematic variation of the particle surface chemistry or the surfactant structure have provided insight into the origin of charging in nonpolar liquids. By carefully varying system parameters and working to understand the interactions between surfactants and colloidal surfaces, further advances will be made leading to better understanding of the origin of charge and to the development of more effective surfactants.

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Section: Inverse Micellesmentioning

confidence: 99%

Controlling colloid charge in nonpolar liquids with surfactants

Smith

Eastoe

2013

Phys. Chem. Chem. Phys.

100

146

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“…Among numerous methods (adsorption, precipitation, solvent extraction, liquid membrane transport), transport of cations through the liquid membranes attracts attention of numerous researchers, as new separation process based on solvent extraction [1][2][3][4][5]. Driving force of transport process is diffusion of analytes from higher concentration solution to lower concentration solution, through the liquid membrane, with a suitable carrier [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous researchers concluded that the nature of cation and the nature of ligand (the cavity size, number and orientation of the donor atoms) determine the interactions between them [1, 4,5,8]. Recently, there have been some studies of selective membrane transport for different cations using neutral ionophores [1][2][3][4][5]. The bulk liquid membrane systems contain three physically separated phases: two aqueous and one non-aqueous.…”

Section: Introductionmentioning

confidence: 99%

Study of Competitive Behavior of Cd(II) and Pb(II) Ions Through a Bulk Liquid Membrane

Suljkanović

Suljagić

2018

CSIJ

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Micellar catalysis on picolinic acid promoted hexavalent chromium oxidation of glycerol

Ghosh

Basu

Saha

et al. 2012

Journal of Coordination Chemistry

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Under pseudo-first-order conditions, monomeric Cr(VI) was found to be kinetically active in the absence of picolinic acid (PA), whereas in the PA-promoted path, the Cr(VI)-PA complex undergoes nucleophilic attack by the substrate to form a ternary complex which subsequently experiences redox decomposition, leading to glyceraldehydes and Cr(IV)-PA complex. The uncatalyzed path shows a second-order dependence on [H þ ], whereas the PA-catalyzed path shows zero-order dependence on [H þ ]. Both the uncatalyzed and PA-catalyzed path show a first-order dependence on [glycerol] T and [Cr(VI)] T . The PA-catalyzed path is first order in [PA] T . All these observations remain unaltered in the presence of externally added surfactants. The effect of the cationic surfactant cetyl pyridinium chloride (CPC) and anionic surfactant sodium dodecyl sulfate (SDS) on the PA-catalyzed path have been studied. CPC inhibits, whereas SDS accelerates the reaction. Here, SDS is a catalyst for glyceraldehydes production and at the same time reduction of carcinogenic hexavalent chromium to nontoxic trivalent chromium. The reaction proceeds simultaneously in both aqueous and micellar phase. Micellar effects have been explained by considering the preferential partitioning of reactants between the micellar and aqueous phase. The Menger-Portnoy model, Piszkiewicz cooperative model, and pseudo-phase ion exchange model have been tested to explain the observed micellar effect.

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Charge transfer complex formation between TX-100/CCl₄reverse micelle and a series of π-electron acceptors: determination of cmc and aggregation number

Cited by 6 publications

References 27 publications

Controlling colloid charge in nonpolar liquids with surfactants

Controlling colloid charge in nonpolar liquids with surfactants

Study of Competitive Behavior of Cd(II) and Pb(II) Ions Through a Bulk Liquid Membrane

Micellar catalysis on picolinic acid promoted hexavalent chromium oxidation of glycerol

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Charge transfer complex formation between TX-100/CCl4reverse micelle and a series of π-electron acceptors: determination of cmc and aggregation number

Cited by 6 publications

References 27 publications

Controlling colloid charge in nonpolar liquids with surfactants

Controlling colloid charge in nonpolar liquids with surfactants

Study of Competitive Behavior of Cd(II) and Pb(II) Ions Through a Bulk Liquid Membrane

Micellar catalysis on picolinic acid promoted hexavalent chromium oxidation of glycerol

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Charge transfer complex formation between TX-100/CCl₄reverse micelle and a series of π-electron acceptors: determination of cmc and aggregation number