A Study of the Surface pH of Micelles Using Solubilized Indicator Dyes

Mukerjee, Pasupati; Banerjee, Kalyan

doi:10.1021/j100794a022

Cited by 167 publications

(86 citation statements)

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“…As reported earlier [20,35], in micellar solution the dependences of app a pK on log I (or more precisely log c counterion ) are linear up to several mol per liter. The slope of dependences, b, is in fact very similar to the degree of counterion binding, β, by colloidal particles:…”

Section: Dls Measurementssupporting

confidence: 71%

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Influence of the Ionic and Non-Ionic Additives on the Acid Strength of Neutral Red in the Aqueous Solutions of Poly (Sodium 4-Styrenesulfonate)

Moskaeva¹

2017

Chemical

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Polyions of poly (sodium 4-styrenesulfonate) in aqueous solution may be considered as colloidal pseudophase. Analogously to micelles, some species can be bind by the charged polyelectrolyte coils. In this paper, the colored acid-base indicator dyes were used for studying the penetration of ionic and non-ionic solution components in polyelectrolyte coils. Such analysis relies on alteration of the acid strength of dyes. The aim of this work was to determine the dependences of the apparent ionization constants of neutral red, app a K , on the ionic strength of solution, I, in different mixed systems containing poly (sodium 4-styrenesulfonate) (NaPSS) and tetraethylammonium bromide, tetra-n-butylammonium iodide, or 1-butanol with NaCl. Neutral red is fixed in the polyelectrolyte coils due to electrostatic and hydrophobic interactions. The polyelectrolyte : dye concentration ratio, P : D, an important parameter for spectophotometrical measurements, equals 100. It was found that tetra-n-alkylammonium salts display a stronger influence on the acid strength of neutral red as compared with that of NaCl. For instance, in the case of tetraethylammonium bromide app a pK = 7.90 ± 0.07 at I = 0.02 M whereas app a pK = 8.45 ± 0.04 with NaCl at the same ionic strength. It can be explained by specifical adsorption tetra-n-alkylammonium cations on polyions 'surface'. Introduction of 1-butanol significantly increases the acid strength of neutral red too, however its influence isn't monotonic with change of ionic strength. The dependences of app a pK on log I were discussed in terms of regularities which are well-known for surfactant micellar systems. All mentioned systems were also examined by dynamic light scattering measurements using Zetasizer Nano ZS Malvern Instruments apparatus. As it turned out, when the ionic strength is 3×10 -3 М or more the size (by number) of polyions in the presence of NaCl is of about 7 nm. Introduction of the additives results in somewhat higher size: in the case of 1-butanol the size of NaPSS is 10 nm.

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Section: Dls Measurementssupporting

confidence: 71%

“…In micellar systems, this parameter is usually determined by conductivity or potentiometry methods [16][17][18][19]. Equally with these methods, the acid-base indicator method is known for a long time [10,20]. The counterion binding by polyions is also the object of research.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Ionic and Non-Ionic Additives on the Acid Strength of Neutral Red in the Aqueous Solutions of Poly (Sodium 4-Styrenesulfonate)

Moskaeva¹

2017

Chemical

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“…They are grouped together since they often involve problems of carbon dioxide contamination as well as salt bridges. 9. Other bulk properties that have been used to determine CMC's are density (23) based generally on magnetic float methods plotted directly as DENSITY (17) or after conversion to PARTIAL VOLUME (6) and ultrasonic VELOCITY OF SOUND (10 Other dyes which have been used in this method are Fluorescein -FL (2), Erythrosin -ERTS (7), dichlorofluorescein -DCLF (9), Benzopurpurine 4B -BZP4 (11), Bromphenol Blue -BRPB (21), Skyblue FF -SKYB (43), Eosin -EOSN (51), Indophenol -INPX (129) and, included because it performs the same function although not a dye in the strict sense, Iodine -12 (52). There is also unspecified VISUAL SPECTR CHNGE (27).…”

Section: (C)mentioning

confidence: 99%

“…These may be used with high confidence. 10 percent of all the entries, and they represent the next most reliable group after (1) and (2 [26][27][28] and the concept of micelles in such solutions had been developed by McBain and coworkers [29, 30], the existence of a narrow concentration range, called "the critical concentration for micelles" [31], below which the solution contains negligible amounts of micelles and above which practically all additional surfactant is found in the form of additional micelles, was established by Bury and his coworkers [31,32] and Hartley and his coworkers [33] (18) -in which case the curvature of the descending portion is much more marked and the transition less sharp. A MINIMUM (15) in the curve is now known to be due to the presence of a third component ( (6).…”

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confidence: 99%

Critical micelle concentrations of aqueous surfactant systems

Mukerjee¹,

Mysels²

1971

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1,402

119

991

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“…In truth, this discussion is similar to proton association/dissociation from/to a amphiphilic molecule of a micelle. The classical works of Mukerjee and Banerjee (1964) and Fernández and Fromherz (1977) suggested a relative simple equation to measure ΔpK based only on the electrostatic interactions and neglecting nonelectrostatic interactions. They also left for debate a fundamental problem: the correct measurement of pK 0 (the reference dissociation constant).…”

Section: Titration Schemes Based On the Monte Carlo Methodsmentioning

confidence: 99%

Development of constant-pH simulation methods in implicit solvent and applications in biomolecular systems

daSilva

Dias

2017

Biophys Rev

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pH is a critical parameter for biological and technological systems directly related with electrical charges. It can give rise to peculiar electrostatic phenomena, which also makes them more challenging. Due to the quantum nature of the process, involving the forming and breaking of chemical bonds, quantum methods should ideally by employed. Nevertheless, due to the very large number of ionizable sites, different macromolecular conformations, salt conditions, and all other charged species, the CPU time cost simply becomes prohibitive for computer simulations, making this a quite complex problem. Simplified methods based on Monte Carlo sampling have been devised and will be reviewed here, highlighting the updated state-ofthe-art of this field, advantages, and limitations of different theoretical protocols for biomolecular systems (proteins and nucleic acids). Following a historical perspective, the discussion will be associated with the applications to protein interactions with other proteins, polyelectrolytes, and nanoparticles.

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A Study of the Surface pH of Micelles Using Solubilized Indicator Dyes

Cited by 167 publications

References 0 publications

Influence of the Ionic and Non-Ionic Additives on the Acid Strength of Neutral Red in the Aqueous Solutions of Poly (Sodium 4-Styrenesulfonate)

Influence of the Ionic and Non-Ionic Additives on the Acid Strength of Neutral Red in the Aqueous Solutions of Poly (Sodium 4-Styrenesulfonate)

Critical micelle concentrations of aqueous surfactant systems

Development of constant-pH simulation methods in implicit solvent and applications in biomolecular systems

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