Ion binding and reactivity at charged aqueous interfaces

Bunton, Clifford A.; Nome, Faruk; Quina, Frank H.; Romsted, Laurence S.

doi:10.1021/ar00012a001

Cited by 698 publications

(670 citation statements)

References 47 publications

Supporting

Mentioning

619

Contrasting

Unclassified

Order By: Relevance

“…The interaction of metal ions with anionic surfactants in aqueous solutions is of both theoretical [2][3][4][5][6] and practical [7,8] importance. Over the last decades, there have been a considerable number of scientific reports regarding the interaction between mono-or higher valent ions and ionic surfactants, with particular attention to the phase separation which occurs in these systems [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The interaction of long chain sodium carboxylates and sodium dodecylsulfate with lead(II) ions in aqueous solutions

Pereira¹,

Valente²

2014

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

The interaction of sodium octanoate, decanoate or dodecanoate with lead(II) has been studied in aqueous solutions using potentiometry, electrical conductivity, turbidity and ICP-OES measurements. These show an alkyl chain length dependence on the behaviour. At the lead(II) concentration used (1.0 mM), relatively strong interactions are observed with the decanoate and dodecanaote, leading to formation of the lead carboxylates (soaps) as insoluble complexes. Association constants of the complexes have been determined from potentiometric measurements and are consistent with data on solubility products. A comparison is made of the effect of surfactant head group on the interactions with lead(II) using two surfactants with the same chain length: dodecanoate and dodecylsulfate. Differences in their interactions with this metal ion in aqueous solutions are interpreted in terms of greater covalency of the bond between the metal and the carboxylate than with the sulfate group.

show abstract

Section: Introductionmentioning

confidence: 99%

The interaction of long chain sodium carboxylates and sodium dodecylsulfate with lead(II) ions in aqueous solutions

Pereira¹,

Valente²

2014

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

show abstract

“…where C aq may be found from the conventional pseudophase ion exchange mass balance relationship: 14 where C, C free , and C ad are the molar concentrations of total surfactant, surfactant in free monomer form, and added counterion in the form of salt, respectively. The factor 1/(1 -VC) ≡ F(C), where V is the molar volume of the surfactant, takes into account the excluded volume of the micelles as previously discussed.…”

Section: Introductionmentioning

confidence: 99%

Aggregation Number-Based Degrees of Counterion Dissociation in Sodium n-Alkyl Sulfate Micelles

2005

View full text Add to dashboard Cite

Values of the degree of counterion dissociation, R, for sodium n-alkyl sulfate micelles, denoted by SN c S, where N c is the number of carbon atoms in the alkyl chain, are defined by asserting that the aggregation number, N, is dependent only on the concentration, C aq , of counterions in the aqueous pseudophase. By using different combinations of surfactant and added salt concentrations to yield the same value of N, R can be determined, independent of the experimental method. Electron paramagnetic resonance measurements of the hyperfine spacings of two nitroxide spin probes, 16-and 5-doxylstearic acid methyl ester (16DSE and 5DSE, respectively), are employed to determine whether micelles from two samples have the same value of N to high precision. The EPR spectra are different for the two spin probes, but the values of R are the same, within experimental error, as they must be. In agreement with recent work on S12S and with prevailing thought in the literature, values of R are constant as a function of N. This implies that the value of R is constant whether the surfactant or added electrolyte concentrations are varied. Interestingly, R varies with chain length as follows: However, the theory also predicts that, for a given value of N c , R decreases as N increases. Moreover, this decrease is predicted to be different if N is increased by adding salt or by increasing the surfactant concentration. A modification to the theory in which dissociated counterions contribute to the ionic strength while added co-ions (Cl -) do not, brings theory and experiment into closer accord. Assuming R to be constant versus N permits a direct application of the aggregation number-based definition of R using time-resolved fluorescence quenching to measure values of N as well as other experimental parameters that vary monotonically with N, such as the microviscosity measured with spin probes and the quenching rate constant. For S13S micelles at 40°C, R ) 0.20 ( 0.02 is derived from N; R ) 0.21 ( 0.02 from the microvisicosity, and R ) 0.21 ( 0.02 from the quenching rate constants, in agreement with the hyperfine spacing results. The aggregation numbers for S13S are well described by the power law N ) N°(C aq /cmc 0 ) γ , where cmc 0 is the critical micelle concentration in the absence of added salt, N°) 67, and γ ) 0.26.

show abstract

“…The dynamic nature of the intermolecular interactions in reverse micelle implies, for instance, that the Stern layer containing surfactant head groups, counter-ions, and water will have properties intermediate between those of water and hydrocarbon. 115 Moreover, the diffuse electrical double-layer that is formed extends into the aqueous phase, leading to spatial heterogeneity. Thus, the major problem in understanding solvation dynamics in reverse micelles is properly describing interfacial concentrations and distributions.…”

Section: Surfactant Assembliesmentioning

confidence: 99%

Ultrafast dynamics of solvation: the story so far

Nome¹

2010

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

A presença de moléculas de solvente na vizinhança de um soluto afeta uma variedade de processos em química e biologia, e por isso é interessante obter uma descrição física de como funciona a solvatação. Embora existam muitas ferramentas espectroscópicas estruturalmente sensíveis para a investigação do papel de moléculas de solvente em processos químicos, a medida em tempo real da dinâmica de solvatação somente tornou-se possível após o desenvolvimento de espectroscopias a laser pulsado com resolução temporal de femtossegundos. Esta revisão descreve aplicações da espectroscopia ultra-rápida ao estudo da dinâmica de solvatação. A nível de terceira ordem, discutimos a dinâmica de solvatação com técnicas ressonantes e não-ressonantes, com um foco no estudo de líquidos simples e complexos. Espectroscopias Raman de quinta ordem também são apresentadas, sendo que o enfoque dá-se no novo entendimento que estas técnicas fornecem com relação ao papel do solvente em reações químicas e à natureza anarmônica do estado líquido.The presence of solvent molecules in the vicinity of a solute affects a variety of processes in chemistry and biology, and thus one would like to have a physical picture of how solvation works. Although there are many structurally sensitive spectroscopic tools to investigate the role of solvent molecules in chemical processes, real time measurements of the dynamics of solvation had to wait for the development of pulsed laser spectroscopies with femtosecond time-resolution. This review describes applications of ultrafast spectroscopy to the study of solvation dynamics. At third order, we review resonant and non-resonant probes of solvation dynamics, with a focus on the study of simple and complex liquids. Fifth-order Raman spectroscopies are also reviewed, focusing on the insights these techniques give into the role of the solvent in chemical reactions and the anharmonic nature of the liquid state.

show abstract

Ion binding and reactivity at charged aqueous interfaces

Cited by 698 publications

References 47 publications

The interaction of long chain sodium carboxylates and sodium dodecylsulfate with lead(II) ions in aqueous solutions

The interaction of long chain sodium carboxylates and sodium dodecylsulfate with lead(II) ions in aqueous solutions

Aggregation Number-Based Degrees of Counterion Dissociation in Sodium n-Alkyl Sulfate Micelles

Ultrafast dynamics of solvation: the story so far

Contact Info

Product

Resources

About