Spherical and Rod SDS Micelles

Coello, Adela; Meijide, Francisco; Mougan, Manuel A.; Núñez, Eugenio Rodríguez; Tato, José Vázquez

doi:10.1021/ed072p73

Cited by 10 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As reported by previous literature, SDS (the critical aggregation concentration value ∼8.00 × 10 –3 M) as a surfactant self-assembled into micelles, which was confirmed by DLS and TEM experiments (Figure a,b). Intriguingly, 2 ⊃SDS served as a supramolecular amphiphile with the pillar[5]arene head as the hydrophilic portion and the alkyl chain on SDS as the hydrophobic part.…”

supporting

confidence: 87%

CO₂-Responsive Pillar[5]arene-Based Molecular Recognition in Water: Establishment and Application in Gas-Controlled Self-Assembly and Release

et al. 2015

View full text Add to dashboard Cite

Here we developed a novel CO2-responsive pillararene-based molecular recognition motif established from a water-soluble pillar[5]arene and an anionic surfactant, sodium dodecyl sulfonate (SDS). The inclusion complex acted as a supramolecular amphiphile and self-assembled into spherical bilayer vesicles as confirmed by DLS, SEM, and TEM experiments. These vesicles were disrupted upon bubbling N2 or adding much more SDS to eliminate the inclusion complex. The assembly and disassembly of vesicles were successfully employed in gas and surfactant triggered releases of calcein, a water-soluble dye.

show abstract

supporting

confidence: 87%

CO₂-Responsive Pillar[5]arene-Based Molecular Recognition in Water: Establishment and Application in Gas-Controlled Self-Assembly and Release

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Steady-state fluorescence measurements were recorded on a Perkin-Elmer model 650-40. A Hitachi (model F-3010) was used to measure the static light scattering; the technique has been described elsewhere …”

Section: Methodsmentioning

confidence: 99%

Aggregation Kinetics of Sodium Deoxycholate in Aqueous Solution

et al. 1998

View full text Add to dashboard Cite

The aggregation kinetics of sodium deoxycholate in aqueous solution has been studied at pH values close to neutrality. An induction time is observed and taken as inversely proportional to the rate constant for the aggregation of two small aggregates to form a larger one but one that is smaller than a critical size. When the critical size is reached, the length of the polymer-like structure allows the entanglement of the aggregates, accounting for the gel behavior of the solution. After the induction time, it is observed that the weight average aggregation number increases linearly with time for more than 50% of the aggregation. This is analyzed through the Smoluchowski equation in its simplest form. The influence of the temperature on the kinetics suggests the existence of a kinetic-thermodynamic relationship. It is deduced that the aggregation rate is limited by physical interactions, and the role of hydrogen bond in the aggregation rate is discussed. The influences of pH and phosphate concentration are also studied and discussed.

show abstract

“…In the presence of ILs the micelles should be slightly bigger, but the structure of ILs does not have an expressed influence on n. For SDS in 0.1 M NaCl aqueous solutions the highest n was estimated, supporting the reported sphere-rod transition. 42,43 The micellization process is endothermic at low temperatures and exothermic at higher temperatures, as it is evident from Figure 2b and Table S1 in Supporting information. Similar behaviour has already been observed at micellization process of alkyltrimethylammonium chlorides in water and aqueous solutions of NaCl or hydroxybenzoates.…”

Section: Resultsmentioning

confidence: 88%

“…It is also interesting that after cmc all the ζ-potential values are monotonically decreasing with SDS concentration except in the case of SDS in 0.1 M NaCl solutions where it is almost constant throughout the whole concentration range of SDS. Here it has to be emphasized that at high concentrations of the additives the SDS could form cylindrical or rod-like micelles 42,43 which makes the interpretation of ζ-potential dubious and needs further exploration. For example, if we employ function f(ka) for cylindrical micelles 36 in equation (1) we obtain ζ-potential around -100 mV for 20 mM SDS in 0.1 M NaCl.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Ionic Liquids on Micellization of Sodium Dodecyl Sulfate in Aqueous Solutions

Šarac

Bešter‐Rogač

2020

ACSi

View full text Add to dashboard Cite

The micellization of sodium dodecyl sulfate (SDS) in water and in aqueous solutions of three imidazolium based ionic liquids with different side-chain length, i.e. 1,3-dimethylimidazolium chloride ([C 1 mim]Cl), 1-ethyl-3-methylimidazolium chloride ([C 2 mim]Cl), and 1-butyl-3-methylimidazolium chloride ([C 4 mim]Cl) was investigated by isothermal titration calorimetry (ITC) in the temperature range from 288.15 to 328.15 K. For comparison, the micellization of SDS in the presence of NaCl was studied also. ITC experimental data were analysed by the two-state mass-action model, yielding the values of critical micelle concentration (cmc), aggregation number (n), standard heat capacity (∆ M c p°) , enthalpy (∆ M H°), entropy (∆ M S°), and Gibbs free energy (∆ M G°) of the micellization process. It was found that the micellization of SDS in all the studied systems is an entropy-driven at lower temperatures and an enthalpy-driven at higher temperatures. In addition, it was assumed that with the increasing nonpolar character of IL, the interactions between the SDS are stronger, leading to more negative values of ∆ M H° and ∆ M G°. To obtain more information about the micellar charge, the conductivity and zeta-potential measurements were performed at 298.15 K. Presumably the micellar charge is more positive in the presence of ILs due to their stronger interaction and possible incorporation into the micellar structure. This reflects in less negative zeta-potential comparing to SDS in water and consequently higher degrees of micelle ionization due to the larger portion of sodium ions in solution.

show abstract

Spherical and Rod SDS Micelles

Abstract: Experimental procedure using light-scattering intensity measured with a spectrofluoroimeter to determine micellar molecular weight, shape, and dimensions; includes data and analysis.

Cited by 10 publications

References 14 publications

CO₂-Responsive Pillar[5]arene-Based Molecular Recognition in Water: Establishment and Application in Gas-Controlled Self-Assembly and Release

CO₂-Responsive Pillar[5]arene-Based Molecular Recognition in Water: Establishment and Application in Gas-Controlled Self-Assembly and Release

Aggregation Kinetics of Sodium Deoxycholate in Aqueous Solution

The Influence of Ionic Liquids on Micellization of Sodium Dodecyl Sulfate in Aqueous Solutions

Contact Info

Product

Resources

About

Spherical and Rod SDS Micelles

Abstract: Experimental procedure using light-scattering intensity measured with a spectrofluoroimeter to determine micellar molecular weight, shape, and dimensions; includes data and analysis.

Cited by 10 publications

References 14 publications

CO2-Responsive Pillar[5]arene-Based Molecular Recognition in Water: Establishment and Application in Gas-Controlled Self-Assembly and Release

CO2-Responsive Pillar[5]arene-Based Molecular Recognition in Water: Establishment and Application in Gas-Controlled Self-Assembly and Release

Aggregation Kinetics of Sodium Deoxycholate in Aqueous Solution

The Influence of Ionic Liquids on Micellization of Sodium Dodecyl Sulfate in Aqueous Solutions

Contact Info

Product

Resources

About

CO₂-Responsive Pillar[5]arene-Based Molecular Recognition in Water: Establishment and Application in Gas-Controlled Self-Assembly and Release

CO₂-Responsive Pillar[5]arene-Based Molecular Recognition in Water: Establishment and Application in Gas-Controlled Self-Assembly and Release