Aggregation behaviour of n-alkyl-β-d-glucopyranoside+water+alcohol mixtures

Enders, Sabine; Kahl, Heike

doi:10.1016/j.fluid.2007.07.038

Cited by 11 publications

(9 citation statements)

References 22 publications

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“…The effect of alcohol on the micellar solution is the subject of extensive experimental and theoretical investigations. 21,22 Rao and Ruckenstein 23 are the pioneers in applying the thermodynamic model for mixed micelle developed by Nagarajan for medium-chain alcohols. Alcohols can act as both cosolvents and cosurfactants.…”

Section: Introductionmentioning

confidence: 99%

Influence of temperature and organic solvents (isopropanol and 1,4-dioxane) on the micellization of cationic gemini surfactant (14-4-14)

2014

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The micellar properties of gemini surfactant, tetramethylene-1,4-bis(dimethyltetradecylammonium bromide) (14-4-14) in binary aqueous mixtures of isopropanol (IP) and 1,4-dioxane (DO) were investigated by tensiometric, conductometric and microcalorimetric methods in the temperature range of 298 to 323 K. The values of both critical micelle concentration (cmc) and degree of dissociation increase with increasing temperature and concentration of cosolvent. The energetics of micellization was determined from the temperature dependence of critical micelle concentration values. The standard Gibbs free energy of micellization (ΔG) was found to be negative and the negative value decreases with both temperature and concentration of cosolvent. The Gibbs free energy of micellization (ΔG) is mainly controlled by tail transfer free energy. The enthalpy of micellization obtained from direct calorimetry, Gibbs-Helmholtz equation and van't Hoff methods are presented and compared. Entropic contribution is found to be larger than the enthalpy and for all the systems, an enthalpy-entropy compensation phenomenon was obtained. Some interfacial parameters, e.g., Gibbs surface excess (Γmax), minimum area per surfactant molecule (Amin), surface pressure (Πcmc) were been calculated. The fluorimetric technique was used to understand the microenvironment of the solution under the influence of cosolvent. The micellar aggregation number of 14-4-14 in a binary mixed solvent was also determined from fluorimetry using pyrene as a probe. Two fluorophores, fluorescein and curcumin delivered the information of the peripheral region of the micellar interface and palisade region. The self-diffusion coefficients of the micellar media were evaluated using the cyclic voltammetry (CV) method. Such multi-technique investigation provides a new look into the role of solvation in micellization.

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Section: Introductionmentioning

confidence: 99%

Influence of temperature and organic solvents (isopropanol and 1,4-dioxane) on the micellization of cationic gemini surfactant (14-4-14)

2014

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“…The development of ordered mesophases with single hydrocarbon chain amphiphiles requires appropriate lyotropic liquid crystalline (LLC) phases in solution. 29 In our system, although the initial surfactant concentration is clearly above the critical micellar concentration of both C 10 M and C 12 M, 30,31 it is far below the concentration needed for LLC formation (typically in the range 25-30 wt%). 24 However, during the synthesis this limit is surpassed due to evaporation of ethanol, and the precipitated composite enriches with siliceous species, surfactant and water, inducing the supramolecular surfactant-silica co-assembly.…”

Section: Synthesis Of Ordered Mesoporous Silicamentioning

confidence: 75%

Synthesis of ordered mesoporous silica templated with biocompatible surfactants and applications in controlled release of drugs

2012

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A novel series of mesoporous silica materials has been developed by using non-ionic, biocompatible alkyl maltoside surfactants as organic structure directing agents and working under biomimetic conditions (e.g., room temperature and almost neutral pH) to avoid modifications of potential drugs occluded within. The obtained mesophases were tuned by changing the template and its concentration. These sugar surfactant-silica platforms were used as drug delivery carriers for ibuprofen, by encapsulating drug molecules within the hydrophobic core of the template micelles. The obtained surfactant-assisted delivery systems constitute a new approach towards controlled release of small therapeutic molecules.

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“…The classical aggregation model , was already applied for the prediction of thermodynamic properties of sugar surfactants − and of the influence of added alcohol . They could predict the formation of spherical bilayer vesicles caused by the large polar headgroup of the sugar surfactant, − the CMC, as well as the average aggregation number in satisfactory agreement with experimental data. − It turned out that the different contributions of the model have a differently strong impact on the predicted physical properties. − The most important contribution forcing the self-assembly is the transfer term, and the most important opponent is the repulsion of the polar head groups in the corona. − …”

Section: Introductionmentioning

confidence: 90%

Application of PC-SAFT and DGT for the Prediction of Self-Assembly

Reinhardt¹,

Haarmann

Sadowski

et al. 2020

J. Chem. Eng. Data

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The self-assembly of a surfactant in water is a complex procedure. The classical thermodynamic model for aqueous solutions of a nonionic surfactant, originally developed by Nagarajan and Ruckenstein, includes four contributions for aqueous solutions of a nonionic surfactant. These contributions were calculated using correlations based on experimental data, which were available at that time. The most important contribution is the so-called transfer term for modeling the hydrophobic effect. In this work, we first suggest replacing the original term based on experimental vapor–liquid equilibrium data by the n-alkane activity coefficient at infinite dilution in water calculated with PC-SAFT. The second term in the original model describes the newly formed interface during the self-assembly. This contribution requires the interfacial tension of n-alkane + water mixtures, which was originally calculated using combining rules based on the surface tensions of pure water and pure n-alkane. The second new suggestion of this work is to replace this combining rule by the interfacial tension of n-alkane + water mixtures obtained from PC-SAFT combined with the density gradient theory. The impact of these modifications on the predicted physical properties of surfactant solutions is studied for aqueous solutions of n-octyl-β-d-glucopyranoside (C8G1) as a representative surfactant for the family of sugar surfactants.

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Aggregation behaviour of n-alkyl-β-d-glucopyranoside+water+alcohol mixtures

Cited by 11 publications

References 22 publications

Influence of temperature and organic solvents (isopropanol and 1,4-dioxane) on the micellization of cationic gemini surfactant (14-4-14)

Influence of temperature and organic solvents (isopropanol and 1,4-dioxane) on the micellization of cationic gemini surfactant (14-4-14)

Synthesis of ordered mesoporous silica templated with biocompatible surfactants and applications in controlled release of drugs

Application of PC-SAFT and DGT for the Prediction of Self-Assembly

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