Interactions of phenol with cationic micelles of hexadecyltrimethylammonium bromide studied by titration calorimetry, conductimetry, and 1H NMR in the range of low additive and surfactant concentrations
| Autor: | Radhouane Chaghi, Louis-Charles de Ménorval, Jerzy Zajac, Gaelle Derrien, Clarence Charnay |
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| Přispěvatelé: | Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Enthalpy
Inorganic chemistry 02 engineering and technology Calorimetry 010402 general chemistry 01 natural sciences Micelle Biomaterials chemistry.chemical_compound Surface-Active Agents Colloid and Surface Chemistry Pulmonary surfactant Phenol–micelle interactions Organic chemistry Phenol Conductimetry 1H NMR spectroscopy Nuclear Magnetic Resonance Biomolecular Micelles Aqueous solution Hexadecyltrimethylammonium micelles Chemistry Cetrimonium Electric Conductivity [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Titration calorimetry Phenol solubilization loci Solubility Proton NMR Cetrimonium Compounds Thermodynamics Titration Protons Micellar solubilization 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science Journal of Colloid and Interface Science, Elsevier, 2008, 326 (1), pp.227-234. ⟨10.1016/j.jcis.2008.07.035⟩ |
| ISSN: | 0021-9797 1095-7103 |
| DOI: | 10.1016/j.jcis.2008.07.035⟩ |
| Popis: | Interactions of phenol (PhOH) with micellar aggregates of hexadecyltrimethylammonium bromide (HTAB) in aqueous solutions at surfactant concentrations close to the CMC and phenol contents of 1, 5, or 10 mmol kg −1 have been investigated at 303 K by means of titration calorimetry, solution conductimetry, and 1 H NMR spectroscopy. Estimates of the main thermodynamic parameters related to HTAB micellization were made for PhOH/HTAB/H 2 O systems based on the specific conductivity measurements and calorimetric determination of the cumulative enthalpy of dilution as functions of the surfactant concentration at a fixed additive content. The combined analysis of the results obtained in H 2 O solutions pointed to the preferential location of PhOH in the outer micelle parts by an enthalpy-driven mechanism. Additional PhOH molecules were located increasingly deeper within the micelle core. The 1 H NMR study of PhOH solubilization by 1.5 mmol kg −1 HTAB solutions in D 2 O indicated that the two categories of the solubilization site became saturated with the solubilizate already at the lowest additive content. Dissimilar amounts of the solubilized material in H 2 O and D 2 O solutions were ascribed to the difference in the initial micelle structures formed in the two solvents, as inferred from calorimetry and 1 H NMR studies of the HTAB micellization in D 2 O and H 2 O. |
| Databáze: | OpenAIRE |
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