| Full text | |
| Author(s): |
Patino-Agudelo, lvaro Javier
;
Ueti, Larissa de Almeida
;
Trindade, Suelen Gauna
;
da Silva, Laura C. E.
;
Sabadini, Edvaldo
Total Authors: 5
|
| Document type: | Journal article |
| Source: | Journal of Colloid and Interface Science; v. 694, p. 8-pg., 2025-04-28. |
| Abstract | |
Hypothesis: Variation of entropy is the primary driving force behind the formation of wormlike micelles of tetradecyltrimethylammonium p-halogenobenzoates. However, as the atomic number of the halogen substituent increases, the enthalpy become progressively more relevant, as the entropy remains constant and independent of the halogen substituent. Experiments: In this study, electrical conductivity, isothermal titration calorimetry, cryogenic transmission electron microscopy, and small-angle X-ray scattering were employed to investigate the formation of wormlike micelles made up of tetradecyltrimethylammonium p-X-benzoates (where X = -H, -F, -Cl, -Br, or -I) approaching their onset concentration limits at 298.2 K. Findings: Our discoveries indicate that the thermodynamic stability of wormlike micelles (Delta GoWLM) increases with the polarizability of the halogen counterion, primarily due to enhanced dispersive interactions between the surfactant and the counterion in the aggregated state. For all five complex salts, the entropic contribution (T Delta SoWLM) is comparable, suggesting that desolvation is predominantly governed by the surfactant monomer, not the counterion. In contrast, the enthalpy change (Delta HoWLM) of the process is significantly affected by the counterion. (AU) | |
| FAPESP's process: | 21/12071-6 - Tailoring colloids through supramolecular interactions: from fundamentals to applications |
| Grantee: | Watson Loh |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/15956-9 - Controlled assembly of polymers and/or surfactants investigated by light scattering and calorimetric techniques |
| Grantee: | Edvaldo Sabadini |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 15/25406-5 - Organizing matter: colloids formed by association of surfactants, polymers and nanoparticles |
| Grantee: | Watson Loh |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 24/01827-0 - Magnitudes of thermodynamic forces that result in the formation of giant micelles |
| Grantee: | Larissa de Almeida Ueti |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 23/10673-4 - Amphiphilic functionalized nanocellulose coatings for the protection of water sensitive paintings |
| Grantee: | Laura Caetano Escobar da Silva |
| Support Opportunities: | Scholarships in Brazil - Support Program for Fixating Young Doctors |
| FAPESP's process: | 23/11091-9 - Thermodynamic modeling of the formation of giant micelles |
| Grantee: | Álvaro Javier Patiño Agudelo |
| Support Opportunities: | Scholarships in Brazil - Support Program for Fixating Young Doctors |