Structure and stability of synthetic surfactant aggregates: Ion association selectivity to interfaces and vesicle formation (2023)
- Authors:
- Autor USP: MORTARA, LAURA - IQ
- Unidade: IQ
- Sigla do Departamento: QFL
- DOI: 10.11606/T.46.2023.tde-11122023-153443
- Subjects: ÍONS; SURFACTANTES
- Keywords: Anion hidrotrópico; Dinâmica molecular; Efeito de sal; Hydrophobic effect; Hydrotropic anion; Micelas; Micelles; Molecular dynamics; Salt effect; Vesicles; Vesículas
- Agências de fomento:
- Language: Inglês
- Abstract: Specific ion effect defines a variety of phenomena in physical chemistry and biology, from the stability of colloidal suspensions to enzymatic activity and ligand-receptor binding. Establishing a rigorous scientific interpretation of these effects has kept scientists busy for over a century. Nevertheless, a complete description of the specificities of ion interactions with the solute surface still needs to be completed. In the spontaneous aggregation of amphiphiles, the hydrophobic effect depends, almost exclusively, on the difference of free energy between the exposed areas of the hydrocarbon chains of the natural lipid or synthetic surfactant in solution or in the aggregate. The detailed structure of the aggregate, the chain order, and the viscosity depend critically on the surfactant's molecular structure and the medium composition. We showed that, for zwitterionic micelles, there is no specific anion effect on the overall micelle hydration, but there is a specific anion effect on the thermodynamics of micelle formation. We also showed that the degree of counterion partitioning in these zwitterionic micelles could be directly correlated to the dehydration of apolar moieties of hydrotropic anions upon interface interaction. Still, on ion effects, the competition between chloride and bromide interaction in cationic surfactant monolayers was directly quantified and modeled. Lastly, we showed the formation of vesicular aggregates by a novel imidazolium-based surfactant. Thermal phase behavior of this surfactant was characterized and the phase transition temperature significantly differed from a similar commercially available surfactant with the same alkyl tail length. The work developed in this thesis, using two different systems, i.e., zwitterionic and cationic surfactants, has clarified aspects related to specific ion effects and the formation of micellar and vesicular aggregates
- Imprenta:
- Data da defesa: 24.08.2023
- Este periódico é de acesso aberto
- Este artigo é de acesso aberto
- URL de acesso aberto
- Cor do Acesso Aberto: gold
- Licença: cc-by-nc-sa
-
ABNT
MORTARA, Laura. Structure and stability of synthetic surfactant aggregates: Ion association selectivity to interfaces and vesicle formation. 2023. Tese (Doutorado) – Universidade de São Paulo, São Paulo, 2023. Disponível em: https://www.teses.usp.br/teses/disponiveis/46/46136/tde-11122023-153443/. Acesso em: 21 out. 2024. -
APA
Mortara, L. (2023). Structure and stability of synthetic surfactant aggregates: Ion association selectivity to interfaces and vesicle formation (Tese (Doutorado). Universidade de São Paulo, São Paulo. Recuperado de https://www.teses.usp.br/teses/disponiveis/46/46136/tde-11122023-153443/ -
NLM
Mortara L. Structure and stability of synthetic surfactant aggregates: Ion association selectivity to interfaces and vesicle formation [Internet]. 2023 ;[citado 2024 out. 21 ] Available from: https://www.teses.usp.br/teses/disponiveis/46/46136/tde-11122023-153443/ -
Vancouver
Mortara L. Structure and stability of synthetic surfactant aggregates: Ion association selectivity to interfaces and vesicle formation [Internet]. 2023 ;[citado 2024 out. 21 ] Available from: https://www.teses.usp.br/teses/disponiveis/46/46136/tde-11122023-153443/ - Efeito de ânions hidrotrópicos em agregados de surfactantes catiônicos com duas caudas hidrocarbônicas
- Efeito de ânions hidrotrópicos em micelas de surfactantes zwitteriônicos
- Effect of hydrotropic anions on zwitterionic surfactant micelles
- Quantifying the Bromide vs. chloride adsorption at cationic surfactant interfaces
- Effect of hydrotropic anions on cationic surfactant aggregates with two hydrocarbon tails
- Caracterização de agregados formados por surfactantes catiônicos de duas caudas carbônicas: variações na hidrofobicidade da cabeça polar
- An imidazole-containing novel cationic surfactant
Informações sobre o DOI: 10.11606/T.46.2023.tde-11122023-153443 (Fonte: oaDOI API)
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