Utilize este identificador para referenciar este registo: https://hdl.handle.net/10316/27912
Título: Thermodynamic analysis of unimer-micelle and sphere-to-rod micellar transitions of aqueous solutions of sodium dodecylbenzenesulfonate
Autor: Valente, Artur J. M. 
López Cascales, J. J. 
Fernández Romero, Antonio J. 
Palavras-chave: Sodium dodecylbenzenesulfonate; Electrical conductivity; Critical micelle concentration; Transition micellar concentration; Sphere-to-rod transition; Micellization thermodynamics
Data: Out-2014
Editora: Elsevier
Citação: VALENTE, Artur J. M.; LÓPEZ CASCALES, J. J.; FERNANDÉZ ROMERO, Antonio J. - Thermodynamic analysis of unimer-micelle and sphere-to-rod micellar transitions of aqueous solutions of sodium dodecylbenzenesulfonate. "The Journal of Chemical Thermodynamics". ISSN 0021-9614. Vol. 77 (2014) p. 54-62
Título da revista, periódico, livro ou evento: The Journal of Chemical Thermodynamics
Volume: 77
Resumo: Temperature dependence of specific conductivity of sodium dodecylbenzenesulfonate (NaDBS) aqueous solutions was analyzed. Two breaks on the plot appeared for all temperature, which suggest two micellar transitions. This has been corroborated by surface tension measurements. The first transition concentration occurs at the critical micelle concentration (CMC), whilst the second critical concentration (so-called transition micellar concentration, TMC) is due to a sphere-to-rod micelles transition. The dependence of CMC and TMC on the temperature allows the computation of the corresponding thermodynamic functions: Gibbs free energy, enthalpy and entropy changes. For the CMC, enthalpy and entropy increments were found that decrease with the temperature values. However, an anomalous behavior was obtained for the TMC, where both ΔS0 and ΔH0 values raised with the temperature increase. However, for both transitions, an (enthalpy + entropy) compensation is observed. These results will be compared with similar systems reported in the literature.
URI: https://hdl.handle.net/10316/27912
ISSN: 0021-9614
DOI: 10.1016/j.jct.2014.05.001
Direitos: openAccess
Aparece nas coleções:FCTUC Química - Artigos em Revistas Internacionais

Mostrar registo em formato completo

Citações SCOPUSTM   

11
Visto em 11/mar/2024

Citações WEB OF SCIENCETM
5

10
Visto em 2/mar/2024

Visualizações de página 20

661
Visto em 12/mar/2024

Downloads 50

425
Visto em 12/mar/2024

Google ScholarTM

Verificar

Altmetric

Altmetric


Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.