Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/20991
Título: New Urea-Based Surfactants Derived from alpha,omega-Amino Acids
Autor: Faustino, Celia M. C.
Calado, Antonio R. T.
Garcia-Rio, Luis
Palavras-chave: Chemistry, Physical
Data: 2009
Editora: AMER CHEMICAL SOC
Citação: JOURNAL OF PHYSICAL CHEMISTRY B. - Vol. 113, n. 4 (2009), p. 977-982
Resumo: New anionic urea-based surfactants derived from alpha,omega-amino acids and in particular from beta-alanine were synthesized and their solution properties characterized by electrical conductivity, equilibrium surface tension, and steady-state fluorescence spectroscopy techniques. Double-chain surfactants and the single-chain surfactant containing a sulfate head group exhibited the lowest critical micelle concentration (cmc) values and superior efficiency in lowering surface tension. All surfactants promoted adsorption relative to micellization, and micellar parameters were sensitive to the hydrophobicity of the amino acid residue. The polarity of the interfacial region, measured with the solvatochromic probe E-T(30) (Reichardt's betaine dye), was similar to sodium dodecyl sulfate (SDS) micelles.
URI: http://hdl.handle.net/10451/20991
DOI: http://dx.doi.org/10.1021/jp807396k
ISSN: 1520-6106
Aparece nas colecções:FF - Produção Científica 2000-2009

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