Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Study of the interaction between a nonyl phenyl ether and beta-cyclodextrin: Declouding nonionic surfactant solutions by complexation
Year:2007
Research Areas
  • Organic materials,
  • Physic chemistry
Information
Abstract
Absorption and fluorescence measurements for aqueous solutions at 298 K containing pentaoxyethylene nonyl phenyl ether (NPE5), in the absence and presence of beta-cyclodextrin (beta-CD), were analyzed to determine the effect of the complexation on the aggregation of the surfactant. For the binary system, the appearance of a new emission band and the presence of an isoemissive point in the emission spectra at the time and frequency domains indicate the formation of an excimer within the micellar core. The addition of beta-CD induces the formation of an inclusion complex strong enough to break the aggregates and avoid the excimer formation. For the ternary system, the increase in fluorescence has been used to assess the binding constants of 1:1 + 2:1 stoichiometries. Static light scattering, H-1 NMR diffusion-ordered spectroscopy (DOSY), and two-dimensional rotating-frame Overhauser enhancement spectroscopy (ROESY) experiments were used to characterize the cloud point of NPE5 at 298 K, and to ascertain the effects of complexation on the clouding process. In the presence of beta-CD, the analysis of the H-1 NMR spectra and the self-diffusion coefficients reveal the existence of interactions between the beta-CD and the aggregates that increase the cloud-point concentration more than expected. Under conditions of excess of beta-CD, ROE enhancements point to a complex of dominant 2:1 stoichiometry (beta-CD:NPE5) in which the hydrophobic moiety of the surfactant threads two beta-CDs.
International
Si
JCR
Si
Title
J PHYS CHEM B
ISBN
1520-6106
Impact factor JCR
4,086
Impact info
Volume
111
Journal number
6
From page
1368
To page
1376
Month
SIN MES
Ranking
Participants
  • AUTOR: A GUERRERO-MARTINEZ (UNIV. COMPLUTENSE)
  • AUTOR: GLORIA TARDAJOS (UNIV. COMPLUTENSE)
  • Autor: Teresa Montoro Ordoñez (UPM)
  • AUTOR: MH VINAS (UNIV. COMPLUTENSE)
  • AUTOR: G GONZALEZ-GAITANO (UNIV. COMPLUTENSE)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Propiedades ópticas, eléctricas y magnéticas de materiales y sus aplicaciones (POEMMA)
  • Departamento: Ciencias Básicas Aplicadas a la Ingeniería Forestal
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)