RT Journal Article
T1 Highly viscoelastic films at the water/air interface: α-Cyclodextrin with anionic surfactants
A1 Luviano, Alberto S.
A1 Hernández Pascacio, Jorge
A1 Ondo, Daniel
A1 Campbell, Richard A.
A1 Piñeiro Guillén, Ángel
A1 Campos Terán, José
A1 Costas, Miguel
K1 α-Cyclodextrin
K1 Surfactant
K1 Viscoelastic films
K1 Water/air interface
K1 Dilatational modulus
K1 Neutron reflectometry
K1 Ellipsometry
K1 Isothermal titration calorimetry
AB This work showcases the remarkable viscoelasticity of films consisting of α-cyclodextrin (α-CD) and anionic surfactants (S) at the water/air interface, the magnitude of which has not been observed in similar systems. The anionic surfactants employed are sodium salts of a homologous series of n-alkylsulfates (n = 8–14) and of dodecylsulfonate. Our hypothesis was that the very high viscoelasticity can be systematically related to the bulk and interfacial properties of the system. Through resolution of the bulk distribution of species using isothermal titration calorimetry, the high dilatational modulus is related to (α-CD)2:S1 inclusion complexes in the bulk with respect to both the bulk composition and temperature. Direct interfacial characterization of α-CD and sodium dodecylsulfate films at 283.15 K using ellipsometry and neutron reflectometry reveals that the most viscoelastic films consist of a highly ordered monolayer of 2:1 complexes with a minimum amount of any other component. The orientation of the complexes in the films and their driving force for adsorption are discussed in the context of results from molecular dynamics simulations. These findings open up clear potential for the design of new functional materials or molecular sensors based on films with specific mechanical, electrical, thermal, chemical, optical or even magnetic properties
PB Elsevier
SN 0021-9797
YR 2020
FD 2020
LK http://hdl.handle.net/10347/24307
UL http://hdl.handle.net/10347/24307
LA eng
NO Journal of Colloid and Interface Science, Volume 565, 1 April 2020, Pages 601-613
NO This work was supported by grant number 099844 CONACyT-México to M.C., grant number CB-2012/182526 CONACyT-México to J.C.-T., grant number 5000-9018 from PAIP-FQ-UNAM-México to M.C., grant MAT2015-71826-P from MINECO-Spain to Á.P., and grant number MSMT No 21-SVV/2018 for specific university research to D.O. We are grateful to the “Centro of Supercomputación de Galicia” (CESGA) for computing time and for their excellent services. The open access fee was covered by FILL2030, a European Union project within the European Commission’s Horizon 2020 Research and Innovation programme, under grant agreement N°731096
DS Minerva
RD 28 abr 2026