RT Journal Article
T1 Interfacial dilational rheology of chitosan-silica nanocomposite films at the aqueous dispersion/air interface
A1 Carbone, Carlo
A1 Navarro-Arrebola, Iván
A1 Liggieri, Libero
A1 Ortega Gómez, Francisco
A1 González Rubio, Ramón
A1 Guzmán Solís, Eduardo
AB This study investigates the interaction between positively charged chitosan and anionic hydrophilic silica nanoparticles in aqueous media, resulting in the electrostatic formation of chitosan-capped silica nanoparticles. Optimal conditions for the formation of stable dispersions were determined, highlighting that the adsorption of chitosan on silica nanoparticles, as well as its solubility, is enhanced in acidic medium (pH = 4.5). Electrophoretic mobility measurements confirmed the positive zeta potential of chitosan-capped particles, indicating charge inversion due to chitosan adsorption on negatively charged silica surfaces. Adsorption at the dispersion/air interface significantly reduces the interfacial tension, with a synergistic effect observed between chitosan and silica. Capillary wave experiments demonstrated the formation of viscoelastic layers with the dilatational elastic modulus of the nanocomposite layers exceeding their viscous modulus. The frequency dependence of the interfacial dilational moduli showed that increasing particle concentration enhanced the viscoelastic properties of the interface. This study provides novel insights into the dilational rheological response of chitosan-capped silica nanoparticle layers, revealing the interplay between surface charge neutralization, adsorption dynamics, and the viscoelastic properties of the interface. The results suggest potential applications in the stabilization of liquid and solid foams and highlight the importance of chitosan-capped particles in modifying water/air interface properties and improving the rheological behavior of particle-laden interfaces.
PB Elsevier
YR 2025
FD 2025-02-27
LK https://hdl.handle.net/20.500.14352/118556
UL https://hdl.handle.net/20.500.14352/118556
LA eng
NO Carlo Carbone, Iván Navarro-Arrebola, Libero Liggieri, Francisco Ortega, Ramón G. Rubio, Eduardo Guzmán, Interfacial dilational rheology of chitosan-silica nanocomposite films at the aqueous dispersion/air interface, Journal of Molecular Liquids, Volume 425, 2025, 127273, ISSN 0167-7322, https://doi.org/10.1016/j.molliq.2025.127273.
NO Ministerio de Ciencia e Inovación (España)
NO Universidad Complutense de Madrid
NO Unión Europea
DS Docta Complutense
RD 9 abr 2025