2026-06-27T22:30:00Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1019882025-03-18T13:25:35Zcom_20.500.14352_14col_20.500.14352_15

Carbone, Carlo Guzmán Solís, Eduardo Maldonado-Valderrama, Julia González Rubio, Ramón Ortega Gómez, Francisco 2024-03-06T09:06:28Z 2024-03-06T09:06:28Z 2024-03-01 10.3390/colloids8020016 https://hdl.handle.net/20.500.14352/101988 This study investigates the effect of an inert salt (NaCl) on the equilibrium interfacial tension and dilatational modulus of Pluronic F-68 copolymer, a triblock copolymer consisting of two terminal blocks of poly(ethylene oxide) and a less hydrophilic central block of poly(propylene oxide). Interfacial tension measurements were carried out using a surface force balance and a drop shape tensiometer, while rheological measurements were carried out in two different frequency ranges. This involved the use of the oscillatory barrier/droplet method and electrocapillary wave measurements, complemented by an appropriate theoretical framework. This work aimed to elucidate the influence of NaCl on the interfacial behavior of Gibbs monolayers of Pluronic F-68. In addition, this study highlights some of the technical and theoretical limitations associated with obtaining reliable dilatational rheological data at high frequencies (<1 kHz) using electrocapillary wave measurements. The results provide valuable insights into the interplay between salt presence and interfacial properties of Pluronic F-68 and highlight the challenges of obtaining accurate dilatational rheological data under specific measurement conditions. eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 International Ionic strength effect in the equilibrium and rheological behavior of an amphiphilic triblock copolymer at the air/solution interface journal article