RT Journal Article
T1 Ionic strength effect in the equilibrium and rheological behavior of an amphiphilic triblock copolymer at the air/solution interface
A1 Carbone, Carlo
A1 Guzmán Solís, Eduardo
A1 Maldonado-Valderrama, Julia
A1 González Rubio, Ramón
A1 Ortega Gómez, Francisco
AB 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.
PB MDPI
YR 2024
FD 2024-03-01
LK https://hdl.handle.net/20.500.14352/101988
UL https://hdl.handle.net/20.500.14352/101988
LA eng
DS Docta Complutense
RD 1 sept 2024