Ionic Strength Effect in the Equilibrium and Rheological Behavior of an Amphiphilic Triblock Copolymer at the Air/Solution Interface

被引:0
作者
Carbone, Carlo [1 ]
Guzman, Eduardo [1 ,2 ]
Maldonado-Valderrama, Julia [3 ]
Rubio, Ramon G. [1 ,2 ]
Ortega, Francisco [1 ,2 ]
机构
[1] Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Fis, Plaza Ciencias 2,Ciudad Univ, Madrid 28040, Spain
[2] Univ Complutense Madrid, Inst Pluridisciplina, Paseo Juan XXIII 1,Ciudad Univ, Madrid 28040, Spain
[3] Univ Granada, Dept Fis Aplicada, Campus Fuentenueva S-N, Granada 18071, Spain
关键词
dilational rheology; electrocapillary waves; interfacial tension; ionic strength; copolymer; water/air interface; AIR-WATER-INTERFACE; BLOCK-COPOLYMERS; DILATIONAL VISCOELASTICITY; POLY(ETHYLENE OXIDE); AQUEOUS-SOLUTIONS; PHASE-BEHAVIOR; SURFACE; ADSORPTION; MICELLIZATION; SALTS;
D O I
10.3390/colloids8020016
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
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页数:19
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