(67i) The Applicability of the 2D BSW Rheology Model to Particle-Laden Interfaces

Interfacial rheology plays a crucial role in understanding the stability and dynamics of emulsions, foams, and other soft materials. Accurately describing the viscoelastic behavior of these interfaces requires robust models that capture the interplay between interfacial elasticity and dissipation. The Baumgärtel–Schausberger–Winter (BSW) model, widely used in bulk rheology to describe linear viscoelasticity, has recently been extended to two-dimensional (2D) interfacial systems [1]. In this work, we evaluate the applicability of the 2D BSW model to a range of particle-laden interfaces by analyzing their frequency-dependent rheological response. By extracting the relaxation spectrum from BSW fits, we gain insight into the characteristic timescales governing interfacial stress relaxation and the role of particle interactions in shaping the mechanical properties of the interface. Additionally, we explore potential limitations of the 2D BSW framework, particularly in systems involving soft particles, where deviations from the predicted relaxation behavior may arise. By investigating the limits and capabilities of the 2D BSW model, this work contributes to the broader effort of developing accurate rheological descriptions for interfacial materials with practical relevance in formulation science and materials engineering.

[1] Correia, E. L.; Winter, H. H.; Razavi, S. Two-dimensional glass transition-like behavior of Janus particle-laden interface. Rheol Acta 2023. DOI: 10.1007/s00397-023-01389-w.