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DY: Fachverband Dynamik und Statistische Physik

DY 16: Droplets, Wetting, and Microfluidics (joint session DY/CPP)

DY 16.8: Vortrag

Montag, 9. März 2026, 17:00–17:15, ZEU/0118

Hyperuniformity in Ternary Fluid Mixtures: The Role of Wetting and Hydrodynamics — •Nadia Bihari Padhan and Axel Voigt — Institute of Scientific Computing, TU Dresden, 01069 Dresden, Germany

Phase separation in multicomponent fluids underlies the organization of complex materials and biological structures, including biomolecular condensates. The Cahn-Hilliard-Navier-Stokes (CHNS) framework provides a natural description of such systems by coupling diffusive and hydrodynamic processes. In this talk, I will present our study of hyperuniformity–suppressed large-scale density fluctuations–in ternary CHNS mixtures. We show that hydrodynamics systematically drives the system toward less hyperuniform states and generates a rich set of morphologies, such as interconnected droplets and double emulsions reminiscent of biological phase separation. In partial-wetting regimes, all three components display comparable hyperuniformity, whereas in complete-wetting regimes the preferred wetting component exhibits a marked loss of hyperuniformity. These results identify wetting asymmetry as a key control parameter for spatial order in multiphase fluids and offer a pathway for tuning large-scale organization in soft-matter and biological systems.

References [1] Boyer, F. and Lapuerta, C., Study of a three component Cahn-Hilliard flow model, ESAIM: Mathematical Modelling and Numerical Analysis, 40, 653-687 (2006). [2] Padhan, Nadia Bihari and Voigt, Axel, Hyperuniformity in ternary fluid mixtures: the role of wetting and hydrodynamics, arXiv:2506.22647, (2025).

Keywords: Phase separation; Wetting; Hyperuniformity; Pattern formation