Monolayer emulsions inherently demonstrate limited stability, necessitating the strategic engineering of multilayer interfacial architectures to enhance their resistance to coalescence and aggregation. Binary polymer (BP)-stabilized emulsions demonstrate superior long-term stability, with specific systems (e.g., myofibrillar protein/chitosan composites) reaching interfacial pressures of ∼19.1 mN/m and dilatational moduli up to 50 mN/m. However, a systematic understanding of how diverse interfacial distribution modes (composite vs. bilayer) govern stability, and the application of advanced in situ probes to decipher these mechanisms, remains a significant research gap. This review critically examines fabrication strategies, applications of advanced in situ characterization methodologies, and persistent challenges associated with diversified interfacial distribution modes in BP emulsion systems. In composite interface emulsions, the interfacial layers are formed by covalently/non-covalently crosslinked BPs. We compare these emulsions to bilayer emulsions, formed by layer-by-layer (LbL) self-assembly or an externally induced assembly protocol. Despite these advances, traditional characterization tools have inherent limitations in resolving complex BP interfacial structure. Modern in situ analytical techniques, such as multiple light scattering (MLS), bulk phase exchange method, diffusion wave spectroscopy (DWS) micro-rheology, front surface fluorescence spectroscopy (FSFS), 3D confocal laser scanning microscopy (3D-CLSM), cryogenic transmission electron microscopy (Cryo-TEM), and small-angle X-ray/neutron scattering (SAXS/SANS), offer transformative insights into BP emulsion interface dynamics and stability factors. Looking forward, research priorities should focus on developing mild, scalable, and controllable interface engineering protocols while advancing characterization paradigms to unlock the full potential of BP emulsion technologies across food industrial, pharmaceutical, and materials science applications, particularly in designing next-generation delivery systems and responsive materials.
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