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Stimuli-responsive colloidal tactoids
DOI:10.1016/j.cocis.2026.102070.png)
Abstract
En 中文
Liquid–liquid crystalline phase separation (LLCPS) of filamentous colloids gives rise to tactoids, micrometer-sized droplets with anisotropic shapes and internal liquid-crystalline order. Although tactoids have been known for nearly a century, their out-of-equilibrium behavior and response to external stimuli have only recently begun to be explored, revealing them as reconfigurable colloidal systems with flexible interfaces and a rich diversity of shapes and internal configurations. In this review, we discuss the recent literature on the physical principles of tactoid responsiveness, highlighting how very small, comparable contributions of bulk elasticity and interfacial tension make tactoids highly responsive to physicochemical stimuli. We then review various stimuli that enable control of tactoids across several hierarchical levels, from colloidal interactions and phase separation pathways to tactoid shapes and internal liquid-crystalline configurations. Linking such hierarchical control to emergent optical, mechanical, and transport functionalities, we discuss the biological and technological implications of stimuli-responsive colloidal tactoids. We conclude by outlining the emerging opportunities and challenges toward programmable control of colloidal tactoids.
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