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Stimuli-Responsive Polymers for Engineered Emulsions
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DOI：10.1002/marc.202300723.png)
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Abstract
En 中文
Emulsions are complex. Dispersing two immiscible phases, thus expanding an interface, requires effort to achieve and the resultant dispersion is thermodynamically unstable, driving the system toward coalescence. Furthermore, physical instabilities, including creaming, arise due to presence of dispersed droplets of different densities to a continuous phase. Emulsions allow the formulation of oils, can act as vehicles to solubilize both hydrophilic and lipophilic molecules, and can be tailored to desirable rheological profiles, including gel-like behavior and shear thinning. The usefulness of emulsions can be further expanded by imparting stimuli-responsive or smart behaviors by inclusion of a stimuli-responsive emulsifier, polymer or surfactant. This enables manipulation like gelation, breaking, or aggregation, by external triggers such as pH, temperature, or salt concentration changes. This platform generates functional materials for pharmaceuticals, cosmetics, oil recovery, and colloid engineering, combining both smart behaviors and intrinsic benefit of emulsions. However, with increased functionality comes greater complexity. This review focuses on the use of stimuli-responsive polymers for the generation of smart emulsions, motivated by the great adaptability of polymers for this application and their efficacy as steric stabilizers. Stimuli-responsive emulsions are described according to the trigger used to provide the reader with an overview of progress in this field. Emulsions, complex colloidal systems, serve as vehicles to solubilize hydrophilic and lipophilic molecules and can be tailored for desired rheological properties. However, their physical and thermodynamic instabilities are challenging. Stabilizing emulsions with stimuli-responsive macromolecules enables manipulation via pH, temperature or salt concentration changes, broadening applications in pharmaceuticals, cosmetics, and colloid engineering. This review highlights engineered emulsions stabilized by responsive polymers. image
Keywords:
cosmetics
creams
dispersions
pharmaceuticals
smart materials
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