Stimuli-responsive emulsions: Recent advances and potential applications

Ge, Xue-hui; Mo, Liangji; Yu, Anhe; Tian, Chenzi; Wang, Xiaoda; Chen, Yang; Qiu, Ting

doi:10.1016/j.cjche.2021.11.002

Cited by 29 publications

(40 citation statements)

References 94 publications

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“…In contrast, after heating, the nonionic surfactant has a stronger hydrophobicity due to dehydration of hydrophilic groups. [2,28] In this context, Binks et al described for the first time temperature-modulated emulsion inversion. [2] Polystyrene (PS) latex particles were sterically stabilized by the adsorption of a diblock copolymer, poly[2-(dimethylamino)ethyl methacrylate block methyl methacrylate] (PDMAEMA-b-PMMA).…”

Section: Temperature-responsive Emulsionsmentioning

confidence: 99%

“…[8,40,47] Physical factors are widely used as triggers to modulate emulsions properties due to its easy controlling, low toxicity, environmental friendliness, and wide application range. [28] In addition, physical stimuli act without directly invading emulsion components and contaminating emulsions. [28] These advantages give physical stimulus response emulsions the potential to be widely used in a variety of application fields.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

“…In contrast, after heating, the nonionic surfactant has a stronger hydrophobicity due to dehydration of hydrophilic groups. [ 2,28 ] In this context, Binks et al. described for the first time temperature‐modulated emulsion inversion.…”

Section: Physical Stimuli‐responsive Emulsionsmentioning

confidence: 99%

“…[ 28 ] In addition, physical stimuli act without directly invading emulsion components and contaminating emulsions. [ 28 ] These advantages give physical stimulus response emulsions the potential to be widely used in a variety of application fields. Changes in temperature in living organisms occur continuously across a wide range of stimuli, so mild temperature‐responsive emulsions hold great promise for biomedical applications.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

“…Triggers that induce changes in emulsions' properties can be divided into physical and chemical stimuli. [ 28 ] pH‐stimuli and CO 2 ‐stimuli, which act by directly contacting and reacting with the emulsion, are classified as chemical stimuli. Such stimuli often affect the macroscopic properties of materials by triggering fine chemical reactions that alter the properties (surface activity, polarity, or solubility) of stimuli‐sensitive molecules.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Recent Progress toward Physical Stimuli‐Responsive Emulsions

Zeng

Cheng

et al. 2022

Macromol. Rapid Commun.

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Emulsion as a fine dispersion of immiscible liquids has involved widespread applications in industry, pharmaceuticals, agriculture, and personal care. Stimuli-responsive emulsions capable of on-demand demulsification or changing their properties are required in many cases such as controllable release cargo, oil recovery, emulsifier recycling, and product separation, great progress is achieved in these areas. Among these various triggers, much effort is made to develop physical stimuli, due to the noninvasive and environmentally friendly characteristics. Physical stimuli-responsive emulsions provide plenty of valuable practical applications in the fields of sustainable industry, biomedical reaction, drug delivery. Here, the recent development in the field of emulsions in response to physical stimuli consisting of temperature, light, magnetic fields, electrical fields, etc., is summarized. The preparation methods and mechanisms of physical stimuli-responsive emulsions and their applications of catalysis reaction, drug delivery, and oil recovery are highlighted in this review. The future directions and outstanding problems of the physical stimuli-responsive emulsions are also discussed.

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Section: Temperature-responsive Emulsionsmentioning

confidence: 99%

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Section: Physical Stimuli‐responsive Emulsionsmentioning

confidence: 99%

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent Progress toward Physical Stimuli‐Responsive Emulsions

Zeng

Cheng

et al. 2022

Macromol. Rapid Commun.

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Stimuli‐Responsive Polymers for Engineered Emulsions

Rajbanshi,

Hilton,

Dreiss

et al. 2024

Macromol. Rapid Commun.

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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.

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Smart emulsion system driven by light‐triggered ionic liquid molecules and its application in eco‐friendly water‐saving dyeing

Gao,

Liang,

Jing

et al. 2024

Smart Molecules

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The smart emulsification and demulsification system with the light response is a useful tool in various industries, including green chemistry, catalytic reaction, pharmaceuticals, and environmental remediation. Herein, an ionic liquid crystal compound with a light triggered switch based on the azobenzene group [(4‐{3‐methyl‐1‐[3‐(8‐octyloxyoctyl)oxy‐4‐oxobutanoyl]imidazo‐lium‐1‐yl}octyl)oxy] ‐N‐(4‐methylphenyl)benzene‐1,2‐diazene bromide (MOIAzo), was designed and synthesized, which could cause reversible transition between emulsification and demulsification through the light trigger. The ionic liquid has an efficient photoinduced liquefaction process, which dramatically lowers the melting point of ionic liquids from 79 to 9.2 oC. This significantly broadens the liquid state temperature of the ionic liquid crystal. The ionic liquid crystal MOIAzo exhibits both photoinduced and thermally induced nematic liquid crystal properties. The smart emulsion system was effectively employed in an eco‐friendly water‐saving dyeing process of cationic dyes for cationic dyeable polyester (CDP) fabrics, which used only half the amount of water compared with the conventional water bath dyeing method. After dyeing, the oil and water phases can be efficiently separated through the light irradiation, and the oil phase can be reused for the subsequent dyeing process. This novel smart emulsion dyeing method greatly reduces the water consumption and wastewater discharge. MOIAzo as a light‐triggered ionic liquid molecule opens up new dimensions in green chemistry.

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Stimuli-responsive emulsions: Recent advances and potential applications

Cited by 29 publications

References 94 publications

Recent Progress toward Physical Stimuli‐Responsive Emulsions

Recent Progress toward Physical Stimuli‐Responsive Emulsions

Stimuli‐Responsive Polymers for Engineered Emulsions

Smart emulsion system driven by light‐triggered ionic liquid molecules and its application in eco‐friendly water‐saving dyeing

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