Formation of microcapsules by complex coacervation

Ach, Delphine; Briançon, Stéphanie; Broze, Guy; Puel, François; Rivoire, Alain; Galvan, Jean‐Marc; Chevalier, Yves

doi:10.1002/cjce.22086

Cited by 36 publications

(18 citation statements)

References 40 publications

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“…Due to the complex coacervation process, it has been reported that coacervate deposition during shell formation can bring together more than one oil droplets [26]. Formation of multinuclear microcapsules was not observed in this study.…”

Section: Microcapsules' Morphologycontrasting

confidence: 56%

Polymeric microcapsules with switchable mechanical properties for self-healing concrete: synthesis, characterisation and proof of concept

Kanellopoulos

Palmer²,

Kerr³

et al. 2017

Smart Mater. Struct.

118

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Microcapsules, with sodium silicate solution as core, were produced using complex coacervation in a double, oil-in-water-in oil, emulsion system. The shell material was a gelatin-acacia gum crosslinked coacervate and the produced microcapsules had diameters ranging from 300 to 700 μm. The shell material designed with switchable mechanical properties. When it is hydrated exhibits soft and 'rubbery' behaviour and, when dried, transitions to a stiff and 'glassy' material. The microcapsules survived drying and rehydrating cycles and preserved their structural integrity when exposed to highly alkaline solutions that mimic the pH environment of concrete. Microscopy revealed that the shell thickness of the microcapsules varies across their perimeter from 5 to 20 μm. Thermal analysis showed that the produced microcapsules were very stable up to 190°C. Proof of concept investigation has demonstrated that the microcapsules successfully survive and function when exposed to a cement-based matrix. Observations showed that the microcapsules survive mixing with cement and rupture successfully upon crack formation releasing the encapsulated sodium silicate solution.

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Section: Microcapsules' Morphologycontrasting

confidence: 56%

Polymeric microcapsules with switchable mechanical properties for self-healing concrete: synthesis, characterisation and proof of concept

Kanellopoulos

Palmer²,

Kerr³

et al. 2017

Smart Mater. Struct.

118

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show abstract

“…Some toxic crosslinking agents (such as formaldehyde, glutaraldehyde, etc.) are often added during the preparation process in order to improve the mechanical properties and stability of the microcapsules [14][15][16]. The sizes and release behaviors of microcapsules prepared by the existing preparation methods were not satisfactory.…”

Section: Introductionmentioning

confidence: 99%

Double-Layered Microcapsules Significantly Improve the Long-Term Effectiveness of Essential Oil

Zhang

Luo

Wang³

et al. 2020

Polymers

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In order to improve the long-term effectiveness of essential oil, a double-layered microcapsule was prepared using the inclusion encapsulation method in this study, with β-cyclodextrin as its inner layer and chitosan and sodium alginate as its outer layer. The optimized preparation process was obtained through the response surface method. The morphology, particle size, encapsulation efficiency, thermal stability and sustained release effect of the double-layered microcapsules were characterized. The microcapsules were spherical, with a particle size distribution between 2–6 μm, and had good thermal stability within 250 °C. Their encapsulation efficiency can be up to 80%, and it can continuously release the active ingredients of the essential oil under normal temperature and high temperature conditions for a long time. In order to further examine the application effect of the double-layered microcapsule, it was loaded onto the cotton fabric by the soak-roll method. The finished cotton fabric showed excellent washability and rubbing fastness. They can still maintain a light fragrance naturally for two months. The microcapsules prepared in this study can be potentially applied in sleep aid, antibacterial, mosquito prevention, food science and other related products.

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“…Out of similar objective, microencapsulation of pequi oil based on gelatin/cashew gum crosslinked by tannic acid, or linseed oil based on gelatin/arabic gum crosslinked by glutaraldehyde was reported. [ 109,110 ] Apart from complex of protein and polysaccharide, Xia et al. [ 111 ] constructed stable microcapsules containing anchovy oil using gelatin and sodium hexametaphosphate crosslinked by transglutaminase.…”

Section: Potential Applications Of Coacervatementioning

confidence: 99%

Recent Advances in Complex Coacervation Design from Macromolecular Assemblies and Emerging Applications

Zhou

Shi

Liu

et al. 2020

Macromol. Rapid Commun.

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Coacervation is a process during which a homogeneous aqueous solution undergoes liquid–liquid phase separation, giving rise to two immiscible liquid phases composed of a colloid‐rich coacervate phase in equilibrium with a colloid‐poor phase simultaneously. Recent attempts to develop complex coacervation from macromolecular self‐assemblies have diversified a large group of novel coacervate‐related materials with sophisticated properties and emerging applications. In this review, the most recent progress in the design strategies of macromolecular complex coacervation is discussed with respect to different key parameters, including macromolecular structure, mixing ratio, ionic strength, pH, and temperature, etc. Furthermore, the applications of these multiple‐functional coacervate materials, oriented toward advanced encapsulation, are further summarized into several active domains in wastewater treatment, protein purification, food formulation, underwater adhesives, drug delivery, and cellular mimics. Finally, perspectives and future challenges related to the further advancement of macromolecular complex coacervates are proposed.

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Formation of microcapsules by complex coacervation

Cited by 36 publications

References 40 publications

Polymeric microcapsules with switchable mechanical properties for self-healing concrete: synthesis, characterisation and proof of concept

Polymeric microcapsules with switchable mechanical properties for self-healing concrete: synthesis, characterisation and proof of concept

Double-Layered Microcapsules Significantly Improve the Long-Term Effectiveness of Essential Oil

Recent Advances in Complex Coacervation Design from Macromolecular Assemblies and Emerging Applications

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