Pickering Emulsion Templated Layer-by-Layer Assembly for Making Microcapsules

Li, Jian; Stöver, Harald D. H.

doi:10.1021/la1020498

Cited by 61 publications

(43 citation statements)

References 66 publications

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“…There are many well-established physical and chemical methods for fabricating homogenous colloidosomes, including membrane or microfluidic emulsification [54], emulsification by mechanical stirring [23], layer-by-layer assembly [55,56], pan coating, spray drying [48], phase separation [57], and more. However, not many methods have been developed yet for synthesizing heterogeneous colloidal capsules.…”

Section: Synthesis Of Patchy Colloidosomesmentioning

confidence: 99%

Patchy colloidosomes – an emerging class of structures

Rozynek

Józefczak

2016

Eur. Phys. J. Spec. Top.

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Abstract.A colloidosome, i.e., a selectively permeable capsule composed of colloidal particles forming a stable homogenous shell, is a tiny container that can be used for storage, transportation, and release of cargo species. There are many routes to preparing colloidosomes; dozens of examples of future applications of such colloidal capsules have been demonstrated. Their functionality can be further extended if the capsules are designed to have heterogeneous shells, i.e., one or more regions (patches) of a shell are composed of material with specific properties that differ from the rest of the shell. Such patchy colloidosomes, supplemented by functionalities similar to that offered by well-studied patchy particles, will surely possess advantageous properties when compared with their homogenous counterparts. For example, owing to specific interactions between patches, they either can self-assemble into complex structures; specifically adhere to a surface; release their cargo species in specific direction; or guided-align,-orient or -propel. Fabrication of patchy colloidal microcapsules has long been theorized by scientists able to design different models, but actual large-scale production remains a challenge. Until now, only a few methods for fabricating patchy colloidosomes have been demonstrated, and these include production by means of microfluidics and mechanical pipetting. The field of science related to fabrication and application of patchy colloidosomes is clearly unexplored, and we envision it blooming in the coming years.

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Section: Synthesis Of Patchy Colloidosomesmentioning

confidence: 99%

Patchy colloidosomes – an emerging class of structures

Rozynek

Józefczak

2016

Eur. Phys. J. Spec. Top.

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“…30,39,40 This has two main advantages. Firstly it ensures that adjacent particles are bridged on the surface of the emulsion droplets.…”

Section: Addition Of One (Multiple) Layer(s) Of Adsorbing Polymermentioning

confidence: 99%

“…40 Thompson et al initiated the polymerization of a pyrrole monomer within the continuous aqueous phase of microcapsules with a crosslinked particle monolayer. This procedure resulted in the coating of the microcapsules with polypyrrole, which improved the retention of a fluorescein dye initially dissolved in the sunflower oil core of the emulsion templates.…”

Section: Addition Of One (Multiple) Layer(s) Of Adsorbing Polymermentioning

confidence: 99%

CHAPTER 9. Particle-Stabilized Emulsions as Templates for Hollow Spheres and Microcapsules

Biggs¹,

Cayre²

2014

Soft Matter Series

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“…In this study, a flow-based continuous layer-by-layer method for preparation of gram quantities of capsules introduced in our previous paper [39] was used for fabrication of multi-layered polyelectrolyte shells formed around nano-emulsion droplets. The layer-by-layer method has been extensively used for encapsulation of emulsions [40][41][42][43][44][45] and recently nano-emulsions [46], however, no studies, at least to our knowledge, have been reported regarding layer-by-layer on emulsified ionic liquids acting as a core material. In this paper, we show that it was possible to use an ionic liquid nano-emulsion as a core material for the layer-by-layer process.…”

Section: Introductionmentioning

confidence: 99%

Layer-by-layer encapsulated nano-emulsion of ionic liquid loaded with functional material for extraction of Cd2+ ions from aqueous solutions

Elizarova

Luckham

2017

Journal of Colloid and Interface Science

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Ionic liquids can serve as an environmentally-friendly replacement for solvents in emulsions, therefore they are considered suitable to be used as an emulsified medium for various active materials one of which are extractors of metal ions. Increasing the extraction efficiency is considered to be one of the key objectives when working with such extraction systems. One way to improve the extraction efficiency is to increase the contact area between the extractant and the working ionic solution. This can be accomplished by creating a nano-emulsion of ionic liquid containing such an extractant. Since emulsification of ionic liquid is not always possible in the sample itself, there is a necessity of creating a stable emulsion that can be added externally and on demand to samples from which metal ions need to be extracted. We propose a method of fabrication of a highly-stable extractant-loaded ionic liquid-in-water nano-emulsion via a low-energy phase reversal emulsification followed by continuous layer-by-layer polyelectrolyte deposition process to encapsulate the nano-emulsion and enhance the emulsion stability. Such a multilayered stabilized nano-emulsion was tested for extraction of Cd 2+ and Ca 2+ ions in order to determine its extraction efficiency and selectivity. It was found to be effective in extraction of Cd 2+ ions with near 100% cadmium removal, as well as being selective since no Ca 2+ ions were extracted. The encapsulated emulsion was removed from samples post-extraction using two methods -filtration and magnetic separation, both of which were shown to be viable under different circumstances -larger and mechanically stronger capsules could be removed by filtration, however magnetic separation worked better for both smaller and bigger capsules. The long-term stability of nano-emulsion was also tested being a very important characteristic for its proposed use: it was found to be highly stable after four months of storage time.

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Pickering Emulsion Templated Layer-by-Layer Assembly for Making Microcapsules

Cited by 61 publications

References 66 publications

Patchy colloidosomes – an emerging class of structures

Patchy colloidosomes – an emerging class of structures

CHAPTER 9. Particle-Stabilized Emulsions as Templates for Hollow Spheres and Microcapsules

Layer-by-layer encapsulated nano-emulsion of ionic liquid loaded with functional material for extraction of Cd2+ ions from aqueous solutions

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