Assembly of Alternated Multivalent Ion/Polyelectrolyte Layers on Colloidal Particles. Stability of the Multilayers and Encapsulation of Macromolecules into Polyelectrolyte Capsules

Radtchenko, Igor L.; Sukhorukov, Gleb B.; Leporatti, Stefano; Хомутов, Г.Б.; Donath, Edwin; Möhwald, Helmuth

doi:10.1006/jcis.2000.7068

Cited by 179 publications

(148 citation statements)

References 18 publications

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“…From the fit of experimental data we have ob- tained E/ϕ ∼ 300 MPa for the first type, and E/ϕ ∼ 200 MPa for the second type of capsules. One can conclude that, taking into account realistic values of the osmotic coefficients [15,17] for PSS solutions, Young's modulus E found in our swelling experiment is of the order of 100 Mpa. This value is confined between the values found in the osmotic buckling experiment [5] and recent AFM results [7] and requires further comments.…”

Section: Resultsmentioning

confidence: 53%

“…Typical fluorescence intensity profiles along the diameter of the capsules are presented in Fig.3 (bottom). We note that the level of fluorescence from the wall is higher than from the interior, which could be connected with some adsorption of the inner polyelectrolyte [17].…”

Section: Resultsmentioning

confidence: 73%

“…The first type are "filled" capsules prepared on manganese carbonate templates by a controlled precipitation [8,17], i.e. by an assembly of the inner layer of polyelectrolyte shell by means of multivalent ions with the subsequent extraction of these ions and polymer release into the capsule interior.…”

Section: Methodsmentioning

confidence: 99%

“…The behavior of this highly charged flexible polyanion in salt-free conditions has been studied both theoretically [15] and experimentally [10,11,19,20]. The value of ϕ for PSS was found to range from 0.2 to 1 and suggests some condensation of counter-ions [15,17].…”

Section: Methodsmentioning

confidence: 99%

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Young's Modulus of Polyelectrolyte Multilayers from Microcapsule Swelling

et al. 2004

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We measure Young's modulus of a free polyelectrolyte multilayer film by studying osmotically induced swelling of polyelectrolyte multilayer microcapsules filled with the polyelectrolyte solution. Different filling techniques and core templates were used for the capsule preparation. Varying the concentration of the polyelectrolyte inside the capsule, its radius and the shell thickness yielded an estimate of an upper limit for Young's modulus of the order of 100 MPa. This corresponds to an elastomer and reflects strong interactions between polyanions and polycations in the multilayer.

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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Young's Modulus of Polyelectrolyte Multilayers from Microcapsule Swelling

et al. 2004

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“…The next study concerning this concept was published by Decher [28,29] 25 years later who re-invented the idea using polyelectrolytes to layer oppositely charged surfaces. This method has then been successfully used for layering on flat surfaces, particles and emulsions using a variety of techniques [30][31][32][33][34][35][36][37][38]. 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.…”

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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