2001
DOI: 10.1021/nl0100015
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Abstract: Stable hollow polyelectrolyte capsules were produced by means of the layer-by-layer assembling of poly(allylamine), PAH, and poly-(styrenesulfonate), PSS, on melamine formaldehyde microcores followed by the core decomposition at low pH. These capsules are nonpermeable for urease in water and become permeable in a water/ethanol mixture. The capsules were loaded with urease in water/ethanol mixture and then resuspended in water. The urease molecules are kept in the capsule, whereas the small urea molecules rapid… Show more

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Cited by 457 publications
(420 citation statements)
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“…For instance, the wall permeability of microcapsules fabricated by LbL nanoassembly can be reversely switched from the open state to the closed state through the variation in pH or through the variation in the solvent polarity. 20,21 When the microcapsules are inside a solution with low pH or inside a solution with ethanol, the polyelectrolyte network of their walls swells and thus becomes permeable. As a result, the microcapsules are in an open state.…”
Section: B Controlled Drug Release In Dropletsmentioning
confidence: 99%
“…For instance, the wall permeability of microcapsules fabricated by LbL nanoassembly can be reversely switched from the open state to the closed state through the variation in pH or through the variation in the solvent polarity. 20,21 When the microcapsules are inside a solution with low pH or inside a solution with ethanol, the polyelectrolyte network of their walls swells and thus becomes permeable. As a result, the microcapsules are in an open state.…”
Section: B Controlled Drug Release In Dropletsmentioning
confidence: 99%
“…The LMMNP bioreactors were prepared by using the layerby-layer self-assembly technique [27,28]. This immobilization approach based on electrostatic adsorption was simple and rapid compared with chemical modification techniques.…”
Section: Preparation Of Lmmnp Bioreactorsmentioning
confidence: 99%
“…This is due to several reasons: This last property is exploited to reversibly change the permeability of the capsule wall, 'opening' the capsules during which the capsules are loaded with molecules of interest followed by 'closing' of the capsules resulting in the entrapment of the molecules of interest. [39][40][41] This is shown in Figure 5 where a combination of adding salt and heating is applied to encapsulate 70 kDa FITC-dextran into (PDADMAC/PSS) 4 microcapsules. [42] Figure 5a demonstrates that under conditions of low ionic strength the FITC-dextran cannot diffuse through the polyelectrolyte shell.…”
Section: Post-loading Strategiesmentioning
confidence: 99%