Journal article
Transport through self-assembled colloidal shells (colloidosomes)
Current opinion in colloid & interface science, v 17(3), pp 141-146
Jun 2012
Abstract
Colloidosomes, namely, microcapsules coated by a colloidal shell, have been widely studied as potential carriers of active compounds for various applications. The colloidal shell differs from the shells of other ‘somes’ (liposomes, polymersomes) since it is a composite material with an impenetrable phase—the particles, and a penetrable one—the voids or pores between them. Recent analysis shows that in the shells composed of monodisperse and charged particles, the maximal volume fraction of colloids in the self-assembled layer depends on the size ratio between the particle's hard-sphere radius and the effective radius, which includes the range of repulsive electrostatic interactions. Thus, somewhat counter-intuitively, the density of particles in the shell increases with increasing particle radius. However, mixing particle sizes can lead to highly packed shells where the impenetrable phase volume fraction approaches 100%. The diffusional flux through the colloidal shell is highly sensitive to the packing density (or particle volume fraction); this parameter sets the average size of the pores, their distribution through the shell, and their tortuosity. However, while in thick multi-layer shells the flux increases with increasing particle size, in the case of monolayer-thick shells there is no apparent dependence of the flux on the colloid dimensions.
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► Colloidosome shell structure is set by adsorption. Packing density depends on particle size, size distribution, and electrostatic interactions. ► Colloidosome shells are a composite containing an impenetrable phase (particles) dispersed through a penetrable phase (voids or pores). ► Diffusional flux through colloidosome is sensitive to the particle volume fraction, but insensitive to particle size in monolayer-thick shells. ► The diffusional flux in multi-layered shells increases with increasing particle size.
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Details
- Title
- Transport through self-assembled colloidal shells (colloidosomes)
- Creators
- Nily Dan - Drexel University
- Publication Details
- Current opinion in colloid & interface science, v 17(3), pp 141-146
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Web of Science ID
- WOS:000304290000004
- Scopus ID
- 2-s2.0-84860001967
- Other Identifier
- 991019312377404721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical