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Intraparticle transport and release of dextran in silica spheres with cylindrical mesopores
YKI – Ytkemiska institutet.
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2010 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, no 1, 466-470 p.Article in journal (Refereed)
Abstract [en]

The transport of oligomeric molecules in silica spheres with cylindrical mesopores has been quantified and related to the structural features of the spherical particles and the interactions at the solid-liquid interface. An emulsion-solvent evaporation method was used to produce silica spheres having cylindrical mesopores with an average pore diameter of 6.5 nm. The transport of dextran molecules (fluorescently tagged) with molecular weights of 3000 and 10 000 g/mol was quantified using confocal laser scanning microscopy (CLSM). The intraparticle concentration profiles in the dextrancontaining spheres were flat at all times, suggesting that the release is not isotropic and not limited by diffusion. The release of dextran into the solution is characterized by an initial burst, followed by long-term sustained release. The release follows a logarithmic time dependency, which was rationalized by coupling concentration-dependent effective diffusion constants with adsorption/desorption.

Place, publisher, year, edition, pages
2010. Vol. 26, no 1, 466-470 p.
Keyword [en]
Intraparticle transport and release of dextran in silica spheres with cylindrical mesopores
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27109DOI: 10.1021/la902092eOAI: oai:DiVA.org:ri-27109DiVA: diva2:1054113
Note
A2035Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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