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Percolating ion transport in binary mixtures with high dielectric loss
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.ORCID-id: 0000-0002-5496-9664
2006 (engelsk)Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 88, artikkel-id 214103Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We investigate the ion transportpercolationproperties of a binary system of an ion conductor (NaCl) and an insulator (ethyl cellulose) for which the ac component of the conductivity is non-negligible over the entire measured frequency range. We find that the dc conductivity, extracted from a well-defined range of frequencies, can be described by a low percolation threshold, ϕc=0.06 three-dimensional conducting network. The low ϕc was explained by the water-layer-assisted ion conduction in micrometer-sized ethyl cellulose channels between NaCl grains. The present findings provide valuable knowledge for the analysis and design of a broad class of ion conducting functional materials.

sted, utgiver, år, opplag, sider
2006. Vol. 88, artikkel-id 214103
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-95751DOI: 10.1063/1.2201556OAI: oai:DiVA.org:uu-95751DiVA, id: diva2:170082
Tilgjengelig fra: 2007-04-13 Laget: 2007-04-13 Sist oppdatert: 2017-12-14bibliografisk kontrollert
Inngår i avhandling
1. Drug Diffusion and Nano Excipient Formation Studied by Electrodynamic Methods
Åpne denne publikasjonen i ny fane eller vindu >>Drug Diffusion and Nano Excipient Formation Studied by Electrodynamic Methods
2007 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

New smart drugs demand new smart drug delivery systems and also new smart analysis methods for the drug delivery process and material characterization. This thesis contributes to the field by introducing a new electrodynamic approach for studying the drug diffusion proc-esses as well as the formation of a new type of drug delivery systems, the so called mesoporous nano excipients.

Drug diffusion processes from different pharmaceutical materials were examined. The transport of charged drug substances was investigated by electrodynamic methods; either as a release process governed by diffusion using the alternating ionic current method or by applying a voltage, sinusoidal or dc, to force the drug ions to move in an electric field.

Temperature-dependent drug release from microcrystalline cellulose tablets was examined in order to extract information about the diffu-sion process. Percolation theory was also employed to binary mixtures of an insoluble and electrically insulating matrix material together with a soluble and ionic conducting drug. Further, dielectric spectros-copy was proven to be a powerful method for examining the state of vesicle formation of drug and surfactant molecules in a carbopol gel. Finally, a new potential class of pharmaceutical materials were exam-ined, namely the AMS-n mesoporous materials, showing that the al-ternating ionic current method is powerful both in the study of the synthesis of and in the release process from these.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2007. s. 73
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 293
Emneord
Functional materials, drug release, electrodynamic methods, diffusion, Funktionella material
Identifikatorer
urn:nbn:se:uu:diva-7818 (URN)978-91-554-6864-4 (ISBN)
Disputas
2007-05-07, 2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:00
Opponent
Veileder
Tilgjengelig fra: 2007-04-13 Laget: 2007-04-13 Sist oppdatert: 2015-09-11bibliografisk kontrollert

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