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Nilsson, Martin
Publications (5 of 5) Show all publications
Nilsson, M. (2006). Conductance phenomena in microcrystalline cellulose.. Phys. Stat. Sol., (c) 3, 251-254
Open this publication in new window or tab >>Conductance phenomena in microcrystalline cellulose.
2006 (English)In: Phys. Stat. Sol., Vol. (c) 3, p. 251-254Article in journal (Refereed) Published
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-24892 (URN)
Available from: 2007-02-08 Created: 2007-02-08 Last updated: 2018-06-04
Nilsson, M., Mihranyan, A., Valizadeh, S. & Strömme, M. (2006). Mesopore structure of microcrystalline cellulose tablets characterized by nitrogen adsorption and SEM: The influence on water-induced ionic conduction. Journal of Physical Chemistry B, 110(32), 15776-15781
Open this publication in new window or tab >>Mesopore structure of microcrystalline cellulose tablets characterized by nitrogen adsorption and SEM: The influence on water-induced ionic conduction
2006 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 110, no 32, p. 15776-15781Article in journal (Refereed) Published
Abstract [en]

Tablets of microcrystalline cellulose were formed at different compaction pressures and physical properties, such as pore size distribution, surface area, and pore surface fractality, were extracted from N-2 adsorption isotherms. These properties were compared to previously published data on the water-induced ionic conductivity of the tablets. The conduction process was shown to follow a percolation model with a percolation exponent of 2 and a porosity percolation threshold of similar to 0.1. The critical pore diameter for facilitated charge transport was shown to be in the 5-20 nm range. When the network of pores with a diameter in this interval is reduced to the point where it no longer forms a continuous passageway throughout the compact, the conduction process is dominated by charge transport on the surfaces of individual microfibrils mainly situated in the bulk of fibril aggregates. A fractal analysis of nitrogen adsorption isotherms showed that the dominant interface forces during adsorption is attributed to surface tensions between the gas and the adsorbed liquid phase. The extracted fractal dimension of the analyzed pore surfaces remained unaffected by the densification process at low compaction pressures (< similar to 200 MPa). At increased densification, however, pore-surface structures smaller than similar to 100 nm become smoother as the fractal dimension decreases from similar to 2.5 at high porosities to similar to 2.3 for the densest tablets under study.

National Category
Engineering and Technology Pharmaceutical Sciences
Identifiers
urn:nbn:se:uu:diva-94365 (URN)10.1021/jp055858v (DOI)000239656100023 ()16898725 (PubMedID)
Available from: 2006-04-21 Created: 2006-04-21 Last updated: 2018-06-04Bibliographically approved
Nilsson, M. & Strömme, M. (2005). Conduction phenomena in microcrystalline cellulose. In: TIDS11 - 11th Conference on Transport in Interacting and Disordered Systems: TIDS11 - 11th Conference on Transport in Interacting and Disordered Systems, Egmond aan Zee, The Netherlands, August 21-26 2005, TIDS11 Book of Abstracts (pp. 45).
Open this publication in new window or tab >>Conduction phenomena in microcrystalline cellulose
2005 (English)In: TIDS11 - 11th Conference on Transport in Interacting and Disordered Systems: TIDS11 - 11th Conference on Transport in Interacting and Disordered Systems, Egmond aan Zee, The Netherlands, August 21-26 2005, TIDS11 Book of Abstracts, 2005, p. 45-Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-10650 (URN)
Available from: 2007-04-18 Created: 2007-04-18 Last updated: 2018-06-04
Frenning, G., Nilsson, M. & Strømme, M. (2004). A generalized regular singular-point description of low-frequency dielectric responses. Phys. Rev. B, 70, 012506-1
Open this publication in new window or tab >>A generalized regular singular-point description of low-frequency dielectric responses
2004 (English)In: Phys. Rev. B, Vol. 70, p. 012506-1Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-70380 (URN)
Available from: 2005-04-21 Created: 2005-04-21 Last updated: 2011-01-12
Brohede, U., Nilsson, M. & Strömme, M. (2004). The importance of water-cellulose interactions for the drug release process. In: The Swedish Academy of Pharmaceutical Sciences conference “Styrning av läkemedelstillförsel aktuell svensk forskning” 2-3 June, Göteborg, contribution P9 (2004).
Open this publication in new window or tab >>The importance of water-cellulose interactions for the drug release process
2004 (English)In: The Swedish Academy of Pharmaceutical Sciences conference “Styrning av läkemedelstillförsel aktuell svensk forskning” 2-3 June, Göteborg, contribution P9 (2004), 2004Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:uu:diva-72016 (URN)
Available from: 2005-05-17 Created: 2005-05-17 Last updated: 2016-11-30
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