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- Karlsson, Christoffer, et al.
(författare)
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Stable Deep Doping of Vapor-Phase Polymerized Poly(3,4-ethylenedioxythiophene)/Ionic Liquid Supercapacitors.
- 2016
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Ingår i: ChemSusChem. - : Wiley. - 1864-5631 .- 1864-564X. ; 9:16, s. 2112-2121
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Tidskriftsartikel (refereegranskat)abstract
- Liquid-solution polymerization and vapor-phase polymerization (VPP) have been used to manufacture a series of chloride- and tosylate-doped poly(3,4-ethylenedioxythiophene) (PEDOT) carbon paper electrodes. The electrochemistry, specific capacitance, and specific charge were determined for single electrodes in 1-ethyl-3-methylimidazolium dicyanamide (emim dca) ionic liquid electrolyte. VPP-PEDOT exhibits outstanding properties with a specific capacitance higher than 300 F g(-1) , the highest value reported for a PEDOT-based conducting polymer, and doping levels as high as 0.7 charges per monomer were achieved. Furthermore, symmetric PEDOT supercapacitor cells with the emim dca electrolyte exhibited a high specific capacitance (76.4 F g(-1) ) and high specific energy (19.8 Wh kg(-1) ). A Ragone plot shows that the VPP-PEDOT cells combine the high specific power of conventional ("pure") capacitors with the high specific energy of batteries, a highly sought-after target for energy storage.
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- Keskinen, Jari, et al.
(författare)
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Asymmetric and symmetric supercapacitors based on polypyrrole and activated carbon electrodes
- 2015
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Ingår i: Synthetic metals. - : Elsevier BV. - 0379-6779 .- 1879-3290. ; 203, s. 192-199
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Tidskriftsartikel (refereegranskat)abstract
- Abstract Supercapacitors were prepared using either two polypyrrole (PPy) composite electrodes or one PPy composite and one activated carbon electrode. The PPy composite electrodes were either freestanding paper-like sheets or PPy films printed on graphite ink coated aluminium/PET laminate substrates, using Cladophora algae derived cellulose as the substrate or binder, respectively. The specific capacitance of the PPy electrodes was found to be about 200 F g−1 depending on the manufacturing method, yielding supercapacitors with capacitances between 0.45 and 3.8 F and energy efficiencies of over 90%. For an asymmetric device with activated carbon positive electrode and PPy negative electrode a capacitance loss of 5% was seen after 14300 cycles.
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- Pochard, Isabelle, et al.
(författare)
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Amine-functionalised mesoporous magnesium carbonate : Dielectric spectroscopy studies of interactions with water and stability
- 2018
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Ingår i: Materials Chemistry and Physics. - : ELSEVIER SCIENCE SA. - 0254-0584 .- 1879-3312. ; 216, s. 332-338
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Tidskriftsartikel (refereegranskat)abstract
- A mesoporous magnesium carbonate (MMC) material that was first described in 2013 is currently being investigated for several industrial and life-science-based applications. In this paper, the effect of functionalising the surface of MMC with amine groups on the water interaction properties of the material is investigated in detail. Amine functionalisation enhanced the stability and water sorption-release properties of the material. This is explained by the low affinity between amine-functionalised MMC and water molecules, as attested by the high free/total water ratio shown by dielectric spectroscopy. This low affinity had an impact on the total amount of adsorbed water at low relative humidities (RHs) but not at high RHs. The functionalisation of MMC with amine groups also stabilised the material in moist environments, hindering spontaneous crystallisation. These results provide a more fundamental understanding of the water interaction properties of MMC and are also expected to facilitate optimisation of the stability of materials like this for novel drug formulations and other life-science applications, as well as for their use in humidity control.
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- Rostedt Punga, Anna, et al.
(författare)
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Flodvåg av långtidssjuka covid-19-patienter väntar
- 2020
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Ingår i: Dagens Nyheter. - : Dagens Nyheter. - 1101-2447. ; , s. 5-5
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Hittills har sjukvård och forskning fokuserat på de som är svårt sjuka i covid-19. Samhällsspridningen i Sverige gör att även primärvården måste förbereda sig på ett stort antal patienter med komplexa och långdragna symtom. Nu publiceras en av de första vetenskapliga fallbeskrivningarna av en långtidssjuk patient, skriver forskare vid Uppsala universitet.
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- Sörensen, Jan H, et al.
(författare)
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Co-precipitation of Tobramycin into Biomimetically Coated Orthopedic Fixation Pins Employing Submicron-Thin Seed Layers of Hydroxyapatite
- 2014
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Ingår i: Current Drug Delivery. - : Bentham Science Publishers Ltd.. - 1567-2018 .- 1875-5704. ; 11:4, s. 501-510
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Tidskriftsartikel (refereegranskat)abstract
- Implant migration, loosening and cut-out as well as nosocomial infections are current problems during surgery. New innovative strategies to overcome these issues are emphasized in today's research. The currentwork presents a novel strategy involving co-precipitation ofTobramycin with biomimetic hydroxyapatite (HA) formation to produce implant coatings that may ensure controlled local drug delivery to prevent early bacterial colonization of the implant. A sub-micron thin HA layer served as seed layer for the co-precipitation process and allowed for incorporation of Tobramycin in the coating from a stock solution of antibiotic concentrations as high as 20 mg/ml. Concentrations from 0.5 to 20 mg/ml Tobramycin and process temperatures of 37 °C and 60 °C were tested to assess the optimal parameters resulting in a thin Tobramycin delivering HA coating on discs and orthopedic fixation pins. The coating morphology and thickness as well as drugrelease profile were evaluated via scanning electron microscopy and high performanceliquid chromatography. The coatings were found to deliver pharmaceutically relevant amounts of Tobramycinover a period as of12 days. To the best of our knowledge, this is the longest release period ever observed for a fast-loaded biomimetic implant coating. The presented approach may form thefoundation for development of combination device/antibiotic delivery vehicles tailored to meet well-defined clinical needs combatting infections and ensuring fast implant in-growth.
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