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  • 1.
    Brobbey, Kofi
    et al.
    Åbo Akademi University, Finland.
    Haapanen, Janne
    Tampere University of Technology, Finland.
    Mäkelä, Jyrki
    Tampere University of Technology, Finland.
    Gunell, Marianne
    University of Turku, Finland.
    Eerola, Erkki
    University of Turku, Finland.
    Rosqvist, Emil
    Åbo Akademi University, Finland.
    Peltonen, Jouko
    Åbo Akademi University, Finland.
    Saarinen, Jarkko
    University of Eastern Finland, Finland.
    Tuominen, Mirkko
    RISE - Research Institutes of Sweden, Biovetenskap och material, Yta, process och formulering.
    Toivakka, Martti
    Åbo Akademi University, Finland.
    Effect of plasma coating on antibacterial activity of silver nanoparticles2019Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 672, s. 75-82Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Silver nanoparticles (NPs) are known to provide antimicrobial properties for surfaces. However, there are environmental concerns due to reports of toxicity after exposure to the environment during or after end-use. Immobilizing silver NPs to the surface of substrates could ensure that particles are readily available for antibacterial activity with limited environmental exposure. A plasma coating on top of silver NPs could improve the adhesion of NPs to a substrate, but it could also impede the release of silver NPs completely. Furthermore, silver has been shown to require direct contact to demonstrate antibacterial activity. This study demonstrates immobilization of silver NPs with plasma coating onto a surface while maintaining its antibacterial properties. Silver NPs are simultaneously synthesized and deposited onto a surface with liquid flame spray aerosol technique followed by hexamethyldisiloxane plasma coating to immobilize the NPs. Atomic force microscope scratch testing is used to demonstrate improved nanoparticle adhesion. Antibacterial activity against gram-negative Escherichia coli is maintained even for plasma coating thicknesses of 195 nm. NP adhesion to the surface is significantly improved. Gram-positive Staphylococcus aureus was found be resistant to all the plasma-coated samples. The results show promise of using plasma coating technology for limiting NP exposure to environment.

  • 2.
    Diler, Erwan
    et al.
    RISE - Research Institutes of Sweden, Material och produktion, KIMAB. Laboratoire de Magnétisme de Bretagne, France.
    Rioual, Stephane
    Laboratoire de Magnétisme de Bretagne, France.
    Lescop, Benoit
    Laboratoire de Magnétisme de Bretagne, France.
    Thierry, Dominique
    RISE - Research Institutes of Sweden, Material och produktion, KIMAB.
    Rouvellou, B.
    Laboratoire de Magnétisme de Bretagne, France.
    Stability of ZnMgO oxide in a weak alkaline solution2012Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 520, nr 7, s. 2819-2823Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Zinc oxide (ZnO) is a chemical compound of great interest used, for example, as photocatalyst in the purification of wastewater or polluted air. However, neither dissolution, nor photo-dissolution of ZnO is negligible: indeed, both processes reduce significantly the efficiency of photocatalysis and then lead to a secondary pollution by free Zn 2 +. In the present study, the stability of ZnMgO thin films in weak alkaline solution is investigated. We demonstrate that the replacement of Zn 2 + ion with Mg 2 + ion results in the production of a Zn 0.84Mg 0.16O solid solution, whose stability is higher than that of the ZnO sample. This alloy, thus, constitutes an alternative to the use of ZnO in photocatalysis applications. To gain more insights into the higher resistance of such alloys to the dissolution process, X-Ray photoelectron spectroscopy measurements were performed. They highlighted the role of OH group adsorption in the experimentally observed enhancement of ZnMgO stability.

  • 3. Granstrom, J.
    et al.
    Gällstedt, Mikael
    RISE., Innventia.
    Villet, M.
    Moon, J.S.
    Chatterjee, T.
    High performance encapsulation structures utilizing Russian Doll architectures2010Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 518, nr 18, s. 5282-5287Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A Russian Doll encapsulation architecture utilizing pairs of free-standing barrier films and epoxy seals separated by nitrogen spacers is presented, enabling the use of low-cost epoxy to attach two or more free-standing barrier films to a substrate with improved barrier performance. The performance of various Russian Doll encapsulations was evaluated with the calcium thin film optical transmission test, showing improved performance of the Russian doll configuration relative to a non-nested barrier/spacer architecture, and demonstrating that water vapor transmission rates (WVTR) of 0.00021 g/(m 2, day) or below can be achieved with low-cost materials in this architecture. This WVTR correlates to a predicted lifetime of more than 10 years for bulk heterojunction solar cell modules fabricated and tested by Konarka Technologies (Lowell, MA, USA)..

  • 4.
    Sundberg, Peter
    et al.
    RISE - Research Institutes of Sweden, Samhällsbyggnad, Byggteknik.
    Bäck, Lina
    RISE - Research Institutes of Sweden, Samhällsbyggnad, Byggteknik.
    Orman, Robin
    Johnson Matthey Technology Centre, UK.
    Booth, Jonathan
    Johnson Matthey Technology Centre, UK.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden, Samhällsbyggnad, Byggteknik.
    Simultaneous chemical vapor deposition and thermal strengthening of glass2019Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 669, s. 487-493Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In the current paper we present a concept combining metal organic chemical vapor deposition with thermal strengthening process of flat glass. As the flat glass is heated to be thermally strengthened, which takes up to 20 minutes, there is an opportunity for performing a surface modification. We describe the application of transparent and amorphous Al2O3 thin films during the thermal strengthening process. Al2O3 was chosen due to the following desirable properties: increased surface mechanical properties and increased chemical durability, the latter has not been investigated in the current paper. The residual surface compressive stresses after performed strengthening of the coated glasses were quantified to be in the range of 80-110 MPa. The Al2O3 content in the surface was measured using the Surface Ablation Cell employed with Inductively Coupled Plasma Atomic Emission Spectroscopy and found to be at least doubled at the surface and having an increased Al2O3 content at least 0.5 mu m underneath the glass surface. During the surface reaction, sodium is migrating to the surface giving a hazy salt layer on the glass which can easily be washed off with water. The applied coatings are transparent and provide increased surface hardness and crack resistance at low indentation loads. At higher indentation loads the interaction volume is larger and displays the same effect on the surface mechanical properties as for thermally strengthened glass. The contact angle with water compared to annealed float glass is significantly increased from 5 degrees to 45 degrees due to the different surface chemistry and surface topography.

  • 5.
    Sundberg, Peter
    et al.
    RISE - Research Institutes of Sweden, Biovetenskap och material, Kemi och material.
    Grund Bäck, Lina
    RISE - Research Institutes of Sweden, Samhällsbyggnad, Byggteknik.
    Orman, Robin
    Johnson Matthey Technology Centre, UK.
    Booth, Jonathan
    Johnson Matthey Technology Centre, UK.
    Karlsson, Stefan
    RISE - Research Institutes of Sweden, Samhällsbyggnad, Byggteknik.
    Simultaneous chemical vapor deposition and thermal strengthening of glass2018Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 669, nr 1, s. 487-493Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In the current paper we present a concept combining metal organic chemical vapor deposition with thermal strengthening process of flat glass. As the flat glass is heated to be thermally strengthened, which takes up to 20 minutes, there is an opportunity for performing a surface modification. We describe the application of transparent and amorphous Al2O3 thin films during the thermal strengthening process. Al2O3 was chosen due to the following desirable properties: increased surface mechanical properties and increased chemical durability, the latter has not been investigated in the current paper. The residual surface compressive stresses after performed strengthening of the coated glasses were quantified to be in the range of 80–110 MPa. The Al2O3 content in the surface was measured using the Surface Ablation Cell employed with Inductively Coupled Plasma Atomic Emission Spectroscopy and found to be at least doubled at the surface and having an increased Al2O3 content at least 0.5 μm underneath the glass surface. During the surface reaction, sodium is migrating to the surface giving a hazy salt layer on the glass which can easily be washed off with water. The applied coatings are transparent and provide increased surface hardness and crack resistance at low indentation loads. At higher indentation loads the interaction volume is larger and displays the same effect on the surface mechanical properties as for thermally strengthened glass. The contact angle with water compared to annealed float glass is significantly increased from 5° to 45° due to the different surface chemistry and surface topography.

    Publikationen är tillgänglig i fulltext från 2020-11-28 08:05
  • 6. Zhang, F
    et al.
    Pan, J
    Claesson, Per M
    YKI – Ytkemiska institutet.
    Brinck, T
    Electrochemical, atomic force microscopy and infrared reflection absorption spectroscopy studies of pre-formed mussel adhesive protein films on carbon steel for corrosion protection2012Ingår i: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 520, nr 24, s. 7136-7143Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Electrochemical measurements, in situ and ex situ atomic force microscopy (AFM) experiments and infrared reflection absorption spectroscopy (IRAS) analysis were performed to investigate the formation and stability as well as corrosion protection properties of mussel adhesive protein (Mefp-1) films on carbon steel, and the influence of cross-linking by NaIO 4 oxidation. The in situ AFM measurements show flake-like adsorbed protein aggregates in the film formed at pH 9. The ex situ AFM images indicate multilayer-like films and that the film becomes more compact and stable in NaCl solution after the cross-linking. The IRAS results reveal the absorption bands of Mefp-1 on carbon steel before and after NaIO 4 induced oxidation of the pre-adsorbed protein. Within a short exposure time, a certain corrosion protection effect was noted for the pre-formed Mefp-1 film in 0.1 M NaCl solution. Cross-linking the pre-adsorbed film by NaIO 4 oxidation significantly enhanced the protection efficiency by up to 80%.

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