This work studies the morphological characteristics of four different laboratories synthesized nanolime dispersions, focusing on the characteristics of the polar dispersion medium and the increase of the water content in the final dispersion. An innovation of this research is the incorporation of distilled water that is enriched with O₂ nanobubbles (NBs) as an alternative aqueous dispersion medium, with a potential of surfactant action. The evaluation of the dispersions was based on the morphological, chemical and the mineralogical characterization of nanoparticles, their stability and their penetration potential in two porous substrates. The use of the 2-propanol resulted in the reduction of nanoparticle size and the absence of agglomerates. The combined use of 2-propanol and distilled water enriched with O₂ NBs was considered also beneficial since it resulted in dispersions with slightly reduced kinetic stability but, with enhanced penetration in the porous substrates.

Estella Weiss-Krejci, Barbara Horejs Editorial – 7 Artikel / Articles Brigitta Mader Zwischen Stillstand und Aufschwung. Die Prähistorische Kommission der Österreichischen Akademie der Wissenschaften von 1918 bis 1938 – 11 Wolfgang F. A. Lobisser, Daniela Kern Lanze, Pfriem und Muschelschmuck. Experimentelle Nachbauten von Objekten aus tierischen Rohstoffen nach Originalen aus endneolithischen Gräbern des Unteren Traisentals – 45 Eleftheria Kardamaki The Late Helladic IIB to IIIA2 Pottery Sequence from the Mycenaean Palace at Ayios Vasileios, Laconia – 73 Berichte / Reports Robert Schumann Ein außergewöhnliches Fundensemble aus dem Bereich eines spätbronze-/urnenfelderzeitlichen Bestattungsplatzes bei Tarsdorf, Bezirk Braunau am Inn, Oberösterreich. Vorbericht zur Fundbergung 2010 und zur Grabung 2012 – 145 Themenspecial / Special SectionAda Tepe und die Rhodopen in der Spätbronzezeit / Ada Tepe and the Rhodopes in the Late Bronze Age Hristo Popov, Marina Koleva, Antoaneta Andonova, Jana Dimitrova, Ivan Vălčev Das Goldbergwerk auf dem Ada Tepe. Zu Topografie, Stratigrafie, Chronologie und Interpretation des Nordareals – 161 Barbara Horejs Zum Alltagsleben der Ada Tepe Goldproduzenten im 15. Jh. v. Chr. Das Fundensemble aus Haus 7 in funktionaler und kontextueller Analyse – 205 Reinhard Jung, Stefan Alexandrov, Elena Bozhinova, Hans Mommsen mit einem Appendix von Anno Hein und Vassilis Kilikoglou Mykenische Keramik in der Rhodopenregion. Herkunft, regionaler Kontext und sozialökonomische Grundlagen – 269 Nachruf / Obituary Barbara Horejs Bernhard Hänsel und die Berliner Schule. Ein Nachruf auf einen großen europäischen Archäologen – 305 Rezensionen / Reviews

Two gallium porphyrins, a tetraphenyl GaCl porphyrin, termed as (TPP)GaCl, and an octaethylporphyrin GaCl porphyrin, termed as (OEP)GaCl, were synthesized to use as an electron cascade in ternary organic bulk heterojunction films. A perfect matching of both gallium porphyrins’ energy levels with that of poly(3-hexylthiophene-2,5-diyl) (P3HT) or poly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) polymer donor and the 6,6-phenyl C₇₁ butyric acid methyl ester (PCBM) fullerene acceptor, forming an efficient cascade system that could facilitate electron transfer between donor and acceptor, was demonstrated. Therefore, ternary organic solar cells (OSCs) using the two porphyrins in various concentrations were fabricated where a performance enhancement was obtained. In particular, (TPP)GaCl-based ternary OSCs of low concentration (1:0.05 vv%) exhibited a ~17% increase in the power conversion efficiency (PCE) compared with the binary device due to improved exciton dissociation, electron transport and reduced recombination. On the other hand, ternary OSCs with a high concentration of (TPP)GaCl (1:0.1 vv%) and (OEP)GaCl (1:0.05 and 1:0.1 vv%) showed the poorest efficiencies due to very rough nanomorphology and suppressed crystallinity of ternary films when the GaCl porphyrin was introduced to the blend, as revealed from X-ray diffraction (XRD) and atomic force microscopy (AFM). The best performing devices also exhibited improved photostability when exposed to sunlight illumination for a period of 8 h than the binary OSCs, attributed to the suppressed photodegradation of the ternary (TPP)GaCl 1:0.05-based photoactive film.

This work presents the methodological approach followed for the study of the interaction of natural stone monuments with the local microclimate (exposure to RH, temperature alterations, wind, marine aerosol). This was implemented with the documentation of the associated weathering phenomena and the study of historic climate data of the area. The paper is focused on the main weathering mechanisms of the marly limestone at the Hellenistic theater of Zea in Piraeus, Greece. Based on the weathering phenomena identified, the development of the appropriate mitigation strategy was based on the physical, chemical and mechanical characterization of the natural stones, along with the evaluation of different conservation treatments, considering the characteristics of the coastal environment. Considering the mineralogy of marly limestones, silane-based materials were selected for providing both consolidation and water repellency effects. The evaluation of the conservation treatments was based on the modification of microstructural and water-related properties of natural stone samples, along with their consequent effect on their durability against accelerated aging tests. The results indicated that the design of migration actions proved to be multivariable parameter, depending on the intrinsic stone properties, the environmental parameters and the conservation efficacy of the treatments.