III 2015

The expression of brick facades on the example of the German and Austrian architecture     
The text is about an application of bricks as a buildings' façades primary material. It is characterized for example by a style known in architecture as "Backsteinexpressionismus", occurring mainly in German-speaking territories. The article has so to decide if the brick façades are popular according to pragmatism or the historical and cultural circumstances. The examples of the design for different brick surfaces suggest that this building-material may be the primary means of expression of an architectural form.
Aleksander Serafin Ph.D. Eng.

The Grodziec Collection – analysis, conservation and restoration of three stained-glass panels from the National Museum in Wrocław.
The paper concerns three stained glass panels from the National Museum in Wroclaw, which have undergone a conservation/restoration treatment. The preliminary results of the analysis performed by means of modern analytical methods such as X-ray fl uorescence macro scanner MA-XRF, are outlined. The general conservation/restoration treatment is described, with a particular emphasis on the esthetical matter.
Marta Kamińska M.Sc.

Microwave solvothermal synthesis of Co-doped ZnO nanoparticles
Co-doped zinc oxide nanoparticles were prepared by microwave solvothermal synthesis (MSS) technique. The nanoparticles were produced from a solution of zinc acetate and cobalt (II) acetate using ethylene glycol as a solvent. The content of Co2+ in Zn1-xCoxO was in range of 1–15% mol. The following material nanostructure properties were investigated: skeleton density, specifi c surface area (SSA), phase purity (XRD), lattice parameter, dopant content, average particle size, particle size distribution and morphology. X-ray diffraction of synthesized samples showed a single phase ZnO nanostructure without indication of alien phases. Obtained Zn1-xCoxO composed of loose spherical particles with wurtzite crystal structure and average particle size 30 nm. SEM images didn’t show impact of increase of dopant content on morphology of nanoparticles.
Jacek Wojnarowicz M.Sc.Eng.

Identification of the phenomenon of discoloration on Low-E coating of glass pane used in insulated glass units and its elimination
The article analyses different types of insulated glass units, which had been previously for some time a part of the facade of buildings. The first stage focuses on understanding the nature of the defect. There was checked infl uence of climatic conditions and physical processes (thermal bridges in IGU) on discoloration, and whether this type of defect is permanent. Comparative studies of the chemical composition of glass pieces with defect on the coating, and pieces of glass without the defects, have allowed the identifi cation of elements causing discoloration on the Low-E coating. Subsequently in the next stages of work research of various components of IGU which may contribute to the formation of discoloration were carried out. As a result components responsible for this phenomenon were identifi ed. In order to find a way to minimize or entirely eliminate discoloration effect research of different types of IGU were carried out. Depending on the IGU construction probabilities of defect occurrence were estimated.
Sławomir Pabian M.Sc Eng.