I 2016

Investigation of the effect of malic acid addition on the glass-ionomer cement properties
Malic acid is a natural metabolite that is a part of the tricarboxylic acid cycle, which is common in nature and is used for example, in food and pharmaceutical industry. Malic acid belongs to a group of carboxylic hydroxyacids which are also used in stomatology as additives to glass-ionomer compositions. This paper presents the results of the research on the infl uence of addition of malic acid on properties of glass-ionomer compositions, which were obtained through mixing of glass-ionomer setting liquid with glass-ionomer powder component. For the research needs, glass-ionomer setting liquid was obtained based on synthesized copolymer solution of acrylic and itaconic acid, water and selected carboxylic hydroxyacids: tartaric acid, citric acid and malic acid. The evaluation of properties of obtained liquids was performed by determination of their viscosity, density and refraction index. Properties of the obtained glassionomer compositions were determined by measuring of their setting time and compressive strength. The results of the research show that addition of malic acid causes a decrease of viscosity of glass-ionomer setting liquid and an increase of setting time of glass-ionomer composition, in much higher degree than in case of addition of tartaric or citric acid, and it increases a compressive strength of cement. This information can be a basis for taking on further research on developing materials for new applications.
Monika Biernat Ph.D. Eng.

Capillary sensor with samarium doped core
The paper presents optical fiber sensor based on an optical fi ber capillary with a luminescent side ribbon. Siliceous core was doped with Sm3+ ions which ensure multi colour luminescence in visible spectrum (550-720 nm). The special fi bre construction allows to measure concentration of Rhodamine B (RhB) solution in rage of 0.01 - 0.15% ww. The sensitivity was obtained by using combination of measurements at 564 nm and 601 nm wavelengths and it reached -275•103 %-1. The use of certain wavelengths at measurement procedure allows to obtain the increase of selectivity and sensitivity of optrode. The results allow to reach the conclusion that the designed optrode has the ability to be used for construction of compact luminescent sensors, measuring selected properties of the solutions.
Agata Baranowska

Preparation of functional ceramics with the use of radical polymerization
Advanced ceramic materials currently represent a diverse group of materials which are becoming more widely used as the basis for electronic and automotive industry, cutting tools, abrasive elements, refractory elements of high quality, materials used in nuclear industry and medicine. In order to manufacture the above mentioned items, it is necessary to use ceramic raw materials of suitable properties, nevertheless the important stage of the production is the formation of the material, that is giving the shape of the fi nal product. There are many moulding methods used in ceramic technology but the limitations such as high energy-consumption, the possibility to obtain only simple geometries, long moulding time, etc. cause that the search for new moulding methods and improvement of already existing is far from being completed. One of the intensively studied forming methods is gelcasting which connects the traditional moulding from ceramic slips with polymer chemistry. The article presents the possibilities to use the reaction of radical polymerization in fabrication of both dense and porous functional ceramics. Through applying various organic additives to the colloidal ceramic suspensions it was possible to obtain ZTA composite of high density, porous Al2O3 ceramics and highly elastic ZrO2 tapes.
Paulina Wiecińska Ph.D. Eng., Mariola Bachonko M.Sc. Eng, Oksana Ryżyk Eng.

The influence of set of raw materials compaction on heat transfer and the process of melting glass
The manufacturing technology of glass is a multi-step process comprising: preparing a set, melting, refi ning and homogenizing of the alloy and molding. In order to convert a batch of raw material into a unifi ed, clear mass, chemical and physical changes must take place. These changes are insuffi cient contact between individual grains in set of raw materials. Liquid amorphous phase appearing in the fi rst stage of melting raw mix, by combining grains with thin webs, facilitates better contact between them. The paper presents the effect of the degree of compaction of raw mix on the reaction rate and the amount of amorphous phase forming. For this purpose, a commercial batch of raw materials was compacted at three different pressures: 0,2 MPa, 15 MPa and 40 MPa, followed by annealing process at temperatures: 800°C, 1100°C and 1200°C.
Anna Zawada Ph.D. Eng., Iwona Przerada Ph.D. Eng