Technical Transactions iss. 4. Chemistry iss. 1-Ch

Technical Transactions iss. 4. Chemistry iss. 1-Ch

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Collection items (14)


Zinc sulphide (ZnS) nanparticles for advanced application

Żaba, Adam, Sovinska, Svitlana, Kasprzyk, Wiktor, Bogdał, Dariusz, Matras-Postołek, Katarzyna
Article
2016
Zinc sulphide (ZnS) is one of the first discovered semiconducting materials, which due to their unique properties can be applied in optoelectronic devices, such as ultraviolet-light-emitting diodes, flat-panel displays, electroluminescent and sensors. As we present in this short review, the properties of ZnS are highly dependent on their size, structural form and morphology. Nowadays, one-dimensional (1D) structures of ZnS have been of great interest, mainly due to their luminescent and electrical properties.

Synthesis and mechanical properties of novel epoxy-polyurethane materials based on modified soybean oil

Sienkiewicz, Anna, Czub, Piotr
Article
2016
The paper presents the results of studies on the synthesis and mechanical properties of the fusion product of epoxidized soybean oil with bisphenol A, which are a part of the current research on environmentally friendly raw materials for the preparation and modification of modern polymeric materials. It has been shown that the use of 4,4’-methylene diphenyl diisocyanate in the cross-linking process of the fusion product in the presence of Dabco 33-LV and BYK-A530 or BYK-A525 gives hard materials with interesting mechanical properties.

Cooling of hot water with non-uniform initial temperature

Neupauer, Krzysztof, Komorowicz, Tadeusz, Kupiec, Krzysztof
Article
2016
A mathematical model of water cooling in a vertical tank with non-uniform initial temperature has been presented in this paper. This kind of process is important in solar installations. Calculation results for various cases comprising, among others, two or three layers of water with different initial process temperatures as well as various combinations of heat resistance of the side wall, the tank bottom and the tank cover, have been given as well.

Nanoemulsions based on selected berry seed oils

Miastkowska, Małgorzata, Sikora, Elżbieta, Ogonowski, Jan
Article
2016
The aim of this work was the preparation of O/W nanoemulsions based on supercritical CO2 extracted (SC-CO2) oils from seeds of strawberry and blackcurrant. The emulsion systems were obtained by the phase inversion composition method, at T = 25°C. Polysorbate 80 and Natragem S150 were used as the surfactant and co-surfactant, respectively. Kinetic stability of the prepared formulations with varying surfactant: oil (S:O) and surfactant/co-surfactant (S/CoS) weight ratio, was analysed by measuring the droplet size (DLS method) in time. The obtained results show that a nanoemulsion based on blackcurrant seed oil was characterised by the smallest droplet size (r = 15 nm), a low polydispersity index (PDI = 0.246) and the longest kinetic stability (S:CoS = 8:2, S/CoS:O = 9:1).

Application of pressure-driven membrane techniques for the recovery of water and fertilising components from pig slurry

Marszałek, Marta, Kowalski, Zygmunt, Makara, Agnieszka
Article
2016
Pig slurry is a by-product of non-bedding pig farming. It is a heterogeneous liquid mixture of faeces, urine, spilt feed and water used for waste removal. As it carries large amounts of organic and biogenic substances, slurry can pose a risk for the natural environment; therefore, it should be properly managed. This paper presents methods for the recovery of water and fertilising components from pig slurry using low-pressure (microfiltration, ultrafiltration) and high-pressure (nanofiltration, reverse osmosis) membrane techniques.

Qualitative analysis of the main polyphenols contained in apple pomace extract

Malinowska, Magdalena, Śliwa, Karolina, Sikora, Elżbieta, Ogonowski, Jan
Article
2016
The paper describes chosen methods for the extraction and qualitative analysis of the main polyphenolic compounds contained in apple pomace. Apple pomace is a by-product generated during apple juice production. The extracts were obtained with the Ultrasound Assisted Micelle Mediated Extraction (UAMME) method using a 1% Rocanol B2 water solution, as well as the Ultrasound Assisted Extraction (UAE) method in water. Thin Layer Chromatography (TLC) and UV/VIS spectroscopy were applied as analytical methods in order to identify the main polyphenolic substances in the obtained extracts. The obtained results showed that both UAMME as well as UAE are effective methods for obtaining quercetin, catechin and rutin.

Horizontal ground heat exchangers – analytical solutions and numerical simulations

Larwa, Barbara, Teper, Mikołaj, Kupiec, Krzysztof
Article
2016
This paper concerns the basics of modelling ground heat exchangers. Several specific cases were described, for which computational dependencies and calculation results were presented. Models based on analytical solutions were considered as well as models that use computer applications based on numerical calculations.

Correlation of hexabromocyclododecane and content of fat in fish

Kuc, Joanna, Grochowalski, Adam, Świergosz, Tomasz
Article
2016
A study on the correlation between the concentration of hexabromocyclododecane and the percentage of fat in meat tissues of selected marine fish species, both marine and farmed, has been carried out. The relationships between variables based on a determination of the coefficients of linear correlation r-Pearson were determined and graphs illustrating these dependencies were presented.

Laboratory tests of photovoltaic modules formed of multicrystalline silicon cells

Komorowicz, Tadeusz, Neupauer, Krzysztof, Sabat, Katarzyna, Głuszek, Aneta
Article
2016
The paper presents the results of laboratory tests of both a photovoltaic module formed of 36 multicrystalline silicon cells and a four-module generator, in the form of voltage-current characteristic curves. An analysis of the obtained data is conducted as well.

Modelling of heat conduction in the ground

Gwadera, Monika, Larwa, Barbara, Kupiec, Krzysztof
Article
2016
Simple cases of heat conduction in the ground are presented. Systems without interaction with the ground surface are considered. For heating or cooling of the ground by a flat slab, an analytical solution was used. Heat transfer between the ground and a single pipe and several parallel pipes is also considered. In these cases, a numerical solution was used. The :analysed problems are of practical importance for modelling and simulation of ground heat exchangers cooperating with heat pumps.