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

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

Type: Collection of magazine numbers
Release date

Collection items (10)


Biomechanical aspects of a atherosclerosis

Wasilewski, Jarosław, Mirota, Kryspin, Kiljański, Tomasz
Article
2013
Pathogenesis of atherosclerosis is a complex multifactorial process of vascular wall injury. It is widely accepted that the local hemodynamic factors, in particular, disturbed flow and low/ oscillatory shear stress leads to the plaque development. We present a consistent concept of atherosclerosis aetiology, taking into consideration the four main components contributing in the atheroma formation: geometric, hemodynamic, hemorheological, and mechanical risk factors. Exemplary illustrative flow simulation results for formulated concept have been presented. It assumes the pulsatile non-Newtonian fluid flow and uses realistic coronary artery geometry based on medical imaging and segmentation.

Rheological properties of primary pharmaceutical emulsions obtained by homogenization

Tal-Figiel, Barbara, Kulawik-Pióro, Agnieszka
Article
2013
The paper presents the results of rheological examinations of primary emulsions with the potential for pharmaceutical applications, created through emulsification using a homogeniser. The water phase of the examined emulsions was made up of water solutions of hydrocolloids, the fatty phase was the pharmaceutical oil Miglyol 812N and canola oil, sunflower seed oil, olive oil. For the determination of relations between the structural parameters of the emulsions and their viscous properties flow curves and viscosity curves were obtained for the examined systems. The obtained results were processed through regression of experimental points by rheological equations, using the own software of the rheometer.

Rheological investigations of pharmaceutical emulsions prepared with modified lecithin

Rosa, Magdalena, Kwiecień, Magdalena, Tal-Figiel, Barbara
Article
2013
In this paper the results of rheological investigations of pharmaceutical microemulsions prepared using modern lecithine derived emulsifiers has been prevented out. High stability of obtained systems and wide possibilities of controlling rheological parameters were found.

Correlation between rheological studies and organoleptic cosmetic emulsion with lanolin - natural emulsifier

Płocica, Joanna, Tal-Figiel, Barbara, Figiel, Wiesław
Article
2013
In this paper rheological investigations of cosmetic emulsions, prepared with lanoline as an emulsifier were carried out. The strong influence of emulsifier content and the applicability of rheological measurements to validate cosmetic products were shown.

Rheological analysis of Blast Furnace Synthetic Slag Admixtures of Al2O3

Migas, Piotr, Korolczuk-Hejnak, Marta, Karbowniczek, Mirosław, Łędzki, Andrzej
Article
2013
It is common for researchers to believe that liquid slag is a fluid characterized by rheological behavior of ideally viscous Newtonian body. At the same time it is assumed that the fluid is similar to synthetic polymers in terms of its structure. The authors of this paper conducted research into 4-component liquid and solid-liquid synthetic slag system: CaO–SiO2–MgO–Al2O3. The research involved graphite measurement systems. A perforated spindle was used for the solid-liquid systems subject to shear stress, whereas a smooth one was used for fully liquid systems. Both measurement systems worked according to Searle’s system. This paper presents selected rheological research results concerning oxide solutions in high temperatures and their rheological analysis.

Comparison of the rheological properties of polyamide-6 and its nanocomposites with montmorillonite obtained by melt intercalation

Majka, Tomasz M., Pielichowski, Krzysztof, Leszczyńska, Agnieszka
Article
2013
Each varying parameter which can contribute to the quality of final products plays an important role in the processing of polymer nanomaterials. Rheological properties are useful in proper formulation of new polyamide-6 (PA-6) based materials and selecting processing parameters. However, the measured rheological properties depend strongly on the sample preparation method, humidity regulation, and time-temperature history during the measurement and not least on the kind of rheometer being used. The results of the preliminary investigation show the changes in visco-elastic properties of two types of PA-6 and their nanocomposites with montmorilonite.

Methods of research into hair conditioners stability

Łuczak, Angelika, Fryźlewicz-Kozak, Beata
Article
2013
The aim of this work was to produce emulsion hair conditioners, and then to study their stability and rheological properties. For preparing emulsions two recipes with different oil phases and various emulsifiers were used. The emulsification process was performed using a homogenizer. Obtained samples were analyzed to determine their stability. Under the microscope the size of dispersed phase droplets was identified. The samples were also subjected to visual observation. At the same time rheological tests were carried out, which aimed at observing changes in rheological properties of emulsions.

Rheology of the wet surfactant foams and biofoams - a review

Krzan, Marcel
Article
2013
The rheology of foams is a difficult subject due to the complexity of their structure and the nature of their components. It’s influenced by multiple factors including: liquid bulk properties, gas properties, air phase volume, liquid volume fraction, solution viscosity, interfacial thin film visco-elasticity, bubble size distribution, and bubble shape. A nature of the adsorbed surfactants or biosurfactants and state of adsorption layer also modified the properties of the thin liquid film. The physical measurements of foam rheological properties are also complicated by its inherently unstable nature. Therefore, this review is focused on rheological studies and comparisons between various surfactant based foams and biofoams having wellcharacterized and different properties.

Procedure of preparation brittle gel sample for rheological measurements in plate-plate system

Cicha-Szot, Renata, Falkowicz, Sławomir
Article
2013
New way of preparation brittle gel samples for determining gel strength during oscillatory measurements in plate-plate system was presented in this paper. Presented procedure of sample preparation greatly decrease a cost of selection proper additive for improving gel strength and enable to obtain more reliable evaluation of gel’s mechanical properties. Moreover, by external preparation of corrosive samples (e.g. silicate gelling systems) gel’s aging time can be prolonged without the impact on sensor’s lifetime.