Wyniki wyszukiwania - BazTech

1

Właściwości transportowe membran chitozanowych w procesie perwaporacji i przenikania par dla układu woda-etanol

Dudek G., Turczyn R., Gnus M., Tórz A., Strzelewicz A., Krasowska M., Konieczny K., Kalinowski R.

Przemysł Chemiczny

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2016

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T. 95, nr 3

402--405

PL

Przedstawiono wyniki badań rozdzielania mieszaniny woda-etanol metodami przenikania par i perwaporacji z zastosowaniem membran chitozanowych usieciowanych aldehydem glutarowym i zawierających dodatek tlenku żelaza (magnetytu). Stwierdzono, że obecność magnetytu w matrycy polimerowej powoduje wzrost współczynnika dyfuzji i spadek współczynnika rozpuszczalności wody, prowadząc do efektywniejszego rozdziału badanej mieszaniny. Porównano również zaobserwowane różnice we właściwościach transportu membran w procesach przenikania par i perwaporacji.

EN

Fe3O4-contg. (up to 15% by mass) chitosan membranes were crosslinked with glutaraldehyde and tested for H2O permeability and pervaporation. The water permeability coeffs. increased more than twice in pervaporation and 1.17 times in vapor permeation with the increase of Fe3O4 content. Similarly, the permeability coeffs. of ethanol through the membrane decreased 1.6 times and 1.9 times, resp. The significantly higher permeate streams were obtained during the pervaporation than during the permeation.

2

Poly(3,4- ethylenedioxypyrrole) – novel conducting polymer with biomedical applications

Krukiewicz K., Gniazdowska B., Turczyn R., Jarosz T., Herman A. P., Boncel S., Zak J. K.

Engineering of Biomaterials

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2016

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Vol. 19, no. 138 spec. iss.

79

3

Cytotoxic surfaces for regional chemotherapy

Krukiewicz K., Cichy M., Turczyn R., Jarosz T., Zak J. K., Bednarczyk-Cwynar B., Ruszkowski P.

Engineering of Biomaterials

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2016

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Vol. 19, no. 138 spec. iss.

78

4

Ocena sieciowania resztkowego wywołanego efektem samorozgrzania we włóknistych kompozytach epoksydowych z wykorzystaniem spektroskopii Ramana

Katunin A., Krukiewicz K., Turczyn R.

Chemik

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2014

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Vol. 68, nr 11

957--966

PL

Mechaniczne obciążenia cykliczne struktur polimerowych wywołuje procesy dyssypacji energii mechanicznej, które prowadzą do powstania efektu samorozgrzania, tj. lokalnego wzrostu temperatury, odpowiadającemu gradientowi naprężeń. W szczególnych przypadkach obciążania zmęczeniowego, efekt samorozgrzania staje się procesem dominującym i nasila degradację strukturalną. Wcześniejsze badania w tym zakresie wykazują, że efekt samorozgrzania związany jest z sieciowaniem resztkowym grup epoksydowych (EP) w kompozytach włóknistych. Celem prezentowanych badań jest ocena stopnia sieciowania resztkowego oparta na analizie widm Ramana, profili temperaturowych oraz charakterystycznych temperatur w kompozytach poddawanych obciążeniom zmęczeniowym z występowaniem efektu samorozgrzania. Analizie poddano charakterystyczne pasma w widmach Ramana, a także charakterystyczne krzywe temperaturowe i ich zależność od częstotliwości wymuszenia. Uzyskane wyniki pozwalają na charakterystykę mechanizmów degradacji włóknistych kompozytów epoksydowych poddawanych zmęczeniu cieplnemu.

EN

Mechanical cyclic loading of polymeric structures causes dissipation processes, which introduce the self-heating effect, i.e. the local temperature increase equivalent to the stress gradient. In some specific cases of fatigue loading the self-heating effect dominates the process and intensifies the structural degradation. Previous studies in this area show that the heating-up is connected with residual cross-linking of epoxy groups (EP) in the fibrous composites. The purpose of the presented study is an evaluation of degree of residual cross-linking and an analysis of Raman spectra with temperature profiles and characteristic temperatures of EP-based fibrous composites subjected to the fatigue loading with occurrence of the self-heating effect. The characteristic bands in Raman spectra as well as characteristic temperature history curves and their dependence on the excitation frequency were investigated. Obtained results allow for the characterization of degradation mechanisms of EPbased fibrous composites under thermal fatigue.

5

Experimental and numerical studies of MR damper with prototype magnetorheological fluid

Kciuk S., Turczyn R., Kciuk M.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 39, nr 1

52-59

EN

Purpose: Results of experimental studies of a prototype magnetorheological damper at various magnitudes of control current as well as the manner of modelling electromagnetic phenomena occurring in the damper are presented in this paper. Design/methodology/approach: Model MR fluid was prepared using silicone oil OKS 1050 mixed with carbonyl iron powder CI. Furthermore, to reduce sedimentation, as stabilizers was added Aerosil 200. The observations of the surface morphology of carbonyl iron and fumed silica were carried out using Digital Scanning Electron Microscope SUPRATM25 ZEISS. The effect of magnetic field on magnetorheological fluid is modelled by the finite element method. Findings: The presented model meets the initial criteria, which gives ground to the assumption about its usability for determining the dynamics properties of mechanical systems, employing the finite element method using ANSYS software. Research limitations/implications: The elaborated model can be use for modelling the semi active car suspension dynamics. Originality/value: The actual-non-linear characteristics of magnetisation identified experimentally were used as the values of relative magnetic permeability of the piston housing material. The possibility of application, e.g. real characteristics of material magnetisation and faster and faster calculation machines make possibility the creation of more precise models and more adequate ones to reality.

6

Experimental and numerical studies of MR damper with prototype magnetorheological fluid

Kciuk S., Turczyn R., Kciuk M.

Archives of Computational Materials Science and Surface Engineering

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2010

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Vol. 2, nr 3

117-124

EN

Purpose: Results of experimental studies of a prototype magnetorheological damper at various magnitudes of control current as well as the manner of modelling electromagnetic phenomena occurring in the damper are presented in this paper. Design/methodology/approach: Model MR fluid was prepared using silicone oil OKS 1050 mixed with carbonyl iron powder CI. Furthermore, to reduce sedimentation, as stabilizers was added Aerosil 200. The observations of the surface morphology of carbonyl iron and fumed silica were carried out using Digital Scanning Electron Microscope SUPRATM25 ZEISS. The effect of magnetic field on magnetorheological fluid is modelled by the finite element method. Findings: The presented model meets the initial criteria, which gives ground to the assumption about its usability for determining the dynamics properties of mechanical systems, employing the finite element method using ANSYS software. Research limitations/implications: The elaborated model can be use for modelling the semi active car suspension dynamics. Originality/value: The actual-non-linear characteristics of magnetisation identified experimentally were used as the values of relative magnetic permeability of the piston housing material. The possibility of application, e.g. real characteristics of material magnetisation and faster and faster calculation machines make possibility the creation of more precise models and more adequate ones to reality.

7

Magnetorheological characterisation of carbonyl iron based suspension

Kciuk M., Kciuk S., Turczyn R.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 33, nr 2

135-141

EN

Purpose: The main aim of this article was to present the investigation results of magnetorheological fluids (MR) composed of carbonyl iron (CI) particles and analyse their flow behaviour in terms of the internal structure formation by a control of applied external magnetic field. The morphology, magnetic properties, sedimentation stability, and magnetorheological properties of the examined MR fluids were studied. Design/methodology/approach: Model MR fluid was prepared using silicone oil OKS 1050 mixed with carbonyl iron powder CI. Furthermore, to reduce sedimentation Aerosil 200 was added as stabilizers. In the purpose to determine the properties of the analyzed fluids the sedimentation and dynamic viscosity were investigated. Findings: Dynamic viscosity of investigated magnetorheological fluids rapidly and reversibly change in response to the applied external magnetic field. Moreover added particles of fumed silica inhibited sedimentation of carbonyl iron particles. Research limitations/implications: MR fluids with excellent properties can be applied in various fields of civil engineering, safety engineering, transportation and life science. They offer an outstanding capability of active control of mechanical properties. But there are no systematic published studies of factors affecting the durability of MR fluids and devices. There is very little information on the effects of exposing different MR fluids to temperature, for this reasons further efforts are needed in order to obtain even better results. Originality/value: The investigation results are reliable and could be very useful both for designers and the practitioners of many branches of industry.

8

Preparation and study of model magnetorheological fluids

Turczyn R., Kciuk M.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 27, nr 2

131-134

EN

The aim of this work was preparation of the model magnetorheological (MR) fluids. Basic properties of prepared MR fluids, as their response to an external magnetic field and their stability, were investigated. Moreover (furthermore) few results concerning stabilizing effect of various additives are presented. Design/methodology/approach: Model MR fluid was prepared using three type of carriers: silicone oil OKS 1050, synthetic oil OKS 352, mineral oil OKS 600 mixed with carbonyl iron powder CI HQ. Furthermore, to reduce sedimentation Aerosil 200 and 972, Arsil 1100 and Arabic gum were added as stabilizers. MR effect was measured using device working as Couette's viscosimeter equipped with coil generating magnetic field. Sedimentation was measured by simply observation of changes in boundary position between clear and turbid part of MR fluid placed into glass tube. Findings: Influence of the additives presence on the MR effect was determined. The presence of additives did not diminish the magnetic effect but even increased the dynamic viscosity in existence of an external magnetic field. The stability of MR fluid was improved by adding additives to the formulation. Moreover, increasing stabilizer concentration further enhanced the MR fluid stability. The best result was achieved in case of Aerosil 9782 at 2% content. Research limitations/implications: MR fluids with excellent properties can be applied in various fields of civil and safety engineering, transportation and life science. However, due to sedimentation, MR fluid response to magnetic field is restricted and in an extreme situation could lead to the fail that is why further efforts must be still made in order to obtain even better results. Originality/value: This article provides set of new data about improvement of MR fluid stability in the presence of selected stabilizers and contains few remarks how the formulation of MR fluid affect its properties.

9

Properties and application of magnetorheological fluids

Kciuk M., Turczyn R.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 18, nr 1-2

127--130

EN

Purpose: This paper presents basic properties of the magnetorheological fluids (MR) and their development in recent years. A variety of still growing practical applications in mechanical devices are presented. Design/methodology/approach: The theoretical research results of the properties and applications obtained in the past decades and progressed in recent years are reviewed. Findings: It is very clearly and well understood from the presented paper that replacement of the traditional devices with active, smart system better adapted to the environment stimulus are necessary. Many of them will include MR fluids as active component. Research limitations/implications: MR fluids with excellent properties can be applied in various fields of civil engineering, safety engineering, transportation and life science. They offer an outstanding capability of active control of mechanical properties. Practical implications: A very useful material for the engineers engaged in the design of brakes, dampers, clutches and shock absorbers systems. Originality/value: This article describes an up-to-date MR materials development and their application in civil engineering. The advantage of the smart systems over nowadays solutions becomes the direction of the researches and designing of 21st century devices.

10

Zastosowanie pochodnych celulozy w medycynie ze szczególnym uwzględnieniem usieciowanej hydroksyetylocelulozy

Wierucka-Młynarczyk B., Turczyn R., Sabat D., Dugiełło J., Ilewicz L.

Zeszyty Naukowe. Chemia / Politechnika Śląska

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2001

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z. 146

215-218

EN

In this study we describe all possibility of application of cellulose and derivants of cellulose with particular regard to silated hydroxyethylcellulose. We predict the possibility of using this polymer as a carrier, for such materials as hydroxyapatite, tricalcium phosphate or calcium hydroxide, in conservative dentistry, endodontics, periodontology etc.

11

Badania termoczułych układów polimerowych

Turczyn R., Dutkiewicz A., Łapkowski M.

Zeszyty Naukowe. Chemia / Politechnika Śląska

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2001

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z. 146

315-318

EN

Thermal behaviour of aqueous solutions of Pluronic 127F and synthesised copolymers of crylic acid (AAc(PEO)x-(PPO)y-(PEO)z-H) with NiPAm, DMAAm and ApPO was descirbed. LCST and HCST for these systems was determined.

12

Badania przedkliniczne usieciowanej hydroksyetylocelulozy - materiału implantacyjnego w stomatologii

Wierucka-Młynarczyk B., Ilewicz L., Książek-Bąk H., Bulek-Juranek G., Łapkowski M., Sabat D., Turczyn R.

Zeszyty Naukowe. Chemia / Politechnika Śląska

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1999

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z. 140

323-326

PL

Przedstawiono wyniki dwóch testów przedklinicznych. Test hemolityczny wykazał brak toksyczności usieciowanej hydroksyetylocelulozy. Test alergiczny na skórze świnek morskich wykazał całkowitą neutralność tego polimeru w stosunku do ich organizmu, co potwierdzono badaniami histopatologicznymi.

EN

The aim of this study was to present results of two preclinical examinations: haemolytic test and allergic test. The haemolytic test showed lack of hydroxyethylcellulose toxicity. Allergic test performed on the skin of guinea pigs revealed that polymer was completely neutral to their organism which was also confirmed in histopathological examination.