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    Wyświetlanie 1-9 z 9
    Tytuł:
    Analiza warstw z hydroksyapatytu i hydroksyapatytu domieszkowanego magnezem osadzanych techniką ablacji laserowej przy użyciu lasera ekscymerowego ArF
    Characterization of hydroxyapatite and Mg-doped hydroxyapatite coatings deposited by pulsed laser ablation technique using ArF excimer laser
    Autorzy:
    Mróz, W.
    Jedyński, M.
    Paszkiewicz, Z.
    Prokopiuk, A.
    Ślósarczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/285292.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    osadzanie impulsem laserowym
    hydroksyapatyt
    pulsed laser deposition
    hydroxyapatite
    XRD
    Opis:
    Warstwy z hydroksyapatytu osadzane były na podłożu ze stopu Ti6Al4V z warstwą buforową TiN metodą laserowej ablacji. Dwie tabletki składające się ze sprasowanego hydroksyapatytu [wzór] i domieszkowanego magnezem hydroksyapatytu [wzór] zostały poddane ablacji laserem ekscymerowym ArF (lambda=193 nm). Użycie materiałów o różnym składzie umożliwiło ustalenie wpływu składu chemicznego tarczy na strukturę osadzanej warstwy. Uzyskane warstwy były analizowane za pomocą metody dyfraktometrii rentgenowskiej (XRD). Wyniki analizy XRD pokazują, że osadzona warstwa z hydroksyapatytu domieszkowanego magnezem posiada strukturę polikrystaliczną w przeciwieństwie do struktury warstwy osadzonej z czystego hydroksyapatytu, która była amorficzna.
    Hydroxyapatite layers were deposited on Ti6Al4V substrates with TiN buffer layers by use of pulsed laser deposition method. With this technique two pressed pellets consisted of hydroxyapatite [formula] and hydroxyapatite doped with magnesium [formula] were ablated using ArF excimer laser (lambda=193 nm). The use of different targets enabled to determine the influence of target composition on the nature of deposited layers. The obtained deposits were characterized by means of X-ray diffraction method (XRD). The analysis from XRD showed that Mg-doped HA layer had crystalline structure and composition of layer deposited from pure HA material is characterized by amorphous nature.
    Źródło:
    Engineering of Biomaterials; 2007, 10, no. 69-72; 15-17
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanisms for self-assembling topography formation in low-temperature vacuum deposition of inorganic coatings on polymer surfaces
    Autorzy:
    Lackner, J.
    Waldhauser, W.
    Alamanou, A.
    Teichert, C.
    Schmied, F.
    Major, L.
    Major, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/200047.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    topography
    roughness
    coatings
    pulsed laser deposition
    magnetron sputtering
    polymers
    Opis:
    Functionalization of surfaces is an important task for nanotechnology to add specially designed physico-chemical properties to materials. Besides chemical modification of surfaces, physical adaptations gain increasing interest. Thus, understanding the influences of film deposition on surface topography formation is the basis for future developments. For physical or chemical vapour deposited (PVD, CVD) films, structure zone models were developed, clearly showing the influences of temperature and vapour energy and, thus, surface and bulk diffusion on film structures based on four different structure zones. Generally, similar zones are also found in PVD coatings on polymeric substrates; However, due to restrictions in coating temperatures due to the thermal resistance of most polymers, the coating temperature is restricted to mostly 50°C, excluding thermal activation of at least surface diffusion of inorganic materials (metals and their nitrides, oxides, carbides, etc.) and resulting in columnar growth with dome-shaped column tops. Additionally, the high difference in mechanical properties between “stiff” inorganic coatings and “flexible” polymers implicates stress-induced growth phenomena, resulting in wrinkling, cracking and finally the formation of a superseding structure, depending on substrate and film materials and the vapour energy of the deposition method.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 2; 281-294
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish Artificial Heart - new coatings, technology, diagnostics
    Autorzy:
    Sarna, J.
    Kustosz, R.
    Major, R.
    Lackner, J.
    Major, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/200025.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pulsed laser deposition
    microstructure
    cell adhesion
    Opis:
    Since 1991, the Foundation for Cardiac Surgery Development in Zabrze has been implementing research on the artificial heart. In 1995, an artificial ventricle, POLVAD, was implanted to a patient, and in 1998, the prototype of a clinical controller, POLPDU-401, was created. A further development of the studies on an implantable artificial heart requires an integrated approach and an application of advanced methods of materials sciences in order to develop new materials suitable for the contact with blood, as well as to apply a multilateral biomedical diagnostics in hydrodynamic conditions. The estimation of the cell–material interaction plays an important role in the biomaterial design. An analysis of the influence of the carbon content in titanium nitride on the biological and biophysical properties of biomaterial coatings was studied. The cell-material reactions were considered in dynamic and static conditions. Three groups of materials were under examinations – titanium nitride (TiN), as well as titanium carbonitride with a low and high carbon content – of which the best properties were observed for TiN. We found a strong influence of the stoichiometry of TiN (atomic ratio of Ti/N) on the biocompatibility. A non-stoichiometric TiN could have a negative influence on the surrounding tissue.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 2; 329-335
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and mechanical properties of boron nitride thin films deposited on steel substrates by pulsed laser deposition
    Autorzy:
    Gocman, K.
    Kałdoński, T.
    Mróz, W.
    Burdyńska, S.
    Prokopiuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/244608.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    boron nitride
    pulsed laser deposition
    nanohardness
    elastic modulus
    critical load
    Opis:
    The article presents preliminary results of investigation on structure, morphology and mechanical properties of boron nitride thin films prepared by pulsed laser deposition on various steel substrates. In order to improve adhesion and reduce internal stresses, substrates were subjected to gas nitriding. To increase gas ionization in the chamber and provide the deposited particles with higher energy RF discharge generator was used. Structure and morphology of coatings were examined by atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). Mechanical properties like nanohardness (sclerometric) and elastic modulus (using approach curves) were characterized by UNMT. Adhesion of coatings was measured by scratch tests; critical load was determined on the basis of microscopic observation and friction force and acoustic emission runs. On the basis of obtained results, possibility of using steel as substrate for BN thin films deposition was confirmed. Stable, crystalline, multiphase coatings with good adhesion to the steel substrate were obtained. It was also proved that mechanical properties of prepared coatings and their adhesion to the substrates strongly depend on the type of the substrate. In the next stage tribological properties of BN, coatings will be examined in particular in terms of wear resistance and friction coefficient between coatings and steel.
    Źródło:
    Journal of KONES; 2011, 18, 1; 149-156
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antimicrobial Characteristics of Pulsed Laser Deposited Metal Oxides on Polypropylene Hydroentangled Nonwovens for Medical Textiles
    Właściwości przeciwdrobnoustrojowe włóknin polipropylenowych pokrytych tlenkami metali stosowanych w wyrobach medycznych
    Autorzy:
    Ramamurthy, P.
    Chellamani, K. P.
    Dhurai, B.
    ThankaRajan, S. P.
    Subramanian, B.
    Santhini, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/949467.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    antibacterial activity
    metal oxides
    pulsed laser deposition
    energy dispersive X-ray
    EDX
    polypropylene
    hydroentangled nonwoven
    działanie antybakteryjne
    tlenki metali
    polipropylen
    włóknina
    wyroby medyczne
    Opis:
    In this study, an attempt was made to investigate the antimicrobial activity on polypropylene (PP) hydroentangled nonwoven fabrics coated with transition metal oxides. After etching the nonwoven fabrics with RF plasma, nano-scale coatings of ZnO and CuO were done using the KrF excimer based pulsed laser deposition technique (PLD). Morphological and antimicrobial studies were carried out to elucidate the mechanism of antibiocidal behaviour of the coated fabrics. Results showed significant antibacterial activity of ZnO and CuO coated PP hydroentangled nonwovens with a better activity against gram positive S.aureus than gram negative E.coli. Inherently non-toxic, PP has excellent chemical resistance and the use of specialised PP fibres for hydroentangled nonwovens could offer scope in addition to metal oxide coatings; nano-scale biological materials such as enzymes and drugs could add specific functionality for their use as medical textiles.
    W pracy podjęto próbę zbadania aktywności przeciwdrobnoustrojowej polipropylenowych włóknin pokrytych tlenkami metali. Przeprowadzono badania morfologiczne i przeciw- drobnoustrojowe powlekanych włóknin. Wyniki wykazały znaczną aktywność antybakteryjną włóknin pokrytych ZnO i CuO, przy czym wyższą aktywność antybakteryjną zaobserwowano wobec bakterii Gram-dodatnich (Staphylococcus ureus), niż wobec Gram-ujemnych (Escherichia coli). Stwierdzono, że zastosowanie nietoksycznego polipropylenu, który charakteryzuje się bardzo dobrą odpornością chemiczną, do wytwarzania włóknin powlekanych tlenkami metali pozwala na otrzymanie funkcjonalnych produktów medycznych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2017, 2 (122); 112-119
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and Structure of the Erbium Stabilized Bismuth Oxide Thin Films Deposited by PLD Technique
    Autorzy:
    Kąc, S.
    Szwachta, G.
    Cieniek, Ł.
    Moskalewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/356362.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Pulsed Laser Deposition
    thin films
    bismuth oxide
    surface topography
    Opis:
    The aim of the work was to obtain thin bismuth oxide films containing, at room temperature, the Bi1,5Er0,5O3 phase. This phase corresponds to the structure of the high-temperature δ-Bi2O3 phase, in pure bismuth oxide, characterized by the highest ionic conductivity of all known solid state ionic conductors. The high-temperature δ-Bi2O3 phase with the face centered cubic structure, in pure bismuth oxide, occurs only at temperature above 730°C. Stabilization of the δ-Bi2O3 phase at room temperature was achieved by an addition of the erbium together with the employ-ment of the Pulsed Laser Deposition (PLD) technique. The influence of an amount of Er alloying and the film thickness on surface morphology, microstructure, phase composition of thin films were investigated. The velocity of deposition of thin layers of bismuth stabilized with erbium in the PLD process using the Nd: YAG laser was about 0.5 nm/s.The investigation results of erbium doped bismuth oxide thin films deposited onto (0001) oriented Al2O3 monocrystalline substrate are presented. Thin films of uniform thickness, without cracks, and porosity were obtained. All deposited thin films (regardless of the film thickness or erbia (Er2O3) content) exhibited a columnar structure. In films stabilized with erbium, up to approx. 250 nm thickness, the columns have a diameter at the base from 25 to 75 nm. The columns densely and tightly fill the entire volume of the films. With increasing of the film thickness increases, porosity also significantly increases. In thin layers containing from 20 to 30 mole % Er2O3 the main identified phase at room temperature is Bi1,5Er0,5O3. It is similar to the defective fluorite-type structure, and belongs to the Fm-3m space group. This phase corresponds to the structure of the high-temperature δ-Bi2O3 phase in pure bismuth oxide.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 969-974
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Investigation of the Influence of Pulsed Laser Deposited Tin Thin Film Morphology on Deformation Inhomogeneities
    Autorzy:
    Perzyński, K.
    Zych, D.
    Sitko, M.
    Madej, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/353619.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thin films
    pulsed laser deposition
    digital material representation
    homogenization
    finite element method
    Opis:
    In vestigation of influence of TiN thin film morphology on deformation inhomogeneities is an overall subject of the research. Numerical modelling approach that was selected for the study is based on the digital material representation concept, which gives an opportunity to directly replicate columnar microstructure morphology of an investigated thin film. Particular attention in this paper is put on the discussion of the influence of cellular automata neighbourhood on thin-film digital morphologies and their further deformation behaviour. Additionally, an evaluation of representativeness aspects of the digital models, in particular, the analysis of the influence of a number of columns, their dimensions and variations in their properties on the material behaviour during compression tests is also presented. The non-periodic boundary conditions are assumed during the investigation. Obtained data in the form of equivalent stress distributions as well as homogenized stress-strain curves from analyzed case studies are presented and discussed within the paper.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 713-720
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the approach to the analysis of the growth of epitaxial layers by pulsed laser deposition
    Autorzy:
    Pankratov, Evgeny L.
    Powiązania:
    https://bibliotekanauki.pl/articles/29520091.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    pulsed laser deposition
    mass transport
    heat transport
    analytical modelling
    Opis:
    This paper considers an analytical approach for the prognosis of mass and heat transport during the growth of epitaxial layers by means of pulsed laser deposition. The approach provides the opportunity to make a prognosis which takes into account the spatial and temporal variations of their parameters and, at the same time, the nonlinearity of these processes. Based on this approach, the influence of the variation of several parameters on the growth process is investigated.
    Źródło:
    Computer Methods in Materials Science; 2021, 21, 4; 203-208
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pulsed laser deposition of ZnO and MoO3 as reflection prohibitors on photovoltaic cell substrate to enhance the efficiency
    Autorzy:
    Selvan, P.
    Jebaraj, D. J. J.
    Hynes, N. R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201045.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    solar cell
    antireflection coating
    refractive index
    pulsed laser deposition
    ogniwo słoneczne
    powłoka antyrefleksyjna
    współczynnik załamania światła
    pulsacyjna ablacja laserowa
    Opis:
    Purpose With the ever-growing demand for conventional fuels, the improvement in the efficiency of the photovoltaic system is the need of the hour. Antireflection coatings enhance the availability of solar power by reducing the percentage of light reflected. A new coating has been developed to improve the solar cell's overall efficiency. This study focuses on enhancing the efficiency of the monocrystalline solar cell when a coating of ZnO-MoO3 is applied at a certain thickness. Design/methodology/approach A layer of ZnO followed by MoO3 is deposited on a Silicon solar cell substrate using a Pulsed Laser Deposition process. Due to the transmissivity d between the two materials, they act as excellent antireflection coating. The layer thickness has been engineered to lie in the maximum absorption spectrum of monocrystalline silicon solar cells, which is between 400 and 800 nanometers. Findings Based on the calculation of transmissivities for a given layer thickness of coating material, the coating has been done, and the efficiencies of the coated specimen were compared with the uncoated solar cell. The percentage improvement in the electrical efficiency of a single crystalline silicon solar cell with an anti-reflection coating at 1059 W/m2 is about 35.7%. Research limitations/implications Among the available antireflection coating materials, the combination that provides better efficiency when coated on top of a solar cell is hard to find. Practical implications This anti-reflection coating could be a better solution to enhance the overall efficiency of the single crystalline silicon solar cell. Originality/value Although ZnO and MoO3 coatings have been investigated separately for improvement in solar cell efficiency with varying levels of success, the hybrid coating of ZnO/MoO3 with a performance enhancement of 35.7% is a great leap.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 113, 2; 65--71
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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