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    Wyświetlanie 1-7 z 7
    Tytuł:
    Application of selected diffractive and microscopic methods to evaluate the physical state of drug and morphology of microspheres obtained by spray drying of furosemide with Eudragit L30 D-55.
    Autorzy:
    Ostróżka-Cieślik, Aneta
    Sarecka-Hujar, Beata
    Krzykawski, Tomasz
    Karcz, Jagna
    Banyś, Anna
    Jankowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/895685.pdf
    Data publikacji:
    2018-06-30
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    X-ray diffraction
    scanning electron microscopy
    Microsphere
    furosemide
    laser diffraction
    Eudragit L30 D-55
    Opis:
    In pharmaceutical technology, the analysis of physicochemical properties of raw materials, intermediates and products is part of quality control testing at each stage of designing formulations and in the routine evaluation of the final product. The aim of the study was to analyse the physical state of drug and the morphology of microspheres obtained by spray drying, where furosemide was incorporated in the polymeric matrix of Eudragit L30 D-55. The following optimal parameters of the spray drying process were established: aspirator capacity of 80%, T.in: 140 ° C, pump capacity: 10%. The laser diffraction method was used to analyse the size distribution of microspheres in the following furosemide-Eudragit L30 D-55 systems: 1:1, 1:3, 1:5. X-ray powder diffraction was applied to compare the degrees of crystallinity of the final product and the starting material. Furosemide has crystal structure both before and after spray drying, it occurs in the polymorphic forms (form I crystals). No reflection from the crystalline phase has been found on the diffraction pattern of Eudragit. This is an amorphous substance.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 3
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cooling Characteristic and Microstructure of Ni-Si-B-Ag Alloy
    Autorzy:
    Wojciechowska, M.
    Ziewiec, K.
    Mucha, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/356071.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    amorphous/crystalline composite
    scanning electron microscopy
    X-ray diffraction
    thermography
    melt spinning
    Opis:
    The aim of this work was to investigate the possibility of obtaining an amorphous/crystalline composite starting from Ni-SiB-based powder grade 1559-40 and silver powder. The alloy was produced using arc melting of 95% wt. Ni-Si-B-based powder (1559-40) and 5% wt. Ag powder. Ingot was re-melted on a copper plate and observed while cooling using a mid-wave infra-red camera. The alloy was then melt-spun in a helium atmosphere. The microstructure of the ingot as well as the melt-spun ribbon was studied using light microscopy and scanning electron microscopy with energy dispersive spectrometry. Phase identification was performed by means of X-ray diffraction. The observations confirmed an amorphous/crystalline microstructure of the ribbon where the predominant constituent of the microstructure was an amorphous phase enriched with Ni, Si, and B, while the minor constituent was an Ag-rich crystalline phase distributed in a film along the melt-spinning direction.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1357-1360
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Materiały dla jednowarstwowych ogniw paliwowych
    Materials for single layer fuel cells
    Autorzy:
    Winiarz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/134696.pdf
    Data publikacji:
    2016
    Wydawca:
    ADVSEO
    Tematy:
    fuel cell
    composite material
    proton conductor
    lanthanum niobate
    scanning electron microscopy
    x-ray diffraction
    Opis:
    A composite material, which may be further applied as a single layer fuel cell, was synthesized using solid state synthesis method. Composite consisted of two components. The first was a nanoceramic proton conductor – calcium doped lanthanum niobate. The second one was a nanoceramic semiconductor oxide composed of lithium, nickel and zinc oxides respectively. Structural and electrical investigations were performed on the received material. Scanning electron microscope images showed that the microstructure on the surface of this material is homogeneous. Energy dispersive X-Ray diffraction confirms that the components of the investigated composite are mixed together in a volume of material allowing to current flow through the percolation threshold. Open circuit voltage was changing during measurement from 0.8V to 0.6V. Moreover, the material did not change its structural properties during the current flow, hence it could be a good candidate to the production of single layer fuel cells.
    Źródło:
    Technical Issues; 2016, 4; 104-109
    2392-3954
    Pojawia się w:
    Technical Issues
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Transition in SrZnO Laser Pulse Deposited Alloy
    Autorzy:
    Albrithen, H. A.
    Elnaggar, M.
    Ozga, K.
    Szota, M.
    Alahmed, Z. A.
    Alanazi, A. Q.
    Alshahrani, H.
    Alfaifi, E.
    Djouadi, M. A.
    Labis, J. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/355190.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    oxide materials
    solid state alloys
    structural phase transition
    X-ray diffraction
    scanning electron microscopy
    Opis:
    We have discovered a structural transition for the SrZnO alloy films from a wurtzite to a rock-salt structure, leading to a reduction in the (112̲0)/(0001) surface energy ratio. The films were grown by pulsed laser deposition using different SrO ratios, x. We have revealed that growth at a higher temperature, 750°C, resulted in a sharp 0002 peak at a low SrO content (5%), whereas growth at a higher SrO content (10%) resulted in a non-crystalline film with minute crystallites with a (112̲0) orientation. Generally the crystallinity decreased as the SrO content increased. No results obtained for the crystalline films showed any orientation of significant peaks besides the peak attributed to the (0001) plane, suggesting epitaxial growth. Optical measurements showed difference in transmission widows of alloys with different SrO percentage, and this was correlated to SrO influence on growth mode as indicated by scanning electron imaging. The studied SrZnO films, with SrO/(SrO + ZnO) ≤ 0.25, were grown by pulsed laser deposition using different SrO ratios, x. The effects of temperature and oxygen pressure during growth on the films’ structural properties were investigated. XRD results indicate that the film crystallinity was improved as the temperature and O2 pressure increased up to 650°C and 0.5 Torr, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 211-216
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterisation of Mg-Zn-Ca-Y powders manufactured by mechanical milling
    Autorzy:
    Lesz, S.
    Tański, T.
    Hrapkowicz, B.
    Karolus, M.
    Popis, J.
    Wiechniak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818808.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    Mg-based alloys
    scanning electron microscopy
    X-ray diffraction analysis
    mechanical alloying
    stopy magnezu
    skaningowa mikroskopia elektronowa
    rentgenowska analiza dyfrakcyjna
    mechaniczna synteza
    Opis:
    Purpose: This paper explains mechanical synthesis which uses powders or material chunks in order to obtain phases and alloys. It is based on an example of magnesium powders with various additives, such as zinc, calcium and yttrium. Design/methodology/approach: The following experimental techniques were used: X-ray diffraction (XRD) method, scanning electron microscopy (SEM), determining particle size distributions with laser measuring, Vickers microhardness. Findings: The particle-size of a powder and microhardness value depend on the milling time. Research limitations/implications: Magnesium gained its largest application area by creating alloys in combination with other elements. Magnesium alloys used in various industry contain various elements e.g. rare-earth elements (REE). Magnesium alloys are generally made by casting processes. Consequently, the search for new methods of obtaining materials such as mechanical alloying (MA) offers new opportunities. The MA allows for the production of materials with completely new physico-chemical properties. Originality/value: Thanks to powder engineering it is possible to manufacture materials with specific chemical composition. These materials are characterized by very high purity, specified porosity, fine-grain structure, complicated designs. These are impossible to obtain with traditional methods. Moreover it is possible to refine the process even further minimalizing the need for finishing or machining, making the material losses very small or negligible. Furthermore material manufactured in such a way can be thermally or chemically processed without any problems.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2020, 103, 2; 49--59
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmentally hazard and toxic exoskeletons of marine crustaceans wastes in synthesizing N-deacetylated chitin
    Zastosowanie niebezpiecznych i toksycznych dla środowiska egzoszkieletów skorupiaków morskich w syntezie N-deacetylowanej chityny
    Autorzy:
    El-Mekawy, Rasha E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2202580.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    chitosan
    shrimp shells
    scanning electron microscopy
    thermal gravimetric analysis
    X-ray
    diffraction
    chitozan
    skorupki krewetek
    skaningowa mikroskopia elektronowa
    analiza termograwimetryczna
    dyfrakcja rentgenowska
    Opis:
    High molecular weight chitosan was synthesized from shrimp shells. Chemical structure of chitosan was confirmed using FT-IR, XRD, TGA, and SEM analyses. Physicochemical properties of chitosan such as molecular weight (800 000 g/mol), deacetylation degree (80%), ash content (1%) indicating effectiveness of demineralization step in removing minerals, water binding capacity (4220%), and fat binding capacity (537%), were determined. FT-IR spectra exhibited characteristic joint band at 3365 cm-1 due to –OH and –NH2 regarding to the conversion of chitin acetyl group to NH2 of chitosan.
    Z muszli krewetek zsyntetyzowano chitozan o wysokiej masie cząsteczkowej. Strukturę chemiczną chitozanu potwierdzono metodami FT-IR, XRD, TGA i SEM. Określono właściwości fizykochemiczne chitozanu takie jak masa cząsteczkowa (800 000 g/mol), stopień deacetylacji (80%), wskazu jącą na skuteczność procesu demineralizacji zawartość popiołów (1%), zdolność wiązania wody (4220%) i zdolność wiązania tłuszczu (537%). Widma FT-IR wykazały charakterystyczne pasmo przy liczbie falowej 3365 cm-1, pochodzące od grup –OH i–NH2, wynikające z przekształcenia grupy acetylowej chityny w NH2 chitozanu.
    Źródło:
    Polimery; 2022, 67, 10; 503--508
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Fly Ash Concrete With Scanning Electron Microscopy and X-Ray Diffraction
    Autorzy:
    Uzbaş, Burhan
    Aydın, Abdulkadir Cüneyt
    Powiązania:
    https://bibliotekanauki.pl/articles/103299.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    fly ash
    microstructure of concrete
    scanning electron microscopy
    x-ray diffraction
    calcium hydroxide
    popiół lotny
    mikrostruktura betonu
    skaningowa mikroskopia elektronowa
    dyfrakcja rentgenowska
    wodorotlenek wapnia
    Opis:
    In this study, the effects of using different ratios of fly ash on hydration products as well as the mechanical and microstructural properties of hardened concrete were investigated. Portland cement was replaced with 5%, 10%, 15% and 20% fly ash (FA) by weight. The microstructural properties of the obtained samples were investigated by means of X-ray diffraction (XRD) and Scanning electron microscopy (SEM). Fly ash has negative effect on 7 days concrete strength; however, it was seen that fly ash increases the compressive strength of 28 and 90 days concrete. The XRD analysis showed that the ratio of calcium hydroxide (CH), which is produced by hydration, decreases depending on the concrete age and the amount of fly ash. The SEM analysis showed that the usage of fly ash decreases gaps and increases C-S-H which is also a hydration production. When Portland cement was replaced with 10% fly ash by weight, compressive strength has increased and microstructure of concrete has improved. The reason for this is filling of gaps by fly ash and the decrease in the amount of Ca(OH)2 due to the reaction between fly ash and Ca(OH)2. Within this scope, the development in microstructure of fly ash concrete was evaluated in 90 days duration and a change of the development with compressive strength was investigated.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 4; 100-110
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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