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    Wyświetlanie 1-14 z 14
    Tytuł:
    Analiza możliwości zastosowania materiałów nanokrystalicznych w energoelektronice
    Analysies of implemetation nanocrystalic materials in power electronics
    Autorzy:
    Biskup, Tomasz
    Kołodziej, Henryk
    Paluszczak, Dariusz
    Sontowski, Jacek
    Michalak, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2056443.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    kompozyty nanokrystaliczne
    dławiki WCz
    transformatory WCz
    energoelektronika
    przekształtniki tranzystorowe
    nanocomposite materials
    HF chokes
    HF transformers
    power electronics
    transistor converters
    Opis:
    W artykule przedstawiono analizę możliwości zastosowania nowoczesnych, nanokrystalicznych materiałów magnetycznych w przekształtnikach energoelektronicznych. Wyodrębniono dwa obszary zastosowań. Pierwszy z nich to elementy filtrów LCL pozwalających na kształtowanie prądu w układach prostowników aktywnych, z jednoczesną poprawą niekorzystnego wpływu takich przekształtników na sieć zasilającą. Drugi obszar to transformatory podwyższonej częstotliwości w układach przetwarzania energii, zwłaszcza ładowarkach akumulatorów dużej mocy. W obu tych przypadkach zastosowanie materiałów nanokrystalicznych mogłoby poprawić właściwości układów przez redukcję wymiarów, zmniejszenie strat czy hałasu. Zaproponowano także dwa stanowiska testowe pozwalające na weryfikację wyżej przedstawionej tezy.
    The paper presents an analyses of possible application the modern nanocomposite materials in the power electronics. The applications area was divided into the two subsystems. The first application is input LCL filters in active front end converters for energy recuperation. The second one is HF transformers for DC/DC converters, mainly in high power battery chargers. In the both application area the nanocomposite materials could improve its properties by mass and noise reduction or higher efficiency of energy conversion. In the end of the paper the two setups was proposed which can proof the thesis.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2021, 1, 125; 77--83
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic properties and surface domain structure of (Nd0.85Dy0.15)10Fe83Zr1B6 thin ribbons
    Autorzy:
    Ceglarek, A
    Plusa, D
    Dospial, M
    Nabialek, M
    Wieczorek, P
    Powiązania:
    https://bibliotekanauki.pl/articles/173512.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nanocomposite materials
    melt spinning method
    Re–Fe–B alloys
    hard magnetic magnets
    surface domain structure
    Opis:
    In this paper, the nanocrystalline (Nd0.85Dy0.15)10Fe83Zr1B6 ribbons produced by melt-spinning have been investigated by the X-ray diffraction method (XRD), vibrating sample magnetometer (VSM) and magnetic force microscopy (MFM). The XRD studies showed that material investigated was mainly composed of Re2Fe14B and α-Fe phases with fine grain sizes of 25 and 9 nm, respectively. The magnetic parameters determined from the hysteresis loop measurements are as follows: μ0HC = 0.96 T, μ0MR = 0.76 T, μ0MS = 1.09 T, (BH)max = 88 kJ/m3. The large remanence ratio (μ0MR/μ0MS) of 0.7 results from the exchange coupling between the soft and hard magnetic grains. The large surface interaction domains revealed by MFM confirmed the existence of strong exchange coupling between nanosize grains.
    Źródło:
    Optica Applicata; 2013, 43, 1; 117-122
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Drying Conditions on the Characteristics and Performance of B/Fe2O3 Nano-Composites Prepared by Sol-Gel Method
    Autorzy:
    Dinçer Yilmaz, Nil Ezgi
    Karakaş, Gürkan
    Powiązania:
    https://bibliotekanauki.pl/articles/358288.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    nanocomposite
    pyrotechnic
    sequential solvent exchange
    proton scavenger
    heat output
    energetic materials
    boron
    Opis:
    B/Fe2O3 samples were prepared by mixing nano sized boron powder with iron oxide xerogels that had been synthesized using a sol-gel method that included various types of proton scavengers such as 1,2-epoxybutane, tetrahydrofuran, 1,4-dioxane and ammonium hydroxide. The effects of the proton scavengers and drying conditions on the textural properties of the iron oxide samples and on the heat output and thermal behavior of the nano-composites were examined. The iron oxide samples were subjected to direct drying (DD) or sequential solvent exchange (SSE). The heat output values of the B/Fe2O3 nano-composites varied from 240 to 1200 J/g depending on the drying condition and the proton scavenger used. It was found that the thermal behaviour and the textural properties of B/Fe2O3 nano-composites (such as porosity, surface area and crystallinity) could be tailored by both the drying conditions and the proton scavenger used.
    Źródło:
    Central European Journal of Energetic Materials; 2020, 17, 1; 85-106
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The MWCNTs-Rh Nanocomposite Obtained By The New High-Temperature Method
    Nanokompozyt MWCNTs-Rh otrzymany nową wysokotemperaturową metodą
    Autorzy:
    Dobrzańska-Danikiewicz, A. D.
    Cichocki, D.
    Łukowiec, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/354120.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    carbon nanotubes
    nanocomposite materials
    rhodium nanoparticles
    transmission electron microscopy
    nanorurki węglowe
    materiały nanokompozytowe
    nanocząstki rodu
    transmisyjna mikroskopia elektronowa
    Opis:
    A nanocomposite was fabricated during the research undertaken, consisting of multiwalled carbon nanotubes coated with rhodium nanoparticles by the new high-temperature method being the subject of the patent claim. High quality multiwalled carbon nanotubes (MWCNTs) with the length of 100÷500 nm and the diameter of 8÷20 nm obtained in advance with Catalytic Chemical Vapour Deposition (CVD) were employed in the investigations. The nanotubes manufactured under the own research contain small amounts of metallic impurities and amorphous carbon deposits. Multiwalled carbon nanotubes functionalisation in acids was applied to deposit rhodium nanoparticles onto the surface of carbon nanotubes, and then the material was placed in a solution being a precursor of rhodium nanoparticles. The material prepared was next placed in a quartz vessel and subjected to high-temperature reduction in the atmosphere of argon to deposit rhodium nanoparticles onto the surface of multiwalled carbon nanotubes. The following examinations were performed, respectively: MWCNTs fabrication, fabrication of a CNT-NPs (Carbon NanoTube-NanoParticles) nanocomposite material; the characterisation of the materials produced including examination of the structure and morphology, and the assessment of rhodium nanoparticles distribution on the surface of carbon nanotubes. Micro- and spectroscopy techniques were employed to characterise the structure of the nanocomposites obtained.
    W ramach wykonanych badań wytworzono nanokompozyt składający się z wielościennych nanorurek węglowych pokrytych nanocząsteczkami rodu nową wysokotemperaturową metodą, będącą przedmiotem zgłoszenia patentowego. W badaniach wykorzystano wysokiej jakości wielościenne nanorurki węglowe MWCNTs o długości 100÷500 nm i średnicy 8÷20 nm uprzednio otrzymane w procesie katalityczno-chemicznego osadzania z fazy gazowej (CCVD). Wytworzone w ramach prac własnych nanorurki zawierają nieznaczne ilości zanieczyszczeń metalicznych i amorficznych depozytów węglowych. W celu osadzenia nanocząsteczek rodu na powierzchni nanorurek węglowych zastosowano funkcjonalizację wielościennych nanorurek węglowych w kwasach, następnie materiał umieszczono w roztworze będącym prekursorem nanocząsteczek rodu. Przygotowany materiał umieszczono w dalszej kolejności w kwarcowym naczyniu i poddano redukcji wysokotemperaturowej w atmosferze argonu w celu osadzenia nanocząsteczek rodu na powierzchni wielościennych nanorurek węglowych. Wykonane badania obejmują kolejno: wytworzenie MWCNTs, wytworzenie materiału nanokompozytowego typu nanorurki węglowe – nanocząsteczki (CNT-NPs), scharakteryzowanie wytworzonego materiału obejmujące badanie jego struktury i morfologii oraz ocenę rozmieszczenia nanocząsteczek rodu na powierzchni nanorurek węglowych. Dla scharakteryzowania struktury otrzymanych nanokompozytów zastosowano techniki mikro- i spektroskopowe.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 1057-1063
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie nanomateriałów metalicznych
    Metallic nanomaterials for advanced applications
    Autorzy:
    Jurczyk, M.
    Nowak, M.
    Niespodziana, K.
    Tulinski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/211748.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
    Tematy:
    materiały w nanoskali
    nanokompozyt Ti-HA
    bezniklowe stale austenityczne
    dwusiarczek molibdenu (MoS2)
    nanoscale materials
    Ti-HA nanocomposite
    Ni-free austenitic stainless steels
    molybdenum disulfide (MoS2)
    Opis:
    Artykuł jest przeglądem badań prowadzonych w Instytucie Inżynierii Materiałowej Politechniki Poznańskiej nad otrzymywaniem materiałów metalicznych z nanostrukturą. Materiały te otrzymywane są metodą mechanicznej syntezy a następnie konsolidowane za pomocą technologii metalurgii proszków. Przykładami otrzymanych nanomateriałów są: nanokompozyt tytan - hydroxyapatyt, nanokrystaliczna bez niklowa stal nierdzewna, mające zastosowanie jako biomateriały, oraz dwusiarczek molibdenu (MoS2) w postaci nanocząstek mający zastosowanie w materiałach inżynierskich. Wynik badań pokazują, iż materiały posiadające nanostrukturę wykazują lepsze właściwości w porównaniu do materiałów tradycyjnych.
    This paper reviews research at the Institute of Materials Science and Engineering, Poznań University of Technology, on the synthesis of nanoscale metallic materials. These materials were prepared by the combination of mechanical alloying and powder metallurgical process. Examples of the materials include a titanium-hydroxyapatite nanocomposite, a nanocrystalline nickel-free stainless steels, both for biomedical applications, and molybdenum disulfide (MoS2) nanoparticles for engineering applications. The results show an enhancement of properties due to the nanoscale structures in bulk consolidated materials.
    Źródło:
    Obróbka Plastyczna Metali; 2006, 17, 4; 27-36
    0867-2628
    Pojawia się w:
    Obróbka Plastyczna Metali
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperelastic modelling of rubber with multi-walled carbon nanotubes subjected to tensile loading
    Autorzy:
    Jweeg, M.J.
    Alazawi, D.A.
    Jebur, Q.H.
    Al-Waily, M.
    Yasin, N.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200544.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    rubber nanocomposite materials
    rubber characterisation
    rubber nanocomposite
    strain energy
    hyperelastic materials model
    rubber modelling
    gumowe materiały nanokompozytowe
    charakterystyka gumy
    nanokompozyt gumowy
    energia odkształcenia
    model materiałów hiperelastycznych
    modelowanie gumy
    Opis:
    Purpose: This study thoroughly examined the application of inverse FE modelling and indentation tensile tests to identify nanotubes' rubber material properties. indentation tensile tests to identify nanotubes' rubber material properties. Design/methodology/approach: Carbon nanotubes with various percentages of multi-walled carbon nanotubes exposed to high tensile stress were used to enhance the mechanical qualities of N.R. rubber. Findings: In this work, carbon nanotubes have been added to natural rubber. By using a solvent casting technique, toluene was used to make nanocomposites. 0.2%, 0.4%, 0.6%, 0.8%, and 1%. In this article, rubber and multi-walled carbon nanotubes interact in practical ways. Mechanical features of carbon nanotubes in NR have been researched. The results will lead to rubber products with improved mechanical qualities compared to present nanocomposite rubber containing various percentages of multi-walled carbon nanotubes exposed to large tensile test loading. The relative fitness error for significant stresses is reasonable with a second or third-order deformation model in numerical results. Research limitations/implications: Non-linear finite element analysis is widely used to optimise complicated elastomeric components' design and reliability studies. However, accurate numerical results cannot be achieved without using rubber or rubber nanocomposite materials with reliable strain energy functions. Practical implications: The indentation tensile tests of rubber samples have been simulated and confirmed using a parametric FE model. An inverse materials parameter identification algorithm was used to calculate the hyperelastic material properties of rubber samples evaluated in uniaxial tensile. Using ABAQUS FE software, material parameters and force-displacement data may be automatically updated and extracted. Originality/value: The numerical data for the inverse method of material property prediction has been successfully established by developing simulation spaces for various material characteristics. The force-displacement curve can be represented using technical methods. The results demonstrate that the inverse FE modelling process might be simplified by using these curve fitting parameters and plot equations to build a mathematical link between curve coefficients and material properties. The first, second, and third-order deformation models were tested using FE simulations for the tensile test.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 114, 2; 69--85
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Progress in Fabrication Technology of Silver-Based Contact Materials with Particular Account of the Ag-Re and Ag-SnO2Bi2O3 Composites
    Postęp w technologii wytwarzania materiałów stykowych na bazie srebra ze szczególnym uwzględnieniem kompozytów Ag-Re i Ag-SnO2Bi2O3
    Autorzy:
    Księżarek, S.
    Woch, M.
    Kołacz, D.
    Kamińska, M.
    Borkowski, P.
    Walczuk, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/354164.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric contacts
    nanocomposite
    contact materials
    electrical properties
    tested methods
    styki elektryczne
    nanokompozyt
    materiały stykowe
    właściwości elektryczne
    erozja łuku
    Opis:
    The paper outlines technologies currently used for the production of the Ag-Re10 and Ag-SnO2Bi2O3 contact materials in a form of wires and solid and bimetallic rivets. Their characteristic parameters, including physical and mechanical properties and microstructure, are given. It has been found that the level of these parameters, particularly electrical properties (resistance to electric arc erosion), is unsatisfactory considering the present requirements, which applies mainly to the new Ag-Re10 [wt%] alloy, so far not fully technologically mastered. Therefore, under this work a new method for the production of this type of materials has been designed and the related research works were undertaken. The new-generation contact materials in a form of nanostructured composites will be characterised by similar chemical compositions as those specified above but with increased functional properties, including enhanced resistance to arc erosion. In this paper preliminary results of the examination of structure and properties of semi-products obtained by new technology based on powder metallurgy techniques are presented. Conditions for pressure consolidation and plastic consolidation applied for material processing into wires and rivets (solid and bimetallic) have been determined.
    W referacie przedstawiono stosowany aktualnie zarys technologii wytwarzania materiałów stykowych Ag-Re 10 i Ag-SnO2Bi2O3 w postaci drutów oraz nitów litych i bimetalowych i jednocześnie podano ich charakterystyczne parametry obejmujące właściwości fizyko-mechaniczne i mikrostrukturę. Stwierdzono, że poziom uzyskiwanych właściwości-szczególnie elektrycznych (odporność na| erozję łuku elektrycznego) jest niezadawalający w świetle aktualnych wymagań, co dotyczy głów- nie nowego jeszcze nie w pełni opanowanego technologicznie materiału Ag-Re 10%wag. Zaprojektowano wiec nowy sposób wytwarzania tego typu materiałów i podjęto prace badawczo rozwojowe w tym zakresie. Ich celem jest opracowanie sposobu wytwarzania nowej generacji materiałów stykowych w postaci kompozytów o podobnym składzie chemicznym jednakże charakteryzujących się nanostrukturą i znacznie wyższymi parametrami - głównie odpornością na działanie łuku elektrycznego. Przedstawiono wstępne wyniki badań obejmujące syntezę mechaniczną oraz określono warunki konsolidacji odkształceniowej i plastycznej w procesie ich przeróbki na druty i nity lite i bimetalowe, bazując na procesach z obszaru metalurgii proszków.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 2; 501-508
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kierunki rozwoju biodegradowalnych materiałów skrobiowo-poliuretanowych
    Directions in development of biodegradable starch - polyurethane materials
    Autorzy:
    Kugler, Sz.
    Powiązania:
    https://bibliotekanauki.pl/articles/1287233.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    materiały skrobiowo-poliuretanowe
    biodegradowalność
    nanokompozyt
    starch - polyurethane materials
    biodegradability
    nanocomposite
    Opis:
    Przedstawiono przegląd najnowszych kierunków badań w zakresie polimerów skrobiowo-poliuretanowych. Omówiono przeprowadzone w ostatniej dekadzie wybrane procesy modyfikacji skrobi, otrzymywania materiałów skrobiowo-poliuretanowych oraz zastosowane metody badawcze, a także potencjalne kierunki zastosowań polimerów skrobiowo-poliuretanowych.
    This article contains review of the newest research results in the starch-polyurethane polymers. It includes description of the selected starch modification processes and manufacture of starch-polyurethane materials, performed in the last decade. Moreover, methods of evaluation and potential applications of these polymers have been described.
    Źródło:
    Chemik; 2010, 64, 7-8; 531-538
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation between Microstructure and Exothermic Reaction Kinetics of Al-CuO Thermite Nanocomposite Powders Fabricated by Cryomilling
    Autorzy:
    Oh, Minseok
    Kim, Kwanil
    Ahn, Byungmin
    Powiązania:
    https://bibliotekanauki.pl/articles/355529.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-CuO
    thermite
    nanocomposite
    cryomilling
    high energy density materials
    Opis:
    Al-CuO is a thermite material exhibiting the exothermic reaction only when aluminum melts. For wide spread of its applica-tion, the reaction temperature needs to be reduced in addition to the enhancement of total reaction energy. In the present study, a thermite nanocomposite with a large contact area between Al and CuO was fabricated in order to lower the exothermic reaction temperature and to improve the reactivity. A cryomilling process was performed to achieve the nanostructure, and the effect of composition on the microstructure and its reactivity was studied in detail. The microstructure was characterized using SEM and XRD, and the thermal property was analyzed using DSC. The results show that as the molar ratio between Al and CuO varies, the fraction of uniform nanocomposite structure was changed affecting the exothermic reaction characteristics.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 931-934
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibrational spectroscopy investigation of montmorillonite - chitosane nanocomposite materials
    Autorzy:
    Paluszkiewicz, C.
    Stodolak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/283761.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    biomaterials
    nanocomposite materials
    vibrational spectroscopy
    Opis:
    Biomaterials basing on natural polysaccharides, i.e. hiauronic acid, alginate, chitosane are an alternative for already applied bioresorbable synthetic materials basing on synthetic polyhydroxyacids. Their main advantages are good accessibility, low cost, easy forming and high biocompatibility. Additionally, they are a perfect matrix for bioactive nanoparticles i.e. hydroxyapatite (HAp), tricalcium phosphate (TCP) and silica (SiO2). The work presents results of research on nanocomposite consisting of chitosane matrix (CS) modified with a nanofiller, which was natural montmorillonite (MMT). Nanocomposite foils were produced by the casting method. In order to induce better biocompatibility, the surface of the CS/MMT composite was neutralized (bath in NaOH solution). The nanocomposite foils were subjected to a bioactivity test by incubation in SBF at 37oC for 7 days. It was observed that the CS/MMT material surface showed a local supersaturation, which was a result of apatite nucleation. The CS/MMT nanocomposites were investigated using FT-IR (Fourier Transform Infrared Spectroscopy) and Fourier Raman Spectroscopy. FTIR measurements of the samples were carried out on the transmission and reflection modes. The FTIR microscopy spectra were collected using Bio-Rad Excalibur with ATR attachment as well as microscope UMA500 equipped with MCT detector. Spectra were measured at 4 cm-1 resolution in the region from 4000 cm-1 to 600 cm-1. FT-Raman spectra were obtained using a FTS6000 Bio-Rad spectrometer with Ge detector. The samples were excited with a Nd-YAG laser (1064nm). Additional all materials in all steps experiments were observed under Scanning Electron Microscopy (Nova NanoSEM). Vibrational spectroscopy methods (FT Raman and FTIR) can be used for investigation of nanocomposite foils basing on biopolymers. High sensitivity the applied spectroscopy techniques show that in the result of the neutralization of CS/MMT foil (via incubation in NaOH solution) the biopolymer chain breaks. This phenomena is visible by intensity ratio between COC/ COH bands. Increase of reactivity of chitosane chain lead to entrapment of PO43-, which is the origin of the apatite forms nucleation process. Chemical treatment of the nanocomposite foils, i.e. NaOH washes influences their chemical structure and microstructure. Neutralisation of the foils is the first processing stage which precedes the potential use of CS/MMT foils in biomedical applications. The materials show a tendency to apatite crystallisation which may support regeneration of damaged bone tissue. The applied spectroscopic methods allowed to observe changes in the whole volume of the sample. Individual ATR measurements taken at various spectral ranges and penetration depths allow to observe subtle changes in the polymer matrix caused by chemical treatment (NaOH and SBF incubation). Results of the investigations indicate that in the CS/ MMT systems new chemical bonds and related to them vibrations appear. Quantity and quality of the interactions is related to characteristics of the nanoparticle and the presence of forming apatite structures.
    Źródło:
    Engineering of Biomaterials; 2010, 13, no. 99-101; 128
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibrational spectroscopy investigation of montmorillonite-chitosane nanocomposite materials
    Autorzy:
    Paluszkiewicz, C.
    Stodolak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/283827.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    spectroscopy
    chitosan
    nanocomposite materials
    Opis:
    Biomaterials basing on natural polysaccharides, i.e. hiauronic acid, alginate, chitosane are an alternative for already applied bioresorbable synthetic materials basing on synthetic polyhydroxy acids. Their main advantages are good accessibility, low cost, easy forming and high biocompatibility. Additionally , they are a perfect matrix for bioactive nanoparticles i.e. hydroxy apatite (HAp), tricalcium phosphate (TCP) and silica (SiO2). The work presents results of research on nanocomposite consisting of chitosane matrix (CS) modified with a nanofiller, which was natural montmorillonite (MMT). Nanocomposite foils were produced by the casting method. In order to induce better biocompatibility, the surface of the CS/MMT composite was neutralized (bath in NaOH solution). The nanocomposite foils were subjected to a bioactivity test by incubation in SBF at 37oC for 7 days. It was observed that the CS/ MMT material surface showed a local supersaturation, which was a result of apatite nucleation. The CS/ MMT nanocomposites were investigated using FT-IR ( Fourier Transform Infrared Spectroscopy) and Fourier Raman Spectroscopy. FTIR measurements o f the samples were carried out on the transmission and reflection modes. The FTIR microscopy spectra were collected using BioRad Excalibur with ATR attachment as well as microscope UMA500 equipped with MCT detector. Spectra were measure at 4 cm -1 resolution in the region from 4 000 cm -1 to 600 cm -1 . FT-Raman spectra were obtained using a FTS 6000 Bio-Rad spectrometer with Ge detector. The samples were excited with a Nd-YAG laser (1064nm). Additional all materials in all steps experiments were observed under Scanning Electron Microscopy (Nova Nano SEM). Vibrational spectroscopy methods (FT Raman and FTIR) can be used for investigation of nanocomposite foils basing on biopolymers. High sensitivity the applied spectroscopy techniques show that in the result of the neutralization of CS/ MMT foil (via incubation in NaOH solution the biopolymer chain breaks. This phenomena is visible by intensity ratio between COC/COH bands. Increase of reactivity of chitosane chain lead to entrapment of PO4+3-, which is the origin of the apatite forms nucleation process. Chemical treatment of the nanocomposite foils, i.e. NaOH washes in fluences their chemical structure and microstructure. Neutralisation of the foils is the first processing stage which precedes the potential use o fCS/ MMT foils in biomedical applications. The materials show a tendency to apatite crystallisation which may support regeneration of damaged bone tissue. The applied spectroscopic methods allowed to observe changes in the whole volume of the sample. Individual ATR measurements taken at various spectral ranges and penetration depths allow to observe subtle changes in the polymer matrix caused by chemical treatment (NaOH and SBF incubation). Results of the investigations indicate that in the CS/ MMT systems new chemical bonds and related to them vibrations appear. Quantity and quality of the interact ions is related to characteristics of the nanoparticle and the presence of forming apatite structures.
    Źródło:
    Engineering of Biomaterials; 2011, 14, no. 109-111 spec. iss.; 44
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degradation of nanoclay-filled polylactide composites
    Autorzy:
    Rapacz-Kmita, A.
    Stodolak-Zych, E.
    Dudek, M.
    Szaraniec, B.
    Rozycka, A.
    Mosialek, M.
    Mandecka-Kamien, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/110832.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nanocomposite materials
    food packaging
    polymer
    smectite clay
    Opis:
    Nanoclay-filled polylactide (PLA 3051D) composite materials were tested in this study and their capacity for degradation was investigated. Activated and lyophilized smectite clay was used. The filler, its morphology, and grain size distribution were characterized by the use of transmission electron microscopy, scanning electron microscopy, and the dynamic light scattering technique. Samples of pure polylactide and polylactide filled with 3% wt., 5% wt., and 10% wt. of nanoclay in subsequent series were obtained by injection molding. The optimum amount of the filler in the nanocomposites was evalu-ated based on an assessment of mechanical properties as well as capacity to degrade. The 3% wt. mass fraction of nanofiller in the polylactide matrix was found to be the most effective in enhancement of both tensile strength (RM) and Young’s Modulus (E). It was also reported that polylactide nanocomposites filled with 3% wt. of smectite clay were characterized by the highest decrease in molecular mass of the matrix polymer after degradation tests (6 weeks incubation in water at 80°C). The observed decrease in degradation time and the overall changes distinguished in the nanocomposite structure suggest the poten-tial for application of the material in the packaging industry.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 1; 91-99
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analytical study on the nonlinear forced vibration of functionally graded carbon nanotube-reinforced composite beams on nonlinear viscoelastic foundation
    Autorzy:
    Shafiei, H.
    Setoodeh, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/38443939.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    nonlinear forced vibration
    nanocomposite beams
    functionally graded materials
    nonlinear viscoelastic foundation
    Opis:
    This paper deals with the nonlinear forced vibration of nanocomposite beams resting on a nonlinear viscoelastic foundation and subjected to a transverse periodic excitation. It is considered that the functionally graded carbon nanotubereinforced composite (FG-CNTRC) beam is made of an isotropic matrix reinforced by either aligned- or randomly oriented-straight single-walled carbon nanotubes (SWCNTs) with four types of distributions through the thickness direction of the beam. Both the Eshelby–Mori–Tanaka approach and extended rule of mixtures are used to predict the effective material properties of the FG-CNTRC beams. The mathematical model of the beam is developed based on the Euler–Bernoulli beam theory together with von Kármán assumptions. Subsequently, the accurate analytical solutions of the governing equation are obtained through applying the variational iteration method (VIM). Several examples are verified to have higher accuracy than those available in the literature. In addition, a comprehensive investigation into the effect of carbon nanotubes (CNTs) distribution, CNTs volume fraction, end supports, vibration amplitude, and foundation coefficients on the vibrational characteristics of the nanocomposite beam is performed and some new results are presented.
    Źródło:
    Archives of Mechanics; 2020, 72, 2; 81-107
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biocompatibility of hybrid fibrous materials basing on poly-L/DL-lactide
    Autorzy:
    Stodolak, E.
    Ścisłowska-Czarnecka, A.
    Błażewicz, M.
    Bogun, M.
    Mikolajczyk, T.
    Menaszek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/286193.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    hybrid biomaterials
    composites
    nanocomposite materials
    Opis:
    Hybrid biomaterials due to their unique structure may become an alternative for many popular composite and nanocomposite materials. Multilevel modification of their matrix manifesting itself in the presence of particles of different sizes i.e., micrometric, submicrometric and nanometric together with the variety of shapes of a modyfing phase (nanometric fibres, submicron particles, coated nanoparticles) and its different chemical character make the hybrid materials similar to natural tissue. Bone tissue structure is particulary close to this model in which collagen fibres and hydroxyapatite particles and nanoparticles have not only different form but first of all they play different role in the tissue which depends on their chemical nature. In the biomedical engineering syntetic hybride biomaterials are usually produced using resorbable and degradable polymer matrices and inorganic filers (ceramic bioactive particles; HAp, TCP, SiO2) or organic filers (collagen, polysaccharides e.g. alginate fibres). The main function of the modyfing phase is inprovement of the polymer matrix leading to bioactive, stronger material showing high biofunctionality. Production of hybrid materials is based mainly on experimental works, which is related to the presence in their matrix few phases with different properties which may interact. Hybrid materials do not follow the rule of mixtures thus it is difficult to predict behaviour of a material in which co-exis different chemical and phisical phases. In the work hybrid composite foils were produced in which modyfing phase consisted in; nanocomposite calcium alginate fibres modyfied with ceramic nanoparticles; HAp (CAH fibres), TCP (CAT fibres), SiO2 (CAS fibres) and MMT (CAM fibres). Short fibres were subjected to additional size reduction in vibration ball mill resultiong in submicron and nanometric phases. Size of the particels after grinding was determined by screening analysis and DLS method (for particels smaller than 500 nm). It was observed than the population of short fibres consist in three fractions i.e.; micrometric (~2μm, 50 wt.%), submicrometric (500–800 nm, 40 wt.%) and nanometric ( below 500 nm, 10 wt.%). The fibres and products of their grinding were homogenised in P(L/ DL)LA polymer solution (poly-L/DL-lactide, Purarorb 80, Purac Germany). A hybride material in the form of thin foils containing 2 wt.% of a modyfing phase were subjected to durability tests consisting in incubation in distilled water (30 days/37C). Monitoring of the medium pH and conductivity did not show changes related to harmful products of their decomposition. Osteoblast-like cells from MG-63 line contacted with the surface of the materials showed high viability (MMT test) comparable with the reference material (TCPS). High degree of adherence of the cells to the materal surface (CV test) testifies of potential abilities of the material stimulating proliferation of bone tissue cells. The highes rate of dynamic growth (increase of the cells number after 7 days of incubation) was observed for the material which was modified with CAS fibres and products of their grinding. The performed investigations have a preliminary character. Their results testify for potential osteoconductive or osteoinductive abilities of hybride materials basing on P(L/DL)LA and alginate nanocomposite fibres.
    Źródło:
    Engineering of Biomaterials; 2010, 13, no. 99-101; 110
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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