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Wyświetlanie 1-15 z 79
Tytuł:
The Wear Mechanisms Description Of Multilayer Coatings, Performed By Transmission Electron Microscopy – An Overview Of The Own Research Work
Opis mechanizmu zużycia wielowarstwowych powłok w oparciu o transmisyjną mikroskopię elektronową – przegląd własnych badań doświadczalnych
Autorzy:
Major, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/351356.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multilayer coatings
TEM characterization
wear mechanisms
powłoki wielowarstwowe
TEM
mechanizm zużycia
Opis:
The aim of the presented paper was to describe the wear mechanisms operating at the small length scale in multilayer coatings subjected to a mechanical testing. A hybrid PLD system (Pulsed Laser Deposition connected with magnetron sputtering) was used for the multi-layer coating deposition. Coatings were subjected to indentation, ball-on disc wear and scratch adhesion tests. Microstructure of the as-deposited coating and after mechanical tests was studied using the Scanning (SEM) and the Transmission (TEM) Electron Microscopes. The research work revealed that application of innovative multilayer coatings may allow to predict their life time and to steer their properties.
Celem pracy było określenie mechanizmów zużycia wielowarstwowych powłok tribologicznych, poddanych testom mechanicznym na zużycie. Powłoki wytwarzane przy zastosowaniu hybrydowego układu PLD (technika laserowej ablacji połączona z rozpylaniem magnetronowym) poddane zostały mechanicznym testom na zużycie (indentacja oraz test kula-tarcza), a także testowi przylegania powłoki do podłoża (test zarysowania). Charakterystykę mikrostruktury powłok przed i po testach mechanicznych przeprowadzono za pomocą skaningowej (SEM) oraz transmisyjnej (TEM) mikroskopii elektronowej. Badania wykazały, że poprzez stosowanie innowacyjnych powłok wielowarstwowych można przewidzieć czas ich eksploatacji oraz dają możliwość sterowania właściwościami.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3; 2319-2326
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of hydroxyapatite crystals in oral care products using the TEM method
Autorzy:
Pajchel, Ł.
Malicka, A.
Pajchel, A.
German, R.
Kolodzijski, W.
Powiązania:
https://bibliotekanauki.pl/articles/285619.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
hydroxyapatite
crystals
TEM method
Źródło:
Engineering of Biomaterials; 2018, 21, 148; 42
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to prepare bacteria with adsorbed nanoparticles for SEM and TEM observations
Autorzy:
Pajerski, W.
Golda-Cepa, M.
Jarosz, M.
Indyka, P.
Pawlyta, M.
Kotarba, A.
Powiązania:
https://bibliotekanauki.pl/articles/286070.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanoparticles
SEM observation
TEM observation
Źródło:
Engineering of Biomaterials; 2018, 21, 148; 67
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing time effects on the surface morphology of C–Pd films prepared on silicon covered with SiO2
Autorzy:
Kozlowski, M.
Radomska, J.
Wronka, H.
Czerwosz, E.
Firek, P.
Sobczak, K.
Dluzewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/949412.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Pd
carbon
film
SEM
TEM
Opis:
Morphology changes of C–Pd films prepared in physical vapor deposition (PVD) process and next annealed in a temperature of 650 °C during different time were studied. These studies were performed with electron microscopy methods (scanning SEM and transmission TEM). It was found that not annealed films are flat and they are composed of grains with composite character and size of 100–200 nm. Pd nanocrystallite of a diameter of a few nanometers in some carbon matrix was placed in these grains. For annealed films, a formation of palladium nanograins with different sizes and shapes as well as a porous carbon matrix were observed. High resolution TEM investigation was used to determine a structure of all these grains. An increase in duration time of annealing process led to diminishing of the porosity of carbon matrix and a number of Pd grains situated on the film surface. It was also stated that covering of Si with SiO2 layer prevents formation of palladium silicide.
Źródło:
Optica Applicata; 2013, 43, 1; 81-89
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biosynthesis of antibacterial silver nano-particles from Aspergillus terreus
Autorzy:
Singh, P. Shivakumar
Vidyasagar, G. M.
Powiązania:
https://bibliotekanauki.pl/articles/1112999.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bio-synthesis
Silvernanoparticles
TEM
UV
Opis:
This paper deals with the bio-synthesis of silver nano-particles using a soil fungi. In this work, FTIR examinations indicated that the encountered soil particles actually contained Silver particles, while XRD analysis confirmed the silver was in the nano-crystalline phase. Moreover, the hurried decline of silver (Ag+) ions monitored using UV-visible spectrophotometer, demonstrated that these silver nano-particles formed within 19 minutes. In addition, transmission electron microscopy (TEM) revealed that the synthesized silver nano-particles come in a size ranging between 16-57 nm and have a variety of shapes, including round, rod and uneven. The present study thus concludes that silver nano-particles were actually produced and that these have admirable antibacterial activity. The current study also indicates that increasing concentration increases the rate of reduction and decreases the particle size.
Źródło:
World News of Natural Sciences; 2018, 16; 109-116
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of technological PVD process parameters on the topography, crystal and molecular structure of nanocomposite films containing palladium nanograins
Autorzy:
Rymarczyk, J.
Czerwosz, E.
Kozłowski, M.
Dłużewski, P.
Kowalski, W.
Powiązania:
https://bibliotekanauki.pl/articles/778619.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
palladium
carbon
SEM
AFM
TEM
FTIR
Opis:
The paper describes the preparation and characteristics of films composed of Pd nanograins placed in carbonaceous matrix. Films were obtained in PVD (Physical Vapor Deposition) process from two sources containing: the first one – fullerene powder and the second one – palladium acetate. The topographical, morphological and structural changes due to different parameters of PVD process were studied with the use of Atomic Force Microscopy and Scanning Electron Microscopy, whereas the structure was studied with the application of the Transmission Electron Microscopy and Fourier Transform Infrared Spectroscopy methods. It was shown that topographical changes are connected with the decomposition ratio of Pd acetate as well as the form of carbonaceous matrix formed due to this decomposition. Palladium nanograins found in all films exhibit the fcc structure type and their diameter changes from 2 nm to 40 nm depending on the PVD process parameters.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 3; 18-24
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Morphology and Structure of ZnO Thin Films Deposited by ALD Method
Autorzy:
Boryło, P.
Matus, K.
Lukaszkowicz, K.
Gołombek, K.
Powiązania:
https://bibliotekanauki.pl/articles/352603.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ALD
ZnO
SEM
TEM
UV/VIS
Opis:
This paper presents research results of zinc oxide thin films deposited on a glass substrate with use of ALD method. Our researches focused on analyzing of the influence of ALD deposition process temperature on the morphology and transparency of thin layers. The morphology was examined using both scanning and transmission electron microscopes. Transparency study was performed by UV-VIS spectroscopy. For our experiments, two sets of the coating have been prepared, differing in temperature and number of cycle used during the preparation process. The first set was deposited in 100 cycles, second one in 500 cycles. Each set of tested coating contained samples prepared at different temperatures.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 129-133
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Different Plants Extracts on Silver Nanopar ticles Green Synthesis
Autorzy:
Velgosova, O.
Mražíková, A.
Veselovský, L.
Willner, J.
Fornalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/351682.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanoparticles
silver
biosynthesis
reduction agents
TEM
Opis:
Three plants extracts were used for biosynthesis of Ag nanoparticles (AgNPs). AgNPs nucleation process requires effective reduction agents which secure Ag+ to Ag0 reduction and also stabilizing/capping agents. The UV-vis and TEM observation revealed that the best results were obtained by R. officinalis leaf extract. The strong SPR band peak appeared at the wavelength 418 nm. Synthetized AgNPs were globular, fine (~20 nm), uniform and stabile throughout the experiment. A rapid rate of AgNPs synthesis was also significant and economically advantageous factor. Fine (10-20 nm) and globular nanoparticles were synthetized also by U. dioica leaf extract, but the stability of nanoparticles was not permanent. Despite V. vitis-idaea fruit extract contains a lot of reducing agents, UV-vis did not confirm the presence of AgNPs in solution. Synthetized Ag particles were very unstable, Ag particles agglomerated very fast and clearly indicated sediment was formed.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 665-670
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradation of Creep Resistant Ni - alloy During Aging at Elevated Temperature Part II: Structure Investigations
Autorzy:
Kaczorowski, M.
Skoczylas, P.
Krzyńska, A.
Powiązania:
https://bibliotekanauki.pl/articles/381511.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni-base superalloy
structure investigations
SEM observation
TEM observation
nadstop niklu
badanie struktury
obserwacja SEM
obserwacja TEM
Opis:
The results of structure observations of Ni base superalloy subjected to long-term influence of high pressure hydrogen atmosphere at 750K and 850K are presented. The structure investigation were carried out using conventional light-, scanning- (SEM) and transmission electron microscopy (TEM). The results presented here are supplementary to the mechanical studies given in part I of this investigations. The results of study concerning mechanical properties degradation and structure observations show that the differences in mechanical properties of alloy subjected different temperature are caused by more advanced processes of structure degradation during long-term aging at 850K, compare to that at 750K. Higher service temperature leads to formation of large precipitates of δ phase. The nucleation and growth of needle- and/or plate-like, relative large delta precipitates proceed probably at expense strengthening γ" phases. Moreover, it can't be excluded that the least stable γ" phase is replaced with more stable γ' precipitates. TEM observations have disclosed differences in dislocation structure of alloy aged at 750K and 850K. The dislocation observed in alloy subjected to 750K are were seldom observed only, while in that serviced at high stress and 850K dislocation array and dislocation cell structure was typical.
Źródło:
Archives of Foundry Engineering; 2015, 15, 4; 45-50
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tem Observation Of Age-Hardening Precipitation In Mg-Gd-Y Alloys As Different Gd/Y Ratio
Zastosowanie mikroskopii TEM do obserwacji wydzieleń po utwardzaniu wydzieleniowym w stopach Mg-Gd-Y o różnych stosunkach Gd/Y
Autorzy:
Matsuoka, Y.
Watanabe, K.
Nakamura, J.
Lefebvre, W.
Saikawa, S.
Ikeno, S.
Matsuda, K.
Powiązania:
https://bibliotekanauki.pl/articles/351744.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Mg-RE alloy
precipitation behavior
TEM
HAADF-STEM
stop Mg-RE
zachowanie wydzieleń
transmisyjna mikroskopia elektronowa (TEM)
Opis:
In this study, the early stage of aging in Mg-Gd-Y alloys has been observed by transmission electron microscopy (TEM), high angle annular dark field – scanning transmission electron microscopy (HAADF-STEM) and calculations of images and electron density and bond overlap population (BOP) by first principal to understand the origin of precipitation in this alloy. The small hexagon of 0.37 nm is the first precipitate in this alloy, and this is the evidence of short range ordering of D019 structure. This is referred as the pre β”-phase. In the peak aged condition, β’ phase with bco structure was mainly observed.
W pracy przedstawiono mikroskopowe obserwacje TEM wczesnego etapu starzenia stopów Mg-Gd-Y. Ponadto badania prowadzono z użyciem skaningowej transmisyjnej mikroskopii elektronowej. Wykorzystano zjawisko niekoherentnego rozpraszania w ciemnym polu i materiał obrazowano przy pomocy detektora pierścieniowego, który zbiera elektrony rozproszone pod dużymi kątami (HAADF-STEM). Przeprowadzono także analizę obrazów, obliczenie gęstości elektronowej i ilości nakładających się wiązań w celu zrozumienia źródła wydzieleń w ww. stopie. Pierwszym wytrąceniem w stopie jest mały sześciokąt o wielkości 0,37 nm, a dowodem tego jest uporządkowanie krótkiego zasięgu struktury D019.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 971-972
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural characterization of room-temperature synthesized fullerene nanowhiskers
Autorzy:
Miyazawa, K.
Minato, J.
Mashino, T.
Nakamura, S.
Fujino, M.
Suga, T.
Powiązania:
https://bibliotekanauki.pl/articles/146219.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
carbon
C60
fullerene
nanowhisker
structure
TEM
Opis:
Structural properties of various kinds of room-temperature synthesized C60 fullerene nanowhiskers were investigated by TEM and XRD. The C60 nanowhiskers prepared by use of toluene lost their initial solvated hexagonal structure faster than the C60 nanowhiskers prepared by use of m-xylene. The hexagonal structure of C60 nanowhiskers prepared by use of toluene was stabilized by adding C60[C(COOC2H5)2]. These results suggest that large solute molecules in the C60 nanowhisker matrix stabilize their initially solvated hexagonal structure. Furthermore, the addition of a sufficient amount of C60(2-methoxycarbonyl-N-methylpyrrolidine) into the m-xylene solution of C60 produced the C60 nanowhiskers indicating the formation of ordered solid solution of C60 and C60(2-methoxycarbonyl-N-methylpyrrolidine).
Źródło:
Nukleonika; 2006, 51,suppl.1; 41-48
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Highly developed construction of Heterostructured InWO3-InMoO3 loaded-TiO2 nanomaterial and Expanding multi-application
Autorzy:
Kamalakkannan, J.
Senthilvelan, S.
Powiązania:
https://bibliotekanauki.pl/articles/1178704.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
HR-TEM
Photocatalytic
antibacterial activity
electrochemical study
Opis:
InWO3-InMoO3 loaded-TiO2 nanomaterial was synthesised by co-precipitation method and sonication technique. The nanomaterial was characterized by High-resolution scanning electron microscopy (HR-SEM) with elementary dispersive X-ray (EDX), High-resolution transmission electron microscopy (HR-TEM), photoluminescence spectroscopy (PL) and UV-Vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity of InWO3-InMoO3 loaded-TiO2 nanomaterial was studied from the photodegradation of methyl green (MEG) and methylene blue (MB) under UV-light irradiation at 365 nm. The hydroxyl radical formation in the mechanism was confirmed by fluorescence quenching technique. The mineralization confirmed by chemical oxygen demand measurements. A flaxisible mechanism is proposed for higher catalytic activity of InWO3-InMoO3-TiO2 under UV-light for 365 nm. This catalyst was found to be stable and reusable without appreciable loss of catalytic activity up to five cycles. The InWO3- InMoO3 loaded-TiO2 nanomaterial on MEG was high photocatalytic activity that of MB so high photocatalytic activity has been discussed by first order kinetics, rate constant value and high quantum yield. This material was showed increased hydrophobicity that of TiO2 electrochemical study and antibacterial activity of the analysis was also studied.
Źródło:
World Scientific News; 2017, 67, 2; 338-364
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ohmic contacts for room-temperature AlGaAs/GaAs quantum cascade lasers (QCL)
Autorzy:
Baranska, A
Szerling, A
Karbownik, P
Hejduk, K
Bugajski, M
Laszcz, A
Golaszewska-Malec, K
Filipowski, W
Powiązania:
https://bibliotekanauki.pl/articles/949413.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ohmic contacts
n-GaAs
CTLM
EDXS
TEM
Opis:
This paper reports on the results of optimization of the ohmic contacts for GaAs/AlGaAs quantum cascade lasers (QCLs). Technological parameters during the optimization procedure concerned time and temperature of thermal processing as also the ratio of metallic layers thickness. The main goal of this work was to obtain stable ohmic contacts with low resistance and a smooth surface. Circular transmission line method (CTLM) was applied for the electrical characterization of the Ni/AuGe/Ni/Au and AuGe/Ni/Au metallization systems. Transmission electron microscopy (TEM) method was used for the characterization of microstructures. Elements concentration in layers was determined by the energy dispersive X-ray spectroscopy (EDXS). The best results for the specific contacts resistivity, thermal stability and morphology were obtained when the Ni/AuGe/Ni/Au and the AuGe/Ni/Au systems were processed at 440 °C and 400 °C, respectively.
Źródło:
Optica Applicata; 2013, 43, 1; 5-15
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and characterization of TiO2 and TiO2P25 nanomaterial and photocatalytic application
Autorzy:
Kamalakkannan, J.
Karthikeyan, B.
Senthilvelan, S.
Powiązania:
https://bibliotekanauki.pl/articles/1182809.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
HR-SEM
HR-TEM
Photocatalytic properties
Reusable
Opis:
TiO2 nanomaterial was prepared by precipitation method and sonication technique. The nanomaterial was characterized by HR-SEM with EDX, TEM, XRD, FT-IR and PL analysis. The photocatalytic activity of TiO2 was much better than that of TiO2–P25 under UV-light irradiation at 365 nm. The photocatalytic activity was evaluated from the photodegradation of malachite green (MAG). The influence of operational parameters such as the effect of catalyst loading dye concentration and chemical oxygen demand measurements had also been investigated. The Photodegradation was found to follow the pseudo-first-order kinetics. Hydroxyl radical formation in the mechanism was confirmed by fluorescence quenching technique. It was proposed that the catalyst is found to be stable and reusable.
Źródło:
World Scientific News; 2017, 65; 81-93
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure, Chemical and Phase Composition of Clad Layers of Inconel 625 and Inconel 686
Autorzy:
Solecka, M.
Kopia, A.
Petrzak, P.
Radziszewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/351519.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Inconel 625
Inconel 686
SEM
EDS
TEM
Opis:
The article presents the investigation results of microstructural, chemical composition changes after clad layers of Inconel 625 and Inconel 686 alloys weld overlaid on boiler tubes. The boiler tubes made of 16Mo3 steel were cladded in the Boiler Factory SEFAKO S.A. using CMT technique. The microstructure and chemical composition of coatings were analysed using light microscopy, scanning and transmission electron microscopy. The value of the partition coefficient k was determined for Inconel 625 and Inconel 686 clad layers. The value was calculated by dividing the average content (% wt.) of Ni, Cr, Mo, Fe, Nb and W.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 513-518
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 79

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