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Wyświetlanie 1-15 z 39
Tytuł:
Granulation Of Porous Materials with Phase Change Material (PCM)
Autorzy:
Bien, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1955942.pdf
Data publikacji:
2021
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
PCR
SEM
XRD
DSC
Opis:
The paper describes the research on the method of production of granulated phase-change materials (PCM) used in construction industry for the accumulation of thermal energy. As mineral materials for the granules preparation zeolite from fly ash Na-P1 and natural diatomite dust were used which were impregnated with paraffinic filtration waste and granulated using a combined granulation method. Obtained granules were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption/desorption isotherm, and differential scanning calorimetry (DSC). Mechanical strength of the materials was determined in a “drop strength” test. Performed analyses revealed that mineral composition and micromorphology of the diatomite and zeolite granules were varied, with zeolite granules having higher mechanical strength.
Źródło:
Budownictwo i Architektura; 2021, 20, 3; 135-144
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
pH Dependent Degradation and Characterization of Geopolymer Structures Derived from Fly Ash
Autorzy:
Şahbudak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1033454.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Geopolymer
alkaline
pH
SEM
XRD
Opis:
Geopolymer structures are a relatively new family of un-fired ceramics that are produced by alkaline slurry of mixed alumina silicate-based materials. One of the most abundant geopolymer-forming powders is the fly ash. Fly ash is a waste product of thermic coal plants, which produce electricity by coal burning. Fly ashes contain mostly Ca, Al, Si and Fe oxide mixtures and compounds formed during the burning process, followed by sedimentation. The standardization is made by SiO₂ content. Class C ash has low silica content (<50 wt.%) and class F ash has a higher silica content (>50 wt.%). The fly ash, studied in this work, was obtained from Kangal Coal Plant. The NaOH was used as the geopolymer binder and curing was performed at 80% relative humidity, at 40°C in sealed plastic molds. The obtained cylinders were aged for one week before releasing from molds. pH dependent degradation was used to determine the ionic exchange of geopolymers into the solution. Afterwards, XRD and SEM were done to detect the structural changes of geopolymers.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 379-381
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric studies of nano structured BaTi1-xSnxO3 solid solutions
Autorzy:
Bitra, H. Ch. R.
Prasad, B. B. V. S. V.
Powiązania:
https://bibliotekanauki.pl/articles/412300.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
BTSx
XRD
SEM
dielectric constant
Opis:
BaTi1-xSnxO3 (BTSx) ceramics had been prepared by temperature sintering technique. Initially, the samples were calcined at a temperature at 900 °C for 2 hours, after that ball milling was done and then the samples were sintered at a temperature of 1150 °C for 3 hours. X-ray diffractometry, Scanning Electron Microscopy, Energy Dispersive Spectroscopy and Dielectric measurements were carried out and structural, micro structural and elemental analyses were discussed in brief.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 191-201
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved photoresponse of porous silicon photodetectors by embedding CdS nanoparticles
Autorzy:
Abd, Ahmed N.
Powiązania:
https://bibliotekanauki.pl/articles/1193949.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdS
Nanoparticles
PSi
Photodetector
SEM
XRD
Opis:
In this research, the nanocrystalline porous silicon (PSi) films are prepared by electrochemical etching of p types silicon wafers with 15 mA/cm2 etching current densities and 15 min etching time on the formation nanosized pore array. PSi was characterized by the measurement of XRD, FTIR spectroscopy and atomic force microscopy properties (AFM). We have estimated crystallites size from X-Ray diffraction about nanoscale for PSi and Atomic Force microscopy confirms the nanometric size Chemical fictionalization during the electrochemical etching show on the surface chemical composition of PSi. The atomic force microscopy investigation shows the rough silicon surface. Also, it is reported the preparation of colloidal CdS nanoparticles NPs prepared by laser ablation in liquid (LAL) technique by irradiating with a Nd:YAG laser pulses CdS target immersed in methanol and varying the laser fluence 1.32 J/cm2. The structural, morphological and optical of CdS NPs has been studied. XRD measurement disclosed that the CdS NPs were of wurtzite hexagonal crystal structure. Transmission electron microscopy (TEM) investigation revealed that the synthesized CdS particles are spherical and have an average particle size in the range of (25 nm). AFM investigations showed that the produced CdS particles have ball-shape with good disposability. The energy band gap of CdS NPs prepared with 1.32 J/cm2 laser fluence has been determined from optical properties and found to be in the range (2.9 eV). Optical constants of CdS NPs were determined from transmittance and reflectance spectra.The effect of CdS NPs diffusion on properties of PSi Photodetector have reported which reveals that improving in (Al/PSi/Si/Al). The results show that a linear relationship between 1/C2 and reverse bias voltage was obtained. The built-in potential have values depending on the etching time current density and laser flunce. Al/CdSe/PSi/Si/Al photodetector hetrojunction have two peaks of response located at 415 nm and (700 -800nm) with max sensitivity 0.6 A/W. The maximum specific detectivity is 6.8×〖10〗^12 cm•〖Hz〗^(1/2) 〖•W〗^(-1) at 770 nm wavelength.
Źródło:
World Scientific News; 2015, 19; 32-49
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing effect on nickel oxide nanoparticles synthesized by sol-gel method
Autorzy:
Kavitha, B.
Nirmala, M.
Pavithra, A.
Powiązania:
https://bibliotekanauki.pl/articles/1189956.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Nickel Oxide nanoparticles
XRD
SEM
TGA-DTA
Opis:
NiO nanoparticles were synthesized by Sol-Gel method and the synthesized nanoparticles were annealed at different temperatures. The powders were investigated with x-ray diffraction, scanning electron microscopy and TGA. The structural characterization was carried out by x-ray diffraction which confirms the polycrystalline nature of the films with a cubic structure. SEM analysis of the films enabled the conclusion that the prepared films are uniform, rough, large crystals and agglomeration of particles were observed. The thermal stability of the sample was examined by TGA analysis which showed NiO nanoparticles formed between 130-720 C.
Źródło:
World Scientific News; 2016, 52; 118-129
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft Chemistry - Synthesis of Nano-Titanium-Doped-Tellerium-Cadmium for Solar Cell Applications
Autorzy:
Elsabawy, Khaled M.
Powiązania:
https://bibliotekanauki.pl/articles/1192983.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Sol-Gel
Hydrolysis
AFM
XRD
Microstructure
SEM
Opis:
Soft chemistry procedures through sol–gel technique has applied to synthesize nano- Ti-doped CdTe composite. Gels were synthesized by the hydrolysis of a complex solution of Si(OC2H5)4, Cd(CH3COO)2•2H2O, Ti(CH3COO)4 and Te were heated from 350 to 600 °C in a H2─N2 atmosphere to form fine cubic CdTe doped crystals. The size of CdTe crystals, determined from the line broadening of X-ray diffraction pattern, increases from 6 to 21 nm in diameter with increasing heat-treatment temperature. Micro-structural features of Ti-doped CdTe crystals were characterized by both of AFM and SEM investigations . The analysis of micro-structural micrographs of both of SEM and AFM indicated that titanium additions improved the crystal growth of grain towards more lower grain size which ranged in between 1.4-2.5 μm while 0.67 μm through Scherrer’s calculations.
Źródło:
World Scientific News; 2016, 36; 61-72
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of metals from printed circuit boards by means of electrostatic separation
Autorzy:
Franke, Dawid
Suponik, Tomasz
Nuckowski, Paweł M.
Gołombek, Klaudiusz
Hyra, Kamila
Powiązania:
https://bibliotekanauki.pl/articles/409724.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
electrostatic separation
metals recovery
PCB
SEM
XRD
Opis:
Without the use of appropriate recycling technologies, the growing amount of electronic waste in the world can be a threat to the development of new technologies, and in the case of improper waste management, may have a negative impact on the environment. This is due to the fact that this waste contains large amounts of valuable metals and toxic polymers. Therefore, it should be recycled in accordance with the assumptions of the circular economy. The methods of mechanical recovery of metals from electronic waste, including printed circuits, may be widely used in the future by waste management companies as well as metal production and processing companies. That is why, a well-known and easily applicable electrostatic separation (ES) method was used to recover metals from printed circuit boards. The grain class of 0.32 - 0.10 mm, obtained after grinding the boards, was fed to a separator. Feed and separation products were analyzed by means of ICP-AES, SEM/EDS and XRD. The concentrate yield obtained after electrostatic separation amounted to 32.3% of the feed. Its density was 11.1 g/cc. Out of the 91.44% elements identified in the concentrate, over 90% were metals. XRD, SEM observations and EDS analysis confirmed the presence of non-metallic materials in the concentrate. This relatively high content of impurities indicates the need to grind printed circuit board into grain classes smaller than 0.32-0.10 mm.
Źródło:
Management Systems in Production Engineering; 2020, 4 (28); 213-219
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and optical characteristics of silver nanoparticles on different substrates
Autorzy:
Budhiraja, N.
Sharma, A.
Dahiya, S.
Parmar, R.
Vidyadharan, V.
Powiązania:
https://bibliotekanauki.pl/articles/411878.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Nanoparticle
Crystallography
Topography
XRD
SEM
UV-VIS
Opis:
Silver nanoparticles have been deposited on glass and polyethylene substrate by Chemical Bath Deposition (CBD) technique and Chemical rolling method. A comparative study has shown that Chemical bath technique is superior compared to rolling technique for uniform deposition of silver nanoparticles on glass substrate. Crystallography investigation of these materials is done by X-ray diffraction (XRD) which reveals that average grain size is in nano region. Scanning Electron Microscope (SEM) is used for topography study of these prepared nanostructures. Optical properties of the synthesized materials are studied by UV-VIS in detail to check their potential for next era industrial revolution.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 14; 80-88
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Manganese Sulphide Thin Films by Chemical Bath Deposition Method
Autorzy:
Geetha, G.
Murugasen, P.
Sagadevan, S.
Powiązania:
https://bibliotekanauki.pl/articles/1030049.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
MnS thin films
XRD
SEM
dielectric studies
Opis:
Manganese sulphide (MnS) thin films were prepared by chemical bath deposition method. X-ray diffraction analysis was used to study the structure and the crystallite size of MnS thin films. The grain size and the surface morphology were studied using scanning electron microscopy. The optical properties were studied using the UV-visible absorption spectrum. The dielectric properties of MnS thin films were studied for different frequencies and different temperatures. Further, electronic properties, such as valence electron plasma energy, average energy gap or the Penn gap, the Fermi energy and electronic polarizability of the MnS thin films were calculated. The ac electrical conductivity study revealed that the conduction depended both on the frequency and the temperature. The temperature dependent conductivity study confirmed the semiconducting nature of the films.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1221-1226
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of ZnO thin film using sol-gel dip-coating technique and their characterization for optoelectronic applications
Autorzy:
Chaudhary, Preeti
Kumar, Vipin
Powiązania:
https://bibliotekanauki.pl/articles/1075562.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Band gap
SEM
XRD
ZnO
dip coating
Opis:
ZnO thin film with an aim to employ in opto-electronic applications was prepared using sol-gel dip-coating route and thereafter sintered at temperature 500 ºC. The film has been investigated by XRD pattern, SEM, UV-Vis and photoluminescence spectroscopy for physical and optical characterization of ZnO thin film. X-Ray diffraction pattern analysis reveals the polycrystalline nature with hexagonal wurtzite structure having orientation along the plane (002). Scanning electron micrograph shows symmetrical dense ZnO rod throughout the surface. The diffuse reflectance spectrum is studied in the range of wavelength 300-800 nm. A band gap of 3.21 eV is calculated using Kubelka-Munk function. PL spectrum shows strong peak at 380 nm due to oxygen vacancy of ZnO.
Źródło:
World Scientific News; 2019, 121; 59-66
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Microstructure and Phase Composition of Mortars from the 17th Century Sacred Buildings
Mikrostruktura i skład fazowy zapraw z XVII-wiecznych budowli sakralnych
Autorzy:
Owsiak, Zdzisława
Sobczyński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1833732.pdf
Data publikacji:
2020
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
mortar
microstructure
XRD
SEM
EDS
zaprawa
mikrostruktura
Opis:
This work aims to characterize the microstructure of mortars derived from the walls of sacred buildings from the 17th century. The tests were carried out using the X-ray diffraction method, differential thermal analysis and scanning microscopy combined with the analysis of the elemental composition in the micro area. The results of this study show that the materials bonding the elements of the wall in historic buildings are porous sand-lime mortars with an increased binder-to-aggregate ratio, also containing limestone crumbs, flints and feldspars, and fragments of bricks larger than sand particles. The binder is fully carbonated calcium hydroxide, with no pozzolanic additives. The results of the microstructure and phase composition tests of mortars used for bonding wall elements in buildings constructed at the end of the 16th and early 17th centuries can be used to select the composition of mortars used in the renovation and repair of historic buildings.
Celem pracy jest charakterystyka mikrostruktury zapraw pobranych z muru sakralnych budowli XVII-wiecznych. Badania wykonano metodą dyfrakcji rentgenowskiej, termicznej analizy różnicowej oraz mikroskopii skaningowej połączonej z analizą składu pierwiastkowego w mikroobszarze. Wyniki przeprowadzonych badań wykazały, że zaprawy łączące elementy muru w budowlach historycznych są porowatymi zaprawami wapienno-piaskowymi, o zwiększonym stosunku spoiwa do kruszywa, zawierają także w swoim składzie okruchy skał wapiennych, krzemieni i skaleni oraz fragmenty cegieł o większych rozmiarach niż ziarna piasku. Spoiwo stanowi w pełni skarbonatyzowany wodorotlenek wapnia, niezawierający dodatków pucolanowych. Wyniki badań mikrostruktury i składu fazowego zapraw stosowanych do spajania elementów muru w budowlach wznoszonych w końcu XVI i na początku XVII wieku mogą posłużyć do doboru składu zapraw stosowanych przy renowacji i naprawach budowli historycznych.
Źródło:
Structure and Environment; 2020, 12, 4; 153--158
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature-induced changes in the topography and morphology of C–nPd films deposited on fused silica
Autorzy:
Diduszko, R.
Kowalska, E.
Kozłowski, M.
Czerwosz, E.
Kamińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/174476.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
carbonaceous-palladium film
PVD
XRD
SEM
FTIR
Opis:
Changes in superficial and structural properties in carbonaceous–palladium (C–Pd) films prepared by PVD method, induced by annealing them in an inert atmosphere were studied. C–Pd films with different Pd content in a carbon matrix were investigated. SEM observation after heat treatment showed the agglomeration of palladium nanograins into bigger grains and significant changes in a topography and morphology of C–Pd films. XRD studies confirmed the formation of big (more than 100 nm in diameter) Pd nanograins as a result of the annealing process. FTIR studies showed that C–Pd films from PVD process contained fullerene C60 and palladium acetate (films precursors), which were decomposed during the annealing process.
Źródło:
Optica Applicata; 2013, 43, 1; 133-141
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Niskotemperaturowe starzenie cyrkonowych materiałów ceramicznych Y-TZP. Cz. 1. Badania mikrostruktury i przemian fazowych
Low-temperature degradation of Y-TZP zirconia ceramics. Part I: Microscopic observations and phase analysis
Autorzy:
Tymowicz-Grzyb, P.
Jaegermann, Z.
Konopka, G.
Wiśniewski, Z.
Pęczkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/168854.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
protetyka stomatologiczna
ceramika cyrkonowa
starzenie niskotemperaturowe
XRD
termowizja SEM
dental prosthetics
zirconia ceramics
low-temperature degradation
SEM thermovision
Opis:
Przedmiotem badań było zjawisko starzenia niskotemperaturowego materiałów cyrkonowych. Ma ono ogromny wpływ na funkcjonalność i trwałość elementów wykonanych z ceramiki cyrkonowej. Celem niniejszej pracy było zbadanie początkowych etapów procesu niskotemperaturowego starzenia materiałów cyrkonowych Y-TZP metodami analizy fazowej XRD oraz obserwacji mikroskopowych SEM. Badania fazowe przeprowadzone metodą dyfrakcji rentgenowskiej wykazały wzrost zawartości fazy jednoskośnej w badanych materiałach Y-TZP, co potwierdziło wystąpienie zjawiska starzenia hydrotermalnego. Zawartość fazy jednoskośnej ZrO2 w starzonych próbkach była proporcjonalna do czasu starzenia. Wyniki badań XRD zostały potwierdzone analizą obrazów mikroskopowych SEM.
The subject of the study was the phenomenon of low-temperature degradation (LTD) of Y-TZP zirconia ceramics. It has crucial impact on functionality and stability of zirconia elements. The aim of this work was to investigate the initial stages of LTD process of zirconia ceramics by means of phase analysis XRD and SEM microscopic observations. Phase analysis conducted by X-ray diffraction method showed that the content of monoclinic phase in samples after aging increased. The content of the monoclinic ZrO2 phase in aged samples was proportional to the aging time. XRD results have been confirmed by SEM image analysis.
Źródło:
Szkło i Ceramika; 2017, R. 68, nr 3, 3; 6-10
0039-8144
Pojawia się w:
Szkło i Ceramika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cobalt adsorption on the nano-hydroxyapatite matrix: isotherm and kinetic studies
Autorzy:
Narwade, V. N.
Khairnar, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/202076.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydroxyapatite
cobalt
adsorption
XRD
SEM
hydroksyapatyt
kobalt
adsorpcja
Opis:
Cobalt radionuclide is one of the prime contaminants generated during operation of pressurized heavy water. The paper reports the study of cobalt adsorption on hydroxyapatite (HAp) nanoceramic. A modified wet chemical precipitation method is used for HAp synthesis. The HAp nano-material is characterized by XRD, FTIR, TG/DTA, AFM, SEM, and EDAX. Experiments are performed in batches to observe the effect of cobalt adsorption on HAp matrix. The adsorption of cobalt on HAp is examined at room temperature. The isotherm and kinetic studies showed that the Freundlich isotherm and pseudo-second order model are the best choices to describe the nature of adsorption.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 131-137
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania meteorytu Odessa przy użyciu nowoczesnych technik inżynierii materiałowej
Meteorite Odessa investigations with use of modern techniques of materials engineering
Autorzy:
Ferdzyn, Justyna
Gołdyn, Paweł
Kędzierski, Łukasz
Radaszkiewicz, Anna
Sroczyńska, Aleksandra
Jędrzejczak-Gruszczyńska, Anna
Makówka, Marcin
Karczemska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1033079.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Odessa iron meteorite
Raman spectroscopy
SEM EDS
XRD
Opis:
Odessa iron meteorite was investigated with scanning electron microscopy (SEM), Raman spectroscopy and X-ray diffraction (XRD) techniques. The research has shown the existence of minerals such as schreibersite, troilite, taenite, kamacite, cohenite, graphite and diamond in the examined sample. Raman spectroscopy allowed to identify different allotropic forms of carbon, which is diamond and graphite with different levels of order.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2017, 8; 40-51
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 39

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