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Tytuł:
Analysis of Optimum Temperature and Calcination Time in the Production of CaO Using Seashells Waste as CaCO3 Source
Autorzy:
Dampang, Sarah
Purwanti, Endah
Destyorini, Fredina
Kurniawan, Setyo Budi
Abdullah, Siti Rozaimah Sheikh
Imron, Muhammad Fauzul
Powiązania:
https://bibliotekanauki.pl/articles/1838407.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
characterization
conversion
environment
FTIR
SEM-EDX
TGA
Opis:
Seashells waste is abundant in coastal area, especially in the locations where fisheries are a major occupation. This abundant resource of seashells opens a new opportunity further utilization. Seashells waste is a source of CaCO3, which may be converted into CaO via the calcination process. This study analyzed the characteristics of the CaO produced via calcination process at different temperature and calcination time. The calcination process was carried out at a temperature of 800°C, 900°C, and 1000°C with variation of 2, 3, and 4 hours in time. The Fourier transform infrared spectroscopy (FTIR) result showed that the spectrum of 2513 cm-1 as an indication of the C-H group containing CaO appearing after calcination. The FTIR results suggest that the calcination time did not gave major alteration to the functional groups. The results of X-ray diffraction (XRD) analysis showed that CaO laid at the angle of 58.1° and 64.6°. Scanning Electron Microscopy–Energy Dispersive X-Ray Spectroscopy (SEM-EDS) results showed that the most significant compositional outcome after the calcination process was Ca and O at all temperatures and calcination times. All calcined seashells showed rough surface and irregular shape particles. The result of a Thermogravimetric analysis (TGA) suggested that the highest mass alteration occurred at a temperature of 800°C with 78 mins of calcination time.
Źródło:
Journal of Ecological Engineering; 2021, 22, 5; 221-228
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and chemical mechanisms of hydrophobicity of nanoparticle membranes (Mg+Al2O3)
Autorzy:
Wahyudi, Wahyudi
Subagyo, R.
Gapsari, F.
Powiązania:
https://bibliotekanauki.pl/articles/368531.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
hydrophobic
superhydrophobic
hydrophilic
SEM-EDX
gas bubbles
nanoparticles
membranes
hydrofobowość
superhydrofobowość
hydrofilowość
pęcherze gazowe
nanocząstki
membrany
Opis:
Purpose: Investigate the hydrophobic, superhydrophobic and hydrophilic properties of Alumina (Al2O3) and Magnesium (Mg) nanoparticles. Design/methodology/approach: This research was conducted by SEM-EDX analysis of Magnesium and Alumina nanoparticles, observation of gas bubbles when droplets of water contact with membrane surfaces, measurement of surface roughness and detection of Hydrogen gas production using Gas Chromatography. There are eleven compositions (Al2O3:Mg) membranes used in this study, namely: (0:100; 10:90; 20:80; 30:70; 40:60; 50:50; 60:40; 70:30; 80:20; 90:10; and 100:0). Findings: Successfully found an alloy membrane between Alumina (Al2O3) and Magnesium (Mg) nanoparticles in the composition of Mg:Al2O3 (0:100%) having Hydrophobic properties; Mg:Al2O3 (50:50%) has Superhydrophobic properties and Mg:Al2O3 (100:0%) has hydrophilic properties. Three conditions occur when H2O droplets come in contact with the membrane layer, namely: hydrophobic conditions when the trapped gas pressure is smaller than the droplet pressure. Superhydrophobic conditions when the trapped gas pressure is equal to the droplet pressure. Hydrophilic conditions occur when the trapped gas pressure is greater than the droplet pressure. Research limitations/implications: This research is limited to the hydrophobic nature of Nano Alumina (Al2O3) and Magnesium (Mg) membrane particles. Practical implications: Superhydrophobic properties are very suitable to be applied to membranes that are useful for destiny. Originality/value: The novelty of this study is to find the right mixture of nanoparticles of Alumina and Magnesium in a composition that is capable of creating hydrophobic, superhydrophobic and hydrophilic properties.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 96, 2; 57-68
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza SEM czarnego tonera na wydrukach. Część II
SEM analysis of black toner on printouts. Part II
Autorzy:
Łasińska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1052550.pdf
Data publikacji:
2021-04-29
Wydawca:
Agencja Bezpieczeństwa Wewnętrznego
Tematy:
toner
brother
konica minolta
skaningowa mikroskopia elektronowa
mikroanaliza rentgenowska
sem/edx
scanning electron microscopy
x-ray
microanalysis
Opis:
Eksperci w zakresie badań dokumentów są często proszeni o określenie, czy wydruk pochodzi z określonej drukarki laserowej. Drukarkę rzadko można zidentyfikować, chyba że na wydruku są widoczne jej unikalne wady lub nieprawidłowości. W artykule przedstawiono możliwości identyfikacji i weryfikacji tonerów na wydrukach uzyskanych z różnych drukarek laserowych przy użyciu skaningowej mikroskopii elektronowej. W sumie 21 wydruków uzyskano z 21 różnych modeli maszyn drukujących Brother i Konica Minolta. Szesnaście wydruków uzyskano z drukarek, w których były oryginalne kasety z tonerem, a pięć z drukarek z zamiennikami. Ustalono jasne kryteria oceny indywidualnej. Na podstawie zdjęć SEM oraz tych kryteriów ujawniono szczegóły topografii struktury tonera. Na podstawie przeprowadzonych badań określono różnice lub podobieństwa tonerów na badanych wydrukach.
Document examiners are frequently asked to determine whether or not a printout originated from a particular laser printer. The printer can rarely be identified unless some unique defects or irregularities of the printing are present on the printout. This article presents an overview of a systematic approach to characterizing and discriminating the toner of different laser printers using scanning electron microscopy. A total of twenty-one collected printouts were printed on twenty-one different Brother and Konica Minolta printing machine models. Sixteen printouts were obtained using printers with original toner cartridges while five printouts were obtained using printers with compatible cartridges. Clear criteria were established for individual assessment. Based on the SEM images and established criteria the details of topography of the toner structure were revealed. Due to this tudy, the differences or similarities of toners on tested printouts were determined. The SEM technique can be successfully, simply, and rapidly applied to the analysis of toners on paper documents.
Źródło:
Przegląd Bezpieczeństwa Wewnętrznego; 2021, 13, 24; 221-249
2080-1335
2720-0841
Pojawia się w:
Przegląd Bezpieczeństwa Wewnętrznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of Natural Dyes on 18th Century Liturgical Textiles from Dubrovnik
Identyfikacja naturalnych barwnik w na XVIII-to wiecznych tekstyliach liturgicznych z Dubrownika
Autorzy:
Jemo, D.
Parac-Osterman, D.
Powiązania:
https://bibliotekanauki.pl/articles/231754.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
natural dyes
liturgical textile
UV/VIS
SEM-EDX
FTIR-ATR
HPLC
Dubrovnik
barwniki naturalne
szaty liturgiczne
chromatografia
Dubrownik
Opis:
In this paper researches were carried out on fragments of textiles from the 18th century from Dubrovnik, for which, based on the design and art-historical analysis, it was determined that it was a part of an object (pluvial, cope) from liturgical vestments (ecclesiastical textiles) of the Dubrovnik diocese. Using modern non-destructive and micro-destructive methods we conducted the identification of green, blue and red as the dominant tones on the artefacts of historical textiles from Dubrovnik. The identification was based on the application of modern complementary techniques: UV / VIS, HPLC, SEM-EDX and FTIR-ATR. We analysed samples of coloured fiber, as well as ones obtained by the extraction of dyes from the dyed fibers. Archival data on natural dyes used in the Dubrovnik region in the period 14-19th century was taken into account in the identification of the historical textile dyes.
W artykule opisano badania przeprowadzone na fragmentach XVIII-to wiecznych szat liturgicznych z Dubrownika. Stosując nowoczesne metody nieinwazyjne i mało niszczące przeprowadzono identyfikację zielonego, niebieskiego i czerwonego koloru, jako dominujących tonów na artefaktach tkanin historycznych. Identyfikacja oparta była na zastosowaniu nowoczesnych technik uzupełniających: UV/VIS, HPLC, SEM-EDX oraz FTIR-ATR. Analizowano próbki włókien dokonując ekstrakcji barwników. Wyniki badań porównano z archiwalnymi danymi dotyczącymi stosowania naturalnych barwników w regionie Dubrownika w okresie XIV-XIX wieku.
Źródło:
Fibres & Textiles in Eastern Europe; 2017, 1 (121); 113-120
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Powstawanie apatytu na elastycznym kompozycie kościozastępczym
Apatite formation on flexible bone substitute
Autorzy:
Borkowski, L.
Ginalska, G.
Ślósarczyk, A.
Paszkiewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/285812.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
bioaktywność
biokompatybilność
hydroksyapatyt węglanowy (CHAP)
kompozyt kościozastępczy
SBF
SEM-EDX
bioactivity
biocompatibility
bone substitutes
carbonated hydroxyapatite (CHAP)
simulated body fluid (SBF)
Opis:
Podstawowe cechy materiałów kościozastępczych takie jak bioaktywność i biokompatybilność, mogą być badane in vitro przy wykorzystaniu roztworu imitującego płyn tkankowy tzw. płyn SBF. Dwufazowy kompozyt, przeznaczony do wypełniania ubytków kostnych, został wykonany z granul hydroksyapatytu węglanowego i polimeru polisacharydowego. Biomateriał testowano pod kątem zdolności tworzenia warstwy apatytu w roztworze SBF przez okres 30 dni. Po tym czasie powierzchnię próbek i płyn po inkubacji, poddano analizie z wykorzystaniem SEM-EDX. Wykazano tworzenie warstwy apatytowej na powierzchni kompozytu kościozastępczego.
Biocompatibility and bioactivity, elementary characteristics of bone substitute materials, can be examined in vitro using solution that simulates body fluids. Two-phase composite, intended for filling bone defects, was made of carbonated hydroxyapatite granules and polysaccharide polymer. Biomaterial was tested whether it can form apatite layer during soaking in SBF solution for 30 days. After that time, the surface of composite samples and the fluid were analyzed using SEM-EDX. Our observations indicate the ability of a bone substitute biomaterial to form apatite layer on its surface.
Źródło:
Engineering of Biomaterials; 2011, 14, no. 106-108; 105-109
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray techniques in the investigation of a Gothic sculpture : the risen Christ
Autorzy:
Mikołajska, A.
Walczak, M.
Kaszowska, Z.
Urbańczyk-Zawadzka, M.
Powiązania:
https://bibliotekanauki.pl/articles/146866.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
cultural heritage
X-ray image
X-ray dual source computed tomography (DSCT)
scanning electron microscopy energy dispersed X-ray spectroscopy (SEM-EDX)
Opis:
For over a century, X-ray radiation has played an important role in the area of the conservation and restoration of cultural heritage objects. X-ray techniques are amongst the most fundamental and helpful methods used in the investigation of art works. This paper reviews the application of traditional radiography, X-ray dual source computed tomography (DSCT) and scanning electron microscopy combined with energy dispersed X-ray spectroscopy (SEM-EDX) to the investigation of a wooden, Gothic sculpture, The risen Christ. Thanks to the properties of X-ray radiation (different absorption by various materials) first two methods allow the assessment of the preservation state and the observation of the internal structure of an object in 3-D. While SEM-EDX analysis permits the elemental analysis of the polychrome layers. As a result 2-D and 3-D images, permitting the full volume inspection of an object, were taken in a totally non-destructive way. The morphological and physical information about the inner structure of the investigated wooden sculpture was obtained, revealing changes related to previous restorations, as well as ageing effects. Employing the SEM-EDX, painting materials (pigments and filers), were identified. Gained data is essential for restorers to understand the whole structure of the studied object and to decide which further investigation and restoration steps have to be undertaken.
Źródło:
Nukleonika; 2012, 57, 4; 627-631
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure, SDAS and Mechanical Properties of A356 alloy Castings Made in Sand and Granulated Blast Furnace Slag Moulds
Autorzy:
Jinugu, B. R.
Inampudi, N. M.
Powiązania:
https://bibliotekanauki.pl/articles/379468.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silica sand
slag
CO2 process
casting aluminium alloys
SEM-EDX
mechanical properties
piasek kwarcowy
żużel
proces CO2
odlew ze stopów aluminium
właściwości mechaniczne
Opis:
Investigations were carried out to ensure the granulated blast furnace (GBF) slag as an alternative mould material in foundry industry by assessing the cast products structure property correlations. Sodium silicate-CO2 process was adopted for preparing the moulds. Three types of moulds were made with slag, silica sand individually and combination of these two with 10% sodium silicate and 20 seconds CO2 gassing time. A356 alloy castings were performed on these newly developed slag moulds. The cast products were investigated for its metallography and mechanical properties. Results reveal that cast products with good surface finish and without any defects were produced. Faster heat transfers in slag moulds enabled the cast products with fine and refined grain structured; and also lower Secondary Dendrite Arm Spacing (SDAS) values were observed than sand mould. Slag mould casting shows improved mechanical properties like hardness, compression, tensile and impact strength compared to sand mould castings. Two types of tensile fracture modes, namely cleavage pattern with flat surfaces representing Al−Si eutectic zone and the areas of broken Fe-rich intermetallic compounds which appear as flower-like morphology was observed in sand mould castings. In contrast, GBF slag mould castings exhibit majority in dimple fracture morphology with traces of cleavage fracture. Charpy impact fractured surfaces of sand mould castings shows both transgranular and intergranular fracture modes. Only intergranular fracture mode was noticed in both GBF slag and mixed mould castings.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 179-191
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania policjantów oraz pojazdów służbowych w kierunku możliwej kontaminacji pozostałościami powystrzałowymi
Study of possible contamination of police officers and service vehicles with gunshot residues
Autorzy:
Dmitruk, Wiktor
Powiązania:
https://bibliotekanauki.pl/articles/2067394.pdf
Data publikacji:
2018
Wydawca:
Centralne Laboratorium Kryminalistyczne Policji
Tematy:
cząstki GSR
O-GSR
kontaminacja GSR
dłonie policjantów
kanapy radiowozów
SEM/EDX
GC/MS
GSR particles
GSR contamination
police officers hands
backseats of service vehicles
Opis:
W artykule przedstawiono analizę danych literaturowych oraz wyniki badań mikrośladów zabezpieczonych na stoliki mikroskopowe z dłoni 59 policjantów, a także mikrośladów pobranych z 38 kanap radiowozów na ładunki ELAVAK. Stoliki przebadano pod kątem obecności cząstek GSR, natomiast filtry ładunków analizowano pod kątem obecności O-GSR oraz innych substancji chemicznych. Mikroślady zabezpieczono w siedmiu rejonowych komendach Policji garnizonu stołecznego. Badania przeprowadzono dwoma technikami analitycznymi: SEM/EDX i GC/MS. Na dłoniach 18% funkcjonariuszy stwierdzono charakterystyczne cząstki GSR w liczbie od 1 do 27 sztuk, a na powierzchniach 24% kanap ujawniono od 1 do 11 takich cząstek. W przypadku 13 pojazdów na kanapach ujawniono ślady difenyloaminy – substancji chemicznej wykorzystywanej jako stabilizator w prochach bezdymnych, w trzech ślady kokainy, a w jednym THC.
The hereby article presents the analysis of data from literature of the subject, as well as of analyses of material recovered onto microscope stubs from hands of 59 police officers and traces collected from 38 police cars backseats onto ELEVAK instrument cartridges. The stubs were checked for presence of GSR particles and the filters of ELEVAK cartridges – for O-GSR and other substances. Traces were recovered at seven district police stations within Warsaw Municipal area. The analyses were performed with two analytical techniques: SEM/EDX and GC/MS. From 1 to 27 characteristic GSR particles were found on hands of 18% officers. Between 1 and 11 of such particles were detected on the surfaces of 24% car backseats. Traces of diphenylamine, a chemical substance used as a stabiliser in smokeless powders were detected in 13 vehicles, cocaine traces were found in 3 vehicles and THC was found in one vehicle.
Źródło:
Problemy Kryminalistyki; 2018, 302; 11-20
0552-2153
Pojawia się w:
Problemy Kryminalistyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STEM-EDX and FIB-SEM Tomography of ALLVAC 718Plus Superalloy
Autorzy:
Kruk, A.
Cempura, G.
Lech, S.
Czyrska-Filemonowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/354670.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TEM
SEM
STEM-EDX tomography
FIB-SEM tomography
Allvac 718Plus
Opis:
Allvac 718Plus (718Plus) is a high strength, corrosion resistant nickel- based superalloy used for application in power generation, aeronautics and aerospace industry. The 718Plus microstructure consists of a γ matrix with γ’-Ni3(Al,Ti) and some δ- Ni3Nb phases as well as lamellar particles (η-Ni3Ti, η*-Ni6AlNb or Ni6(Al,Ti)Nb) precipitated at the grain boundaries. The primary strengthening mechanism for this alloy is a precipitation hardening, therefore size and distribution of precipitates are critical for the performance of the alloy. The aim of this study was to characterize precipitates in the 718Plus superalloy using Scanning Transmission Electron Microscope combined with Energy Dispersive X-ray Spectroscopy (STEM-EDX) and Focused Ion Beam Scanning Electron Microscope (FIB-SEM). The STEM-EDX and FIB-SEM tomography techniques were used for 3D imaging and metrology of the precipitates. Transmission electron microscopy and EDX spectroscopy were used to reveal details of the 718Plus microstructure and allow determine chemical composition of the phases. The study showed that electron tomography techniques permit to obtain complementary information about microstructural features (precipitates size, shape and their 3D distribution) in the reconstructed volume with comparison to conventional particle analysis methods, e.g. quantitative TEM and SEM metallography.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 535-542
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Boric Acid by Surface Oxidation of Amorphous Boron Powder: Characterization and Quantitative Estimation
Autorzy:
Nandi, A. K.
Ghosh, M.
Newale, S. P.
Jadhav, A. J.
Prasanth, H.
Pandey, R. K.
Powiązania:
https://bibliotekanauki.pl/articles/358160.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
amorphous boron powder
B2O3
boric acid
FTIR
SEM
EDX
Opis:
Amorphous Boron Powder (ABP) is used as a fuel in air breathing propulsion systems due to its high gravimetric and volumetric heat value. ABP is sensitive to air and undergoes slow oxidation during storage and handling, leading to the formation of a boric acid layer on the particle surface. This paper describes an analytical method for the estimation of boric acid in ABP. In-house samples obtained from the pilot plant of this laboratory, as well as commercial samples, were assayed for their boric acid content. The study is substantiated by characterization of the ABP samples by SEM with EDX and FTIR. The ageing characteristics of in-house boron powder was also studied.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 4; 387-398
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł

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