Wyniki wyszukiwania - BazTech

1

Effect of Calcination Temperature on the Stability of the Perovskite Materials – Study of Structural and Morphological Properties

Maou Amina, Gouitaa Najwa, Lamcharfi Taj Dine, Kandri Noureddine Idrissi

Ecological Engineering & Environmental Technology

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2023

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Vol. 24, iss. 8

1--8

EN

In this research, the solid-state method was utilized to synthesize LaFeO3 powders, with La2O3 and Fe2O3 being employed as precursor materials. The prepared samples were calcined at different temperatures 800°C, 900°C, 1000°C, 1100°C, 1200°C and 1300°C for 4h to study phase stability. The thermal effect on structural and morphological properties was reported. The X-ray diffraction results confirmed the pure phase in its orthorhombic configuration at 1200°C and 1300°C, which was confirmed by Rietveld’s analysis. Scanning electron microscopy coupled with Energy-dispersive X-ray spectroscopy was employed to analyze the surface morphology and compositional characteristics. In addition, the samples were analyzed by Fourier Transform Infrared Spectroscopy. The thermal behavior of the product was investigated through the utilization of thermogravimetric analysis.

2

Zastosowanie analizy termograwimetrycznej w recyklingu odpadów gumowych

Rodak Agata, Formela Krzysztof

Laboratorium - Przegląd Ogólnopolski

|

2022

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nr 4

20--24

PL

Rozdrabnianie odpadów gumowych stanowi podstawową metodę ich recyklingu, a otrzymane granulaty gumowe znajdują zastosowanie w modyfikacji polimerów, asfaltów czy cementów. Komercyjnie dostępne granulaty gumowe charakteryzowane są głównie przez analizę sitową informującą o rozkładzie i średniej wielkości cząstek gumy. Brakuje natomiast informacji na temat składu przetwarzanych odpadów gumowych, co znacząco ogranicza dalszy rozwój technologii ich recyklingu oraz upcyklingu gumy. W artykule omówiono możliwości zastosowania analizy termograwimetrycznej w kontroli jakości odpadów gumowych, która dostarcza informacji na temat składu oraz stabilności termicznej przetwarzanych odpadów gumowych. Ponadto w pracy przedstawiono również wyniki badań własnych z wykorzystaniem omawianej techniki w ocenie właściwości produktów recyklingu zużytych opon samochodowych.

EN

Shredding of rubber waste is the main method of its recycling, and the obtained rubber granules are used to modify polymers, asphalts or cements. Commercially available rubber granules are mainly characterised by sieve analysis, which provides information on the distribution and average size of rubber particles. However, there is no information on the composition of processed rubber waste, which significantly limits the further development of rubber recycling and upcycling technologies. The article discusses the possibility of using thermogravimetric analysis in rubber waste quality control, which provides information on the composition and thermal stability of processed rubber waste. In addition, we presents the results of our own research, in which we used the discussed technique to evaluate the properties of products made from recycled waste tyres.

3

Analiza termograwimetryczna materiałów gumowych w praktyce laboratoryjnej

Wróbel Justyna, Domańska Agata

Laboratorium - Przegląd Ogólnopolski

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2022

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nr specjalny

15--23

PL

W artykule omówiono wykorzystanie analizy termograwimetrycznej do badania składu ilościowego gumy oraz przedstawiono prace związane z wprowadzeniem do praktyki laboratoryjnej w Laboratorium Badawczym "LABGUM" w Łukasiewicz - Instytucie Inżynierii Materiałów Polimerowych i Barwników nowo zakupionego analizatora termograwimetrycznego.

4

The effect of kenaf loading on kenaf/ABS composites structure and thermal properties

Mashelmie S., Rabiatul Manisah M., Bahiyah Baba N., Mohd A.

Journal of Achievements in Materials and Manufacturing Engineering

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2022

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Vol. 111, nr 2

49--56

EN

Purpose: Many manufacturers have recently become interested in using fiber-reinforced polymer composites (FRPs) in structural applications. Synthetic fibres, such as carbon and glass fibres, have been commercialised internationally for decades, but they cause environmental issues because synthetic fibres are non-biodegradable and difficult to recycle once they have served their purpose, potentially polluting the environment. Thus, natural fibre composites like kenaf is a possible replacement for synthetic fibre due to their superior physical and mechanical properties. Kenaf appears to be the best candidate for replacing synthetic fibres in order to accomplish the goal of environmental preservation while also displaying excellent properties such as equivalent specific strength, low density, and renewable resources. Design/methodology/approach: The kenaf fiber was treated in KOH and added to ABS matrix to produce new composites at different loading (10, 15, 20 and 25 wt.%) by using Two Roll Mill machine. The influence of the fiber on the composites properties was evaluated. The produced material was subjected to SEM, MFI, TGA and DSC analysis. Findings: The incorporation of the treated kenaf fiber has an influence on the properties of kenaf/ABS composites. The addition of 10 wt.% kenaf was found to be the best loading with MFI value, initial degradation temperature and glass transition temperature at 0.8208 g/10 min, 322.63°C and 130°C respectively. The fiber was well dispersed in the matrix and shown good adhesion to the ABS. The addition of treated fiber contribute to a reduction in the MFI, improved the thermal stability of the composites and typical effects of Tg of the composite compare to pure ABS. Research limitations/implications: The results suggest the need to continue the study in order to further analyse higher kenaf loading and shed more light on the properties of the composites to improve understanding of kenaf/ABS composites. Originality/value: Obtained results are a solution to alternative of synthetic fibers, which may contribute to the sustainable development of composites materials industry through the utilization of kenaf fiber with ABS matrix.

5

In situ methanolic solvent synthesis, spectroscopic and thermogravimetric characterizations of three new transition metal complexes of trimethoprim drug

Refat Moamen S., Al-Humaidi Jehan Y., El-Sayed Mohamed Y., Hassan Reham F.

Polish Journal of Chemical Technology

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2021

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Vol. 23, nr 1

60--67

EN

Trimethoprim drug (TMP) complexes of copper (II), cobalt (II), and nickel (II) were prepared and discussed by using elemental analysis (C, H, N analysis), magnetic, molar conductance, FTIR, Raman spectroscopy, electron spin resonance (ESR) and UV-vis spectroscopy analyses. TMP drug coordinated as a tridentate ligand towards the respected three metal ions through two nitrogen atoms of amino groups and nitrogen atom of pyrimidine ring which flanked between –NH2 groups, these assignments confirmed by spectroscopic, magnetic, ESR and thermogravimetric analyses with formulas [Cu(TMP)(H2O)3]Cl2, [Co(TMP)(H2O)3]Cl2 and [Ni(TMP) (H2O)]Cl2. Copper (II) and cobalt (II) complexes have an octahedral geometrical structure included one TMP molecule, three coordinated water molecules and two uncoordinated chlorine atoms while, nickel(II)–TMP complex has a tetrahedral geometric configuration that involved one TMP molecule, one coordinated water molecule and two uncoordinated chlorine atoms. The activation energies and other kinetic thermodynamic parameters were estimated based on the employed of the Coats-Redfern and Horowitz-Metzger equations. The nano–structured form of the synthesized TMP complexes was confirmed dependent on the transmission electron microscopy (TEM).

6

Analiza termograwimetryczna materiałów gumowych w praktyce laboratoryjnej

Wróbel Justyna, Domańska Agata

Laboratorium - Przegląd Ogólnopolski

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2021

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nr 2

15--25

PL

W artykule omówiono wykorzystanie analizy termograwimetrycznej do badania składu ilościowego gumy oraz przedstawiono prace związane z wprowadzeniem do praktyki laboratoryjnej w Laboratorium Badawczym „LABGUM” w Łukasiewicz - Instytucie Inżynierii Materiałów Polimerowych i Barwników nowo zakupionego analizatora termograwimetrycznego. Dokonano oceny poprawności wskazań, jak również przeprowadzono niezbędne czynności związane z dostosowaniem nowego sprzętu do wymogów akredytacyjnych. Na podstawie uzyskanych wyników badań zaprezentowano zastosowanie analizatora termograwimetrycznego w oznaczaniu zawartości podstawowych grup składników gumy w kauczukach, mieszankach kauczukowych oraz wyrobach gumowych.

EN

The article discusses the use of thermogravimetric analysis to test the quantitative composition of rubber and presents the work related to the introduction of a newly purchased thermogravimetric analyser to the laboratory practice at the „LABGUM” Research Laboratory at the Łukasiewicz Research Network - Institute for Engineering of Polymer Materials and Dyes. The correctness of indications was assessed and the necessary operations related to the adaptation of the new equipment to the accreditation requirements were carried out. On the basis of the obtained research results, the use of the thermogravimetric analyser in determining the content of the basic groups of rubber components in rubbers, rubber mixtures and rubber products is presented.

7

Wyznaczanie składu nieznanej mieszaniny trójskładnikowej metodą TGA

Dennenwaldt Teresa

LAB Laboratoria, Aparatura, Badania

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2021

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R. 26, nr 2

35--37

PL

Oznaczanie ilościowe składu związku metodą analizy termograwimetrycznej (TGA) jest trudne, gdy poszczególne etapy rozkładu nakładają się na siebie. Jeżeli rozkład pojedynczych składników nie wpływa na proces rozkładu pozostałych składników, skład mieszaniny można obliczyć na podstawie zachowania poszczególnych składników podczas rozkładu. W tym artykule zaprezentowano sposób przeprowadzenia takiej analizy na przykładowej próbce mieszaniny trójskładnikowej siarczanu baru, sadzy i lignosulfonianu.

8

Identyfikacja polimerów termoplastycznych: analiza rozkładu metodą TGA

Dandekar Santosh

LAB Laboratoria, Aparatura, Badania

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2021

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R. 26, nr 2

31--34

PL

Pomiary metodą TGA wykonano na 22 różnych polimerach z użyciem dwóch różnych programów temperaturowych. Oznaczono zawartość składników lotnych (w większości przypadków: wody), ubytek masy i temperaturę reakcji pirolizy, zawartość sadzy wytworzonej w procesie pirolizy oraz zawartość popiołu. W artykule przedstawiamy różnice tych wielkości dla poszczególnych polimerów poddanych analizie. Omawiamy również sposób, w jaki wielkości wyznaczone na podstawie pomiarów TGA można wykorzystać do identyfikacji składu materiałów polimerowych.

9

Halloysite intercalated by potassium acetate

Mariusz Adamczyk, Katarzyna Małycha, Karol Kułacz, Michał Pocheć, Kazimierz Orzechowski

Physicochemical Problems of Mineral Processing

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2020

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Vol. 56, iss. 6

235--243

EN

Halloysite was intercalated by the mechanochemical technique from dry components. The process efficiency of 50% was achieved. The obtained intercalate differed from the material acquired using an aqueous solution of potassium acetate. The material was analyzed employing electron microscopy, thermogravimetry, X-ray powder diffraction, and dielectric spectroscopy. It was found that the molecules and/or ions present in the interlayer spaces retain some possibility of movement. This property of the material is promising for potential application as low expensive absorbers of electromagnetic radiation.

10

Polypropylene matrix composite with charcoal filler

Polok-Rubiniec M., Włodarczyk-Fligier A.

Journal of Achievements in Materials and Manufacturing Engineering

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2020

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Vol. 103, nr 2

60--66

EN

Purpose: The aim of the article is to present the thermal, electrical and mechanical properties of the produced polymer composites with a filler in the form of charcoal powder. Design/methodology/approach: The tests were carried out on samples of pure polypropylene (PP) and polymer composites, the matrix of which is polypropylene (PP), and the filler was charcoal powder with a volume fraction of 10%, 20%, 30%, 40% and 50%. The tested polymer composites in the form of granules were produced by extrusion, and then standardised test profiles were made by injection moulding. Findings: The hardness of the tested composites was determined by the Shore D method, the grain size distribution of the filler used was determined using the laser method and its thermal stability was tested using the TGA thermogravimetric analysis. The volume and surface resistivity were also determined and the density was determined. It was found that the charcoal powder used as a filler is characterised by high thermal stability - up to 600°C - and with an increase in its volume share in the polymer matrix, the hardness and density of the produced composites increases. Practical implications: The tested composites can be used as structural composites for complex elements requiring high hardness and strength. Originality/value: The research results indicate the possibility of using charcoal as a filler in polymer matrix, which, due to its low production cost, may be an alternative to expensive carbon fillers.

11

A study on alkali resistant glass fibre concrete and its exposure to elevated temperatures

Hussain S., Yadav J. S.

Journal of Achievements in Materials and Manufacturing Engineering

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2020

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Vol. 103, nr 1

5--15

EN

Purpose: Cement concrete is characterized as brittle in nature, the loading capacity of which is completely lost once failure is initiated. This characteristic, which limits the application of the material, can in one way be overcome by the addition of some small amount of short randomly distributed fibers (steel, glass, synthetic). Design/methodology/approach: The present study deals with the inclusion of alkali resistant glass fibers in concrete by percentage weight of cement. The mechanical properties such as compressive strength and split tensile strength have been studied after exposing the concrete samples to elevated temperatures of up to 500°C. Water binder ratios of 0.4, 0.45, 0.5, 0.55 and 0.6 have been used to prepare design mix proportions of concrete to achieve a characteristic strength of 30 MPa. The depth of carbonation post elevated temperature exposure has been measured by subjecting the concrete samples to an accelerated carbonation (5%) condition in a controlled chamber. Findings: Conclusions have been drawn in accordance to the effect of fiber replacement and temperature increment. The concrete mixes with fiber content of 1% by weight of cement had shown better strength in compression and tension compared to the other dosages and conventional concrete (without fiber). Microcracking due to internal stream pressure reduced the mechanical strengths of concrete at elevated temperatures. Also, from TGA it was observed that the amount of calcium carbonate in samples with fiber added, post carbonation was less than the mixes without fiber in it. Research limitations/implications: The present study has been limited to alkali resistant glass fibers as the conventional glass fibers undergo corrosion due to hydration. Practical implications: The glass fiber reinforced concrete can be used in the building renovation works, water and drainage works, b ridge and tunnel lining panels etc. Originality/value: Based upon the available literature, very seldom the studies are addressing the behaviour of alkali resistant glass fiber concrete and its exposure to elevated temperatures.

12

Soot contamination of engine oil - the case of a small turbocharged spark-ignition engine

Kozak Miłosław, Siejka Piotr

Combustion Engines

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2020

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R. 59, nr 3

28--32

EN

The paper presents the results of thermogravimetric tests of engine oil used in a small turbocharged spark-ignition engine. The main observation from the research was a significant soot contamination of engine oil, that appears even at its low mileage. This indicates that also in the case of port fuel injection spark-ignition engine, high particulate matter emissions may occur. A rapid soot contamination of the oil in this engine indicates that the oil change interval should be shortened.

13

Termiczny rozkład wielomateriałowych odpadowych opakowań po produktach farmaceutycznych

Klejnowska Katarzyna, Pikoń Krzysztof, Ścierski Waldemar, Zajączkowski Andrzej

Przemysł Chemiczny

|

2019

|

T. 98, nr 9

1414--1416

PL

Odpady wielomateriałowe stanowią ok. 1,6% całkowitej masy opakowań wprowadzanych na rynek. Wielomateriałowe opakowania po produktach farmaceutycznych (tzw. blistry) stanowią znaczną ilość odpadów medycznych, które, traktowane jako niebezpieczne, kierowane są obecnie do spalarni. Pomimo że jest to znaczna grupa odpadów, w dalszym ciągu nie opracowano zrównoważonej metody przetwarzania ich z odzyskiem frakcji metalicznej, która spełniałaby założenia gospodarki obiegu zamkniętego. Przedstawiono przegląd literatury dotyczącej zagospodarowania odpadów wielomateriałowych ze szczególnym naciskiem położonym na opakowania po produktach farmaceutycznych. Przedstawiono metodologię pomiarową, wyniki przeprowadzonych analiz termograwimetrycznych oraz krzywe TG i DTG odpadu pre- oraz postkonsumenckiego.

EN

Two types of wasted plastics and Al-contg. multi-material pharmaceutical packages (pre- and post-consumer) were analyzed by thermogravimetric method carried out under Ar at up to 700°C. The total mass losses were 68.27% and 58.43% for pre- and post-consumer waste, resp. A single thermal decompn. reaction was obsd. at 330°C for preconsumer waste and two reactions were obsd. at 312°C and 328°C for post-consumer waste. Sepn. of the materials for thermal processing was not necessary.

14

Termograwimetria i analiza gazowa. Cz. 5, TGA-mikro GC/MS

Fedelich Nicolas

LAB Laboratoria, Aparatura, Badania

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2019

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R. 24, nr 4

28--32

PL

W poprzednich artykułach tej serii poświęconych termograwimetrii i analizie uwolnionych gazów, omówiliśmy analizę termograwimetryczną (TGA) sprzężoną on-line ze spektroskopią w podczerwieni z transformacją Fouriera (FTIR), spektrometrią masową (MS) oraz chromatografią gazową z detektorem MS (GC/MS). W niniejszym artykule, ostatnim w tej serii, omówimy analizę TGA sprzężoną z mikrochromatografią gazową (mikro GC) opcjonalnie wyposażoną w spektrometr masowy.

15

Badanie efektów cieplnych analizatorem TGA/DSC

Hammer Angela

LAB Laboratoria, Aparatura, Badania

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2019

|

R. 24, nr 6

22--24

16

Investigation on fire potential of ventilation ducts

Jha Ankit, Amar Vinod, Tukkaraja Purushotham

Journal of Sustainable Mining

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2019

|

Vol. 18, iss. 4

270--276

EN

Fires in underground mines can create dangerous conditions for personnel and cause severe damage to property. Because of the confined nature of the underground environment, these effects can escalate rapidly. In underground mines, air ducts/bags are used for ventilating narrow blind headings; these consist of combustible materials that have not been investigated thoroughly in terms of their fire potential and gas emissions. The primary objective of this study is to investigate the fire potential and emission factors for these ducts. A preliminary investigation was performed using differential scanning calorimetry and thermogravimetric analysis. These tests provide crucial information for duct samples including the melting point which is used for designing a novel experimental setup for combustion analysis. This setup was used to perform a combustion experiment at 350 °C, so that all specimens can achieve complete combustion. Furthermore, the heat release rate and emission factors were calculated; it was observed that heat release rate for all the specimens was identical because of similar oxygen consumption during the experiment. Sample B has the lowest emission factor among the four samples (A, B, C, D) tested in this study.

17

A comparison of thermogravimetric characteristics of fresh and used engine oils

Kozak Miłosław

Combustion Engines

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2019

|

R. 58, nr 3

289--292

EN

The requirements set for engine oils are nowadays very high, varied, often contradictory and significantly go beyond the classic functions of engine oils. Also for the testing of engine oils, many different and advanced research methods are currently used. This article describes tests of fresh and used oil from a diesel engine using thermogravimetric analysis. This method was also used to determine the soot content of the used oil. The tests showed that the thermograms of fresh and used oil are similar, however in the oil used in the diesel engine the soot content increases.

18

Wykorzystanie technik analitycznych do oceny emisji lotnych związków organicznych uwalnianych z materiałów polimerowych, jako obiecujące rozwiązania w kontroli ich jakości. Cz. 1

Marć Mariusz, Namieśnik Jacek, Haponiuk Józef, Formela Krzysztof

Analityka : nauka i praktyka

|

2019

|

nr 2

47--51

PL

W celu uzyskania danych na temat charakterystyki morfologicznej i właściwości fizykochemicznych danego przedmiotu wykonanego z tworzyw sztucznych (lub gumy) powszechnie wykorzystywane są takie techniki, jak: spektroskopia w podczerwieni, różnicowa kalorymetria skaningowa, analiza termograwimetryczna, analiza dynamicznych właściwości mechanicznych, chromatografia żelowa czy skaningowa mikroskopia elektronowa.

19

Thermal decomposition characterization of supergene potassium-jarosite and sodium-jarosite minerals from the northern Tibetan Plateau, China

Chen L.

Physicochemical Problems of Mineral Processing

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2018

|

Vol. 54, iss. 2

459--466

EN

The thermal decomposition of supergene potassium-jarosite and sodium-jarosite samples from the weathering profiles of sulfide deposits in the northern Tibetan Plateau, China, was investigated. Electron microprobe, scanning electron microscopy, and X-ray diffraction analyses indicated the presence of nearly pure potassium-jarosite and sodium-jarosite. Thermogravimetric analysis of the potassium-jarosite sample revealed mass losses of 11.39 wt% at 443.0 °C, 20.99 wt% at 688.3 °C, and 3.18 wt% at 779.3 °C. The thermogravimetric analysis of sodium-jarosite revealed mass losses of 11.72 wt% at 447.5 °C, 21.32 wt% at 682.6 °C, and 3.70 wt% at 716.5 °C. The results provide no evidence for water-molecule loss below 400 °C, as has been reported previously for natural potassium-jarosite and sodium-jarosite. Thermal-decomposition mechanisms have been proposed for potassium-jarosite and sodium-jarosite based on X-ray diffraction analyses of samples obtained at distinct points along the respective thermal decomposition processes. A comparison of the thermal analysis patterns of potassium-jarosite and sodium-jarosite indicates that sodium-jarosite undergoes the initiation of lattice destruction at a higher temperature.

20

Termograwimetryczna analiza żywności - przegląd zastosowań

Witek M.

Laboratorium - Przegląd Ogólnopolski

|

2018

|

nr 4

37--41

PL

Artykuł przedstawia krótki przegląd literatury dotyczącej zastosowań analizy termograwimetrycznej (TGA) w badaniu żywności. Opisano także zasadę pomiaru, wykorzystywaną aparaturę, sposób prezentacji wyników otrzymanych w tej metodzie.

EN

The article presents a short review of the literature on thermogravimetric analysis (TGA) applications in food testing. The principle of measurement, the devices used and the presentation of the results obtained in this method are also described.