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Wyszukujesz frazę "thermogravimetric study" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Thermogravimetric Study of the Decomposition of BSA-Coated Magnetic Nanoparticles
    Autorzy:
    Csach, K.
    Juríková, A.
    Miškuf, J.
    Koneracká, M.
    Závišová, V.
    Kubovčíková, M.
    Kopčanský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1429064.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.65.Cb
    65.80.-g
    Opis:
    Magnetic nanoparticles used in biomedicine have to be biocompatible, which can be achieved by the modification of the magnetic particle surface with an appropriate biocompatible substance. In the work protein bovine serum albumin (BSA) was chosen to modify the surface of magnetic nanoparticles. The BSA-coated magnetic nanoparticles with different input weight ratios of BSA to the magnetite $Fe_3O_4$ were prepared and thermally characterized using thermogravimetric and differential scanning calorimetric analysis. The adsorption of BSA on the magnetic nanoparticles in wide range of concentration was confirmed. The activation energies of the thermal decomposition of the complex system were estimated.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1293-1295
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Textural, surface, thermal and sorption properties of the functionalized activated carbons and carbon nanotubes
    Autorzy:
    Nowicki, P.
    Szymanowski, W.
    Pietrzak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/779561.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    carbonaceous adsorbents
    oxidation
    nitrogenation
    surface functional groups
    thermogravimetric study
    adsorption from liquid phase
    Opis:
    Two series of functionalised carbonaceous adsorbents were prepared by means of oxidation and nitrogenation of commercially available activated carbon and multi-walled carbon nanotubes. The effect of nitrogen and oxygen incorporation on the textural, surface, thermal and sorption properties of the adsorbents prepared was tested. The materials were characterized by elemental analysis, low-temperature nitrogen sorption, thermogravimetric study and determination of the surface oxygen groups content. Sorptive properties of the materials obtained were characterized by the adsorption of methylene and alkali blue 6B as well as copper(II) ions. The final products were nitrogen- and oxygen-enriched mesoporous adsorbents of medium-developed surface area, showing highly diverse N and O-heteroatom contents and acidic-basic character of the surface. The results obtained in our study have proved that through a suitable choice of the modification procedure of commercial adsorbents it is possible to produce materials with high sorption capacity towards organic dyes as well as copper(II) ions.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 120-127
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on the Synthesis of Lithium Carbonate (Li2CO3) from Waste Acidic Sludge
    Autorzy:
    Choi, Dong Hyeon
    Wang, Jei-Pil
    Powiązania:
    https://bibliotekanauki.pl/articles/351124.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lithium carbonate
    thermogravimetric apparatus
    lithium sulfate
    carbon dioxide
    Opis:
    In this study, the synthesis of lithium carbonate (Li2 CO3 ) powder was conducted by a carbonation process using carbon dioxide gas (CO2 ) from waste acidic sludge based on sulfuric acid (H2 SO4 ) containing around 2 wt.% lithium content. Lithium sulfate (Li2 SO4 ) powder as a raw material was reacted with CO2 gas using a thermogravimetric apparatus to measure carbonation conditions such as temperature, time and CO2 content. It was noted that carbonation occurred at a temperature range of 800°C to 900°C within 2 hours. To prevent further oxidation during carbonation, calcium sulfate (CaO4 S) was first introduced to mixing gases with CO2 and Ar and then led to meet in the chamber. The lithium carbonate obtained was examined by inductively coupled plasma–mass spectroscopy (ICP-MS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) and it was found that of lithium carbonate with a purity above 99% was recovered.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1351-1355
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Study of the Thermal and Ballistic Properties of SMX
    Autorzy:
    Sizov, V. A.
    Pleshakov, D. V.
    Asachenko, A. F.
    Topchiy, M. A.
    Nechaev, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/358831.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    tetranitrate ester
    burning rate
    differential scanning calorimetry
    decomposition
    thermogravimetric analysis
    Opis:
    The high-density tetranitrate ester 1,4-dinitrato-2,3-dinitro-2,3-bis(nitratomethylene)butane (SMX) was synthesized. The methods of obtaining and isolating the intermediates were optimized. The differences between the syntheses of SMX by a four- and five-step scheme were investigated. Combustion of SMX and its catalysis was studied. The possibility of replacing NG as the main plasticizer in a double-base propellant composition was demonstrated. SMX particles were shown to have pronounced crystal faceting using scanning electron microscopy. The decomposition rate equation was determined. The amount of SMX decomposed under isothermal conditions (90 °C) was 0.8 wt.% after 60 min. Thermogravimetric analysis demonstrated that heating SMX results in two different processes – decomposition and evaporation, with SMX evaporating faster than it decomposes.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 1; 30-46
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study on alkali resistant glass fibre concrete and its exposure to elevated temperatures
    Autorzy:
    Hussain, S.
    Yadav, J. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818818.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    alkali resistant glass fibres
    accelerated carbonation
    compressive strength
    thermogravimetric analysis
    scanning electron microscopy
    split tensile strength
    włókna szklane
    alkalia
    karbonatyzacja
    przyspieszenie
    wytrzymałość na ściskanie
    analiza termograwimetryczna
    skaningowa mikroskopia elektronowa
    wytrzymałość na rozciąganie
    Opis:
    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.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2020, 103, 1; 5--15
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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