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  1. Article: On the Formation of Nanocrystalline Grains in Metallic Glasses by Means of In-Situ Nuclear Forward Scattering of Synchrotron Radiation.

    Smrčka, David / Procházka, Vít / Vrba, Vlastimil / Miglierini, Marcel B

    Nanomaterials (Basel, Switzerland)

    2019  Volume 9, Issue 4

    Abstract: Application of the so-called nuclear forward scattering (NFS) of synchrotron radiation is presented for the study of crystallization of metallic glasses. In this process, nanocrystalline alloys are formed. Using NFS, the transformation process can be ... ...

    Abstract Application of the so-called nuclear forward scattering (NFS) of synchrotron radiation is presented for the study of crystallization of metallic glasses. In this process, nanocrystalline alloys are formed. Using NFS, the transformation process can be directly observed during in-situ temperature experiments not only from the structural point of view, i.e., formation of nanocrystalline grains, but one can also observe evolution of the corresponding hyperfine interactions. In doing so, we have revealed the influence of external magnetic field on the crystallization process. The applied magnetic field is not only responsible for an increase of hyperfine magnetic fields within the newly formed nanograins but also the corresponding components in the NFS time spectra are better identified via occurrence of quantum beats with higher frequencies. In order to distinguish between these two effects, simulated and experimental NFS time spectra obtained during in-situ temperature measurements with and without external magnetic field are compared.
    Language English
    Publishing date 2019-04-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano9040544
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Fungal-induced modification of spontaneously precipitated ochreous sediments from drainage of abandoned antimony mine.

    Miglierini, Marcel B / Dekan, Július / Urík, Martin / Cesnek, Martin / Kmječ, Tomáš / Matúš, Peter

    Chemosphere

    2020  Volume 269, Page(s) 128733

    Abstract: Iron-containing spontaneously precipitated ochreous sediments serve as natural scavengers of various migrating elements and in this way contribute to removal and immobilization of potentially hazardous elements especially from mine drainage outflows. On ... ...

    Abstract Iron-containing spontaneously precipitated ochreous sediments serve as natural scavengers of various migrating elements and in this way contribute to removal and immobilization of potentially hazardous elements especially from mine drainage outflows. On the other hand, presence of filamentous fungi in their surroundings triggers biotransformation and contributes to the mobility of these elements. Three groups of samples of spontaneously precipitated ochreous sediments from an abandoned antimony mine in Poproč, Slovakia were studied: as-collected, sterilized at 95 °C for 30 min, and exposed to incubation with filamentous fungus Aspergillus niger which is frequently found in soils. Employing chemical analyses have determined the content of Fe, As, Sb, and Zn in the samples as well as their mobilization among the non-dissolved residue, culture medium of the fungus and/or its biomass. Significant degree of biovolatilization of antimony was unveiled. Speciation of iron was performed by
    MeSH term(s) Antimony/analysis ; Fungi ; Iron ; Slovakia ; Soil Pollutants/analysis
    Chemical Substances Soil Pollutants ; Antimony (9IT35J3UV3) ; Iron (E1UOL152H7)
    Language English
    Publishing date 2020-10-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.128733
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2540: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
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  3. Article ; Online: Mobilisation of hazardous elements from arsenic-rich mine drainage ochres by three Aspergillus species.

    Urík, Martin / Farkas, Bence / Miglierini, Marcel B / Bujdoš, Marek / Mitróová, Zuzana / Kim, Hyunjung / Matúš, Peter

    Journal of hazardous materials

    2021  Volume 409, Page(s) 124938

    Abstract: Natural ferric ochres that precipitate in streambeds at abandoned mining sites are natural scavengers of various metals and metalloids. Thus, their chemical and structural modification via microbial activity should be considered in evaluation of the ... ...

    Abstract Natural ferric ochres that precipitate in streambeds at abandoned mining sites are natural scavengers of various metals and metalloids. Thus, their chemical and structural modification via microbial activity should be considered in evaluation of the risks emerging from probable spread of contamination at mining sites. Our results highlight the role of various aspergilli strains in this process via production of acidic metabolites that affect mobility and bioavailability of coprecipitated contaminants. The Mössbauer analysis revealed subtle structural changes of iron in ochres, while the elemental analysis of non-dissolved residues of ochres that were exposed to filamentous fungi suggest coinciding bioextraction of arsenic and antimony with extensive iron mobilisation. However, the zinc bioextraction by filamentous fungi is less likely dependent on iron leaching from ferric ochres. The strain specific bioextraction efficiency and subsequent bioaccumulation of mobilised metals resulted in distinct tolerance responses among the studied soil fungal strains. However, regardless the burden of bioextracted metal(loid)s on its activity, the Aspergillus niger strain has shown remarkable capability to decrease pH of its environment and, thus, bioextract significant and environmentally relevant amounts of potentially toxic elements from the natural ochres.
    MeSH term(s) Antimony ; Arsenic/analysis ; Aspergillus ; Metalloids/analysis ; Metals, Heavy/analysis ; Mining ; Soil Pollutants/analysis
    Chemical Substances Metalloids ; Metals, Heavy ; Soil Pollutants ; Antimony (9IT35J3UV3) ; Arsenic (N712M78A8G)
    Language English
    Publishing date 2021-01-12
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2020.124938
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  4. Article: Methods of Ex Situ and In Situ investigations of structural transformations: the case of crystallization of metallic glasses

    Miglierini, Marcel B / Procházka, Vít / Vrba, Vlastimil / Švec, Peter / Janičkovič, Dušan / Matúš, Peter

    Journal of visualized experiments. 2018 June 07, , no. 136

    2018  

    Abstract: We demonstrate the use of two nuclear-based analytical methods that can follow the modifications of microstructural arrangement of iron-based metallic glasses (MGs). Despite their amorphous nature, the identification of hyperfine interactions unveils ... ...

    Abstract We demonstrate the use of two nuclear-based analytical methods that can follow the modifications of microstructural arrangement of iron-based metallic glasses (MGs). Despite their amorphous nature, the identification of hyperfine interactions unveils faint structural modifications. For this purpose, we have employed two techniques that utilize nuclear resonance among nuclear levels of a stable 57Fe isotope, namely Mössbauer spectrometry and nuclear forward scattering (NFS) of synchrotron radiation. The effects of heat treatment upon (Fe2.85Co1)77Mo8Cu1B14 MG are discussed using the results of ex situ and in situ experiments, respectively. As both methods are sensitive to hyperfine interactions, information on structural arrangement as well as on magnetic microstructure is readily available. Mössbauer spectrometry performed ex situ describes how the structural arrangement and magnetic microstructure appears at room temperature after the annealing under certain conditions (temperature, time), and thus this technique inspects steady states. On the other hand, NFS data are recorded in situ during dynamically changing temperature and NFS examines transient states. The use of both techniques provides complementary information. In general, they can be applied to any suitable system in which it is important to know its steady state but also transient states.
    Keywords ambient temperature ; annealing ; crystallization ; heat treatment ; isotopes ; magnetism ; microstructure ; spectroscopy
    Language English
    Dates of publication 2018-0607
    Size p. e57657.
    Publishing place Journal of Visualized Experiments
    Document type Article
    ZDB-ID 2259946-0
    ISSN 1940-087X
    ISSN 1940-087X
    DOI 10.3791/57657
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses.

    Miglierini, Marcel B / Procházka, Vít / Vrba, Vlastimil / Švec, Peter / Janičkovič, Dušan / Matúš, Peter

    Journal of visualized experiments : JoVE

    2018  , Issue 136

    Abstract: We demonstrate the use of two nuclear-based analytical methods that can follow the modifications of microstructural arrangement of iron-based metallic glasses (MGs). Despite their amorphous nature, the identification of hyperfine interactions unveils ... ...

    Abstract We demonstrate the use of two nuclear-based analytical methods that can follow the modifications of microstructural arrangement of iron-based metallic glasses (MGs). Despite their amorphous nature, the identification of hyperfine interactions unveils faint structural modifications. For this purpose, we have employed two techniques that utilize nuclear resonance among nuclear levels of a stable
    MeSH term(s) Alloys/chemistry ; Crystallization/methods ; Materials Testing ; Surface Properties
    Chemical Substances Alloys
    Language English
    Publishing date 2018-06-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Video-Audio Media
    ZDB-ID 2259946-0
    ISSN 1940-087X ; 1940-087X
    ISSN (online) 1940-087X
    ISSN 1940-087X
    DOI 10.3791/57657
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: The Effect of High Selenite and Selenate Concentrations on Ferric Oxyhydroxides Transformation under Alkaline Conditions.

    Matulová, Michaela / Bujdoš, Marek / Miglierini, Marcel B / Cesnek, Martin / Duborská, Eva / Mosnáčková, Katarína / Vojtková, Hana / Kmječ, Tomáš / Dekan, Július / Matúš, Peter / Urík, Martin

    International journal of molecular sciences

    2021  Volume 22, Issue 18

    Abstract: Iron-based nanomaterials have high technological impacts on various pro-environmental applications, including wastewater treatment using the co-precipitation method. The purpose of this research was to identify the changes of iron nanomaterial's ... ...

    Abstract Iron-based nanomaterials have high technological impacts on various pro-environmental applications, including wastewater treatment using the co-precipitation method. The purpose of this research was to identify the changes of iron nanomaterial's structure caused by the presence of selenium, a typical water contaminant, which might affect the removal when the iron co-precipitation method is used. Therefore, we have investigated the maturation of co-precipitated nanosized ferric oxyhydroxides under alkaline conditions and their thermal transformation into hematite in the presence of selenite and selenate with high concentrations. Since the association of selenium with precipitates surfaces has been proven to be weak, the mineralogy of the system was affected insignificantly, and the goethite was identified as an only ferric phase in all treatments. However, the morphology and the crystallinity of ferric oxyhydroxides was slightly altered. Selenium affected the structural order of precipitates, especially at the initial phase of co-precipitation. Still, the crystal integrity and homogeneity increased with time almost constantly, regardless of the treatment. The thermal transformation into well crystalized hematite was more pronounced in the presence of selenite, while selenate-treated and selenium-free samples indicated the presence of highly disordered fraction. This highlights that the aftermath of selenium release does not result in destabilization of ferric phases; however, since weak interactions of selenium are dominant at alkaline conditions with goethite's surfaces, it still poses a high risk for the environment. The findings of this study should be applicable in waters affected by mining and metallurgical operations.
    MeSH term(s) Alkalies/chemistry ; Chemical Precipitation ; Crystallization ; Ferric Compounds/chemistry ; Iron/chemistry ; Iron Compounds/chemistry ; Minerals/chemistry ; Selenic Acid/chemistry ; Selenious Acid/chemistry ; Spectroscopy, Fourier Transform Infrared ; Spectroscopy, Mossbauer ; Temperature
    Chemical Substances Alkalies ; Ferric Compounds ; Iron Compounds ; Minerals ; goethite (1310-14-1) ; ferric oxyhydroxide (87PZU03K0K) ; Iron (E1UOL152H7) ; Selenious Acid (F6A27P4Q4R) ; Selenic Acid (HV0Y51NC4J)
    Language English
    Publishing date 2021-09-15
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms22189955
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  7. Article ; Online: Antimony leaching from antimony-bearing ferric oxyhydroxides by filamentous fungi and biotransformation of ferric substrate.

    Urík, Martin / Polák, Filip / Bujdoš, Marek / Miglierini, Marcel B / Milová-Žiaková, Barbora / Farkas, Bence / Goneková, Zuzana / Vojtková, Hana / Matúš, Peter

    The Science of the total environment

    2019  Volume 664, Page(s) 683–689

    Abstract: Ferric oxyhydroxides are natural scavengers of antimony, thus, they contribute significantly to antimony immobilization in soils and sediments. Recent studies, however, usually omit microbial influence on geochemically stable antimony-ferric oxyhydroxide ...

    Abstract Ferric oxyhydroxides are natural scavengers of antimony, thus, they contribute significantly to antimony immobilization in soils and sediments. Recent studies, however, usually omit microbial influence on geochemically stable antimony-ferric oxyhydroxide association. Therefore, we have evaluated fungal contribution to antimony mobility during static cultivation of common soil fungus Aspergillus niger in presence of ferric oxyhydroxides. Our results indicate distinguished effect of fungus on antimony distribution at two different antimony concentrations that were used for antimony pre-adsorbtion onto ferric oxyhydroxides prior to the inoculation. Approximately 36% of antimony was bioextracted by fungus from antimony bearing ferric oxyhydroxide after 14-day cultivation when the 8.9 mg·L
    MeSH term(s) Adsorption ; Antimony/chemistry ; Antimony/metabolism ; Biotransformation ; Ferric Compounds/chemistry ; Fungi/physiology ; Soil Pollutants/chemistry ; Soil Pollutants/metabolism
    Chemical Substances Ferric Compounds ; Soil Pollutants ; ferric oxide (1K09F3G675) ; ferric oxyhydroxide (87PZU03K0K) ; Antimony (9IT35J3UV3)
    Language English
    Publishing date 2019-02-03
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2019.02.033
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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