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  1. Article ; Online: An effect of scandium substitution on the phase purity and structural, magnetic, and electrochemical features of ε-Fe

    Polášková, Michaela / Malina, Ondřej / Tuček, Jiří / Jakubec, Petr

    Nanoscale

    2022  Volume 14, Issue 14, Page(s) 5501–5513

    Abstract: A series of Sc-substituted ε- ... ...

    Abstract A series of Sc-substituted ε-Fe
    Language English
    Publishing date 2022-04-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d2nr00392a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-amino-1,2,4-triazole Spin Crossover Nanoparticles.

    Lalioti, Nikolia / Charitos, Alexander / Parthenios, John / Malina, Ondrej / Polaskova, Michaela / Petr, Martin / Tangoulis, Vassilis

    Molecules (Basel, Switzerland)

    2023  Volume 28, Issue 15

    Abstract: A novel experimental protocol based on a reverse micellar method is presented for the synthesis of graphene oxide (GO)-based hybrids with spin crossover nanoparticles (SCO NPs) of the 1D iron(II) coordination polymer with the formula [Fe( ... ...

    Abstract A novel experimental protocol based on a reverse micellar method is presented for the synthesis of graphene oxide (GO)-based hybrids with spin crossover nanoparticles (SCO NPs) of the 1D iron(II) coordination polymer with the formula [Fe(NH
    Language English
    Publishing date 2023-08-02
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules28155816
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  3. Article: Microwave-Enhanced Crystalline Properties of Zinc Ferrite Nanoparticles.

    Ochmann, Martin / Vrba, Vlastimil / Kopp, Josef / Ingr, Tomáš / Malina, Ondřej / Machala, Libor

    Nanomaterials (Basel, Switzerland)

    2022  Volume 12, Issue 17

    Abstract: Two series of ... ...

    Abstract Two series of ZnFe
    Language English
    Publishing date 2022-08-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano12172987
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Observation of two-step spin transition in iron(II) 4-amino-1,2,4-triazole based spin crossover nanoparticles.

    Lalioti, Nikolia / Giannopoulou, Efstathia / Charitos, Alexander / Parthenios, John / Malina, Ondrej / Polaskova, Michaela / Kalarakis, Alexandros / Tangoulis, Vassilis

    Dalton transactions (Cambridge, England : 2003)

    2023  Volume 52, Issue 10, Page(s) 2937–2941

    Abstract: A synthetically controllable two-step spin transition was observed in iron(II) spin crossover nanoparticles of the dehydrated one-dimensional coordination polymer [Fe( ... ...

    Abstract A synthetically controllable two-step spin transition was observed in iron(II) spin crossover nanoparticles of the dehydrated one-dimensional coordination polymer [Fe(NH
    Language English
    Publishing date 2023-03-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/d2dt04118a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: 2-D spin crossover materials at the nanometric scale: the effects of the size-reduction on the magnetic properties.

    Tangoulis, Vassilis / Polyzou, Christina D / Gkolfi, Patroula / Lalioti, Nikolia / Malina, Ondrej / Polaskova, Michaela

    Dalton transactions (Cambridge, England : 2003)

    2021  Volume 50, Issue 9, Page(s) 3109–3115

    Abstract: Spin Crossover (SCO) particles at the nanometric scale provide an alternative point of view and a new perspective concerning the development of a new generation of spintronic, electronic, photonic and mechanical devices. The coexistence of the SCO ... ...

    Abstract Spin Crossover (SCO) particles at the nanometric scale provide an alternative point of view and a new perspective concerning the development of a new generation of spintronic, electronic, photonic and mechanical devices. The coexistence of the SCO phenomenon with the accompanying hysteresis loop enhances the functionality of future devices for storing and processing information. Despite all promising facts, the SCO phenomena are greatly affected by cooperativity issues resulting in a direct relation between the decrease of the size of nanopatricle and the overall decrease of cooperativity towards more gradual spin transitions. This minireview aims to summarise the synthetic techniques for the synthesis of 2-D FeII SCO particles at the nanometric scale, an underexplored area of research, highlighting the effects of the size-reduction on the magnetic properties of the corresponding nanoparticles and hopefuly showcasing the importance of studying in the context of 2D limit the SCO phenomena.
    Language English
    Publishing date 2021-02-10
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/d1dt00250c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Iron Nitride Nanoparticles for Enhanced Reductive Dechlorination of Trichloroethylene.

    Brumovský, Miroslav / Oborná, Jana / Micić, Vesna / Malina, Ondřej / Kašlík, Josef / Tunega, Daniel / Kolos, Miroslav / Hofmann, Thilo / Karlický, František / Filip, Jan

    Environmental science & technology

    2022  Volume 56, Issue 7, Page(s) 4425–4436

    Abstract: Nitriding has been used for decades to improve the corrosion resistance of iron and steel materials. Moreover, iron nitrides ( ... ...

    Abstract Nitriding has been used for decades to improve the corrosion resistance of iron and steel materials. Moreover, iron nitrides (Fe
    MeSH term(s) Groundwater ; Iron ; Nanoparticles ; Trichloroethylene ; Water Pollutants, Chemical
    Chemical Substances Water Pollutants, Chemical ; Trichloroethylene (290YE8AR51) ; Iron (E1UOL152H7)
    Language English
    Publishing date 2022-03-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.1c08282
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Iron Nitride Nanoparticles for Enhanced Reductive Dechlorination of Trichloroethylene

    Brumovský, Miroslav / Oborná, Jana / Micić, Vesna / Malina, Ondřej / Kašlík, Josef / Tunega, Daniel / Kolos, Miroslav / Hofmann, Thilo / Karlický, František / Filip, Jan

    Environmental science & technology. 2022 Mar. 09, v. 56, no. 7

    2022  

    Abstract: Nitriding has been used for decades to improve the corrosion resistance of iron and steel materials. Moreover, iron nitrides (FeₓN) have been shown to give an outstanding catalytic performance in a wide range of applications. We demonstrate that ... ...

    Abstract Nitriding has been used for decades to improve the corrosion resistance of iron and steel materials. Moreover, iron nitrides (FeₓN) have been shown to give an outstanding catalytic performance in a wide range of applications. We demonstrate that nitriding also substantially enhances the reactivity of zerovalent iron nanoparticles (nZVI) used for groundwater remediation, alongside reducing particle corrosion. Two different types of FeₓN nanoparticles were synthesized by passing gaseous NH₃/N₂ mixtures over pristine nZVI at elevated temperatures. The resulting particles were composed mostly of face-centered cubic (γ′-Fe₄N) and hexagonal close-packed (ε-Fe₂–₃N) arrangements. Nitriding was found to increase the particles’ water contact angle and surface availability of iron in reduced forms. The two types of FeₓN nanoparticles showed a 20- and 5-fold increase in the trichloroethylene (TCE) dechlorination rate, compared to pristine nZVI, and about a 3-fold reduction in the hydrogen evolution rate. This was related to a low energy barrier of 27.0 kJ mol–¹ for the first dechlorination step of TCE on the γ′-Fe₄N(001) surface, as revealed by density functional theory calculations with an implicit solvation model. TCE dechlorination experiments with aged particles showed that the γ′-Fe₄N nanoparticles retained high reactivity even after three months of aging. This combined theoretical-experimental study shows that FeₓN nanoparticles represent a new and potentially important tool for TCE dechlorination.
    Keywords catalytic activity ; contact angle ; corrosion ; dechlorination ; density functional theory ; energy ; groundwater ; hydrogen production ; iron ; models ; nitrides ; remediation ; solvation ; steel ; trichloroethylene
    Language English
    Dates of publication 2022-0309
    Size p. 4425-4436.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1520-5851
    DOI 10.1021/acs.est.1c08282
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Core–Shell Fe/FeS Nanoparticles with Controlled Shell Thickness for Enhanced Trichloroethylene Removal

    Brumovský, Miroslav / Filip, Jan / Malina, Ondřej / Oborná, Jana / Sracek, Ondra / Reichenauer, Thomas G / Andrýsková, Pavlína / Zbořil, Radek

    ACS applied materials & interfaces. 2020 July 08, v. 12, no. 31

    2020  

    Abstract: Zero-valent iron nanoparticles (nZVI) treated by reduced sulfur compounds (i.e., sulfidated nZVI, S-nZVI) have attracted increased attention as promising materials for environmental remediation. While the preparation of S-nZVI and its reactions with ... ...

    Abstract Zero-valent iron nanoparticles (nZVI) treated by reduced sulfur compounds (i.e., sulfidated nZVI, S-nZVI) have attracted increased attention as promising materials for environmental remediation. While the preparation of S-nZVI and its reactions with various groundwater contaminants such as trichloroethylene (TCE) were already a subject of several studies, nanoparticle synthesis procedures investigated so far were suited mainly for laboratory-scale preparation with only a limited possibility of easy and cost-effective large-scale production and FeS shell property control. This study presents a novel approach for synthesizing S-nZVI using commercially available nZVI particles that are treated with sodium sulfide in a concentrated slurry. This leads to S-nZVI particles that do not contain hazardous boron residues and can be easily prepared off-site. The resulting S-nZVI exhibits a core–shell structure where zero-valent iron is the dominant phase in the core, while the shell contains mostly amorphous iron sulfides. The average FeS shell thickness can be controlled by the applied sulfide concentration. Up to a 12-fold increase in the TCE removal and a 7-fold increase in the electron efficiency were observed upon amending nZVI with sulfide. Although the FeS shell thickness correlated with surface-area-normalized TCE removal rates, sulfidation negatively impacted the particle surface area, resulting in an optimal FeS shell thickness of approximately 7.3 nm. This corresponded to a particle S/Fe mass ratio of 0.0195. At all sulfide doses, the TCE degradation products were only fully dechlorinated hydrocarbons. Moreover, a nearly 100% chlorine balance was found at the end of the experiments, further confirming complete TCE degradation and the absence of chlorinated transformation products. The newly synthesized S-nZVI particles thus represent a promising remedial agent applicable at sites contaminated with TCE.
    Keywords boron ; chlorine ; cost effectiveness ; groundwater contamination ; iron ; nanoparticles ; remediation ; slurries ; sodium sulfide ; sulfur ; surface area ; trichloroethylene
    Language English
    Dates of publication 2020-0708
    Size p. 35424-35434.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.0c08626
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: A facile approach to prepare silica hybrid, spin-crossover water-soluble nanoparticles as potential candidates for thermally responsive MRI agents.

    Gkolfi, Patroula / Tsivaka, Dimitra / Tsougos, Ioannis / Vassiou, Katerina / Malina, Ondřej / Polaskova, Michaela / Polyzou, Christina D / Chasapis, Christos T / Tangoulis, Vassilis

    Dalton transactions (Cambridge, England : 2003)

    2021  Volume 50, Issue 38, Page(s) 13227–13231

    Abstract: A reverse micelle method was used for the synthesis of water-soluble silica hybrid, spin-crossover (SCO) nanoparticles (NPs). MRI experiments provided temperature ... ...

    Abstract A reverse micelle method was used for the synthesis of water-soluble silica hybrid, spin-crossover (SCO) nanoparticles (NPs). MRI experiments provided temperature dependent
    Language English
    Publishing date 2021-10-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/d1dt02479e
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Condensed Clustered Iron Oxides for Ultrahigh Photothermal Conversion and In Vivo Multimodal Imaging

    Kolokithas-Ntoukas, Argiris / Bakandritsos, Aristides / Belza, Jan / Kesa, Peter / Herynek, Vit / Pankrac, Jan / Angelopoulou, Athina / Malina, Ondrej / Avgoustakis, Konstantinos / Georgakilas, Vasilios / Polakova, Katerina / Zboril, Radek

    ACS applied materials & interfaces. 2021 May 04, v. 13, no. 25

    2021  

    Abstract: Magnetic iron oxide nanocrystals (MIONs) are established as potent theranostic nanoplatforms due to their biocompatibility and the multifunctionality of their spin-active atomic framework. Recent insights have also unveiled their attractive near-infrared ...

    Abstract Magnetic iron oxide nanocrystals (MIONs) are established as potent theranostic nanoplatforms due to their biocompatibility and the multifunctionality of their spin-active atomic framework. Recent insights have also unveiled their attractive near-infrared photothermal properties, which are, however, limited by their low near-infrared absorbance, resulting in noncompetitive photothermal conversion efficiencies (PCEs). Herein, we report on the dramatically improved photothermal conversion of condensed clustered MIONs, reaching an ultrahigh PCE of 71% at 808 nm, surpassing the so-far MION-based photothermal agents and even benchmark near-infrared photothermal nanomaterials. Moreover, their surface passivation is achieved through a simple self-assembly process, securing high colloidal stability and structural integrity in complex biological media. The bifunctional polymeric canopy simultaneously provided binding sites for anchoring additional cargo, such as a strong near-infrared-absorbing and fluorescent dye, enabling in vivo optical and photoacoustic imaging in deep tissues, while the iron oxide core ensures detection by magnetic resonance imaging. In vitro studies also highlighted a synergy-amplified photothermal effect that significantly reduces the viability of A549 cancer cells upon 808 nm laser irradiation. Integration of such—previously elusive—photophysical properties with simple and cost-effective nanoengineering through self-assembly represents a significant step toward sophisticated nanotheranostics, with great potential in the field of nanomedicine.
    Keywords absorbance ; biocompatibility ; canopy ; cost effectiveness ; fluorescent dyes ; iron oxides ; irradiation ; magnetism ; nanocrystals ; nanomedicine ; polymers ; viability
    Language English
    Dates of publication 2021-0504
    Size p. 29247-29256.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.1c00908
    Database NAL-Catalogue (AGRICOLA)

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