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  1. Article: Fabrication of strong bioresorbable composites from electroexplosive Fe-Fe

    Lozhkomoev, A S / Kazantsev, S O / Bakina, O V / Pervikov, A V / Sharipova, A F / Chymaevskii, A V / Lerner, M I

    Heliyon

    2022  Volume 8, Issue 9, Page(s) e10663

    Abstract: Bulk samples with high mechanical strength reaching 1000 MPa were obtained from electroexplosive Fe- ... ...

    Abstract Bulk samples with high mechanical strength reaching 1000 MPa were obtained from electroexplosive Fe-Fe
    Language English
    Publishing date 2022-09-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2022.e10663
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Fabrication of strong bioresorbable composites from electroexplosive Fe-Fe3O4 nanoparticles by isostatic pressing followed by vacuum sintering

    Lozhkomoev, A.S. / Kazantsev, S.O. / Bakina, O.V. / Pervikov, A.V. / Sharipova, A.F. / Chymaevskii, A.V. / Lerner, M.I.

    Heliyon. 2022 Sept., v. 8, no. 9 p.e10663-

    2022  

    Abstract: Bulk samples with high mechanical strength reaching 1000 MPa were obtained from electroexplosive Fe-Fe₃O₄ nanoparticles containing 81 wt. % Fe. Maximum strength is achieved by consolidation of the nanoparticles by isostatic pressing followed by vacuum ... ...

    Abstract Bulk samples with high mechanical strength reaching 1000 MPa were obtained from electroexplosive Fe-Fe₃O₄ nanoparticles containing 81 wt. % Fe. Maximum strength is achieved by consolidation of the nanoparticles by isostatic pressing followed by vacuum sintering at 700 °C. A further increase in the sintering temperature leads to the formation of large pores with a size of up to 5 μm and an intense interaction of Fe and Fe₃O₄ with the formation of FeO leading to the embrittlement of the samples and a decrease in their strength. The degradation rate of Fe- Fe₃O₄ samples in NaCl (0.9% wt.) and Hank's solution is 7 times higher than that of samples obtained by sintering an electroexplosive Fe nanopowder under the same conditions.
    Keywords nanoparticles ; strength (mechanics) ; temperature ; Fe-Fe3O4 nanopowders ; Electrical explosion of wire ; Bioresorbable composites ; Sintering ; Corrosion ; Strength
    Language English
    Dates of publication 2022-09
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2022.e10663
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Synthesis and antibacterial activity of cellulose acetate sheets modified with flower-shaped AlOOH/Ag

    Bakina, O. V / Glazkova, E. A / Lozhkomoev, A. S / Svarovskaya, N. V / Rodkevich, N. G / Lerner, M. I

    Cellulose. 2020 July, v. 27, no. 11

    2020  

    Abstract: Modified cellulose acetate antibacterial material was obtained by immobilizing Al/Ag nanoparticles on fabric fibres in water and subsequent hydrolysis of this nanoparticles under mild reaction condition. AlOOH/Ag self-assembled flower-shaped ... ...

    Abstract Modified cellulose acetate antibacterial material was obtained by immobilizing Al/Ag nanoparticles on fabric fibres in water and subsequent hydrolysis of this nanoparticles under mild reaction condition. AlOOH/Ag self-assembled flower-shaped nanostructures consist of AlOOH nanoplates and Ag inclusions. The AlOOH nanosheets size is of 150–300 nm, thickness is 5–7 nm. The silver inclusions were from 5 to 30 nm in size. Flower-shaped AlOOH/Ag nanostructures change the charge of fibres and stabilize Ag nanoparticles against agglomeration. The positive charge of the modified fibres improves the bacteria adsorption due to electrostatic interaction. The antibacterial activity of the nanoparticles and modified material arise due to the slow Ag⁺ migration into the medium from stabilized Ag nanoparticles. The nanoparticles and modified cellulose acetate sheets were characterized by transmission and scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction analysis, FTIR spectroscopy. The release of silver ions to the medium remains low for 70 h with AlOOH/Ag@CA reducing all the tested bacterial strains below the limit of detection (10² CFU/mL) within 3 h for Escherichia coli and 6 h for MRSA due to local effects of silver on adsorbed bacteria. The antibacterial activity of modified cellulose acetate fabric allows this method of modification to be exploited to produce materials for biomedical applications.
    Keywords Escherichia coli ; Fourier transform infrared spectroscopy ; X-ray diffraction ; adsorption ; antibacterial properties ; antibiotics ; cellulose ; cellulose acetate ; detection limit ; electrostatic interactions ; energy-dispersive X-ray analysis ; fabrics ; hydrolysis ; methicillin-resistant Staphylococcus aureus ; nanosheets ; nanosilver ; silver
    Language English
    Dates of publication 2020-07
    Size p. 6663-6676.
    Publishing place Springer Netherlands
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 1496831-9
    ISSN 1572-882X ; 0969-0239
    ISSN (online) 1572-882X
    ISSN 0969-0239
    DOI 10.1007/s10570-020-03250-2
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Cellulose acetate fibres surface modified with AlOOH/Cu particles: synthesis, characterization and antimicrobial activity

    Bakina, O. V / A. S. Lozhkomoev / E. A. Glazkova / M. I. Lerner / N. V. Svarovskaya

    Cellulose. 2018 Aug., v. 25, no. 8

    2018  

    Abstract: The AlOOH/Cu modified cellulose acetate fibres were prepared by a facile one-step method. First, the cellulose acetate fibres were treated in an aqueous suspension with the bimetallic Al/Cu nanoparticles, followed by their oxidation. Copper and copper ... ...

    Abstract The AlOOH/Cu modified cellulose acetate fibres were prepared by a facile one-step method. First, the cellulose acetate fibres were treated in an aqueous suspension with the bimetallic Al/Cu nanoparticles, followed by their oxidation. Copper and copper intermetallides do not react with water, while the aluminum does with boehmite formation. During this process AlOOH/Cu particles consisting of boehmite nanosheets self-assembled into flower-like agglomerates, and copper-rich fragments with size of 2 nm were formed. These inclusions could be spread uniformly through the whole volume of nanosheets or form a solid spherical copper-rich core in the center of AlOOH/Cu particles. The AlOOH nanosheets provide an adhesive attachment of the particles on the surface of the cellulose acetate fibres, and the slow migration of copper ions through the shell into the surrounding medium. The morphology, physical and chemical properties of the materials were characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, adsorption of nitrogen (BET method), Fourier transform infrared spectroscopy and electrophoretic mobility (ζ-potential measurement). The antibacterial activity of the hybrid fibrous sorbent prepared against Escherichia Coli and Staphylococcus Aureus was studied. Reduction of the concentration viable bacteria reached 100 % after exposure of the bacteria for 1 h to the hybrid fibrous absorbent.
    Keywords absorbents ; adsorption ; aluminum ; antibacterial properties ; bacteria ; boehmite ; cellulose ; cellulose acetate ; copper ; copper nanoparticles ; electrophoresis ; energy-dispersive X-ray analysis ; Escherichia coli ; Fourier transform infrared spectroscopy ; nanosheets ; nitrogen ; oxidation ; physicochemical properties ; scanning electron microscopy ; Staphylococcus aureus ; transmission electron microscopy ; X-ray diffraction ; zeta potential
    Language English
    Dates of publication 2018-08
    Size p. 4487-4497.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1496831-9
    ISSN 1572-882X ; 0969-0239
    ISSN (online) 1572-882X
    ISSN 0969-0239
    DOI 10.1007/s10570-018-1895-z
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Synthesis of core-shell AlOOH hollow nanospheres by reacting Al nanoparticles with water.

    Lozhkomoev, A S / Glazkova, E A / Bakina, O V / Lerner, M I / Gotman, I / Gutmanas, E Y / Kazantsev, S O / Psakhie, S G

    Nanotechnology

    2016  Volume 27, Issue 20, Page(s) 205603

    Abstract: A novel route for the synthesis of boehmite nanospheres with a hollow core and the shell composed of highly crumpled AlOOH nanosheets by oxidizing Al nanopowder in pure water under mild processing conditions is described. The stepwise events of Al ... ...

    Abstract A novel route for the synthesis of boehmite nanospheres with a hollow core and the shell composed of highly crumpled AlOOH nanosheets by oxidizing Al nanopowder in pure water under mild processing conditions is described. The stepwise events of Al transformation into boehmite are followed by monitoring the pH in the reaction medium. A mechanism of formation of hollow AlOOH nanospheres with a well-defined shape and crystallinity is proposed which includes the hydration of the Al oxide passivation layer, local corrosion of metallic Al accompanied by hydrogen evolution, the rupture of the protective layer, the dissolution of Al from the particle interior and the deposition of AlOOH nanosheets on the outer surface. In contrast to previously reported methods of boehmite nanoparticle synthesis, the proposed method is simple, and environmentally friendly and allows the generation of hydrogen gas as a by-product. Due to their high surface area and high, slit-shaped nanoporosity, the synthesized AlOOH nanostructures hold promise for the development of more effective catalysts, adsorbents, vaccines and drug carriers.
    MeSH term(s) Aluminum/chemistry ; Aluminum Hydroxide/chemistry ; Aluminum Oxide/chemistry ; Nanospheres/chemistry ; Nanospheres/ultrastructure ; Nanotechnology/methods ; Water/chemistry
    Chemical Substances Water (059QF0KO0R) ; Aluminum Hydroxide (5QB0T2IUN0) ; aluminum oxide hydroxide (63957-70-0) ; Aluminum (CPD4NFA903) ; Aluminum Oxide (LMI26O6933)
    Language English
    Publishing date 2016-05-20
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/0957-4484/27/20/205603
    Database MEDical Literature Analysis and Retrieval System OnLINE

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