Role of humic substances in the formation of nanosized particles of iron corrosion products

    Particle size distribution during a corrosion reactionRole of humic substances in the formation of nanosized particles of iron corrosion products. Pankratov D.A., Anuchina M.M. //Russian Journal of Physical Chemistry A. 2017. V.91. №2. P.233-239.Search the full text below. Ищи полный текст ниже.

    The corrosion of metallic iron in aqueous solutions of humic substances (HS) with limited access to air is studied. The HS are found to exhibit multiple functions. Acid–base, redox, and surfactant properties, along with the ability to form complexes with iron in solution, are displayed in the corrosion process. Partial reduction of the HS during the corrosion reaction and their adsorption onto the main corrosion product (Fe3O4 nanoparticles) are observed.

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    Ab Initio Calculations Of Hydroxoplatinum Compounds: I. Hexahydroxoplatinum(IV), (V), And (VI) Complexes

    Equilibrium structure of the hexahydroxoplatinum cluster Pt(OH)6 with symmetry CiAb Initio Calculations Of Hydroxoplatinum Compounds: I. Hexahydroxoplatinum(IV), (V), And (VI) Complexes. Pankratov D.A., Dement'ev A.I., Kiselev Yu.M. //Russian Journal of Inorganic Chemistry. 2008. V.53. №2. P.242-246.Search the full text below. Ищи полный текст ниже.

    The structural and spectral data on Pt(OH)6n clusters (n = -2, -1, 0) obtained by ab initio methods have been considered. The data for n = -2 are in good agreement with the published data for hexahydroxoplatinates (IV).

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    Emission Mössbauer Study Of "Cobalt Peroxide"

    Emission Mössbauer spectra of the same sample (A) immediately after preparation and (B) within 7 months after preparation and various temperaturesEmission Mössbauer Study Of "Cobalt Peroxide". Pankratov D.A., Portachenko T.A., Perfil'ev Yu.D. //Moscow University Chemistry Bulletin. 2008. V.49. №5. P.292-296.Search the full text below. Ищи полный текст ниже.

    The product interaction cooled alcohol solutions of the cobalt (II) chloride with hydrogen peroxide as described as CoO2 studied by emission Möessbauer spectroscopy. We show that dark green product is the cobalt (III) oxide.

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    Ab Initio Calculations Of Hydroxoplatinum Compounds: II. Binuclear Platinum(IV) Superoxo Complexes

    Equilibrium structure of the binuclear monobridged platinum superoxo complexes [(OH)5Pt(μ-O2)Pt(OH)5]3–Ab Initio Calculations Of Hydroxoplatinum Compounds: II. Binuclear Platinum(IV) Superoxo Complexes. Pankratov D.A., Dement'ev A.I., Kiselev Yu.M. //Russian Journal of Inorganic Chemistry. 2008. V.53. №2. P.247-253.Search the full text below. Ищи полный текст ниже.

    The structural and spectral data have been obtained by ab initio methods for the [(OH)4Pt(μ-O2)(μ-OH)Pt(OH)4]2-, [(OH)4Pt(μ-O2)(μ-OH)Pt(OH)4(OH)]3-, [(OH)5Pt(μ-O2)Pt(OH)5]3-, and [(H2O)(OH)4Pt(μ-O2)Pt(OH)4•(H2O)]- clusters, corresponding to binuclear platinum (IV) superoxo complexes with one and two bridges. The data obtained are in good agreement with experimental data and make it possible to judge the structure of available complexes.

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    Constrained growth of anisotropic magnetic δ-FeOOH nanoparticles in the presence of humic substances

    Function distribution magnetic splitting the mossbauer spectrum for different temperatures of the composite d-FeOOH-HSConstrained growth of anisotropic magnetic δ-FeOOH nanoparticles in the presence of humic substances. Polyakov A.Yu., Goldt A.E., Sorkina T.A., Perminova I.V., Pankratov D.A., Goodilin E.A., Tretyakov Y.D. //CrystEngComm. 2012. V.14. №23. P.8097-8102.Search the full text below. Ищи полный текст ниже.

    Natural polyelectrolytes, humic substances, are suggested to control in situ growth of feroxyhyte nanoparticles of a highly reduced mean size and with enhanced colloidal stability in salt solutions. The feroxyhyte is formed as 2-5 nm thick and 20 × 20 nm wide nanoflakes due to the blocking of developing facets of feroxyhyte and constraints caused by diffusion limitations of ionic constituents across partially charged branches of humic substances.

    Superparamagnetic iron oxide nanoparticles (SPIONs) are known as effective biocompatible agents for various biomedical applications like drug delivery, in vivo magnetic resonance imaging, cell and protein separation, hyperthermia and transfection. At present, synthesis and application of rods, disks, fibers, tubes, sheets, ellipsoids, dumbbell-shaped, acorn-shaped and other anisotropic nanoparticles attract growing attention because of their unique properties. Aggregation is a serious problem in the preparation and storage of such magnetic nanoparticles limiting considerably their practical applications. This problem can be solved by a surface modification of nanoparticles with organic macromolecules, their preparation in the presence of surfactants, application of hydrophilic, surface-active ligands improving biocompatibility and resulting in multifunctional nanoparticles for medical diagnostics.

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