Surface structure of finely dispersed iron powders I. Formation of stabilizing coating

Mikhailik, O.M.; Povstugar, V. I.; Mikhailova, S. S.; Lyakhovich, A. M.; Fedorenko, O.M.; Kurbatova, G.T.; Shklovskaya, N. I.; Chuiko, A. A.

doi:10.1016/0166-6622(91)80024-i

Cited by 24 publications

(7 citation statements)

References 13 publications

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“…As a consequence, there has been little extension of the academic research on nanoparticles into new commercial products. In contrast, electrochemistry is a well-developed industrial technique often used to produce powders, mainly copper, iron, nickel, and cobalt powders, with a mean diameter ranging from 10 to 100 μm. − A reduction of the mean diameter of electrolytically prepared particles has been achieved recently by several methods including increased agitation of the electrolytic bath, increased plating current density, pulsed reversed current deposition, and the addition of organic electrocrystallization inhibitors. ,,− Nanodeposits or micropowders with a mean diameter of between 1 and 10 μm, but occasionally contaminated by the electrolyte or the inhibitors, have been produced.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Nanopowders: Ultrasound-Assisted Electrochemical Preparation and Properties

et al. 2000

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The development of cost-effective nanopowder production methods has been a major obstacle to the development and industrial utilization of nanostructured materials. This paper describes a new cost-effective production technology for these materials which combines both pulsed electrochemistry and pulsed ultrasound. This technique has been applied to the synthesis of pure and binary and ternary alloyed nanopowders containing iron, cobalt, and nickel. The resulting nanopowders have been characterized by transmission electron microscopy, X-ray fluorescence, transmission high-energy electron diffraction, X-ray diffraction, and Mössbauer spectroscopy. The results indicate that this new production method is ideal for the preparation of high performance nanocomposite powders and related high-density nanocomposite materials.

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Section: Introductionmentioning

confidence: 99%

Magnetic Nanopowders: Ultrasound-Assisted Electrochemical Preparation and Properties

et al. 2000

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“…4 Finely dispersed iron powder with a stabilizing layer based on oleic acid and isophytol was used as the initial substance. According to electron microscopy data, the average particle size was ¾200 nm.…”

Section: Methodsmentioning

confidence: 99%

“…This is quite probable, because the molecules in stabilizing layers form a highly ordered, hexagonal, closely packed condensed layer. 8 As we cannot imagine the plausible mechanism of the formation of such structures, we shall call them 'quasi-graphite' structures. The difference in binding energy of these peaks for the initial (284.1 eV) and irradiated (283.6 eV) FDIP [Figs 4(a) and (c)] most probably derives from the change in the degree of order in the condensed stabilizing layer during the irradiation.…”

Section: Low-energy Peak In the C 1s Spectrummentioning

confidence: 99%

“…3 However, the structure of the resulting polyacrylamide (PAA) layers on polymer surfaces and on the FDIP surfaces should be considerably different. In our previous papers we have described the structure of a stabilizing coating of the electrodeposited FDIP, 4 as well as the structure of the surface of the above FDIP, modified with -aminopropyl(triethoxy)silane, 5 vinylmethyl(dichloro)silane 6 and hexamethylenediamine. 7 In this paper we report the XPS study of the structural peculiarities of a radiation-grafted PAA layer on the surface of stabilized FDIP.…”

Section: Introductionmentioning

confidence: 99%

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XPS study of finely dispersed iron powders modified by radiation-grafted acrylamide

Mikhailova¹,

Mykhaylyk

Dorfman³

et al. 2000

Surf. Interface Anal.

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X-ray photoelectron spectroscopy was used to investigate structural peculiarities of the modifying layer obtained by means of radiation grafting of acrylamide (AA) on the surface of finely dispersed iron powder (FDIP) with a stabilizing coating based on oleic acid and isophytol. Judging by the information obtained on the grafting degree of AA, the highest grafting degree has been attained with water used as the monomer solvent (direct technique). The reasons for the grafting failure while using 'the hydroperoxide technique' have been discussed. Based on the XPS data, the mechanism of AA grafting from water solution to the surface of FDIP with a stabilizing coating has been proposed. The grafting process has been assumed to be associated with the formation of linear chains, including several types of reactive N-and O-containing groups at the active sites of the FDIP stabilizing layer. Such active sites are presumably represented by Fe(III), which are the central atoms of the complex compounds on the outer surface of the stabilizing coating. Polyacrylamidegrafted chains with hydrophobic radicals and a set of polar groups replace some of the monomer ligands around Fe(III) in the process of grafting. This process is most likely followed by the formation of chelate structures. The use of a chemical derivatization technique has provided insight into the nature of the peaks in the region of 284 eV in the C 1s spectra. The appearance of these peaks results from the formation of 'quasi-graphite' structures by isolated C C bonds present in a closely packed, highly oriented, stabilizing coating of iron powders under study.

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“…% of Fe), magnetite Fe 3 O 4 and an admixture of Fe 2 O 3 . 539 Sometimes magnetically active particles are introduced into different gels, viz., into silicon, 540 polyacrylamide, 541 poly(ethylene oxide) 542 etc. gels.…”

Section: Major Fields Of Application Of Hybrid Nanocompositesmentioning

confidence: 99%

Hybrid polymer-inorganic nanocomposites

Pomogailo¹

2000

Russ. Chem. Rev.

169

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Surface structure of finely dispersed iron powders I. Formation of stabilizing coating

Cited by 24 publications

References 13 publications

Magnetic Nanopowders: Ultrasound-Assisted Electrochemical Preparation and Properties

Magnetic Nanopowders: Ultrasound-Assisted Electrochemical Preparation and Properties

XPS study of finely dispersed iron powders modified by radiation-grafted acrylamide

Hybrid polymer-inorganic nanocomposites

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