Evolution of morphology, structure, and magnetic parameters of Ni nanotubes with growth in pores of a PET template

Shumskaya, Elena; Bundyukova, Victoria; Kozlovskiy, Artem L.; Zdorovets, Maxim V.; Kadyrzhanov, K.K.; Kalkabay, Gulnar; Kaniukov, Egor

doi:10.1016/j.jmmm.2019.165913

Cited by 19 publications

(12 citation statements)

References 22 publications

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“…As is known, there is not much data on the stability and resistance to external influences of nanostructured materials, and most of what exists is from scattered studies related to studying the effects of external factors on certain properties of nanomaterials [1][2][3]. Moreover, almost all nanostructured materials obtained by various methods are, to one degree or another, nonequilibrium structures with nonequilibrium phases; strong distortions and deformations of the structure; and high porosity or degree of disorder [4,5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Structural Changes and Catalytic Properties of FeNi Nanostructures as a Result of Exposure to Gamma Radiation

et al. 2020

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The paper presents the results of changes in the structural characteristics, and the degree of texturing of FeNi nanostructures close in composition to permalloy compounds as a result of directed modification by gamma radiation with an energy of 1.35 MeV and doses from 100 to 500 kGy. The choices of energy and radiation doses were due to the need to modify the structural properties, which consisted of annealing the point defects that occurred during the synthesis along the entire length of the nanotubes. The initial FeNi nanostructures were polycrystalline nanotubes of anisotropic crystallite orientation, obtained by electrochemical deposition. The study found that exposure to gamma rays led to fewer defects in the structure, and reorientation of crystallites, and at doses above 300 kGy, the presence of one selected texture direction (111) in the structure. During tests of the corrosion resistance of synthesized and modified nanostructures in a PBS solution at various temperatures, it was found that exposure to gamma rays led to a significant decrease in the rate of degradation of nanotubes and an increase in the potential life of up to 20 days. It was established that at the first stage of testing, the degradation of nanostructures is accompanied by the formation of oxide inclusions, which subsequently lead to the formation of pitting corrosion and subsequent partial or complete destruction of the nanostructures. It is shown that gamma radiation is promising not only for targeted modification of nanostructures and increasing resistance to degradation, but also for increasing the rate of catalytic reactions of the PNA-PPD type.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Structural Changes and Catalytic Properties of FeNi Nanostructures as a Result of Exposure to Gamma Radiation

et al. 2020

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“…There has been a significant amount of interest for track-etched membrane (TeMs) in MD. A unique feature of TeMs is the control of the number of pores per unit area [20][21][22][23][24][25], which significantly expands fields of application in sensing [26], catalysis [27][28][29][30][31], lithium-ion batteries [32,33], template synthesis of nanostructures [34][35][36][37][38]. At the present time various types of polymers are known, intended as a material for TeMs.…”

Section: Introductionmentioning

confidence: 99%

Phenol solutions treatment by using hydrophobized track-etched membranes

Yeszhanov¹,

Dosmagambetova²

2020

Bull. of the Kar. Univ. "Chem". Ser.

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Phenols are one of the most common surface water pollution. The discharge of phenolic waters into water bodies and streams sharply degrade their general sanitary condition, since these compounds have a toxic effect, and phenols can intensively absorb oxygen dissolved in water, which negatively affects the life of organisms in water bodies. Therefore, water treatment of phenols is an important environmental problem. In this study, the hydrophobic polyethylene terephthalate track-etched membranes (PET TeMs) were tested in water treatment from phenol by direct contact membrane distillation (DCMD). Hydrophobic PET TeMs were obtained by UV-graft polymerization of styrene, triethoxyvinylsilane with the addition of vinylimidazole (VIM), as well as by coating with fluorine-containing silanes. Scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy and liquid entry pressure (LEP) analysis were used for membrane characterization. The contact angle after modification of PET TeMs was reached more than 130°. The efficiency of water purification from phenol was evaluated by water-flux measurements and fluorimetric method. The phenols solution was used at a concentration of 0.5, 1 and 2 g/l. The largest permeate flux of hydrophobized membranes was 1.1 kg/ m2•h.

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Section: Introductionmentioning

confidence: 99%

“…Substituting group 1 Н NMR, ppm, (J/Hz) 13 С NMR, ppm № R 1 R 2 СН-СН NH СН-СН С=О 1 [19] 5.24 7.16 (s. 4H) 64.60 160.30 10a [34,35] CH 10d [34] -CH 2 CH 2 CH 2 CH 2 -7.00 (s. 4Н) 73.60 160.30 10e [34,35] C 6 H 5 C 6 H 5 7.80 (s. 4Н) 81.70 160.60 10f [35] 3-ClC 6 H 4 3-ClC 6 H 4 7.98 (s. 4Н) 81.30 160.40 10g [35] 4-ClC 6 H 4 4-ClC 6 H 4 7.88 (s. 4Н) 81.20 160.30 10h [36] CF 3 CF 3 8.83 (s. 4Н) 77.11 158.27 11a [34,37] CH 11c [34,37] C 6 H 5 C 6 H 5 -79.00 158.00 11d [38] - C,N-Substituted glycolurils. In considering particular cases -compounds 12a-k (Table 9) and 13a-r (Table 10) with a mixed type of N-and C-substitution the 13 C NMR spectra are the most informative for the analysis of electronic properties and conformational changes in the glycoluril framework.…”

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confidence: 99%

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2020

Bull. of the Kar. Univ. "Chem". Ser.

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The use of differential calculation methods for the destruction of copolymers of polyethylene glycol fumarate with the acrylic acid In this work, the thermal decomposition of copolymers based on polyethylene glycol fumarate with the acrylic acid using various ratios of initial monomers has been studied for the first time. The samples were studied in air and nitrogen. According to the thermograms analysis, it was found that the copolymer sample decomposition begins at higher temperatures for a copolymer with high content of polyester resin. The copolymer is vigorously oxidized by the oxygen when heated in air, and one can observe almost complete sample decomposition, whereas it decomposes with a residue of ~15 % in an inert medium. The activation energies for copolymers with different compositions were estimated using the differential methods of Freeman-Carroll, Achar and Sharpe-Wentworth. The activation energy values found by the three methods demonstrated a good convergence. It was shown that, the activation energy values are higher (~200 kJ/mol in the inert medium, and ~95 kJ/mol in the oxygen atmosphere) for a copolymer with a lower composition of polyester resin, and the activation energy is ~180 and ~85 kJ/mol for a copolymer with a greater composition of p-EGF-AA. The copolymer is more thermostable in the nitrogen atmosphere according to the kinetic parameters. Additionally, there were determined the thermodynamic characteristics, such as the Gibbs energy (∆G) and the entropy (∆S). They also confirm the destruction process dependence on the components ratio in the synthesized copolymer.

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Evolution of morphology, structure, and magnetic parameters of Ni nanotubes with growth in pores of a PET template

Cited by 19 publications

References 22 publications

Investigation of the Structural Changes and Catalytic Properties of FeNi Nanostructures as a Result of Exposure to Gamma Radiation

Investigation of the Structural Changes and Catalytic Properties of FeNi Nanostructures as a Result of Exposure to Gamma Radiation

Phenol solutions treatment by using hydrophobized track-etched membranes

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