Центральная Научная Библиотека УрО РАН

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   T 44


    The effect of super- and nanodispersed powders of zinc and copper alloys in plastic greases on the structure and triboengineering properties of steel surfaces / L. V. Zolotukhina, A. Ya. Zapevalov, S. V. Zhidovinova, I. G. Arefiev, B. R. Gelchinsky // Journal of Friction and Wear. - 2011. - Vol.32, №2. - С. 107-112

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
LUBRICATING COMPOSITIONS -- TRIBOENGINEERING PROPERTIES -- STEEL SURFACES
Аннотация: It is demonstrated that the wear rate of tribocouples can be reduced significantly with the use of lubricating compositions obtained by added super- and nanodispersed zinc or Cu-Sn powders to the Lithol-24 plastic grease. When the superdispersed powders of copper alloys interact with tribosurfaces, the copper and tin diffuse into the base metal, producing secondary composite superdispersed structures. The alloyed elements penetrate into the base metal more deeply if the powder contains the nanodispersed fraction. The films of polyfluorinated oligomers based on particles of zinc and copper alloy powders with functional substitutes reduce substantially the friction coefficient of kinematic couples when they are lubricated with these lubricating compositions and expand the temperature range of application of plastic greases

\\\\Expert2\\nbo\\Journal of Friction and Wear\\2011, v. 32, p. 107-112.pdf
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   H 99


    Hydrophilic nature and sorption—diffusion properties [Electronic resource] / A. I. Suvorova, A. L. Suvorov, I. S. Tyukova, N. N. Malysheva, A. V. Okhokhonin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2013. - Vol. 61, №3. - С. 555-562. - Bibliogr. : p. 562 (34 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
POLYSULFONE -- SILICA -- SOL—GEL PROCESS
Аннотация: Hybrid nanocomposite films containing silica (11.4 wt.%) or titania (18.8 wt.%) in the polymer matrix were prepared by the sol—gel method using the hydrolytic polycondensation of tetraethoxysilane and tetrabutoxysilane in a THF solution of aromatic polymer, polysulfone (PSF). The influence of the oxide nature and the film composition on the structure, the interaction of the polymer with oxides, hydrophilicity, and sorption—diffusion properties of the hybrid films were studied by FTIR spectroscopy, atomic force microscopy, dynamic light scattering, and a complex of other physicochemical methods. The absence of chemical or intermolecular hydrogen bonds between the polymer and oxide particles in the PSF films was shown. The average size of the oxides (SiO2, 20 nm; TiO2, ~90 nm) in the films and roughness of their surface (~0.2—0.8 nm) were determined. The introduction of oxides into the polymer matrix increases the hydrophilic properties and the ability of the PSF films to swell in water; the diffusion coefficients of water and permeability of water vapor in the PSF films also increase. Titania also induces a more considerable change in the structure of the polymer matrix and more strongly affects the sorption—diffusion properties of the hybrid films in aqueous solutions of THF. All prepared nanocomposite films PSF/SiO2 and PSF/TiO2 are capable of extracting an organic component from aqueous solutions and can be used as sorbents and membrane films for the removal of organic substances from the aqueous medium

\\\\expert2\\NBO\\Russian Chemical Bulletin\\2012, 61 (3), 555-562.pdf
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   E 97


    Extended cavity pyrene-based iptycenes for the turn-off fluorescence detection of RDX and common nitroaromatic explosives / A. F. Khasanov [et al.] // New Journal of Chemistry. - 2017. - Vol. 41, № 6. - P2309-2320

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
PYRENE (CHEMICAL) -- FLUORESCENCE -- RDX (CYCLONITE)
Аннотация: Extended cavity pyrene-based iptycenes have been synthesized by using the Diels–Alder reaction between in situ generated dehydropyrenes and anthracene. The photophysical properties and the interaction of these iptycenes with nitro-explosive components were studied both in solution and in the solid state by using fluorescence spectroscopy and X-ray crystallography, respectively. Due to the presence of both the large iptycene cavity and the central pyrene core, an unprecedently high fluorescence-quenching response towards non-aromatic and non-planar 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) has been observed both in solution (with an apparent Stern–Volmer constant value aKSV up to 1.53 × 103 M−1) and in the vapor phase (50–75% fluorescence quenching of the PU films doped with chemosensors). In the case of nitroaromatic explosives, nitrobenzene (NB), 2,4-DNT, TNT, and 2,4,6-trinitrophenol (TNP or picric acid, PA), pyrene-based iptycenes also demonstrate a good fluorescence-quenching response both in solutions (with apparent Stern–Volmer constant values aKSV = 0.4–8.0 × 103 M−1) and in the vapor phase (up to 90% fluorescence quenching of the PU films doped with chemosensors). The “sphere of action” fluorescence quenching model was suggested.

\\\\Expert2\\NBO\\New Journal of Chemistry\\2017 v.41 p.2309-2320.pdf
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   M 60

    Meshcherskikh, A. N.
    HFO2-based films preparation by chemical solution deposition / A. N. Meshcherskikh, L. A. Dunushkina, L. N. Maskaeva // Современные синтетические методологии для создания лекарственных препаратов и функциональных материалов (MOSM2018): вторая международная научно-практическая конференция : материалы и доклады. - Екатеринбург, 2019. - С. 121

ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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    Benzo[ b]selenophene/thieno[3,2-b]indole-based n,s,se-heteroacenes for hole-transporting layers / M. S. Demina, N. A. Rasputin, R. A. Irgashev [и др.] // ACS omega. - 2020. - № 5. - С. 9377-9383
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Two series of new N,S,Se-heteroacenes, namely, 6H-benzo[4′,5′]selenopheno[2′,3′:4,5]thieno[3,2-b]indoles and 12H-benzo[4″,5″]selenopheno[2″,3″:4′,5′]thieno[2′,3′4,5]thieno[3,2-b]indoles, were successfully obtained using an effective strategy based on Fiesselmann thiophene and Fischer indole synthesis. The new molecules exhibit a large optical band gap (2.82 eV Egopt 3.23 eV) and their highest occupied molecular orbital (HOMO) energy formed by the plane Ï-core ranges between-5.2 and-5.6 eV, with the narrower optical band gap and lower HOMO level corresponding to selenated heteroacenes. In thin solid films of the heteroacenes, hole mobility measured using the conventional CELIV technique ranges between 10-5 and 10-4 cm2·V-1·s-1. All these make the proposed condensed-ring compounds a promising platform for the development of hole-transporting materials applicable in organic electronics.

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    Dibenzo[ f,h]furazano[3,4- b]quinoxalines: synthesis by intramolecular cyclization through direct transition metal-free c-h functionalization and electrochemical, photophysical, and charge mobility characterization / Y. A. Kvashnin, E. V. Verbitskiy, P. A. Slepukhin [et al.] // ACS omega. - 2020. - Vol. 5, № 14. - P8200-8210
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Herein, we describe the synthesis of unsymmetrically substituted dibenzo[f,h]furazano[3,4-b]quinoxalines by intramolecular cyclization through direct transition metal-free C-H functionalization. The electrochemical and photophysical properties for several polycycles have been measured. In thin films of the dibenzo[f,h]furazano[3,4-b]quinoxalines, hole mobility is in the order of 10-4 cm2 V-1 s-1. The results show that the HOMO and LUMO energy levels are appropriate for using the compounds as hole-transport materials in thin-film devices, in particular, organic and perovskite solar cells.

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    Influence of single-wall carbon nanotube suspension on the mechanical properties of polymeric films and electrospun scaffolds / A. A. Dokuchaeva, S. V. Vladimirov, V. P. Borodin [et al.] // International journal of molecular sciences. - 2023. - Vol. 24, № 13. - P11092
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
BIOENGINEERING -- CARBON NANOTUBES -- TUBULAR SCAFFOLDS
Аннотация: Carbon nanotubes (CNTs) are used in applications ranging from electrical engineering to medical device manufacturing. It is well known that the addition of nanotubes can influence the mechanical properties of various industrial materials, including plastics. Electrospinning is a popular method for fabricating nanomaterials, widely suggested for polymer scaffold manufacturing. In this study, we aimed to describe the influence of single-walled carbon nanotube (SWCNT) suspensions on polymeric poured films and electrospun scaffolds and to investigate their structural and mechanical properties obtained from various compositions. To obtain films and electrospun scaffolds of 8 mm diameter, we used poly-ε-caprolactone (PCL) and poly(cyclohexene carbonate) (PCHC) solutions containing several mass fractions of SWCNT. The samples were characterized using tensile tests, atomic force and scanning electronic microscopy (AFM and SEM). All the studied SWCNT concentrations were shown to decrease the extensibility and strength of electrospun scaffolds, so SWCNT use was considered unsuitable for this technique. The 0.01% mass fraction of SWCNT in PCL films increased the polymer strength, while fractions of 0.03% and more significantly decreased the polymer strength and extensibility compared to the undoped polymer. The PHCH polymeric films showed a similar behavior with an extremum at 0.02% concentration for strength at break.

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