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Fabrication of Extremely Concentrated Silver Hydrosols without Additional Stabilizers / S. A. Vorobyev, M. N. Likhatski, A. S. Romanchenko [et al.] // ACS Sustain. Chem. Eng. - 2020. - Vol. 8, Is. 46. - P. 17225-17233, DOI 10.1021/acssuschemeng.0c06006. - Cited References: 64. - This research was supported by the Russian Science Foundation, grant 18-73-00142 (S.A.V.). We acknowledge that facilities of the Krasnoyarsk Regional Research Equipment Centre of SB RAS were employed in the work . - ISSN 2168-0485
Кл.слова (ненормированные):
silver nanoparticles -- Carey Lea colloid -- dense hydrosols -- synthesis -- dynamic light scattering -- hydrophilic surfaces
Аннотация: Applications of silver nanoparticles (Ag NPs) in modern technologies require environmentally friendly methods of large-scale production of the nanoparticles with controlled morphology and surface state in the form of high-concentration metal sols with minimal quantities of organic stabilizers. Herein, we report a procedure based on reduction of aqueous silver nitrate with ferrous sulfate in the presence of citrate ions. We studied the effect of various factors on the chemical reaction by applying transmission electron microscopy, ultraviolet-visible absorption spectroscopy, and dynamic light scattering (DLS) and proposed protocols with reduced quantities of the reagents allowing preparation of uniform spherical Ag NPs of 5 to 15 nm in diameter. A DLS study of sols after dilution was employed to estimate the tendency of colloidal particles to interact in order to optimize post-synthetic purification and concentration procedures. Particularly, filtration instead of centrifugation and electrolytic coagulation with trisodium citrate in place of sodium nitrate were utilized to produce extremely concentrated, more than 1000 g/L Ag, and stable silver hydrosols with no additional stabilizers. The chemical, X-ray photoelectron spectroscopy, and thermogravimetric analyses demonstrated that the Ag NPs contained citrate-derived capping ligands, and low amounts of Fe are appropriated for chemical and low-temperature sintering, surface functionalization, nanofluidics, and other applications.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/24, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, 31, Krasnoyarsky Rabochy Av., Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Vorobyev, S. A.; Likhatski, M. N.; Romanchenko, A. S.; Fetisova, O. Y.; Kazachenko, A. S.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Mikhlin, Y. L.; Михлин, Юрий Леонидович
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Analysis of function of copper sulfide nanoparticles as sphalerite flotation activator / S. A. Vorob’ev, E. A. Burdakova, A. A. Sarycheva [et al.] // J. Min. Sci. - 2021. - Vol. 57, Is. 1. - P. 144-153, DOI 10.1134/S1062739121010154. - Cited References: 22. - This study was supported by the Russian Science Foundation, project no. 18-17-00135 . - ISSN 1062-7391
Кл.слова (ненормированные):
nanoparticles -- copper sulfide -- flotation -- sphalerite -- activators -- dynamic light scattering -- X-ray photoelectron spectroscopy
Аннотация: The authors compare the effect exerted by copper ions and sulphide copper nanoparticles on flotation of Gorevka deposit sphalerite using potassium n-butyl xanthate and in reagent-less regime. Covelline-like colloid particles 4–8 nm in size, obtained in interaction of copper (II) and sulfide ions in aqueous solutions, are characterized using the methods of dynamic light scattering, electron microscopy and diffraction. Sphalerite surface after reaction with copper ions and CuS dispersoid solutions are described by zeta-potential measurements and X-ray photoelectron spectroscopy. It is found that sphalerite flotation after activation with nanoparticles is lower than with copper ion solutions of the same concentrations, and improves with increasing duration of activation and flotation processes. The mechanism of CuS nanoparticles consists in creation of active centers for the collector to attach to, which intensifies the hydrophobic behavior and adsorption of the collector. Moreover, CuS nanoparticles promote formation of a special microrelief of the solid–liquid interface, which ensures rupture of liquid film and attachment of sphalerite particles to air bubbles when they collide.

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Публикация на русском языке Изучение действия наночастиц сульфида меди как активатора флотации сфалерита [Текст] / С. А. Воробьев, Е. А. Бурдакова, И. В. Сарычева [и др.] // Физ.-техн. проблемы разраб. полез. ископаемых. - 2021. - № 1. - С. 159-168

Держатели документа:
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Vorob’ev, S. A.; Burdakova, E. A.; Sarycheva, A. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Karacharov, A. A.; Likhatskii, M. N.; Mikhlin, Y. L.
}
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Synthesizing zinc sulfide films on the gold surface as the sensor for electrochemical quartz crystal microbalance / D. O. Krinitsyn, A. S. Romanchenko, S. A. Vorob'ev [et al.] // Russ. J. Electrochem. - 2021. - Vol. 57, Is. 12. - P. 1157-1163, DOI 10.1134/S1023193521120041. - Cited References: 23. - The study was supported by the Russian Scientific Foundation (grant no. 18-17-00135) . - ISSN 1023-1935. - ISSN 1608-3342

РУБ Electrochemistry
Рубрики:
CHEMICAL BATH DEPOSITION
   ZNS
   SPHALERITE
   ELECTRODES
   ACTIVATION
Кл.слова (ненормированные):
sphalerite -- thin films -- hydrochemical deposition -- electrochemistry -- quartz crystal microbalance -- dynamic light scattering -- gold -- spectroscopy
Аннотация: A zinc sulfate film is deposited from aqueous solutions of zinc sulfate onto the gold surface with the aim of preparation of a sensor for electrochemical quartz crystal microbalance (EQCM). The kinetics of this process, the particles formed in solution, and the film itself are studied by the methods of electrochemical quartz crystal microbalance, X-ray photoelectron spectroscopy, transmission electron microscopy, atomic force microscopy, optical and Raman spectroscopies, and dynamic light scattering. The effect of the procedure of gold surface preparation, the reagent concentration, and the temperature on the film adhesion, the length of induction period, the kinetics of film growth, and its structure and thickness are studied. It is shown that the film formation proceeds as a result of deposition of sufficiently coarse 200-700 nm colloid particles of sphalerite. It is demonstrated that this sensor can be used in studying the electrochemical reactions of ZnS and the interface phenomena by the methods of EQCM and cyclic voltammetry.

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Публикация на русском языке Получение пленок сульфида цинка на поверхности золота как сенсора электрохимического кварцевого микробаланса / Д. О. Криницын, А. С. Романченко, С. А. Воробьев [и др.] // Электрохим. - 2021. - Т. 57 № 12. - С. 762-768

Держатели документа:
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.
Russian Acad Sci, Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk, Russia.

Доп.точки доступа:
Krinitsyn, D. O.; Romanchenko, A. S.; Vorob'ev, S. A.; Likhatskii, M. N.; Karacharov, A. A.; Krylov, A. S.; Крылов, Александр Сергеевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Mikhlin, Yu L.; Russian Scientific FoundationRussian Science Foundation (RSF) [18-17-00135]
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Characterizing aptamer interaction with the oncolytic virus VV-GMCSF-Lact / M. A. Dymova, D. O. Malysheva, V. K. Popova [et al.] // Molecules. - 2024. - Vol. 29, Is. 4. - Ст. 848, DOI 10.3390/molecules29040848. - Cited References: 46. - This study was supported by the Russian Science Foundation grant No. 22-64-00041, available online: https://rscf.ru/en/project/22-64-00041/ (accessed on 6 February 2024). This work was supported by the Russian state-funded project for ICBFM SB RAS (grant number 121030200173-6) . - ISSN 1420-3049
Кл.слова (ненормированные):
aptamer -- oncolytic virus -- glioma -- dynamic light scattering -- microscale thermophoresis
Аннотация: Aptamers are currently being investigated for their potential to improve virotherapy. They offer several advantages, including the ability to prevent the aggregation of viral particles, enhance target specificity, and protect against the neutralizing effects of antibodies. The purpose of this study was to comprehensively investigate an aptamer capable of enhancing virotherapy. This involved characterizing the previously selected aptamer for vaccinia virus (VACV), evaluating the aggregation and molecular interaction of the optimized aptamers with the recombinant oncolytic virus VV-GMCSF-Lact, and estimating their immunoshielding properties in the presence of human blood serum. We chose one optimized aptamer, NV14t_56, with the highest affinity to the virus from the pool of several truncated aptamers and built its 3D model. The NV14t_56 remained stable in human blood serum for 1 h and bound to VV-GMCSF-Lact in the micromolar range (Kd ≈ 0.35 μM). Based on dynamic light scattering data, it has been demonstrated that aptamers surround viral particles and inhibit aggregate formation. In the presence of serum, the hydrodynamic diameter (by intensity) of the aptamer–virus complex did not change. Microscale thermophoresis (MST) experiments showed that NV14t_56 binds with virus (EC50 = 1.487 × 109 PFU/mL). The analysis of the amplitudes of MST curves reveals that the components of the serum bind to the aptamer–virus complex without disrupting it. In vitro experiments demonstrated the efficacy of VV-GMCSF-Lact in conjunction with the aptamer when exposed to human blood serum in the absence of neutralizing antibodies (Nabs). Thus, NV14t_56 has the ability to inhibit virus aggregation, allowing VV-GMCSF-Lact to maintain its effectiveness throughout the storage period and subsequent use. When employing aptamers as protective agents for oncolytic viruses, the presence of neutralizing antibodies should be taken into account.

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Держатели документа:
Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Lavrentiev av. 8, 630090 Novosibirsk, Russia
Department of Natural Sciences, Novosibirsk State University, Pirogova str. 1, 630090 Novosibirsk, Russia
State Research Center of Virology and Biotechnology “Vector”, 630559 Koltsovo, Russia
Laboratory for Biomolecular and Medical Technologies, Krasnoyarsk State Medical University Named after Prof. V.F. Voyno-Yasenetsky, Partizana Zheleznyaka str. 1, 660022 Krasnoyarsk, Russia
Federal Research Center KSC SB RAS, 50 Akademgorodok, 660036 Krasnoyarsk, Russia
Kirensky Institute of Physics, 50/38 Akademgorodok, 660012 Krasnoyarsk, Russia

Доп.точки доступа:
Dymova, M. A.; Malysheva, D. O.; Popova, V. K.; Dmitrienko, E. V.; Endutkin, A. V.; Drokov, D. V.; Mukhanov, V. S.; Byvakina, A. A.; Kochneva, G. V.; Artyushenko, P. V.; Shchugoreva, I. A.; Rogova, A. V.; Tomilin, F. N.; Томилин, Феликс Николаевич; Kichkailo, A. S.; Richter, V. A.; Kuligina, E. V.
}
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