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ELECTROPHORETIC BEHAVIOR OF HYDROSOLS OF ULTRADISPERSE DIAMOND AND MODIFICATION OF ITS SURFACE [Text] / G. A. CHIGANOVA, V. A. BONDAR, A. S. CHIGANOV // COLLOID JOURNAL OF THE RUSSIAN ACADEMY OF SCIENCES. - 1993. - Vol. 55, Is. 5. - P. 774-775. - Cited References: 5 . - ISSN 1061-933X

РУБ Chemistry, Physical

Аннотация: The method of macro-electrophoresis is used to determine values of the zeta-potential of particles of ultradisperse diamond in solutions of AlCl3. It is shown that an increase in the concentration of aluminum ions to 0.5.10(-4) M leads to a decrease in the negative charge of the diamond particles; the dispersions coagulate in more concentrated solutions of AlCl3. Chemical modification of the surface of ultradisperse diamond by aluminum ions is used to obtain stable hydrosols with positively charged diamond particles.

WOS : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
CHIGANOVA, G.A.; BONDAR, V.A.; CHIGANOV, A.S.

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Saturable absorption in detonation nanodiamond dispersions / V. Vanyukov [et al.] // J. Nanophoton. - 2017. - Vol. 11, Is. 3, DOI 10.1117/1.JNP.11.032506 . - ISSN 1934-2608
Кл.слова (ненормированные):
Modelocking -- Nanodiamonds -- Nanomaterials -- Nonlinear optics -- Saturable absorption -- Carbon -- Chains -- Dispersion (waves) -- Electromagnetic wave absorption -- Laser excitation -- Laser pulses -- Light -- Light absorption -- Locks (fasteners) -- Nanostructured materials -- Nonlinear optics -- Ultrafast lasers -- Ultrashort pulses -- Yarn -- Aqueous dispersions -- Detonation nanodiamond -- Light-induced -- Modelocking -- Nano-diamond particles -- Non-linear parameters -- Saturable absorption -- Z-scan experiment -- Nanodiamonds
Аннотация: We report on a saturable absorption in aqueous dispersions of nanodiamonds with femtosecond laser pulse excitation at a wavelength of 795 nm. The open aperture Z-scan experiments reveal that in a wide range of nanodiamond particle sizes and concentrations, a lightinduced increase of transmittance occurs. The transmittance increase originates from the saturation of light absorption and is associated with a light absorption at 1.5 eV by graphite and dimer chains (Pandey dimer chains). The obtained key nonlinear parameters of nanodiamond dispersions are compared with those of graphene and carbon nanotubes, which are widely used for the mode-locking. © 2017 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Держатели документа:
Institute of Photonics, University of Eastern Finland, Joensuu, Finland
Hypermemo Ltd., Joensuu, Finland
Institute of Mechanics, Russian Academy of Sciences, Izhevsk, Russian Federation
Federal research center Krasnoyarsk science Center SB RAS, Siberian Branch of RAS, Institute of Biophysics, Krasnoyarsk, Russian Federation
Texas State University, San Marcos, TX, United States
CIC nanoGUNE Consolider, Donostia-San Sebastian, Spain
G Basque Foundation for Science, Ikerbasque, Bilbao, Spain

Доп.точки доступа:
Vanyukov, V.; Mikheev, G.; Mogileva, T.; Puzyr, A.; Bondar, V.; Lyashenko, D.; Chuvilin, A.

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The effect of silver ions electrolytically introduced into colloidal nanodiamond solution on its viscosity and thermal conductivity / A. P. Puzir’ [et al.] // Colloid J. - 2017. - Vol. 79, Is. 2. - P258-263, DOI 10.1134/S1061933X17020119 . - ISSN 1061-933X
Кл.слова (ненормированные):
Dispersions -- Ions -- Metal ions -- Nanodiamonds -- Nanoparticles -- Silver -- Viscosity -- A-stable -- Detonation nanodiamond -- Diamond nano-particles -- Effect of silvers -- Silver concentration -- Silver ions -- Thermal conductivity
Аннотация: Experimental data have been presented on the influence of silver on the viscosity and thermal conductivity of a dispersion of diamond nanoparticles. A stable dispersion (5 wt %) of detonation nanodiamond particles has been used in the experiments. Silver ions have been introduced electrolytically into the dispersion of diamond nanoparticles. Silver concentration was not higher than 0.05 wt %. It has been shown that the introduction of silver ions significantly affects the thermal conductivity and viscosity of the dispersion. © 2017, Pleiades Publishing, Ltd.

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Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, ul. Akademgorodok 50/50, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodnyi pr. 79., Krasnoyarsk, Russian Federation
Special Design and Technology Bureau Nauka, Institute of Computational Technologies, Siberian Branch, Russian Academy of Sciences, pr. Mira 53, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, ul. Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, ul. Akademgorodok 50/24, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Puzir’, A. P.; Minakov, A. V.; Burov, A. E.; Zharkov, S. M.; Maksimov, N. G.; Pryazhnikov, M. I.

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Effects of modified magnetite nanoparticles on bacterial cells and enzyme reactions / L. S. Bondarenko, E. S. Kovel, K. A. Kydralieva [et al.] // Nanomaterials. - 2020. - Vol. 10, Is. 8. - Ст. 1499. - P1-20, DOI 10.3390/nano10081499 . - ISSN 2079-4991
Кл.слова (ненормированные):
Bacterial assay -- Bioluminescence -- Enzymatic assay -- Humic acids-coated magnetite nanoparticles -- Hydrodynamic diameter -- Luciferase -- Magnetite nanoparticles -- NADH:FMN-oxidoreductase -- Oxidative stress -- Photobacterium phosphoreum -- Silica-coated magnetite nanoparticles -- Toxicity -- Zeta potential
Аннотация: Current paper presents biological effects of magnetite nanoparticles (MNPs). Analyzing effects of MNP’ characteristics (zeta-potential and hydrodynamic diameters) on bacteria and their enzyme reactions was the main focus. Photobacterium phosphoreum and bacterial enzymatic reactions were chosen as bioassays. Three types of MNPs were under study: bare Fe3O4, Fe3O4 modified with 3-aminopropyltriethoxysilane (Fe3O4/APTES), and humic acids (Fe3O4/HA). Effects of the MNPs were studied at a low concentration range (< 2 mg/L) and attributed to availability and oxidative activity of Fe3+, high negative surface charge, and low hydrodynamic diameter of Fe3O4/HA, as well as higher Fe3+ content in suspensions of Fe3O4/HA. Low-concentration suspensions of bare Fe3O4 provided inhibitory effects in both bacterial and enzymatic bioassays, whereas the MNPs with modified surface (Fe3O4/APTES and Fe3O4/HA) did not affect the enzymatic activity. Under oxidative stress (i.e., in the solutions of model oxidizer, 1,4-benzoquinone), MNPs did not reveal antioxidant activity, moreover, Fe3O4/HA demonstrated additional inhibitory activity. The study contributes to the deeper understanding of a role of humic substances and silica in biogeochemical cycling of iron. Bioluminescence assays, cellular and enzymatic, can serve as convenient tools to evaluate bioavailability of Fe3+ in natural dispersions of iron-containing nanoparticles, e.g., magnetite, ferrihydrite, etc. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

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Держатели документа:
Moscow Aviation Institute (National Research University), Moscow, 125993, Russian Federation
Institute of Physics SB RAS, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Biophysics SB RAS, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Problems of Chemical Physics RAS, Moscow Region, Chernogolovka, 142432, Russian Federation
University of Szeged, Szeged, H-6720, Hungary
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Bondarenko, L. S.; Kovel, E. S.; Kydralieva, K. A.; Dzhardimalieva, G. I.; Illes, E.; Tombacz, E.; Kicheeva, A. G.; Kudryasheva, N. S.

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Effects of Modified Magnetite Nanoparticles on Bacterial Cells and Enzyme Reactions / L. S. Bondarenko, E. S. Kovel, K. A. Kydralieva [et al.] // Nanomaterials. - 2020. - Vol. 10, Is. 8. - Ст. 1499, DOI 10.3390/nano10081499. - Cited References:83. - This research was funded by the Russian Foundation for Basic Research (#19-315-50048, #19-33-90149, and #18-29-19003). . - ISSN 2079-4991

РУБ Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
NATURAL ORGANIC-MATTER
HUMIC-ACID
DETOXIFICATION PROCESSES
Кл.слова (ненормированные):
magnetite nanoparticles -- humic acids-coated magnetite nanoparticles -- silica-coated magnetite nanoparticles -- zeta potential -- hydrodynamic -- diameter -- toxicity -- bioluminescence -- bacterial assay -- enzymatic assay -- oxidative stress -- Photobacterium phosphoreum -- NADH -- FMN-oxidoreductase -- luciferase
Аннотация: Current paper presents biological effects of magnetite nanoparticles (MNPs). Relations of MNP' characteristics (zeta-potential and hydrodynamic diameters) with effects on bacteria and their enzymatic reactions were the main focus.Photobacterium phosphoreumand bacterial enzymatic reactions were chosen as bioassays. Three types of MNPs were under study: bare Fe3O4, Fe(3)O(4)modified with 3-aminopropyltriethoxysilane (Fe3O4/APTES), and humic acids (Fe3O4/HA). Effects of the MNPs were studied at a low concentration range (< 2 mg/L) and attributed to availability and oxidative activity of Fe3+, high negative surface charge, and low hydrodynamic diameter of Fe3O4/HA, as well as higher Fe(3+)content in suspensions of Fe3O4/HA. Low-concentration suspensions of bare Fe(3)O(4)provided inhibitory effects in both bacterial and enzymatic bioassays, whereas the MNPs with modified surface (Fe3O4/APTES and Fe3O4/HA) did not affect the enzymatic activity. Under oxidative stress (i.e., in the solutions of model oxidizer, 1,4-benzoquinone), MNPs did not reveal antioxidant activity, moreover, Fe3O4/HA demonstrated additional inhibitory activity. The study contributes to the deeper understanding of a role of humic substances and silica in biogeochemical cycling of iron. Bioluminescence assays, cellular and enzymatic, can serve as convenient tools to evaluate bioavailability of Fe(3+)in natural dispersions of iron-containing nanoparticles, e.g., magnetite, ferrihydrite, etc.

WOS
Держатели документа:
Natl Res Univ, Moscow Aviat Inst, Moscow 125993, Russia.
FRC KSC SB RAS, Inst Phys SB RAS, Krasnoyarsk 660036, Russia.
FRC KSC SB RAS, Inst Biophys SB RAS, Krasnoyarsk 660036, Russia.
RAS, Moscow Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia.
Univ Szeged, H-6720 Szeged, Hungary.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Bondarenko, Lyubov S.; Kovel, Ekaterina S.; Kydralieva, Kamila A.; Dzhardimalieva, Gulzhian, I; Illes, Erzsebet; Tombacz, Etelka; Kicheeva, Arina G.; Kudryasheva, Nadezhda S.; Dzhardimalieva, Gulzhian; Kudryasheva, Nadezhda; Kovel, Ekaterina; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-315-50048, 19-33-90149, 18-29-19003]

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Thermomechanical analysis of isora nanofibril incorporated polyethylene nanocomposites / C. Jose, C. H. Chan, T. Winie [et al.] // Polym. - 2021. - Vol. 13, Is. 2. - Ст. 299. - P1-15, DOI 10.3390/polym13020299 . - ISSN 2073-4360
Кл.слова (ненормированные):
Avrami model -- Crystallization -- Mechanical properties -- Polymer-cellulose nanocomposites -- Aliphatic compounds -- Cellulose nanocrystals -- Crystallization kinetics -- Fillers -- Nanocomposites -- Nanofibers -- Polyethylenes -- Viscoelasticity -- Application range -- Cellulose nanofibers -- Composite fabrication -- Physio-chemical properties -- Polyethylene nanocomposites -- Thermo-mechanical analysis -- Uniform dispersions -- Viscoelastic properties -- Cellulose -- Aliphatic Compounds -- Cellulose -- Crystallization -- Fillers -- Plants -- Polyethylene -- Thermoplastics -- Viscoelasticity
Аннотация: The research on cellulose fiber-reinforced nanocomposites has increased by an unprecedented magnitude over the past few years due to its wide application range and low production cost. However, the incompatibility between cellulose and most thermoplastics has raised significant challenges in composite fabrication. This paper addresses the behavior of plasma-modified polyethylene (PE) reinforced with cellulose nanofibers extracted from isora plants (i.e., isora nanofibrils (INFs)). The crystallization kinetics of PE–INF composites were explained using the Avrami model. The effect of cellulose nanofillers on tuning the physiochemical properties of the nanocomposite was also explored in this work. The increase in mechanical properties was due to the uniform dispersion of fillers in the PE. The investigation on viscoelastic properties confirmed good filler–matrix interactions, facilitating the stress transfer. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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Держатели документа:
Newman College, Thodupuzha, Kerala, 685585, India
Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam, 40450, Malaysia
International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala, 686560, India
School of Energy Materials, Mahatma Gandhi University, Kottayam, Kerala, 686560, India
School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala, 686560, India
Institute of Biophysics of the Siberian Branch of the Russian Academy of Sciences, Siberian Federal University, 79 Svobodnyi Av., Krasnoyarsk, 660041, Russian Federation
Dipartimento di Ingegneria, Universita di Palermo, Viale delle Scienze, Palermo, 90128, Italy
Consorzio INSTM, Firenze, 50121, Italy
Institut Jean Lamour, UMR 7198, CNRS, Universite de Lorraine, Vandoeuvre-les-Nancy, F-54500, France
Facolta di Ingegneria, Universita degli Studi di Enna “Kore”, Cittadella Universitaria, Enna, 94100, Italy
Instituto de Alta Investigacion Universidad de Tarapaca, Casilla 7D, Arica, 1000000, Chile

Доп.точки доступа:
Jose, C.; Chan, C. H.; Winie, T.; Joseph, B.; Tharayil, A.; Maria, H. J.; Volova, T.; Mantia, F. P.L.; Rouxel, D.; Morreale, M.; Laroze, D.; Mathew, L.; Thomas, S.

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