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Droplet Spreading and Wettability of Abrasive Processed Aluminum Alloy Surfaces
G. V. Kuznetsov,E. G. Orlova,D. V. Feoktistov,A. G. Islamova,A. V. Zhuikov 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.1
One of the main cause of a droplet metastable state is found to be surface roughness. This state is characterized by a largecontact angle hysteresis and condition when the static contact angle is larger than the advancing dynamic contact angle. Besides the texture, other factors can influence the deviation from the equilibrium state, in particular, the fluid flow rate (thegrowth rate of a droplet) affecting the contact line speed. An experimental study was done to determine the effect of roughnessand fluid flow rate on wetting of aluminum-magnesium alloy surfaces with random roughness processed by abrasivepolishing. Three-dimensional roughness parameters were used to evaluate their texture. The correlations between theseparameters, static, advancing and receding dynamic contact angles, hysteresis, and contact line speed were obtained. Themolecular-kinetic theory of wetting was used to interpret the dynamic contact angle data.
Photoluminescence of porous silicon coated by SILD method with LaF3nanolayers
Y.S. Milovanov,V.A. Skryshevsky,V.P. Tolstoy,L.B. Gulina,I.V. Gavrilchenko,G.V. Kuznetsov 한국물리학회 2013 Current Applied Physics Vol.13 No.8
The method of lanthanum fluoride passivating layer synthesis in the matrix of porous silicon by successive ionic layer deposition was elaborated and optimized. Luminescence and FTIR of obtained structures demonstrate the crucial role of the chemical composition of silicon nanocrystallite surface in the formation of radiative recombination channels and in the stability of porous silicon photoluminescence. The combination of high optical transparency of LaF3 layers and low recombination losses in silicon covered with such layers allows to recommend the lanthanum fluoride film as an effective passivating coating for silicon optoelectronics devices.
Evidence for a narrow structure at W∼1.68 GeV in η photoproduction off the neutron
Kuznetsov, V.,Churikova, S.,Gervino, G.,Ghio, F.,Girolami, B.,Ivanov, D.,Jang, J.,Kim, A.,Kim, W.,Ni, A.,Vorobiev, Yu.,Yurov, M.,Zabrodin, A. North-Holland Pub. Co 2007 Physics letters: B Vol.647 No.1
New results on quasi-free η photoproduction on the neutron and proton bound in a deuteron target are presented. The γn->ηn quasi-free cross section reveals a bump-like structure which is not seen in the cross section on the proton. This structure may signal the existence of a relatively narrow (M∼1.68 GeV, Γ=<30 MeV) baryon state.
Characterization of Graphene Oxide Suspension for Fluorescence Quenching in DNA-Diagnostics
Kapitonov, A.N.,Alexandrov, G.N.,Vasileva, F.D.,Smagulova, S.A.,Timofeev, V.B.,Maksimova, N.R.,Kuznetsov, A.A. Materials Research Society of Korea 2016 한국재료학회지 Vol.26 No.1
The graphene oxides (GOs) were tested as a fluorescent quencher in the field of DNA-diagnostics. The various suspensions of GO nanoplates were prepared by changing the synthesis conditions. The suspensions were stable for at least 6 weeks by differing degrees of functionalization of various oxygen-containing groups of atoms. Depending on the properties of GO nanoplates, their fluorescent quenching abilities, which were determined by the amount of the tagged immobilized oligonucleotide, were also changed. GO suspension synthesized at $75^{\circ}C$ of reaction mixture showed the fluorescent quenching of 16.39 nmol/mg, which would be a potential substitution of molecular fluorescent quencher in test-systems for DNA-diagnostics.
Laser amplification in Yb:YAG thin rods of different geometries: simulation and experiment
Lee, B.,Chizhov, S. A.,Sall, E. G.,Kim, J. W.,Kuznetsov, I. I.,Mukhin, I. B.,Palashov, O. V.,Kim, G. H.,Yashin, V. E.,Vadimova, O. L. The Optical Society 2018 Journal of the Optical Society of America. B, Opti Vol.35 No.10
Study of Catalysts for Catalytic Burners for Fuel Cell Power Plant Reformers
Ismagilov, Zinfer R.,Kerzhentsev, Mikhail A.,Sazonov, Vladimir A.,Tsykoza, Lidia T.,Shikina, Nadezhda V.,Kuznetsov, Vadim V.,Ushakov, Vladimir A.,Mishania, Sergey V.,Kozhukhar, Nikolay G.,Russo, Genna 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.3
Catalytic burners for fuel cell power plant reformers are alternatives to conventional flame burners. Their application is expected to provide uniform temperatures in the reformer, efficient use of low-calorific gaseous byproducts and reduction of pollutant emissions. For testing in the burners, a series of spherical Pd/CeO_2/Al_2O_3 catalysts were prepared. An optimum concentration of ceria providing the highest thermal stability of catalysts was determined. An effect of catalyst activation in the reaction mixture-1% methane in air was observed. A series of Mn containing oxide catalysts on spherical y-Al_2O_3 or (y+x)-Al_2O_3, both pure and doped with La, Ce and Mg oxides were prepared. The catalysts were characterized by chemical analysis, X-ray phase analysis, BET surface area and activity measurements in methane oxidation. A batch of Mn-Mg_La-Al-O catalyst was prepared for further long-term testing in a model reformer with a catalytic burner. A model reformer with a catalytic burner was designed and fabricated for testing in the composition of the bench-scale Fuel Cell Power Plant, Preliminary testing of this catalyst showed that it provided complete methane combustion an the specified operational temperatures over 900℃.