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Общее количество найденных документов : 38
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 1-10    11-20   21-30   31-38 
1.
Инвентарный номер: нет.
   
   С 71


   
    Спектральные проявления активных центров на поверхности наноразмерного оксида меди = Ftir study of the active centers on surface of ultrafine copper oxide [] / В. Г. Харчук, О. В. Корякова, Е. Ф. Хмара, М. А. Уймин // Аналитика и контроль. - 2005. - Т. 9, № 4. - С. 423-427. - Библиогр.: с. 427 (10 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Приводятся результаты ИК спектроскопического изучения активных центров нанокристаллических оксидов меди, основанного на выделении специфических взаимодействий молекул-зондов: H2O, CO2, NH3

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2.
Инвентарный номер: нет.
   
   M 38


   
    Mass transfer with chemical reaction in conditions of spontaneous interfacial convection in processes of liquid extraction [Text] / S. A. Ermakov, A. A. Ermakov, O. N. Chupakhin, D. V. Vaissov // Chemical Engineering Journal. - 2001. - Vol. 84, № 3. - P321-324
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The paper investigates mass transfer with a chemical reaction in conditions of spontaneous interfacial convection (Marangoni effect). It is shown that a chemical reaction changes the ratio of phase resistance, with the result that the balance of forces at the surface is disturbed and interfacial instability is initiated. The effect of the concentration and the surface activity of a transferred reagent on the conditions of initiation of interfacial instability and the intensity of interfacial convection has been investigated. The determining parameters are the ratio of phase resistances, the surface activity and the concentration of a transferred reagent

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3.
Инвентарный номер: нет.
   
   C 31


   
    Catalytic effect of nanosized metal oxides on the Hantzsch reaction [Text] / O. V. Fedorova, O. V. Koryakova, M. S. Valova, I. G. Ovchinnikova, Yu. A. Titova, G. L. Rusinov, V. N. Charushin // Kinetics and Catalysis. - 2010. - Vol. 51, № 4. - P566-572
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
METAL OXIDES -- HANTZSCH REACTION -- ALUMINUM OXIDES
Аннотация: The effect of nanosized copper and aluminum oxides, which have a higher sorption capacity than that of bulk samples, on the Hantzsch reaction was studied. The adsorption of starting benzaldehydes and ethyl acetoacetate on the surface of copper and aluminum nanooxides resulted in the activation of these molecules and accelerated the Hantzsch reaction. In addition, considerable activation of ammonia and intermediates (chalcone and enamine) on the surface of aluminum nanooxide facilitated an increase in the rate and selectivity of the process. The experimental results were used to develop a one-pot method for the preparation of nifedipine and nitrendipine

\\\\Expert2\\nbo\\Kinetics and Catalysis\\2010, v. 51, N 4, p. 566-572.pdf
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4.
Инвентарный номер: нет.
   
   I-70


   
    Investigation of the structure of chitosan hybrid systems by pH-sensitive nitroxyl radical [Electronic resource] / A. V. Mekhaev, A. V. Pestov, L. S. Molochnikov, E. G. Kovaleva, Yu. G. Yatluk, I. A. Grigor'ev, I. A. Kirilyuk // Russian Journal of Physical Chemistry A, Focus on Chemistry. - 2011. - Vol. 85, № 6. - P987-992. - Bibliogr. : p. 991-992 (24 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Hybrid organo-inorganic materials based on the chitosan-SiO2, chitosan-Al2O3, and chitosancellulose systems are prepared. The structure of the surface is studied by means of EPR spectroscopy using the stable pH-sensitive nitroxyl radical, 4-dimethylamino-2-ethyl-5,5-dimethyl-2-pyridine-4-yl-2,5-dihydro-1H-imidazole-1-oxyl as adsorbed probe molecules, and the processes that occur during the formation of hybrid materials are considered

\\\\Expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2011, V.85, N 6, p.987.pdf
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5.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis of carbon encapsulated metal (Ni and Cu) nano particles and applications for chiral catalysts [Text] / Young Rang Uhm , Hi Min Lee , O. V. Fedorova, I. G. Ovchinnikova, M. S. Valova, G. L. Rusinov, V. N. Charushin, Chang Kyu Rhee // Research on Chemical Intermediates . - 2010. - Vol. 36, № 6-7. - P867-873. - Bibliogr. : p. 873 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Carbon-encapsulated Ni and Cu nanoparticles with a core/shell structure were synthesized by levitational gas condensation (LGC). Methane (CH4) gas was used to coat the surface of the Ni and Cu nanoparticles. The Ni particles had a core diameter of 10 nm, and were covered by 2–3 nm thin carbon layers. In the case of Cu, the particles had a core diameter of 30 nm, and multi-shells with a thickness of 2–3 nm. Biginelli reaction in the presence of l-proline and Ni encapsulated nanoparticles was carried out to change the ratio between stereoisomers in favor of the S-enantiomer for 3,4–dihydropyrimidine (DHPM) with an excess of about 18%

\\\\Cserver\\dist\\НБО\\Электронная библиотека_Библиогр1\\Research on Chemical Intermediates\\2010, v. 36, N. 6-7, p.867.pdf
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6.
Инвентарный номер: нет.
   
   C 31


   
    Catalytic effect of nanosized metal oxides in the Biginelli reaction [Text] / O. V. Fedorova, M. S. Valova, Yu. A. Titova, I. G. Ovchinnikova, A. N. Grishakov, M. A. Uimin, A. E. Ermakov, G. L. Rusinov, V. N. Charushin // Kinetics and Catalysis. - 2011. - Vol. 52, № 2. - P226-233. - Bibliogr. : p. 233 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The effect of nanosized metal oxides on the regio- and stereoselectivity of the multicomponent Biginelli reaction and the reaction mechanism under conditions of heterogeneous catalysis were studied. It was found that the considerable activation of reagents occurred on the surface of metal nanooxides. The Biginelli reaction occurred by two mechanisms: a carbocationic mechanism took place along with the generally accepted mechanism (through the N-acyliminium ion). Nanosized metal oxides in the presence of chiral inductors increased the regio- and stereoselectivity of the Biginelli reaction

\\\\Expert2\\nbo\\Kinetics and Catalysis\\2011, v. 52, N 2, p. 226.pdf
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7.
Инвентарный номер: нет.
   
   S 89


   
    Structure and characteristics of chitosan cobalt-containing hybrid systems, the catalysts of olefine oxidation [Electronic resource] / A. V. Mekhaev, A. V. Pestov, L. S. Molochnikov, E. G. Kovaleva, M. G. Pervova, Yu. G. Yatluk, I. A. Grigor'ev, I. A. Kirilyuk // Russian Journal of Physical Chemistry A, Focus on Chemistry. - 2011. - Vol. 85, № 7. - P1155-1161. - Bibliogr. : p. 1160-1161 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Cobalt-containing hybrid organo-inorganic materials based on the chitosan-SiO2, chitosan-Al2O3, and chitosan-cellulose systems were obtained. The surface structure and processes that occur during the formation of metal-containing materials, the catalytic properties of which were studied in the oxidation reactions of alkene, were investigated by EPR spectroscopy using a stable pH-sensitive nitroxyl radical, 4-dimethylamino-2-ethyl-5,5-dimethyl-2-(pyridin-4-yl)-2,5-dihydro-1H-imidazole-1-oxyl, as the adsorbed probe molecules

\\\\Expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2011, V.85, N 7, p.1155.pdf
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8.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis and surface structural characteristics of new polysiloxane xerogel [Electronic resource] / A. S. Zasuhin, L. K. Neudachina, Yu. G. Yatluk, L. V. Adamova, O. A. Osipova, E. M. Gorbunova, Yu. S. Moskaleva, T. Yu. Lapina // Russian Journal of Physical Chemistry A, Focus on Chemistry. - 2011. - Vol. 85, № 3. - P478-482 : ил. - Bibliogr. : p. 482 (24 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Pyridylethylaminopropylpolysiloxane xerogel (PEAPPSX) was synthesized by sol-gel technology. The composition of the substance was determined via elemental analysis and 1H NMR spectroscopy. The surface structural characteristics of the xerogel were determined by electron microscopy and low-temperature nitrogen sorption; thermal analysis was also performed. It was established that the content of functional groups in PEAPPSX was 2.43 mmol/g, and that xerogel is a mesoporous substance with a developed surface (121.71 m(2)/g)

\\\\Expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2011, V.85, N 3, p.478.pdf
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9.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis, characterization and application of a new modified polysiloxane with grafted 2-aminoethylpyridine functional groups [Text] / A. S. Zasuhin, L. K. Neudachina, Yu. S. Moskaleva, O. A. Osipova, Yu. G. Yatluk // Modern problems of Surface Chemistry and Physics : International Symposium devoted to the 80th anneversary of Academician O. O. Chuiko, Kyiv, 18-21 May 2010 : abstracts. - Kyiv, 2010. - P350-351 : il.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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10.
Инвентарный номер: нет.
   
   S 70


   
    Sol-Gel Synthesis and Physicochemical Properties of Organosilicon Materials Functionalized by Amino Groups / L. K. Neudachina, N. V. Lakiza, A. V. Pestov, V. A. Osipova, L. V. Adamova, E. M. Gorbunova // Glass Physics and Chemistry. - 2011. - Vol.37, № 5. - С. 537-544
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
"SOL-GEL" MATERIALS -- AMINOPOLYSILOXANES -- SPECIFIC SURFACE AREA
Аннотация: The hybrid materials based on polysiloxane modified by amino groups have been synthesized by the sol-gel method. Aminated polysiloxane has been prepared by the copolycondensation reaction of tetraethoxysilane with gamma-aminopropyltriethoxysilane (APS-1) and through the modification of the product (APS-2) of the hydrolysis of tetraethoxysilane by gamma-aminopropyltriethoxysilane. The composition of sorbents has been confirmed by the elemental analysis and IR Fourier spectroscopy. The high degree of sorption extraction of copper(II), nickel(II), cobalt(II), zinc(II), cadmium(II), and lead(II) ions in the case of their coexistence in an ammonia-acetate buffer solution has been observed for polysiloxanes APS-2. The synthesized surface-modified materials exhibit the highest selectivity to nickel(II) and cobalt(II) ions

\\\\Expert2\\nbo\\Glass Physics and Chemistry\\2011, V. 37, N 5, P.537-544.pdf
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