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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.
   
   C 21


   
    Carbon deposition from aromatic solvents onto active intact 3d metal surface at ambient conditions / A. P. Safronov, G. V. Kurlyandskaya, A. A. Chlenova, M. V. Kuznetsov, D. N. Bazhin, I. V. Beketov, M. B. Sanchez-Ilarduya , A. Martinez-Amesti // Langmuir. - 2014. - Vol. 30, № 11. - С. 3243-3253
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CARBON DEPOSITION -- AROMATIC SOLVENTS -- AMBIENT CONDITIONS

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2.
Инвентарный номер: нет.
   
   C 31


   
    Catalysts for enantioselective Biginelli reaction based on the composite silica-zirconia xerogels prepared using different zirconium sources [Electronic resource] / I. V. Krivtsov, Yu. A. Titova, M. V. Ilkaeva, V. V. Avdin, O. V. Fedorova, S. A. Khainakov, J. R. Garcia, G. L. Rusinov, V. N. Charushin // Journal of Sol-Gel Science and Technology . - 2014. - Vol.69, №2. - С. 448-452. - Bibliogr. : p. 452 (17 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
SOL-GEL METHOD -- ZIRCONIUM OXYCHLORIDE -- SILICA-ZIRCONIA XEROGELS
Аннотация: The composite silica-zirconia xerogels have been prepared via sol-gel method using zirconium oxychloride, oxynitrate, acetate and sodium silicate as the precursors. The prepared materials have been characterized using FTIR, TG/DTA, EDX and surface area analyses. It has been established that surface area of silica-zirconia xerogels significantly depends on the zirconium source, but phase transitions and structural features of the xerogels seem to be unaffected by the choice of the zirconia precursor. Prepared xerogels increase the activity of chiral inductor in the asymmetric Biginelli reaction. The anion of the zirconium salt adsorbed on the surface of the synthesized material and the presence of Si-O-Zr heterolinkages determines the reaction yield. The highest chemo- and enantioselectivity towards formation of ee isomer have been provided by the catalyst prepared from zirconium oxychloride.

\\\\expert2\\nbo\\Journal of Sol-Gel Science and Technology\\2014, v.69, N 2, p.448-452.pdf
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3.
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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4.
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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5.
Инвентарный номер: нет.
   


   
    Combination of fluorescent and spin labels: a powerful method for the optimization of hydrophilic membranes for the separation of oil-in-water emulsions / R. S. Alqubelat, A. D. Kuznetsova, D. O. Antonov, M. A. Mironov // Chimica Techno Acta. - 2023. - Vol. 10, № 4. - P202310415
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
FLUORESCENT LABEL -- SPIN LABEL -- OIL-IN-WATER EMULSION
Аннотация: A new method for assessing the quality of fibre coating based on a combination of fluorescence microscopy and electron paramagnetic resonance is presented in this work. An influence of the carboxymethylcellulose/polyvinylamine gel preparation method on the mobility of the spin label was established. The mobility of the spin label changes from 3.5 ns in the case of a polyvinylamine solution to 12.8 ns in the case of a cross-linked gel on the surface of the glass fibre. A qualitative relationship was found between the mobility of the spin label in the gel applied to the glass fibre and the rate of spreading of crude oil over its surface. This method can be used to make membranes for the separation of water-in-oil emulsions.

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6.
Инвентарный номер: нет.
   
   D 38


    Demin, A. M.
    Covalent surface modification of Fe3O4 magnetic nanoparticles with alkoxy silanes and amino acids [Электронный ресурс] / A. M. Demin, V. P. Krasnov, V. N. Charushin // Mendeleev Communications. - 2013. - Vol.23, №1. - P14-16
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
Fe3O4 -- MAGNETIC NANOPARTICLES -- ALKOXY SILANES
Аннотация: (3-Aminopropyl)silane-modified magnetic nanoparticles containing ε-aminocaproic acid and l-lysine fragments with free functional groups were obtained by the surface modification of Fe3O4 with alkoxysilane derivatives

\\\\Expert2\\NBO\\Mendeleev Communications\\2013, v.23, p. 14.pdf
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7.
Инвентарный номер: нет.
   


   
    Design of SiO2/aminopropylsilane-modifi ed magnetic Fe3O4 nanoparticles for doxorubicin immobilization / A. M. Demin, A. V. Vakhrushev, M. S. Valova [et al.] // Russian chemical bulletin. - 2021. - Vol. 70, № 5. - P987-994
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
MAGNETIC NANOPARTICLES -- N-PHOSPHONOMETHYLIMINODIACETIC ACID -- DOXORUBICIN -- SiO2 COATING -- SORPTION
Аннотация: Surface modifi cation of magnetic nanoparticles (MNPs) with tetramethylorthosilicate and 3-aminopropyltrimethoxysilane was studied. The use of N-phosphonomethyliminodiacetic acid for the stabilization of the initial MNPs can signifi cantly increase the coating thickness and specifi c surface area of SiO2/APS-modifi ed (APS is 3-aminopropylsilane) MNPs. The possibility of sorption of antitumor drug doxorubicin (DOX) on the synthesized nanoparticles was studied. The degree of sorption of DOX increases with an increase in the specifi c surface area of the particles.

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8.
Инвентарный номер: нет.
   
   D 49


   
    Development of methods for preparation of Nd : YAG nanoparticles / I. S. Puzyrev, I. V. V'yukhina, M. Ivanov, Yu. G. Yatluk // Glass Physics and Chemistry. - 2012. - Vol.38, №4. - С. 427-430
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
SYNTHESIS -- NANOSIZED PRECURSORS -- YTTRIUM-ALUMINUM
Аннотация: Methods for synthesis of nanosized precursors for the preparation of yttrium-aluminum garnet from organic-inorganic derivatives of yttrium and aluminum have been developed. It has been shown that most of the methods for carrying out the process result in the formation of precursors with high specific surface area. The precursor obtained using nanosized powder of aluminum oxide and yttrium acetylacetonate is the least agglomerated. The data obtained can be used when preparing optical ceramic from yttrium-aluminum garnet

\\\\Expert2\\nbo\\Glass Physics and Chemistry\\2012, V. 38, N 4, P.427-430.pdf
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9.
Инвентарный номер: нет.
   
   E 27


   
    Effect of nanosized TiO2–SiO2 covalently modified by chiral molecules on the asymmetric Biginelli reaction [Electronic resource] / Yu. A. Titova, O. V. Fedorova, G. L. Rusinov, A. Yu. Vigorov, V. P. Krasnov, A. Murashkevich, V. N. Charushin // Catalysis Today. - 2015. - Vol. 241. - С. 270-274. - Bibliogr. : p. 274 (23 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
NANOOXIDE TiO2–SiO -- BIGINELLI REACTION -- ASYMMETRIC CATALYSIS
Аннотация: The method for immobilization of chiral molecules (menthol and proline derivatives) on the mixed nanooxide TiO2–SiO2 surface has been developed. The synthesized nanocomposites were used as catalysts of the Biginelli reaction. It was shown that inactive chiral molecules, when covalently bonded to the nanooxide surface, acquired properties of a chiral inducer in the asymmetric Biginelli reaction.

\\\\expert2\\nbo\\Catalysis Today\\2015, v.241, p.270.pdf
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10.
Инвентарный номер: нет.
   
   E 27


   
    Effect of polarity of solvent on silanization of halloysite nanoclay using (3-glycidyloxy propyl) trimethoxy silane / A. M. Abu el-Soad, A. V. Pestov, N. A. Martemyanov [et al.] // Journal of inorganic and organometallic polymers and materials. - 2021. - № 31. - P2569–2578
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The grafting of silane groups on clay surfaces has been recently investigated in order to fabricate versatile compounds with new potential applications in materials science and ecological engineering. This work explored the influence of variety of solvents with variable polarity on the silanization of halloysite nanoclay (HNT) surface by (3-Glycidyloxy propyl) trimethoxy silane. To this purpose, the functionalization of HNT by 3-Glycidyloxypropyltrimethoxysilane (GOPTMS) has been conducted in Ethanol (polar protic solvent), Tetrahydrofuran (THF) and Acetonitrile (polar aprotic solvents), and Hexane, 1,4-Dioxane and Toluene (non polar solvents). The silane grafted materials were characterized by using several techniques, including Fourier Transform Infrared Spectroscopy (FT-IR), elemental analysis, Scanning Electron Microscopy (SEM), Thermogravimetry (TGA), X-ray Diffraction Analysis (XRD) and Nitrogen adsorption/desorption isotherms. The largest silane loading has been detected for the hybrid nanomaterials prepared in Hexane as a dispersing medium.

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