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 Найдено в других БД:Труды Института высокотемпературной электрохимии УрО РАН (1)Труды сотрудников Института химии твердого тела УрО РАН (4)Публикации Чарушина В.Н. (4)
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Общее количество найденных документов : 101
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1.
Инвентарный номер: нет.
   
   B 62


   
    Bis[N-(2-hydroxyethyl)-beta-alaninato]-copper(II) [Text] / A. V. Pestov, E. V. Peresypkina, A. V. Virovets, N. V. Podberezskaya, Yu. G. Yatluk, Yu. A. Skorik // Acta Crystallographica Section C: Crystal Structure Communications. - 2005. - Vol. 61, № 12. - Pm510-m512
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The CuII ion in the title complex, [Cu(C5H 10NO3)2] or [Cu(He-ala)2] [He-ala = W-(2-hydroxyethyl)-?-alaninate], resides at the inversion centre of a square bipyramid comprised of two facially arranged tridentate He-ala ligands. Each He-ala ligand binds to a CuII ion by forming one six-membered ?-alaninate chelate ring in a twist conformation and one five-membered ethanolamine ring in an envelope conformation, with Cu-N = 2.017 (2) A, Cu-OCoo = 1.968 (1) A and Cu-OOH = 2.473 (2) A. The [Cu(He-ala)2] molecules are involved in a network of O-H?O and N-H?O hydrogen bonds, forming layers parallel to the (101?) plane. The layers are connected into a three-dimensional structure by van der Waals interactions, so that the molecular centres form pseudo-face-centered close packing. © 2005 International Union of Crystallography????

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2.
Инвентарный номер: нет.
   
   N 10


   
    N-alkylation of chitosan by beta-halopropionic acids in the presence of various acceptors [Text] / A. V. Pestov, Yu. A. Skorik, G. Kogan, Yu. G. Yatluk // Journal of Applied Polymer Science . - 2008. - Vol. 108, № 1. - P119-127
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: N-carboxyethylation of chitosan by -halopropionic acids in the presence of various proton and halogen ion acceptors was investigated. It has been observed that carboxyethylation of chitosan in aqueous medium is accompanied by the by-processes of hydrolysis and dehydrohalogenation of the -halopropionic acids yielding -hydroxypropionic acid, bis(2-carbox-yethyl) ether, and acrylic acid. Degree of carboxyethyl substitution (DS) of chitosan and the relative rates of the by-processes varied significantly depending on the conditions used and nature of the proton or halogen ion acceptor. At carboxyethylation of chitosan with the alkaline -bromopropionates, the DS increased in the order Cs+ Rb- K+ sim; Na+ Li-.

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3.
Инвентарный номер: нет.
   
   I-60


   
    Influence of metal coordination on conductivity behavior in poly(butadiene-acrylonitrile)-CoCl2 system [Text] / O. V. Bushkova, I. P. Koryakova, Yu. A. Skorik, B.I. Lirova, A. V. Pestov, V. M. Zhukovskii // Electrochimica Acta. - 2008. - Vol. 53, № 16. - P5322-5333
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The metal complex formation and the electrical properties of amorphous solid polymer electrolytes, based on poly(butadiene-acrylonitrile) copolymer (PBAN) and CoCl2, have been studied over the homogeneity region of the system limited by the CoCl2 concentration of 1.89 mol kg-1. It has been found that ionic conductivity is carried out by the unipolar anion transfer at lower CoCl2 concentrations (up to 0.10 mol kg-1). As the CoCl2 concentration increases, electronic conductivity appears in addition to ionic conductivity, and the former becomes dominant, starting from 0.38 mol kg-1. It has been shown that the nature of charge carriers is determined by the composition of metal complexes formed by CoCl2 and the macromolecular solvent PBAN. At lower concentrations, the [Co2L2Cl4]0 dimers are the predominant species (L being macromolecule side groups C{triple bond, long}N), and their dissociation is followed by the formation of mobile Cl- anions and immobile binuclear [Co2Cl3]+ complexes. As CoCl2 concentration increases, polynuclear [ConL2Cl2n]0 (n 2) complexes appear (L being C{triple bond, long}N and C{double bond, long}C groups of PBAN). Specific features of chemical bonds in ?-complexes of transition metals result in the appearance of electronic charge carriers. The abrupt increase in conductivity observed at the highest CoCl2 concentration is connected with the formation of a percolation network of polynuclear [ConL2Cl2n]0 complexes

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4.
Инвентарный номер: нет.
   
   M 57


   
    Mercury sorption on a thiocarbamoyl derivative of chitosan [Text] / K. C. Gavilan, A. V. Pestov, H. M. Garcia, Yu. G. Yatluk, J. Roussy, E. Guibal // Journal of Hazardous Materials. - 2009. - Vol. 165, № 1-5. - P415-426
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The grafting of thiourea on chitosan backbone allows synthesizing a thiocarbamoyl derivative that was very efficient for mercury sorption in acidic solutions. Though the sorption capacity is not increased compared to raw chitosan in near neutral solutions, this modification allowed maintaining high sorption capacity (close to 2.3 mmol Hg g-1) at pH 2. Mercury sorption in acidic solutions is not affected by the presence of competitor metals (such as Zn(II), Pb(II), Cu(II), Cd(II), Ni(II)) or the presence of nitrate anions (even at concentration as high as 0.8 M)). The presence of chloride or sulfate anions (0.8 M) decreased Hg(II) sorption capacity to 1 mmol Hg g-1. Kinetics are controlled by a combination of pseudo second-order reaction rate and resistance to intraparticle diffusion. Mercury desorption reached about 75% using thiourea (in HCl solution)

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5.
Инвентарный номер: нет.
   
   H 43


   
    Heavy metals removal by flocculation/precipitation using N-(2-carboxyethyl)chitosans [Text] / S. YU. Bratskaya, A. V. Pestov, Yu. G. Yatluk, V. A. Avramenko // Colloids and Surfaces A: Physicochemical and Engineering Aspects. - 2009. - Vol. 339, № 1-3. - P140-144
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Here we report on solution properties and flocculation performance of polyampholyte chitosan derivatives - N-carboxyethylated chitosans (CEC) - synthesized "in gel" by treatment of chitosan with acrylic acid. We show that carboxyethylation with the substitution degrees (DS) from 0.7 to 1.6 yields water-soluble derivatives, whose isoelectric points (IEP) range from 6.30 to 3.55. At pH 7.5 interaction of negatively charged CEC derivatives with positively charged colloids of the heavy metal hydroxides (Zn2+, Cu2+, Ni2+), serving as a model of postgalvanic wastewaters, results in lowering of electrokinetic potential of the hydroxide colloids and their precipitation at appropriate flocculant dose. Investigations of CEC flocculation performance depending on pH and DS show that the efficiency of metal removal decreases in the row Cu2+ Zn2+ Ni2+ corresponding to the row of the hydroxocomplex stability for these metals. The higher was pH of the system and DS of CEC derivative, the narrower was the flocculation window and the stronger was negative effect of flocculant overdosing on the efficiency of heavy metal removal. Based on the estimation of floc settling rates and the residual metal concentrations, we have concluded that the optimal DS of CEC derivatives for the precipitation of metal hydroxides is 0.7-1.0

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6.
Инвентарный номер: нет.
   
   A 10


   
    A generalized model of protolytic, complexing and colloidal properties of polyelectrolytes. Case study : N-(2-carboxyethyl)chitosans [] : доклад, тезисы доклада / S. YU. Bratskaya, A. Golikov, A. V. Pestov, A. Voit, Yu. G. Yatluk, V. A. Avramenko // EUCHIS 2009 - 9th International Conference of the European Chitin Society , Venice, Italy, 23-26 May 2009 : conference book. - Venice, Italy, 2009. - 21 (P1-5)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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7.
Инвентарный номер: нет.
   
   S 45


   
    Selective sorption of gold (III), platinum (IV) and palladium (II) [] : доклад, тезисы доклада / S. Yu. Bratskaya, A. V. Pestov, A. Slobodyuk, V. A. Avramenko, Yu. G. Yatluk // EUCHIS 2009 - 9th International Conference of the European Chitin Society , Venice, Italy, 23-26 May 2009 : conference book. - Venice, Italy, 2009. - 146 (P03-13)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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8.
Инвентарный номер: нет.
   
   N 10


   
    N-2-(2-pyridyl)ethylchitosan new chelate polymer [] : доклад, тезисы доклада / A. V. Pestov, S. Yu. Bratskaya, V. A. Avramenko, Yu. G. Yatluk // EUCHIS 2009 - 9th International Conference of the European Chitin Society , Venice, Italy, 23-26 May 2009 : conference book. - Venice, Italy, 2009. - 158 (P03-30). - Библиогр.: с. 158 (3 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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9.
Инвентарный номер: нет.
   
   S 70


   
    Solution properties of 2-carboxyethylchitosans [] : доклад, тезисы доклада / A. V. Pestov, S. Yu. Bratskaya, V. A. Avramenko, Yu. G. Yatluk // Asian Symposium Advanced Materials, Vladivostok, Russia, 1-4 October 2007 : Final Programme and Abstracts. - Vladivostok, 2007. - P. 1-17. - Библиогр.: с. P. 1-17 (4 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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10.
Инвентарный номер: нет.
   
   P 49


    Pestov, A. V.
    In-gel carboxyethylation of chitosan by beta-halopropionic acids [] : доклад, тезисы доклада / A. V. Pestov, Yu. A. Skorik, Yu. G. Yatluk // 10-th International Conference on Chitin and Chitosan - 7th International Conference of the European Chitin Society, Le Corum, Montpellier, France, 6-9 September 2006 : book of abstracts . - Le Corum, Montpellier (France), 2006. - 76 (PC 11)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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