Visnik Dnipropetrovs''kogo Universitetu Seria Himia最新文献_第2页

Discussion aspects of the theory of galvanostatic phase formation 恒流相形成理论的讨论方面

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-12-02 DOI: 10.15421/081414

Iurii Kryshtop, V. Trofimenko

{"title":"Discussion aspects of the theory of galvanostatic phase formation","authors":"Iurii Kryshtop, V. Trofimenko","doi":"10.15421/081414","DOIUrl":"https://doi.org/10.15421/081414","url":null,"abstract":"The thermodynamic and kinetic peculiarities of metal nucleation under galvanostatic conditions are considered. The alternative expressions for supersaturation in electrochemical systems in terms of overall overpotential (Kaischew, Budevski, Malev, Polukarov, de Levi at al.) or crystallization overpotential (Fischer, Volmer, Schottky, Vetter, Lorenz, Gerischer at al.) are discussed. It is shown that incorrect use of expression for supersaturation in terms of overall overpotential leads some authors to unreasonable interpretation of experimental data. This leads to negative impact on electrochemical nucleation theory development. Some kinetic theories (Schottky, Baraboshkin, Kashchiev) take into account changes of supersaturation and atoms consumption by growing nuclei during the current pulse. However this corrections are difficult to identify. Computer modeling of galvanostatic phase formation (Isaev, Baraboshkin, Volegov) correctly describes the time dependence of the main parameters of nucleation. Moreover, applying of this approach in data processing of experimental overpotential transients requires the kinetic and thermodynamic constants of the process determination. Gutsov`s kinetic model is still more suitable for the analysis of experimental overpotential transients, because this theory takes into account the influence of crystallization overpotential on the rate of phase formation.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"22 1","pages":"16-22"},"PeriodicalIF":0.0,"publicationDate":"2014-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67580329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SIMULTANEOUS DETERMINATION OF TWO ACTIVE COMPONENTS OF PHARMACEUTICAL PREPARATIONS BY SEQUENTIAL INJECTION METHOD USING HETEROPOLY COMPLEXES 用杂多络合物序贯注射法同时测定药物制剂中两种有效成分

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-12-02 DOI: 10.15421/081408

M. Al-Shwaiyat, T. Denisenko, Sergey V. Zaruba, A. Vishnikin, L. P. Tsiganok, V. Andruch, Y. Bazel

引用次数: 3

INFLUENCE OF THE NATURE OF SURFACE-ACTIVE SUBSTANCES ON RHEOLOGY OF HIGH-FILLED PASTELIKE COMPOSITIONS ON A BASE ON LIQUID DIENE RUBBER AND DISPERSE FILLER 表面活性物质性质对液体二烯橡胶和分散填料高填充膏状组合物流变性能的影响

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-12-02 DOI: 10.15421/081415

Alexander B. Surovtcev, K. Kovalenko, N. Kuzmenko, Sergey G. Bondarenko

{"title":"INFLUENCE OF THE NATURE OF SURFACE-ACTIVE SUBSTANCES ON RHEOLOGY OF HIGH-FILLED PASTELIKE COMPOSITIONS ON A BASE ON LIQUID DIENE RUBBER AND DISPERSE FILLER","authors":"Alexander B. Surovtcev, K. Kovalenko, N. Kuzmenko, Sergey G. Bondarenko","doi":"10.15421/081415","DOIUrl":"https://doi.org/10.15421/081415","url":null,"abstract":"Приведены результаты исследований по получению пастообразных высоконаполненных композиций и оценке их реологических свойств с использованием ротационного вискозиметра «Реотест-2» на системе конус плоскость. В состав композиций вводили олигомерный каучук СКД-ГТР в качестве связующего, поверхностно-активное вещество (ПАВ) и дисперсный наполнитель. Выполнена оценка седиментационной стойкости композиций и их текучести в интервале напряжений сдвига 1–30 кПа и температур от 30 до 50°С. По результатам оценки влияния концентрационной зависимости ПАВ на показатель вязкости показано, что целесообразно его введение в пастообразную композицию на уровне 0.5 мас. %. Для рассмотренного в работе малополярного олигомерного диенового каучука более эффективное снижение вязкости пастообразной композиции обеспечивают полипропиленгликоли, особенно в среднем интервале напряжений сдвига, который в основном может быть использован на практике. Незначительно уступают им титанорганические производные олигомерных полиоксипропиленгликолей. Наибольший эффект снижения вязкости для композиций достигнут при использовании олигомерного ППГ с молекулярной массой 480, в данном случае вязкость композиции находится на уровне 10 Па ⋅ с для весьма широкого интервала напряжений сдвига.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"22 1","pages":"76-81"},"PeriodicalIF":0.0,"publicationDate":"2014-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67580459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Іонообмінні плівкові матеріали на основі олігоепіхлоргідринового епоксиду і піперазину 基于低聚环氧氯丙烷和哌嗪的离子交换流体材料

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-12-02 DOI: 10.15421/081413

K. E. Varlan, Svetlana A. Plotichkina, Aleksandra L. Kuzmenko

引用次数: 0

Statistical characteristics of spectrophotometric method for polyhexamethyleneguanidinedetermining 分光光度法测定聚六亚甲基胍的统计特性

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-12-02 DOI: 10.15421/081402

Tatiana S. Chmilenko, Lidiya A. Ivanitsa, F. Chmilenko

{"title":"Statistical characteristics of spectrophotometric method for polyhexamethyleneguanidinedetermining","authors":"Tatiana S. Chmilenko, Lidiya A. Ivanitsa, F. Chmilenko","doi":"10.15421/081402","DOIUrl":"https://doi.org/10.15421/081402","url":null,"abstract":"Предложена аналитическая система для определения полигексаметиленгуанидиний хлорида (ПГМГ) с Мо(VI) и дисульфофенилфлуороном в среде NaNO 3 . Соотношение компонентов в тройных комплексах НФФ:ПГМГ:Мо(VI) определены по тройной диаграмме Гиббса-Розенбома и составили 3:1:1 (520 нм ) и 6:3:1 (570 нм ). В тройной системе также образуются ассоциат ПМГМ:НФФ с соотношением 1:2 и макрометаллохелат ПГМГ⋅2Mo(VI). Методика позволяет определять ПГМГ по градуировочной характеристике второго порядка в концентрационном интервале 0.1–2.0 мг/л , предел обнаружения составляет 0.03 мг/л . Определению не мешают такие металлы как Cu(II), V(IV), W(VI), Al(III), Co(II). Статистическая обработка была проведена в соответствии с ДСТУ ISO 8466-1-2001 и ДСТУ ISO 8466-2-2001.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"22 1","pages":"30-35"},"PeriodicalIF":0.0,"publicationDate":"2014-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67580096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Мікроекстракційне розділення, концентрування і спектрофотометричне визначення додецилсульфату натрію у вигляді іонного асоціату з хінальдиновим червоним 奎纳定红配钠离子的微萃取分离、浓度及分光光度法测定

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-12-02 DOI: 10.15421/081404

Vasylyna M. Lavra

{"title":"Мікроекстракційне розділення, концентрування і спектрофотометричне визначення додецилсульфату натрію у вигляді іонного асоціату з хінальдиновим червоним","authors":"Vasylyna M. Lavra","doi":"10.15421/081404","DOIUrl":"https://doi.org/10.15421/081404","url":null,"abstract":"The optimal conditions for the microextraction separation, preconcentration and spectrophotometric determination of sodium dodecyl sulfate (SDS) as an its ion associate (IA) with Quinaldine Red (QR) have been studied. Was tested a large number of organic solvents as extractants. Aliphatic hydrocarbons (hexane) extracted IA considerably weaker than, halogen and nitro derivatives of hydrocarbons (chlorobenzene, bromobenzene, nitrobenzene, chloroform, dichloroethane), extracted with IA and the simple salt of the dye. The best solvent found for the extraction of SDS was mixture of carbon tetrachloride with dichloroethane or chloroform that provided 10 to 50 fold concentration of SDS by microvolume of organic phase. The maximum extraction of SDS was achieved in the concentration range of QR 1.0∙10 –4 mol/l of QR after which the optical density does not change practically (excess dye remains in the aqueous phase). The dye of QR is highly stable in an alkaline environment, it can be used for the extraction of SDS in a wide pH range and rely on high selectivity determination. The pH range for maximum extraction of ion associate was 4–12. We found that 50000–100000-fold amounts F – , Cl – , Br – , NO 2 – , HCO 3 – , CH 3 COO – , SO 4 2– , 10000–20000-fold amounts NO 3 – , I – , HPO 4 2– , B 4 O 7 2– , IO 3 – , ClO 3 – , C 2 O 4 2– , 300-fold amounts ClO 4 – do not interfere with the determination of SDS. The molar ratio of SDS and QR determined by various spectrophotometric methods (isomolar series, Asmus, equilibrium shift) is 1:1. The limit of detection was 0.04 µg/ml. A new method of extraction-spectrophotometric determination was applied to the determination of anionic surfactants in various wastewater samples.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"22 1","pages":"45-51"},"PeriodicalIF":0.0,"publicationDate":"2014-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67579884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interaction of 2,3-dihydro-1H-benzodiazepinone-2 with epichlorhydrine 2,3-二氢- 1h -苯二氮卓酮-2与环氧氯丙烷的相互作用

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-12-02 DOI: 10.15421/081401

O. O. Gaponov, I. Tarabara

引用次数: 0

Academician L. V. Pisarzhevsky is the founder of chemical science and education in Dnipropetrovsk university L. V. Pisarzhevsky院士是第聂伯罗彼得罗夫斯克大学化学科学和教育的创始人

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-12-02 DOI: 10.15421/081403

V. Kovalenko, Viktor F. Vargaliuk, Nadiia V. Stets

{"title":"Academician L. V. Pisarzhevsky is the founder of chemical science and education in Dnipropetrovsk university","authors":"V. Kovalenko, Viktor F. Vargaliuk, Nadiia V. Stets","doi":"10.15421/081403","DOIUrl":"https://doi.org/10.15421/081403","url":null,"abstract":"The article is devoted to the 140 anniversary of birth of the academician Lev Vladimirovich Pisarzhevsky, who was a distinguished chemical scientist, founder of the important area of chemical science – electronic chemistry. The article dwells upon the basic stages of the scientist’s life and creative art. The major results of scientific and educational activity during Dnipropetrovsk period of his life are reported. His role in the foundation of dnipropetrovsk scientific school of physical chemistry, as well as in its establishment, is shown. The pioneering role of the academician L. V. Pisarzhevsky in the formation of the theory of redox reactions as processes of returning and joining of electrons, which is generally accepted nowadays, as well as in the creation of backgrounds of modern electronic theories of catalysis, has been shown. L. V. Pisarzhevsky is characterized as a wonderful lecturer and teacher who expounded chemical material from the point of view of electronic conception and laid the foundation for the reformation of chemistry. The role of the academician L. V. Pisarzhevsky in the foundation of Dnipropetrovsk University and its chemical department, as well as in the organization of educational process in this establishment, is exposed using archive materials, which are kept in the funds of the State Archive of the Dnipropetrovsk region and of the historical museum of Oles Honchar Dnipropetrovsk National University.","PeriodicalId":31165,"journal":{"name":"Visnik Dnipropetrovs''kogo Universitetu Seria Himia","volume":"22 1","pages":"82-88"},"PeriodicalIF":0.0,"publicationDate":"2014-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67579789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

THEORETICAL STUDY OF IONIZATION POTENTIALS OF N-HETEROCYCLIC COMPOUNDS n -杂环化合物电离势的理论研究

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-12-02 DOI: 10.15421/081410

L. Sviatenko

引用次数: 0

1H NMR spectra of N-methyl-4-tolyl-1-(4-bromonaphthyl)amine and N-phenyl-1-(4-bromonaphthyl)amine: a combined experimental and theoretical study n -甲基-4-甲基-1-(4-溴萘基)胺和n -苯基-1-(4-溴萘基)胺的1H NMR谱:实验与理论相结合的研究

Visnik Dnipropetrovs''kogo Universitetu Seria Himia Pub Date : 2014-03-28 DOI: 10.15421/081313

S. Okovytyy, Svitlana D. Kopteva, E. Voronkov, T. Sergeieva, K. Kapusta, L. Dmitrikova, J. Leszczynski

引用次数: 4