G. Liptay

Bio: G. Liptay is an academic researcher from University of Vienna. The author has contributed to research in topics: Thermal decomposition & Weight change. The author has an hindex of 11, co-authored 14 publications receiving 474 citations. Previous affiliations of G. Liptay include Eötvös Loránd University.

Spectroscopic and thermoanalytical characterization of standard substances for the identification of reaction products on iron electrodes

Abstract: The in situ spectroscopic investigation of electrochemical, and especially corrosion processes in iron requires well-characterized reference substances. It has been found that the application of spectroscopic methods alone is not sufficient for the detection of impurities in certain phases. Thermoanalytical methods have therefore additionally been used to detect impurities and to optimize the preparation methods. Infrared and Raman spectra and thermoanalytical data onα-FeOOH,β-FeOOH,γ-FeOOH,δ-FeOOH and on amorphous iron(III) hydroxide sol are reported.

Kinetic analysis of thermogravimetric data. X: Thermal decomposition of some tris-ethylenediamine-cobalt(III) and chromium(III) complexes

Abstract: A study was made of the thermal decompositions of 22 derivatives of[M(en)3]X3 type complexes. Partial de-amination leading to the formation of[M(en)2X2]X type complexes occurs in the case ofM=Cr(III) ifX=Cl, Br, I orNCS, but in the case ofM=Co(III) it is possible only ifX=Cl. In other cases redox reactions hinder the formation of stable intermediates. Kinetic parameters were derived for the dehydration of 19 compounds.The validity of a linear kinetic compensation law was observed. The dependence of the kinetic compensation parameters on the nature of the thermal process is discussed.RésuméOn a étudié la décomposition thermique de 22 dérivés des complexes du type[M(en)3]x3. La réaction de désamination partielle qui amène la formation des complexes du type[M(en)2X2]X se produit dans le cas deCr(III), siX=Cl, Br, I ouCNS, mais dans le cas deCo(III) elle n'est possible que siX=Cl. Dans les autres cas, la formation d'intermédiaires stables est empêchée par des réactions d'oxydo-réduction. On a calculé les paramètres cinétiques pour la déshydratation de 19 composés.On a constaté la validité d'une loi de compensation cinétique linéaire. On discute la manière dont les paramètres de compensation cinétique dépendent de la nature du processus thermique.ZusammenfassungDie thermische Zersetzung von 22 Derivaten des Komplextyps[M(en)3]X3 wurde untersucht. Die partielle Deaminierungsreaktion, welche zur Bildung von Komplexen des Typs[M(en)2X2]X führt, tritt beiCr(III)-Komplexen in dem FalleX=Cl, Br, I oderNCS auf, ist aber beiCo(III)-Komplexen nur beiX=Cl möglich. In anderen Fällen wird die Bildung von stabilen Zwischenprodukten durch Redoxreaktionen verhindert. Für die Dehydratation von 19 Verbindungen wurden kinetische Parameter abgeleitet.Die Gültigkeit eines linearen kinetischen Kompensationsgesetzes wurde beobachtet. Die Abhängigkeit kinetischer Kompensationsparameter von der Beschaffenheit des thermischen Vorganges wird erörtert.РезюмеИсследован терморас пад 22 производных комплексов типа [М(ен)3] Х3. Реакция, приводящая к образов анию комплексов типа [М(ен)3] Х3X, имеетместо в случае Сr (III) комплексов, в которыхX=Cl, Br, I илиNCS, в случае же производныхСо (III) эта реакция возможна тол ько приX=Сl. В других сл учаях окислительно-восста новительные реакции мешают образ ованию стабильных пр омежуточных соединений. Рассчита ны кинетические параметры дегидрата ции 19 соединений.Обнаружена справедл ивость закона линейн ой кинетической компен сации. Обсуждается зависимость парамет ров кинетической ком пенсации от характера термическ ого процесса.

Urinary calculi: review of classification methods and correlations with etiology.

Abstract: Current physical and chemical methods available for urinary stones analysis are critically reviewed. No one method is sufficient to provide all the clinically useful information on the structure and composition of the stones. We show that a combination of refined morphological and structural examination of stone with optical microscopy, complemented by compositional analysis using infrared spectroscopy of the core, cross-section and surface of calculi, provides a precise and reliable method for identifying the structure and crystalline composition, and permits quantification of stone components while being highly cost effective. Using such morphoconstitutional studies leads to a classification of urinary stones in seven distinctive types and twenty-one subtypes among monohydrate (whewellite) and dihydrate (weddellite) calcium oxalates, phosphates, uric acid, urates, protein, and cystine calculi. Furthermore, all of the recognized sub-types exhibit correlations with specific pathophysiologic conditions. We conclude that such morphoconstitutional refined analysis and classification of urinary calculi is of interest to properly identify the type of stone disease and provides clues to etiopathogeny.