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László Szebellédy
László Szebellédy (20 April 1901 – 23 January 1944) was a Hungarian chemist who contributed to electrochemistry Electrochemistry is the branch of physical chemistry concerned with the relationship between Electric potential, electrical potential difference and identifiable chemical change. These reactions involve Electron, electrons moving via an electronic ... with the development of Coulometric analytical techniques for detecting small quantities of chemicals with precision. He served as a professor at the Pázmány Péter University. Szebellédy was born in Rétság and went to the Pázmány Péter University where he studied pharmacy, and obtained a doctorate in 1926. He then joined as an assistant to Professor Lajos Winkler (1863–1939). In 1933 he became an assistant professor. He went to Zurich, Dresden and Leipzig, working at the laboratories of W. D. Treadwell, Max Le Blanc (1865-1943) and Wilhelm Böttger (1871–1949). In 1935-36 he taught chemical analysis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrochemistry
Electrochemistry is the branch of physical chemistry concerned with the relationship between Electric potential, electrical potential difference and identifiable chemical change. These reactions involve Electron, electrons moving via an electronically conducting phase (typically an external electrical circuit, but not necessarily, as in Electroless nickel-phosphorus plating, electroless plating) between electrodes separated by an ionically conducting and electronically insulating electrolyte (or ionic chemical species, species in a Solution (chemistry), solution). When a chemical reaction is driven by an electrical Voltage, potential difference, as in electrolysis, or if a potential difference results from a chemical reaction as in an electric battery or fuel cell, it is called an ''electrochemical'' reaction. Unlike in other chemical reactions, in electrochemical reactions electrons are not transferred directly between atoms, ions, or molecules, but via the aforementioned electron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coulometry
In analytical electrochemistry, coulometry is the measure of charge (Coulomb, coulombs) transfer during an Electrochemistry, electrochemical Redox, redox reaction. It can be used for precision measurements of charge, but coulometry is mainly used for analytical applications to determine the amount of matter transformed. There are two main categories of coulometric techniques. Amperostatic coulometry, or coulometric titration keeps the current (electricity), current constant using an amperostat. Potentiostatic coulometry holds the electric potential constant during the reaction using a potentiostat. History The term coulometry was introduced in 1938 by Hungarian chemist László Szebellédy and Zoltan Somogyi. Coulometry is the measure of charge, thus named after its unit the coulomb. Michael Faraday, known for his work in electricity and magnetism, made critical contributions to the field of electrochemistry. He discovered the Faraday's laws of electrolysis, laws of electroly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pázmány Péter Catholic University
Pázmány Péter Catholic University (PPKE) ( (''PPKE'')) is a private university in and near Budapest, Hungary, belonging to the Catholic Church in Hungary, Catholic Church and recognized by the state. While PPKE takes its name after an institution founded in 1635, it forms a modern, split-off limb from one of Hungary's oldest and most prestigious List of universities and colleges in Hungary, institutions of higher education, that has expanded further in the second half of the 20th century. The Faculty of Theology was established by archbishop Péter Pázmány, as part of a new university, in Trnava, Nagyszombat, the Kingdom of Hungary (today Trnava, Slovakia) in 1635 (the original university church is now the St. John the Baptist Cathedral (Trnava), Cathedral of Trnava). This university was transferred to the present-day Budapest in 1777 and named after Pázmány in 1921. In 1950, the university was renamed to Eötvös Loránd University, but in the same year, the government ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rétság
Rétság is a small town in Nógrád (county), Nógrád county, in Hungary. Location Rétság is located north of the capital Budapest on the E77 European main road, halfway between Vác and Balassagyarmat. The town is located at the border of Cserhát and Börzsöny hills. Its location determines the function of the town. History The settlement was the property of the Losonczy family in 1393, when its name was Réthy Saag. The Ottoman Empire, Ottoman conquest started in the middle of the 16th century (when castle Nógrád was captured by the Ottoman army) and lasted till the middle of the 17th century. During the Ottoman rule, Rétság became near totally desolated.Big landowners was in Rétság: Mehmed Daud 1562–1563, Ottoman from liva of Hussein pasha 1566–1567, Bosna Hassan 1583–1584, Gábor Lónyai 1656, Paul Sréter and his family 1770, widow count Mrs. Béla Benyovszky, Sándor Rosenbach, Frigyes Herzfeld in 1910. The St. Andrew Roman Catholic church was built in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lajos Winkler
Lajos Winkler (May 21, 1863 – April 14, 1939) was a Hungarian analytical chemist. He is best known today for his discovery of the Winkler method for the measurement of oxygen dissolved in water. Life Relatively little is in print in English concerning the life of Lajos Winkler. Winkler studied science at the Budapest University of Science, receiving his doctorate there in 1890, while working with Carl von Than. He stayed on to work as a lecturer, among other positions, and directed the Institute of Chemistry, starting in 1909, for more than 25 years. He is said to have published several hundred papers, to have helped found the ''Hungarian Journal of Chemistry'', and to have been a member of the Hungarian Academy of Sciences. See also the study of Vamos for more information and references. Dissolved oxygen Natural water contains molecular oxygen (O2), necessary for life in ponds, rivers, and so on. A common nineteenth-century test for determining dissolved oxygen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Max Le Blanc
Max Julius Louis Le Blanc (1865 – 1943) was a German physical chemist who worked in the field of electrochemistry, writing an influential textbook in 1895 on the subject which went through several editions. He was a professor at the Technical University of Karlsruhe, later at the Wilhelm Ostwald Institute at Leipzig. He is best known for inventing the hydrogen electrode used for pH measurements. In 1933 he was a signatory to the Vow of allegiance of the Professors of the German Universities and High-Schools to Adolf Hitler and the National Socialistic State. Life and work Le Blanc was born on 26 May 1865 in Barciany, Barten, Kingdom of Prussia to builder Louis and his wife Marie Kickton and after studying at the Gymnasium in Kętrzyn, Rastenburg, he went to the universities at Tübingen and Berlin. His doctoral work of 1888 was on organic chemistry under August Wilhelm von Hofmann. He however moved to physical chemistry and worked under Wilhelm Ostwald at Leipzig from 1891. He ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Faraday's Laws Of Electrolysis
Faraday's laws of electrolysis are quantitative relationships based on the electrochemical research published by Michael Faraday in 1833. First law Michael Faraday reported that the mass () of a substance deposited or liberated at an electrode is directly proportional to the charge (, for which the SI unit is the ampere-second or coulomb). m \propto Q \quad \implies \quad \frac = Z Here, the constant of proportionality, , is called the electro-chemical equivalent (ECE) of the substance. Thus, the ECE can be defined as the mass of the substance deposited or liberated per unit charge. Second law Faraday discovered that when the same amount of electric current is passed through different electrolytes connected in series, the masses of the substances deposited or liberated at the electrodes are directly proportional to their respective chemical equivalent/ equivalent weight (). This turns out to be the molar mass () divided by the valence () : \begin & m \propto E; \quad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1901 Births
December 13 of this year is the beginning of signed 32-bit computing, 32-bit Unix time, and is scheduled to end in Year 2038 problem, January 19, 2038. Summary Political and military 1901 started with the Federation of Australia, unification of multiple Crown colony, British colonies in Australia on January 1 to form the Australia, Commonwealth of Australia after a 1898–1900 Australian constitutional referendums, referendum in 1900, Subsequently, the 1901 Australian federal election, 1901 Australian election would see the first Prime Minister of Australia, Australian prime minister, Edmund Barton. On the same day, Nigeria became a Colonial Nigeria, British protectorate. Following this, the Victorian era, Victorian Era would come to a end after Queen Victoria died on January 22 after a reign of 63 years and 216 days, which was List of monarchs in Britain by length of reign, longer than those of any of her predecessors, Her son, Edward VII, succeeded her to the throne. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1944 Deaths
Events Below, the events of World War II have the "WWII" prefix. January * January 2 – WWII: ** Free France, Free French General Jean de Lattre de Tassigny is appointed to command First Army (France), French Army B, part of the Sixth United States Army Group in North Africa. ** Landing at Saidor: 13,000 US and Australian troops land on Papua New Guinea in an attempt to cut off a Japanese retreat. * January 8 – WWII: Philippine Commonwealth troops enter the province of Ilocos Sur in northern Luzon and attack Japanese forces. * January 11 ** United States President Franklin D. Roosevelt proposes a Second Bill of Rights for social and economic security, in his State of the Union address. ** The Nazi German administration expands Kraków-Płaszów concentration camp into the larger standalone ''Konzentrationslager Plaszow bei Krakau'' in occupied Poland. * January 12 – WWII: Winston Churchill and Charles de Gaulle begin a 2-day conference in Marrakech. * Janua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
