Global ETD Search

1	Oleum für die Industrie Haustein, Mike 04 October 2016 (has links) (PDF) Im Oktober 1875 erschien Clemens Winklers Schlüsselpublikation zum Schwefelsäure-Kontaktverfahren. Der Freiberger Chemiker lieferte nicht nur die wesentlichen Grundlagen des Prozesses, sondern initiierte eine Entwicklung, die der chemischen Industrie ein modernes Produktionsverfahren für eine wichtige Grundchemikalie in die Hand gab und damit ihre Entwicklung entscheidend beförderte. Neben Winklers Leistungen werden auch die bisher wenig gewürdigten Anstrengungen der Freiberger Hüttenwerke herausgestellt, denen es nach einigen Umwegen 1879 gelungen war, die erste wirklich funktionsfähige Kontaktanlage in Betrieb zu nehmen. Oleum Schwefelsäure Kontaktverfahren Clemens Winkler Muldenhütten Oleum. sulfuric acid contact process Clemens Winkler Muldenhütten ddc:540 rvk:VB 3362
2	Oleum für die Industrie Haustein, Mike January 2015 (has links) Im Oktober 1875 erschien Clemens Winklers Schlüsselpublikation zum Schwefelsäure-Kontaktverfahren. Der Freiberger Chemiker lieferte nicht nur die wesentlichen Grundlagen des Prozesses, sondern initiierte eine Entwicklung, die der chemischen Industrie ein modernes Produktionsverfahren für eine wichtige Grundchemikalie in die Hand gab und damit ihre Entwicklung entscheidend beförderte. Neben Winklers Leistungen werden auch die bisher wenig gewürdigten Anstrengungen der Freiberger Hüttenwerke herausgestellt, denen es nach einigen Umwegen 1879 gelungen war, die erste wirklich funktionsfähige Kontaktanlage in Betrieb zu nehmen. info:eu-repo/classification/ddc/540 ddc:540
3	PREPARATION, CHARACTERIZATION AND APPLICATIONS OF FUNCTIONALIZED CARBON NANO-ONIONS Sreeramoju, Mahendra K 01 January 2013 (has links) Carbon nano-onions (CNOs) discovered by Ugarte in 1992 are multi-layered fullerenes that are spherical analogs of multi-walled carbon nanotubes with diameters varying from 6 nm to 30 nm. Among the various methods of synthesis, CNOs prepared by graphitization of nanodiamonds (N-CNOs) and underwater electric arc of graphite rods (A-CNOs) are the subject of our research. N-CNOs are considered as more reactive than A-CNOs due to their smaller size, high curvature and surface defects. This dissertation focuses on structural analysis and surface functionalization of N- CNOs with diameters ranging from 6—10 nm. Synthetic approaches such as oleum- assisted oxidation, Freidel-Crafts acylation and Billups reductive alkylation were used to functionalize N-CNOs to improve their dispersion properties in aqueous and organic solvents. Functionalized N-CNOs were characterized using various techniques such as TGA, TG-MS, Raman spectroscopy and pH-titrimetry. We designed an experimental method to isolate polycyclic aromatic adsorbates formed on the surface of oleum oxidized N-CNOs (ON-CNOs) and characterized them. A-CNOs, on the other hand are bigger than N-CNOs with diameters ranging from 20—40 nm. In this dissertation, we discuss the preparation of graphene structures by unzipping of A-CNOs using KMnO4 as oxidizing agent. These graphene structures were characterized using powder X-ray diffraction, TGA, BET nitrogen adsorption/desorption studies and compressed powder conductivity. This dissertation also focuses on lithiation/delithiation studies of N-CNOs, A- CNOs and A-CNO-derived graphene structures to use them as negative electrode materials in lithium-ion batteries. The cycling performances of these materials at a charge/discharge rate of C/10 were discussed. The cycling performance of N-CNOs was tested at faster charge/discharge rate of C. Nano-onions oleum-assisted oxidation Friedel-Crafts acylation graphene lithium ion batteries Inorganic Chemistry Materials Chemistry
4	Homoatomic cations: From [P₅]⁺ to [P₉]⁺ Frötschel-Rittmeyer, Julia, Holthausen, Michael, Friedmann, Christian, Röhner, David, Krossing, Ingo, Weigand, Jan J. 04 April 2024 (has links) Recent synthetic approaches to a series of [P₉]X salts (X = [F{Al(ORꜰ)₃}₂], [Al(ORꜰ)₄], and (Rꜰ = C(CF₃)₃); Ga₂Cl₇) overcome limitations in classical synthesis methods that proved unsuitable for phosphorus cations. These salts contain the homopolyatomic cation [P₉]⁺ via (I) oxidation of P₄ with NO[F{Al(ORꜰ)₃}₂], (II) the arene-stabilized Co(I) sandwich complex [Co(arene)₂][Al(ORꜰ)₄] [arene = ortho-difluorobenzene (o-DFB) and fluorobenzene (FB)], or (III) the reduction of [P₅Cl₂][Ga₂Cl₇] with Ga[Ga₂Cl₇] as Ga(I) source in the presence of P₄. Quantum chemical CCSD(T) calculations suggest that [P₉]⁺ formation from [Co(arene)2]⁺ occurs via the nido-type cluster [(o-DFB)CoP₄]⁺, which resembles the isoelectronic, elusive [P₅]⁺. Apparently, the nido-cation [P₅]⁺ forms intermediately in all reactions, particularly during the Ga(I)-induced reduction of [P₅Cl₂]⁺ and the subsequent pick up of P₄ to yield the final salt [P₉][Ga₂Cl₇]. The solid-state structure of [P₉][Ga₂Cl₇] reveals the anticipated D₂d-symmetric Zintl-type cage for the [P₉]⁺ cation. Our approaches show great potential to bring other [Pn]⁺ cations from the gas to the condensed phase. info:eu-repo/classification/ddc/500 ddc:500
5	Removing Reds from the Old Red Scar: Maintaining and Industrial Peace in the East Tennessee Copper Basin from the Great War through the Second World War Simson, William Ronald 19 March 2010 (has links) This study considers industrial society and development in the East Tennessee Copper Basin from the 1890s through World War II; its main focus will be on the primary industrial concern, Tennessee Copper Company (TCC 1899), owned by the Lewisohn Group, New York. The study differs from other Appalachian scholarship in its assessment of New South industries generally overlooked. Wars and increased reliance on organic chemicals tied the basin to defense needs and agricultural advance. Locals understood the basin held expanding economic opportunities superior to those in the surrounding mountains and saw themselves as participants in the nation’s industrial and economic progress, and a vital part of its defense. The study upends earlier scholarship contending local industrial concerns acted proactively to challenges from farmers harmed by industrial pollution; investigation shows firms hesitated to initiate new production processes and manipulated local elections. Partisan developments woven amid all this underscore errors in assuming ancient regional affinity for Republicans. Confederate heritage gave Democrats an historic advantage that fractured before New Deal progressivism and expanding basin Republican power. Markets forced basin firms to merge and embrace technological change affecting working people’s relationships, forcing workers to improve skills or settle for low-skill jobs. Excepting TCC managers and supervisory staff, provincialism ruled; suspicions and competitiveness among workers grew as most miners lived a few scattered villages and most managers and craftsmen settled in the basin’s “Twin-cities” district. Early union efforts collapsed before union mismanagement, rational management and a company union based upon Sam Lewisohn’s ideals. Management managed to wrest control of its industrial relations despite the effects of Depression and the New Deal’s empowerment of workers. Workers’ infighting, reflecting neighborhood demographics and ideological differences, benefitted TCC; it convinced locals TCC could best protect industrial peace. The submissive AFL union installed fit of ownership’s nationally recognized program for industrial relations reliant on federal power. After competition crippled local industry, locals continued their reliance on government: to investigate the medical consequences of extraction work and coordinate environmental restoration. Recent regional anti-government populism makes the basin’s peculiar historic reliance on federal help engaging. Ducktown Chemical and Iron Ducktown Tennessee J.N. Houser Polk County Mill and Smelter Workers Strike parades Tennessee American Federation of Labor “Loma Dust” pesticide “Loma” Brand plant food oleum Tennessee Non-ferrous industry Georgia Tennessee Fannin County Tennessee Isabella Tennessee Copperhill Tennessee Smelter Hill McCaysville Tennessee Copper Company Tennessee Company Broughton Biggs Lewisohn Group Sam. A. Lewisohn Adolph Lewisohn Tennessee Corporation Tennessee Copper and Chemical Lamar Weaver Robert E. Barclay Mitchell C. Anderson T.A. Mitchell Copper and Iron International Union of Mine Ducktown Sulphur History

1

Page generated in 0.0214 seconds