Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1916. / The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed April 30, 2009)

Thesis (Ph. D.)--University of Hong Kong, 2010. / Includes bibliographical references (leaves 179-192). Also available in print.

Thesis (M.S. - Geology)--University of Arizona, 1968. / Includes bibliographical references (leaves p.28).

Thesis (Ph. D.)--Lehigh University, 1998. / Includes vita. Includes bibliographical references (leaves 168-180).

Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2013-04-23T13:25:50Z No. of bitstreams: 1 Rodrigo Albuquerque.pdf: 737432 bytes, checksum: 3351ed8449f3bb0f3c8410fe64500d25 (MD5) / Made available in DSpace on 2013-04-23T13:25:50Z (GMT). No. of bitstreams: 1 Rodrigo Albuquerque.pdf: 737432 bytes, checksum: 3351ed8449f3bb0f3c8410fe64500d25 (MD5) Previous issue date: 2006 / Recentemente, o desenvolvimento de tecnologias eficientes visando à redução dos óxidos de nitrogênio, em regeneradores de unidades de craqueamento catalítico em leito fluidizado, tem se tornado uma grande preocupação, devido aos rigorosos limites de emissão impostos pela legislação ambiental. Como a maioria das refinarias utiliza promotores de combustão, os catalisadores de redução devem operar em presença de monóxido de carbono e devem ser capazes de remover ambos os poluentes. Os óxidos metálicos suportados têm sido considerados como substituintes apropriados para os catalisadores à base de metais nobres. Entre eles, o cobre tem sido apontado como uma espécie ativa muito atrativa para a reação. Além disso, observou-se que a adição de um segundo metal melhora o desempenho catalítico dos materiais e que o suporte desempenha um papel importante na reação. Considerando estes aspectos, neste trabalho foi estudada a influência de diferentes suportes (ZrO2, CeO2 e ZrO2 -CeO2), no desempenho de catalisadores à base de cobre e ferro na redução catalítica de óxidos de nitrogênio usando monóxido de carbono como agente redutor. Os suportes foram preparados por técnicas de precipitação e os metais foram impregnados a partir de soluções de acetato de cobre e nitrato de ferro, seguido de calcinação a 450ºC. As amostras foram caracterizadas por análise química, análise térmica diferencial, termogravimetria, difração de raios X, medida de área superficial específica, espectroscopia por reflectância difusa na região do ultravioleta e visível, espectroscopia no infravermelho por transformadas de Fourier de monóxido de carbono quimissorvido, redução por hidrogênio à temperatura programada e espectroscopia fotoeletrônica de raios X. Os catalisadores foram avaliados, na faixa de 150 a 500ºC, na redução do óxido nítrico com monóxido de carbono. Observou-se que o suporte à base de zircônio era constituído das fases tetragonal e monoclínica e o óxido de cério da fase cúbica. Foi observado que o cério estabilizava a fase tetragonal do óxido de zircônio no suporte misto. Em todas as amostras, as áreas superficiais específicas foram próximas a 100 m2.g-1. Os resultados de XPS mostraram que o estado de oxidação do cobre era função do suporte usado. Entretanto, independente do suporte utilizado, a adição de ferro modificou as propriedades químicas do cobre favorecendo a formação de espécies mais redutíveis na superfície do catalisador. Os catalisadores contendo os dois metais mostraram-se mais ativos, seguidos por aqueles contendo ferro e cobre. O desempenho superior do catalisador bimetálico suportado em óxido de cério foi atribuído à capacidade dos metais em facilitar o ciclo redox, que ocorre durante a reação de redução do óxido nítrico com monóxido de carbono. / Salvador

<p>&nbsp;&nbsp; U ovoj doktorskoj disertaciji opisane su sinteze novih kompleksa prelaznih metala sa piridoksiliden-&nbsp; (PLAG), odnosno saliciliden-aminogvanidinom (SALAG). Dobijeni<br />kompleksi su okarakterisani elementalnom analizom, IR spektrima, konduktometrijskim i magnetnim merenjima, a većina i rendgenskom<br />strukturnom analizom. Osim toga, dobijene su i nove forme ovih &Scaron;ifovih baza, i to u vidu monokristala, čime su omogućena ispitivanja njihovih&nbsp; molekulskih i kristalnih struktura, kao i uporedna analiza sa koordinovanim ligandima.<br />&nbsp; &nbsp; Sa PLAG je sintetisano 7 novi&nbsp; kompleksa Cu(II), a pored toga po prvi put su<br />izolovani mono i bis(ligand) kompleksi Fe(III) i Co(III), mono(ligand) kompleksi&nbsp; V(V), kao&nbsp; i jedan kompleks Zn(II) u kojem ovaj potencijalno tridentatni&nbsp;<em> ONN&nbsp;</em> ligand,&nbsp; u<br />monoprotonovanoj formi,&nbsp; ima ulogu kontra-jona. Sa stanovi&scaron;ta geometrije zajedničko za izolovane komplekse Cu(II) i V(V) je da imaju kvadratno-piramidalnu strukturu, sa izuzetkom jednog kvadratno-planarnog kompleksa Cu(II), dok je u kompleksima Fe(III) i Co(III) nađeno očekivano oktaedarsko okruženje centralnog<br />jona. Pored ovih, sintetisano je i pet novih kompleksa sa SALAG, od kojih su dva<br />kompleksa Cu(II) i kompleks V(V) okarakterisani rendgenskom strukturnom<br />analizom, dok je mikrokristalnim bis(ligand) kompleksima Co(III) i Ni(III) na osnovu<br />fizičko-hemijskih karakteristika predložena odgovarajuća struktura.<br />&nbsp;&nbsp; Zajedničko za obe opisane &Scaron;ifove baze je da se koordinuju na&nbsp;<em> ONN&nbsp; </em>tridentatni način, i to preko atoma kiseonika deprotonovane fenolne grupe i atoma azota azometinske i imino grupe AG fragmeta. Posebno je nagla&scaron;eno da su&nbsp; sa<br />PLAG izolovana dva dimerna kompleksa Cu(II) u kojima je po prvi put nađena tetradentatna koordinacija ovog&nbsp; liganda, u koju je dodatno uključen atom kiseonika hidroksimetil-grupe PL-ostatka. Za razliku od SALAG, koji je u izolovanim kompleksima koordinovan isključivo kao monoanjon, nastao deprotonacijom fenolne<br />OH-grupe, za PLAG je osim ove, potvđena koordinacija u neutralnoj, zwitter-jonskoj, ali i dvostruko deprotonovanoj formi. Zwitter-jonska forma liganda nastaje migracijom atoma vodonika sa fenolnog hidroksila na piridinski atom azota PL-ostatka, dok deprotonacijom piridinskog ili hidrazinskog atoma azota, odnosno oba pomenuta atoma nastaju monoanjon i dianjon helatnog liganda, respektivno.<br />&nbsp;&nbsp; Na kraju, urađena su&nbsp; i ispitivanja antimikrobne aktivnosti odabranih jedinjenja<br />prema predstavnicima grampozitivnih i gramnegativnih bakterija, kao i dve kulture<br />kvasca. Tom prilikom nije utvrđena nikakva inhibitorna aktivnost&nbsp;&nbsp; prema primenjenim<br />bakterijskim sojevima, dok su u slučaju kvasaca izvesno mikrobicidno dejstvo pokazali samo kompleksi Cu(II).</p> / <p>This PhD thesis describes the syntheses of some new transition metal complexes with&nbsp; pyridoxilidene-&nbsp; (PLAG) and salicylideneaminoguanidine (SALAG). Obtained&nbsp; complexes are characterized by&nbsp;&nbsp; elemental analysis, IR&nbsp; spectroscopy,&nbsp; conductometric and magnetic measurements. Besides, the structural analysis of majority of the obtained complexes was performed. Some new forms of these Schiff&nbsp; bases are synthesized in form of single crystals, which made their X-ray analysis as well as comparison with coordinated forms possible.</p><p>With PLAG, 7 new Cu(II) complexes were obtained and for the first time mono and bis(ligand) complexes of Fe(III) and Co(III) as well&nbsp; mono(ligand)&nbsp; complexes&nbsp; of V(V) were isolated. Furthermore,&nbsp; the structure of Zn(II) complex in which PLAG in its monocationic form has a role of counter ion is presented. With the exception of one Cu(II) complex, all reported Cu(II) and V(V) complexes have a square-pyramidal geometry, whilst&nbsp; Fe(III)&nbsp; and Co(III)&nbsp; are situated in octahedral surroundings. Also, five new complexes of Cu(II), Co(III), Ni(II) and V(V) with SALAG were synthesized. In both&nbsp; Cu(II) complexes and V(V) complex the expected coordination mode and geometry were confirmed by X-ray analysis, while octahedral structure of bis(ligand) complexes with Co(III) and Ni(II) was proposed based on results of physico-chemical&nbsp; characterization.</p><p>Both PLAG and SALAG coordinate the metal ion in tridentate&nbsp; ONN&nbsp; manner, through the oxygen atom of deprotonated phenolic group and nitrogen atoms&nbsp; of azomethine and imino groups of AG moiety. It is also emphasized that in two dimeric Cu(II) complexes with PLAG tetradentate coordination mode was found, in which the oxygen atom of hydroxymethyl group of PL residue was additionally involved. Unlike SALAG, which is coordinated as monoanion in all of the examined complexes, PLAG can have one of three degrees of deprotonation. Zwitter-ion of PLAG is formed by migration of H-atom from phenolic oxygen to pyridine nitrogen, while the deprotonation of pyridine or/and hydrazine nitrogen, makes it mono-and dianion, respectively.</p><p>Also, microbiological tests on the selected compounds were preformed. Namely, antimicrobial activity of these compounds against some gram-positive and gram-negative bacteria, as well as some yeast cultures was examined and none of the samples showed antimicrobial activity against bacteria, whilst only Cu(II) complexes showed certain inhibitory effect against yeasts.</p>

Gegenstand der vorliegenden Arbeit ist die Oberflächenmodifizierung von drei industriell bedeutenden Metallen, Eisen, Zink und Kupfer, sowie den Oxiden von Zink und Eisen, mit wasserlöslichen Polyvinyl-formamid-Polyvinylamin-Copolymeren (PVFA-co-PVAmen). Der Einfluss des pH-Wertes, des Hydrolysegrades der PVFA-co-PVAme, und der Einfluss von im wässrigen Medium ablaufenden Redoxprozessen an den Metalloberflächen auf die adsorbierte Polymermenge, wurden studiert. Ferner werden polymeranaloge Reaktionen des PVAms bzw. PVAm-modifizierter Metall- und Metalloxidpulver mit Kohlendioxid, ein Multischichtaufbau mit PVAm und Natriumpolyacrylat, als auch die Hydrophobierung durch Maleinsäureanhydridcopolymere beschrieben. Zur Charakterisierung der polymermodifizierten Oberflächen wurde die XPS, die DRIFT-Spektroskopie und die Sorptiochromie genutzt. Besonders der Sorptiochromie wurde aufgrund der hohen Sensitivität ein hoher Stellenwert in der vorliegenden Arbeit eingeräumt. Das Konzept der Sorptiochromie wurde zum ersten Mal auf Metalloberflächen angewendet. Ein zweiter zentraler Aspekt der Arbeit war deshalb die Suche nach Sondenmolekülen, die geeignet waren Polaritätsparameter farbiger Metalloxid- und Metallpulver zu ermitteln. Hierfür wurden das solvatochrome und acidochrome Verhalten, sowie die Wechselwirkungen von Barbituratfarbstoffen mit Merocyaninstruktur mit Metallionen, Metall- und Metalloxidoberflächen studiert.

The present thesis describes the synthesis and characterization of magnesium, copper, and iron complexes and their application in the MOCVD (Metal-Organic Chemical Vapor Deposition) process, as well as the synthesis and characterization of yttrium and gadolinium complexes and their use as spin-coating precursors for metal oxide thin layer formation. The objective of this scientific work is the development of the family of bis(β-ketoiminato) magnesium(II) complexes and a series of heteroleptic β-ketoiminato copper(II) precursors for the formation of magnesium oxide and copper/copper oxide layers by using the MOCVD process. Modifications of the ketoiminato ligands affect the physical and chemical properties of the respective complexes. Another central theme of this work is the development of β-diketonato iron(III) complexes for the deposition of carbon-free gamma- and alpha-Fe2O3 layers via MOCVD. The thermal behavior and vapor pressure of the precursors could be influenced by the variation of the β-diketonate ligands. In addition, the synthesis and characterization of yttrium and gadolinium β-diketonates and their use as spin-coating precursors are described. Field-effect transistors were successfully fabricated by the deposition of carbon nanotubes on top of the Y2O3 films.