Tesi sul tema "Chemistry [mesh]"
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Messenbock, Reinhard Christoph. "Rapid pyrolysis and gasification of coal in a high-pressure wire-mesh reactor". Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/7740.
Testo completoHeer, Joseph Michael. "FDTD Modeling of the Spectroscopy and Resonances of Thin Films and Particles on Plasmonic Nickel Mesh". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1293754711.
Testo completoCilwa, Katherine Elizabeth. "Surface Plasmon Polaritons and Single Dust Particles". The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1301074124.
Testo completoRodriguez, Kenneth Ralph. "The extraordinary infrared transmission of metal microarrays for enhanced absorption spectroscopy of monolayers, nanocoatings, and catalytic surface reactions". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1189549712.
Testo completoAratani, Naoki. "Chemistry of meso-meso linked porphyrin arrays". 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/73207.
Testo completoKitano, Masaaki. "Chemistry of meso-Free Subporphyrins". 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215329.
Testo completoTsurumaki, Eiji. "Chemistry of meso-Aryl-Substituted Subporphyrins". 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180636.
Testo completoSuzuki, Masaaki. "Chemistry of meso-aryl substituted hexaphyrins(1.1.1.1.1.1)". 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136786.
Testo completoHau, Lap Wing. "Electrokinetically-driven liquid flows in microchannels using surface-chemistry technology /". View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?MECH%202005%20HAU.
Testo completoLee, Gary Peter. "Enantioselective #alpha#-deprotonation/rearrangement of meso-epoxides". Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298271.
Testo completoOzturk, Orhan. "Synthesis and characterisation of novel meso-naphthyl porphyrins". Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302081.
Testo completoRocha, Lucas Alonso [UNESP]. "Materiais meso-estruturados luminescentes". Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/105768.
Testo completoPartículas esféricas de sílica mesoporosa foram obtidas a partir da síntese “template” pelo processo de pirólise de aerossol. O processo foi otimizado para a obtenção de materiais mesoporosos sem resíduos orgânicos e preparados em uma única etapa, eliminando assim, a longa etapa de remoção do surfactante na metodologia tradicional (tratamento térmico ou extração soxhlet, podendo durar dezenas de horas). A otimização do processo de pirólise de aerossol proposta nesta tese reduziu este tempo para apenas alguns minutos. Os materiais apresentaram uma área superficial (BET) de até 1028 m2 .g-1 , com volume de poros (BJH) de 0,58 cm3 .g-1 . Os difratogramas de raios-X indicaram um alto grau de organização com um arranjo hexagonal de poros, confirmado também pela microscopia eletrônica de transmissão. Além disto, bandas características de grupos orgânicos não foram observadas nos espectros de absorção na região do infra-vermelho para as amostras obtidas acima de 600ºC. Amostras dopadas com íons Eu3+ também foram preparadas durante a tese. A análise por espectroscopia de luminescência, para íons Eu3+ , indicou que o íon está encapsulado nos canais mesoporosos sem prévia modificação química da matriz. Posteriormente, moléculas de 1,10- Fenantrolina foram coordenadas ao íon Eu3+ aumentando a faixa espectral de excitação do íon (efeito antena). Além disto, partículas luminescentes também foram obtidas pela incorporação do complexo Eu(fod)3 ou rodamina-B nos poros das matrizes. Finalmente, testes de recobrimento (core shell, SiO2 mesoporoso-SiO2) das partículas luminescentes foram realizados e os resultados indicaram que independentemente da espessura obtida pelo processo de recobrimento, o grau de organização dos poros e a fotoluminescência não sofreram alterações
Spherical mesoporous silica particles were obtained using the template synthesis by spray pyrolysis process. The process was optimized for the preparation of the mesoporous materials in one-pot route without organic residues, eliminating thus, the long process of removal of the surfactant, usually used in the available methods (heat treatment or soxhlet extraction, which require several hours or days). The one- pot route proposed in this thesis reduced the extraction process to only a several minutes. These materials presented a surface area value (BET) of 1028m2 .g-1 and pore volume (BJH) was 0,58 cm3 .g-1 . The X-ray diffraction patterns and the transmission electronic micrographs show an ordered typical p6mm 2D hexagonal mesostructure. Characteristics bands of organic groups were not observed in the infra-red absorption spectra for the samples obtained at 600ºC. Moreover, SiO2 mesoporous doped with Eu3+ ions were also prepared. Luminescence data suggest that the Eu3+ ions were successful encapsulated into the channels of mesoporous silica without any preliminary chemical modification of the matrix. Moreover, extra ligands such as 1,10-Phenantroline can be further coordinated, increasing the spectral range excitation (antenna effect). Furthermore, luminescent particles were also prepared by the wet impregnation of Eu(fod)3 complex and rhodamine-B molecules. Finally, tests of coating (core shell, SiO2 mesoporous-SiO2) of luminescent particles had been carried through and the The results obtained show spherical shape and the observation of a highly ordered hexagonal array of mesochannels further confirms the 2D hexagonal p6m structure. Luminescence results reveal that rhodamine-B has been successfully encapsulated into the channels of mesoporous particles. Silica coating has been observed in TEM measurements
Rossi, Emiliano. "Micro/Meso-Structured Reactors for Chemical Synthesis: Applications in Materials Science and Medicinal Chemistry". Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422956.
Testo completoLa tematica di ricerca affrontata nel corso del presente progetto di Dottorato è stata l’applicazione di tecnologie microfluidiche per lo sviluppo di nuove metodologie sintetiche. In particolare, sono state studiate molecole con potenziali impieghi in chimica farmaceutica e in scienze dei materiali, con particolare enfasi sulla possibilità di applicare i processi individuati alla produzione industriale. In tale ottica è stato sviluppato, e successivamente adattato per produzioni su larga scala, un processo in flusso continuo per la produzione e l’impiego del diazometano in condizioni di sicurezza. Tale studio è stato svolto durante un periodo di tre mesi presso il Corning European Technology Center (CETC) di Avon, Francia, e i risultati ottenuti sono stati recentemente pubblicati. L’impiego di reattori a flusso è stato inoltre studiato nella sintesi molecole eterocicliche, che possano essere impiegate come farmaci oncologici. Una libreria di composti, contenenti funzionalità strutturali di tipo pirimidinamminico e 4-anilino-chinazolinico, sono stati preparati mediante sintesi multi-step in flusso continuo, in modo più efficiente e sicuro rispetto alle metodologie tradizionali. Tale ricerca è stata portata avanti in collaborazione con un partner industriale, Fabbrica Italiana Sintetici (FIS) Spa, nell’ambito del progetto FSE. Sono stati infine sviluppati processi a flusso continuo per la funzionalizzazione chimica di nanostrutture molecolari, derivate da fullereni, nanotubi di carbonio e porfirine. L’impiego di reattori in continuo in tale campo ha permesso notevoli incrementi di efficienza sintetica rispetto alle metodiche discontinue. I composti preparati hanno inoltre potenziali applicazioni nel campo dei materiali innovativi, in particolare per il fotovoltaico, l’elettronica molecolare e la sensoristica. Tali studi sono stati pubblicati in vari articoli su riviste scientifiche e hanno portato inoltre al deposito di una domanda di brevetto Italiano.
Rocha, Lucas Alonso. "Materiais meso-estruturados luminescentes". Araraquara : [s.n.], 2010. http://hdl.handle.net/11449/105768.
Testo completoOrientador: Marc Verelst
Banca: Younès Messaddeq
Banca: Oscar Manoel Loureiro Malta
Banca: Luis Antonio Ferreira Martins Dias Carlos
Banca: Marie-Joëlle Menu
Banca: Jeannette Dexpert-Ghys
Resumo: Partículas esféricas de sílica mesoporosa foram obtidas a partir da síntese "template" pelo processo de pirólise de aerossol. O processo foi otimizado para a obtenção de materiais mesoporosos sem resíduos orgânicos e preparados em uma única etapa, eliminando assim, a longa etapa de remoção do surfactante na metodologia tradicional (tratamento térmico ou extração soxhlet, podendo durar dezenas de horas). A otimização do processo de pirólise de aerossol proposta nesta tese reduziu este tempo para apenas alguns minutos. Os materiais apresentaram uma área superficial (BET) de até 1028 m2 .g-1 , com volume de poros (BJH) de 0,58 cm3 .g-1 . Os difratogramas de raios-X indicaram um alto grau de organização com um arranjo hexagonal de poros, confirmado também pela microscopia eletrônica de transmissão. Além disto, bandas características de grupos orgânicos não foram observadas nos espectros de absorção na região do infra-vermelho para as amostras obtidas acima de 600ºC. Amostras dopadas com íons Eu3+ também foram preparadas durante a tese. A análise por espectroscopia de luminescência, para íons Eu3+ , indicou que o íon está encapsulado nos canais mesoporosos sem prévia modificação química da matriz. Posteriormente, moléculas de 1,10- Fenantrolina foram coordenadas ao íon Eu3+ aumentando a faixa espectral de excitação do íon (efeito antena). Além disto, partículas luminescentes também foram obtidas pela incorporação do complexo Eu(fod)3 ou rodamina-B nos poros das matrizes. Finalmente, testes de recobrimento (core shell, SiO2 mesoporoso-SiO2) das partículas luminescentes foram realizados e os resultados indicaram que independentemente da espessura obtida pelo processo de recobrimento, o grau de organização dos poros e a fotoluminescência não sofreram alterações
Abstract: Spherical mesoporous silica particles were obtained using the template synthesis by spray pyrolysis process. The process was optimized for the preparation of the mesoporous materials in one-pot route without organic residues, eliminating thus, the long process of removal of the surfactant, usually used in the available methods (heat treatment or soxhlet extraction, which require several hours or days). The one- pot route proposed in this thesis reduced the extraction process to only a several minutes. These materials presented a surface area value (BET) of 1028m2 .g-1 and pore volume (BJH) was 0,58 cm3 .g-1 . The X-ray diffraction patterns and the transmission electronic micrographs show an ordered typical p6mm 2D hexagonal mesostructure. Characteristics bands of organic groups were not observed in the infra-red absorption spectra for the samples obtained at 600ºC. Moreover, SiO2 mesoporous doped with Eu3+ ions were also prepared. Luminescence data suggest that the Eu3+ ions were successful encapsulated into the channels of mesoporous silica without any preliminary chemical modification of the matrix. Moreover, extra ligands such as 1,10-Phenantroline can be further coordinated, increasing the spectral range excitation (antenna effect). Furthermore, luminescent particles were also prepared by the wet impregnation of Eu(fod)3 complex and rhodamine-B molecules. Finally, tests of coating (core shell, SiO2 mesoporous-SiO2) of luminescent particles had been carried through and the The results obtained show spherical shape and the observation of a highly ordered hexagonal array of mesochannels further confirms the 2D hexagonal p6m structure. Luminescence results reveal that rhodamine-B has been successfully encapsulated into the channels of mesoporous particles. Silica coating has been observed in TEM measurements
Doutor
Cilwa, Katherine E. "Surface Plasmons Polaritons and Single Dust Particles". The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1304532704.
Testo completoFennessy, Rebecca Valerie. "Synthesis of polydentate ligands and their self-assembly into helicates, meso-helicates and cyclic helicates". Thesis, University of Huddersfield, 2013. http://eprints.hud.ac.uk/id/eprint/23326/.
Testo completoCozett, Rudy Edgar. "Studies on the use of peptide auxiliaries in the meso-desymmetrization of epoxides, and the kinetic resolution of secondary alcohols". Doctoral thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/16573.
Testo completoThis thesis reports on the use of amino acids and peptides as chiral ligands/catalysts in two asymmetric processes: Meso-desymmetrization of an epoxide and the kinetic resolution of secondary alcohols. Chapter 1 comprises a literature review, which gives a general overview of methods of asymmetric synthesis, followed by an overview on the existing classes of asymmetric DMAP-type acyl-transfer catalysis as the major topic of the thesis. Chapter 2 describes the synthesis and evaluation of four peptide ligands used in combination with scandium(III) triflate for the meso-desymmetrization of cyclohexene oxide. Enantioselectivities were determined by chiral HPLC, and gave results of up to 41 % ee. Chapter 3 discusses the synthesis and characterisation of three clas ses of nucleophilic DMAP-type catalysts, in which various amino acid/peptide auxiliaries were attached either α, β, or γ-to the pyridine nitrogen. The peptides contained tryptophan, chosen to exploit a potential π - π stacking interaction with the acyl-pyridinium cation. Catalysts substituted at the α and γ positions gave no kinetic resolution for 1-(2-naphthyl)ethanol 121 ; however, a dipeptide (Leu-Trp)-containing catalyst 128 substituted at the β-position gave an s-v alue of 5.3. In order to improve the selectivity, 128 was derivatised at the C-terminal to form two tripeptide-containing catalysts, and acylated at the NH group of the indole ring (141). A range of secondary alcohols were tested and selectivity factors in creased to up to 10.7 . A series of second-generation catalysts were synthesised, but s-values did not improve. An NMR study was performed to reveal a possible conformational change during the stereoselective step. Computational modelling was performed using molecular mechanics (MMFF94) and quantum mechanics (B3LYP/6-31G, M06/6-31G*, ω B97X-D/6-31G) to determine a po ssible transition-state model, which indicated a π - cation interaction of the electron-rich indole ring of a tryptophan moiety with the electron-deficient pyridinium cation as a likely determinant of stereoselectivity.
Santos, Sabrina Gracia dos 1989. "Ligantes dipirrometenos meso-substituídos como blocos de construção em química supramolecular". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248508.
Testo completoDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-08-24T11:05:13Z (GMT). No. of bitstreams: 1 Santos_SabrinaGraciados_M.pdf: 7184130 bytes, checksum: a334f9344fec73d7b0af53f37a86c3f1 (MD5) Previous issue date: 2014
Resumo: Foram sintetizados dois ligantes 5 fenildipirrometeno (2) e 5-(4-piridil)dipirrometeno (4) através da oxidação de seus respectivos intermediários (1) e (3). Um terceiro intermediário, bisdipirrometeno (5) foi sintetizado e oxidado resultando no ligante bisdipirrometeno (6) parcialmente oxidado. Essas moléculas foram caracterizadas através das técnicas de 1HRMN e MS. Realizou-se a síntese com complexo [CulL24]que foi caracterizado por FT-IR, espectroscopia no UV-Vis e MS. Comparando-se os dados de UV-Vis com os resultados de TD-DFT, um modelo de quatro orbitais moleculares de simetria "Pi" foi proposto para a interpretação dos espectros eletrônicos dos ligantes (2), (4), e (6) e do complexo, similar ao já existente para porfirinas. Também foram estudadas via modelagem molecular três supermoléculas distintas derivadas dos ligantes sintetizados, duas lineares e uma em forma de grade. As estruturas e distâncias entre os centros metálicos (entre 12,6 A e 20,2 A) foram então comparadas
Abstract: Abstract: In this work, three ligands and its intermediaries were synthesized and caracterized (5-phenildipyrromethene (2), 5-(4-pyridil)dipyrromethene (6) and bisdipyrromethene (4)), aiming a future complexation of each one of them with transition metals to form metallic complexes. The ligands (4), (6) and its intermediaries have two coordination sites in their structures, making them interesting for coordination polymers and metal organic frameworks synthesis. The intermediaries were synthesized and caracterized by hydrogen nuclear magnetic ressonance (1H NMR) and mass spectrometry (MS). The ligands (2), (4) and (6) were obtained through the oxidation of their respectives intermediaries, with (2) and (6) being known in the literature, while there are no reports of the ligand (4). The final products were caracterized also by 1H NMR and MS. With the ligand \pyreno \ caracterized, we performed the complexation of this ligand with copper, originating the complex [Cu(4-pyrdpm)2], caracterized by infrared spectroscopy (IR), UV-Vis spectroscopy and MS. All the analyses confirmed the complex. We studied the ligands, complexes and coordination polymers with Density Functional Theory
Mestrado
Quimica Inorganica
Mestra em Química
Weber, Jens. "Meso- und mikroporöse Hochleistungspolymere : Synthese, Analytik und Anwendungen". Phd thesis, Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1599/.
Testo completoThe first part of the thesis describes the synthesis and characterisation of cross linked, mesoporous poly(benzimidazole) (PBI) prepared by a hard templating approach. Silica nanoparticles were used as template and removed after the polycondensation by immersing the hybrid material in aqueous NH4HF2 solution. The resulting mesoporous PBI showed surface areas up to 200 m²/g as established by N2 BET and porosities up to 37 vol.-%. The influence of the template and cross linker content on the observable porosity was investigated. Nitrogen sorption and small angle x-ray scattering (SAXS) were employed as analytical techniques. The template morphology was reproduced almost perfectly, yielding spherical pores of 11 nm in diameter if the samples were fully cross linked. It was shown that there is a linear dependence of the porosity on the template content up to a critical weight ratio of silica/polymer. If the silica content is raised above 50 wt.-% partial collapse of pores is observed. The dependence of the porosity on the cross linker content at constant amount of template was found to be non-linear. At the absence of any cross linker, no porosity was observed after template removal. At 10 mol-% cross linker the onset of porosity could be observed. At higher cross linker contents, the porosity was nearly the same as for the fully cross linked PBI. The mesoporous PBI could be loaded with crystalline phosphoric acid to yield highly proton conductive materials. It was shown that the material retains its nanostructure when loaded with phosphoric acid even after annealing at 180_C for 12 h. The conductivity of the nanostructured samples was one to two orders of magnitude higher than the conductivity of a nonstructured sample. The impact of the cross linking density on the conductivity was also investigated. The second part of the work describes the synthesis and characterisation of microporous poly(amide)s and poly(imide)s. 9,9'-spirobifluorene derivatives were used to introduce a rigid, structure-directing motif which prevents the polymer chains from close packing. Firstly, the synthesis of soluble poly(amide)s and poly(imide) is described. It was observed that the microporosity is strongly dependent on the processing of the soluble polymers. In the case when polymers were precipitated from solvents of high polarity no microporosity was observed, while polymers prone to solvation in solvents of lower polarity exhibited microporosity as observed in nitrogen sorption measurements. Wide angle x-ray scattering (WAXS) showed that the microstructure was indeed dependent on the processing conditions. SAXS measurements of the polymers revealed that nitrogen sorption alone is not sufficient for the analysis of the porosity. A significant mismatch between the results obtained by the two methods indicated that only a fraction of the pore volume of the polymers was accessible for nitrogen molecules. The second part of the chapter describes the synthesis, characterisation and application of spirobifluorene based, cross linked poly(amide)s and poly(imide)s. The poly(amide) networks did not show any microporosity when analysed by nitrogen sorption. This led to the conclusion that the amide bond is too weak to withstand the interfacial forces. In contrast, poly(imide) networks exhibited pronounced microporosity with surface areas of around 1000 m2/g. The analysis of these networks was again done by nitrogen sorption and SAXS. Furthermore, molecular modelling was used to calculate the true and apparent densities of the networks. In case of the poly(imide) networks, the results of the various measurement techniques were in reasonable agreement. This indicates that the pore volume was nearly completely accessible. Finally it was established that the structure directing motif is necessary to obtain microporous polymers, as a poly(imide) prepared from a spatially undefined monomer did not feature microporosity. Pressure dependent SAXS measurements showed that the polymer networks undergo significant elastic deformations upon evacuation. This behavior complicates the analysis of the nitrogen sorption data, making it impossible to extract reliable pore size distributions. The third and last part of the thesis deals with the development of a new reaction medium for the synthesis of poly(benzimidazole). An eutectic salt melt, composed of lithium chloride and potassium chloride was used in an ionothermal synthesis of linear PBI, opening a green chemistry route towards PBI. The influence of the reaction conditions on the properties of the resulting polymers was investigated. The new reaction medium allowed furthermore the synthesis of linear and cross linked spirobifluorene based PBIs. This is not easily possible by using the classical synthetic pathways towards PBI. The spirobifluorene based PBIs synthesized in this work did, however not feature intrinsic microporosity.
Ye, Fangmao. "Single molecule studies of meso/macro porous silica materials and gradient films". Diss., Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1699.
Testo completoLundell, Carl. "RESEARCH STUDY: REACTING METAL BIS(TRIMETHYL)AMIDES WITH DOUBLE-BASE PROPELLANT STABILIZERS". Master's thesis, Temple University Libraries, 2017. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/437570.
Testo completoM.A.
During World War II, it was discovered that when lead was added to double-base propellants, it produced beneficial burn rate phenomena. Specifically, the propellant burn rate first increased unexpectedly at low pressures, then the burn rate became independent of pressure, followed lastly by “mesa burning” where the burn rate actually decreased with increasing pressure. This results in a beneficial negative feedback mechanism. Over the past 75 years, researchers have explored different lead complexes to achieve better propellant performance. However, over the last decade, research has shifted to finding an alternative to using lead as an additive to reduce toxicity. Until the attempts detailed herein, researchers had not, to our knowledge attempted to combine double-base propellant stabilizers with various metals to achieve these desired results. In doing so, we prepared two lead complexes, Tetrakis (µ3-(4-methyl-3-nitrophenyl imido lead (II))) 1, and Bis(dinitrophenyl imido lead(II)) 2, that were synthesized by reacting lead bis(trimethylsilyl)amide with a common double-base propellant stabilizer 2-nitrodiphenylamine (NDPA) and 4-methyl-3-nitroaniline. Both complexes formed from protolysis of the trimethylsilylamide ligand by the acidic proton of the amine, and crystallized from tetrahydrofuran (THF). Bomb calorimetry coupled with crystal density structure determined that 1 has a very high energy density of 74.1 MJ/L, more than three times the energy density of conventional nitroamine explosives, whereas 2 was lower at 38.2 MJ/L. The structure, charge and characterization of 1 and 2 are discussed. However, each complex is air sensitive making burn rate experimentation infeasible, so any possible changes to the propellant as an additive remained undetermined. Attempts to use of tin, zinc, or bismuth bis(trimethyl)amides in place of lead, were unsuccessfully characterized, although reactions were likely observed.
Temple University--Theses
Groenewolt, Matthijs. "Mesostrukturierte Materialien durch Neue Templatsysteme und Nutzung Mesoporöser Silikate als Nano-Reaktoren". Phd thesis, Universität Potsdam, 2004. http://opus.kobv.de/ubp/volltexte/2005/251/.
Testo completoSo lassen sich aus ihrer Morphologie Rückschlüsse über die Natur der selbstorganisierten Strukturen erhalten, da der hier verwendete Abbildungsprozess selbst kleinste strukturelle Details erfasst. Die Hohlräume der synthetisierten porösen Stoffe hingegen können als winzige Reaktionsgefäße, sogenannte "Nano-Reaktoren" verwendet werden. Dies ermöglicht sowohl die Synthese von Nano-Partikeln, die auf anderem Wege nicht zugänglich sind, als auch die Möglichkeit Einflüsse der räumlichen Restriktion auf die Reaktion zu untersuchen. Besonders räumlich ausgedehnte Strukturen sollten hierbei Auffälligkeiten zeigen.
Somit ist die Gliederung der Arbeit vorgegeben:
- Die Herstellung und Charakterisierung von porösen Stoffen und selbstorganisierten Strukturen
- Ihre Verwendung als "Nano-Reaktor"
This work employs a chemical casting technique, which allows the synthesis of mesoporous materials with definite morphology and pore-size distribution. The structure is thereby determined by a self-assembled template on a nanometer length scale. By removing the template, the final mesoporous materials are formed. The materials are interesting from several points of view:
First, one can learn about the nature of self-organized structures by casting, since the process is known to map even the smallest details. Second, the porous materials can be used as "nano-reactors", both for the synthesis of nano-particles, which are not otherwise accessible, and for the investigation of the reaction itself, since reactions in very small volumes often show differences when compared with their bulk counterparts. For the synthesis of geometrically extended structures this confinement could be especially interesting.
The work therefore divides into two parts:
- The synthesis and characterisation of porous matter and self-organized structures
- Their usage as "nano-reactors"
Chin, Ami Jun-Yee. "Part A Development of a Fluorescence Resonance Energy Transfer assay or high throughput screening for catalysts in the desymmetrization of meso substrates Part B Application of hydrazide based catalyst in Friedel-Crafts alkylation". Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27118.
Testo completoHon, Sherman Siu-Man. "Calcium vapour deposition on semiconducting polymers studied by adsorption calorimetry and visible light absorption". Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/863.
Testo completoLizardi, Christopher Lee. "Aldehydic C-H Amination Reactions via Co(II)-Based Metalloradical Catalysis and Construction of Novel Chiral meso-Amidoporphyrin Ligands". Scholar Commons, 2015. https://scholarcommons.usf.edu/etd/5526.
Testo completoVan, Lankvelt Amanda L. "Protracted Magmatism within the North Caribou Terrane, Superior Province: Petrology, Geochronology, and Geochemistry of Meso- to Neoarchean TTG Suites". Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24130.
Testo completoWang, Wenfeng. "Investigation of Energy Alignment Models at Polymer Interfaces". Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5148.
Testo completoAndersson, Lovisa. "Vilken kurs är mest intressant? : Gymnasieelevers inställning till Biologi 2 och Kemi 2 med fokus på ämnesomsättning". Thesis, Högskolan Kristianstad, Fakulteten för lärarutbildning, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-19077.
Testo completoAs a future teacher in biology and chemistry in high-school it’s interesting to investigate students' attitude towards these courses. Is there a parallel between students' interest in a course and what they experience is a difficult course? To make a comparison, the study has been done based on the metabolism in Biology 2 and Chemistry 2. The purpose has been to find out what influences the high schoolers' interest in Biology 2 and Chemistry 2, and what course they find most difficult. It has also been to investigate how students describe the metabolism in both courses. The study corporate what teachers think that the students have answered on these questions. The study has been conducted through individual qualitative interviews with 20 high-school students and two teachers from a science program. The result showed that 94% of the students felt that Chemistry 2 was difficult and uninteresting. Chemistry included parts that students had difficult to relate to and to connect to their everyday lives. Biology 2 was described as more interesting as the course easier connected to their everyday life. The students' descriptions of the metabolism in both courses differed. The students described the area from the digestion of nutrients in biology, but from the respiration in chemistry. The study has given new knowledge of high-school students attitudes towards Biology 2 and Chemistry 2. To find out why the students have described the metabolism differently in both courses and why Chemistry 2 is considered a difficult course, further research is required.
Mayer, Ildemar. "Obtenção e propriedades de meso tetra(piridil)porfirinas supermoleculares e dos nanomateriais obtidos por montagem eletrostática camada por camada". Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/46/46134/tde-05062007-090328/.
Testo completoA new series of nonplanar supermolecular metalloporphyrins have been obtained by coordenative self-assembly of meso-tetra(3-pyridyl)porphyrins and ruthenium complexes such as [Ru(bipy)2Cl]+ and [Ru(bipy)2(OH2)]2+. The electronic and structural properties have been investigated by electronic spectroscopy, mass spectrometry, cyclic voltammetry, and spectroelectrochemistry. The effects of the electronic coupling and molecular geometry on the molecular and nanomaterials properties were investigated in the gas phase and in solution. All results were compared with that obtained for the planar isomers obtained by the coordination of four [Ru(bipy)2Cl] groups to the meso-tetra(4-pyridyl)porphyrins. New nanomaterials were obtained by layer-by-layer electrostatic assembly of those supermolecular cationic porphyrins and tetrasulfonated porphyrins or phthalocyanines. The electrocatalytic properties were investigated for nitrite and sulfite. Electronic and supramolecular conformational effects were observed for those species in solution and in films of the nanomaterials. Moreover, a significant effect of the pH and of the transition metal ion coordinated to the porphyrin ring on the electrocatalytic activity were also observed.
Gross, Dustin Eugene. "ITC and NMR spectroscopy binding studies of meso- octamethyl-calix[4]pyrrole and its derivatives". Thesis, 2009. http://hdl.handle.net/2152/ETD-UT-2009-05-42.
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Gonzalez, Jorge Alberto. "Part I. Spin-state isomerism in crystalline (trifluoromethanesulfonato)(meso-tetraphenylporphinato)iron(III). Part II. Toward refined model compounds for the cytochrome c oxidase active site: A new picket-fence porphyrin with short imidazole pickets". Thesis, 1991. http://hdl.handle.net/1911/16443.
Testo completoVenu, Lingampally. "Stereochemical And Synthetic Investigations". Thesis, 2013. https://etd.iisc.ac.in/handle/2005/2632.
Testo completoVenu, Lingampally. "Stereochemical And Synthetic Investigations". Thesis, 2013. http://etd.iisc.ernet.in/handle/2005/2632.
Testo completoKolishetti, Nagesh. "Functional Derivatives Of MEHPPV Using The Dithiocarbamate Precursor Route". Thesis, 2006. https://etd.iisc.ac.in/handle/2005/445.
Testo completoKolishetti, Nagesh. "Functional Derivatives Of MEHPPV Using The Dithiocarbamate Precursor Route". Thesis, 2006. http://hdl.handle.net/2005/445.
Testo completoModak, Arindam. "Designing The Functional Building Blocks For Syntheses Of Organic And Organic-Inorganic Hybrid Porous Materials". Thesis, 2019. http://hdl.handle.net/10821/8309.
Testo completoThe research was carried out under the supervision of Prof. Asim Bhaumik of the Materials Science division under SMS [School of Materials Sciences]
The research was conducted under CSIR fellowship and research grant
Mukherjee, Sanjoy. "Investigations of Structure-Property Relationships in NPI and BODIPY Based Luminescent Material". Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3933.
Testo completoMukherjee, Sanjoy. "Investigations of Structure-Property Relationships in NPI and BODIPY Based Luminescent Material". Thesis, 2015. http://etd.iisc.ernet.in/2005/3933.
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