Relevant bibliographies by topics / Polyaromatic molecules

Academic literature on the topic 'Polyaromatic molecules'

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Published: 11 March 2023

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Journal articles on the topic "Polyaromatic molecules"

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Yazaki, Kohei, Lorenzo Catti, and Michito Yoshizawa. "Polyaromatic molecular tubes: from strategic synthesis to host functions." Chemical Communications 54, no. 26 (2018): 3195–206. http://dx.doi.org/10.1039/c8cc00799c.

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This feature article describes the recent progress in the synthesis and application of short tubular molecules bearing multiple (≥3) polyaromatic rings (e.g., anthracene, pyrene, chrysene, anthanthrenylene, and HBC). These polyaromatic tubes display characteristic properties such as strong fluorescent emission, a selective molecular binding ability, efficient host–guest energy transfer and open–closed structural transformations.
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He, Lanyan, Pingmei Wang, Lipeng He, Zhou Qu, Jianhui Luo, Baoliang Peng, Xianqiong Tang, and Yong Pei. "Molecular dynamics simulations of the self-organization of side-chain decorated polyaromatic conjugation molecules: phase separated lamellar and columnar structures and dispersion behaviors in toluene solvent." RSC Advances 8, no. 20 (2018): 11134–44. http://dx.doi.org/10.1039/c7ra13101a.

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Kartel, M. T., V. V. Lobanov, E. M. Demyanenko, Wang Bo, A. G. Grebenyuk, and O. S. Karpenko. "Sorption of molecular hydrogen on the graphene-like matrix doped by N- and B-atoms." Himia, Fizika ta Tehnologia Poverhni 12, no. 2 (June 30, 2021): 112–23. http://dx.doi.org/10.15407/hftp12.02.112.

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The regularities of interaction of hydrogen molecules with graphene-like planes, where two carbon atoms are replaced by nitrogen or boron atoms, have been studied by the methods of quantum chemistry (DFT, B3LYP, 6-31G**). To take into account the dispersion contributions to the energy of formation of intermolecular complexes that occur during the formation of adsorption supramolecular structures, Grimme’ dispersion correction is used - D3. To study the effect of the size of a graphene-like cluster on the energy of molecular hydrogen chemisorption, polyaromatic molecules (PAM) are used of pyrene, coronene and that consisting of 54 carbon atoms, as well as their nitrogen- and boron-containing analogues where N- and B-atoms are placed in a para-position relative to each other, in the so-called piperazine configuration. The insertion of a heteroatom changes the structure of the transition state and the mechanism of chemisorption. An analysis of the results of quantum chemical calculations showed the highest exothermic dissociative adsorption of the H2 molecule on B-containing graphene-like ones. For N-containing PAM, the exothermicity of the mentioned reaction is somewhat lower, for it a possibility of desorption of atomic hydrogen desorption the surface of the latter with subsequent recombination in the gas phase has been also shown. At the same time, for models of pure graphene-like layer, the data obtained indicate the impossibility of chemisorption of molecular hydrogen. Without a complete analysis of the results for all the possible locations of the pair of hydrogen atoms (formed due to dissociation of the H2 molecule) bound by nitrogen-containing polyaromatic molecules, it can be noted that the dissociative chemisorption of the H2 molecule, regardless of the nature of heteroatom in the PAM, is thermodynamically more probable at the periphery of the model molecules than that in their centers.
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Markevich, Alexander, Simon Kurasch, Ossi Lehtinen, Oliver Reimer, Xinliang Feng, Klaus Müllen, Andrey Turchanin, Andrei N. Khlobystov, Ute Kaiser, and Elena Besley. "Electron beam controlled covalent attachment of small organic molecules to graphene." Nanoscale 8, no. 5 (2016): 2711–19. http://dx.doi.org/10.1039/c5nr07539d.

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Hagiwara, Keita, Munetaka Akita, and Michito Yoshizawa. "An aqueous molecular tube with polyaromatic frameworks capable of binding fluorescent dyes." Chemical Science 6, no. 1 (2015): 259–63. http://dx.doi.org/10.1039/c4sc02377c.

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Thomas, Michael, Irene Suarez-Martinez, Li-Juan Yu, Amir Karton, Graham S. Chandler, Marc Robinson, Isabelle Cherchneff, Dahbia Talbi, and Dino Spagnoli. "Atomistic simulations of the aggregation of small aromatic molecules in homogenous and heterogenous mixtures." Physical Chemistry Chemical Physics 22, no. 37 (2020): 21005–14. http://dx.doi.org/10.1039/d0cp02622k.

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Rumi, Mariacristina, Giuseppe Zerbi, Klaus Müllen, G. Müller, and Matthias Rehahn. "Nonlinear optical and vibrational properties of conjugated polyaromatic molecules." Journal of Chemical Physics 106, no. 1 (January 1997): 24–34. http://dx.doi.org/10.1063/1.473191.

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Lee, Hwankyu, and Yong-Kul Lee. "Effects of the asphaltene structure and the tetralin/heptane solvent ratio on the size and shape of asphaltene aggregates." Physical Chemistry Chemical Physics 19, no. 21 (2017): 13931–40. http://dx.doi.org/10.1039/c7cp01579h.

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Asphaltene molecules, which consist of differently hydrogenated polyaromatic cores grafted with side alkyl chains of different sizes and grafting densities, were simulated with a solvent mixture of heptane and tetralin using coarse-grained force fields.
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Tohnai, Norimitsu, Atsushi Yamamoto, Ichiro Hisaki, and Mikiji Miyata. "Hierarchical Construction of Versatile Diamondoid Porous Organic Salts (d-POS)." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C983. http://dx.doi.org/10.1107/s2053273314090160.

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Porous materials using organic molecules have attracted much attention due to their potential application such as gas absorption and so on. However, it is still difficult to construct porous structures from only simple organic molecules. Thus, we proposed a novel hierarchical method to construct porous structures. In this method, the first step is to build up molecular assemblies. These assemblies act to sustain porous structures with larger inclusion spaces. Then, the assemblies are accumulated by intermolecular interactions between assemblies to achieve both robustness and dynamics of the porous structures. We have previously reported organic salts composed of triphenylmethylamine (TPMA) and various sulfonic acid derivatives constructed unique molecular assemblies "supramolecular clusters" through cubic hydrogen-bonding networks. Here we demonstrate that TPMA and sulfonic acids having polyaromatic moieties give a new class of porous structures consisting of diamond networks, named as diamondoid porous organic salts (d-POSs). The supramolecular clusters are hierarchically accumulated by π–π interactions between the polyaromatic moieties to yield the d-POSs through formation of the diamond networks. Large steric hindrance of the clusters prevents the diamond networks from constructing highly interpenetrated structures, giving continuous open channels. It should be noted that the interpenetration degree of the diamond networks is controlled by tuning the bulkiness of the cluster with alteration of sulfonic acids.
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Maziarz III, E. Peter, Gary A. Baker, and Troy D. Wood. "Electrospray ionization Fourier transform mass spectrometry of polycyclic aromatic hydrocarbons using silver(I)-mediated ionization." Canadian Journal of Chemistry 83, no. 11 (November 1, 2005): 1871–77. http://dx.doi.org/10.1139/v05-195.

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Here, a methodology employing doped Ag(I) salt as an in situ cationization reagent for efficient ionization of nonpolar molecules within a conventional electrospray ionization source is described. The effectiveness of Ag(I)-mediated ionization is demonstrated using ESI Fourier transform mass spectrometry for the rapid detection and identification of priority pollutant polyaromatic hydrocarbon (PAH) species. In contrast to earlier coordination ESI-MS reports employing silver salts, argentated species are not typically observed for PAH species. Instead, oxidation of the PAH occurs to produce only the [PAH]+· odd-electron molecular parent ion, simplifying spectral analysis. In addition, the method demonstrates linear quantitative performance. The Ag(I) reagent provides quantifiable PAHs (not ordinarily amenable to ESI-MS) from 64 ppb, and suggests the immediate potential for sampling and on-line monitoring of complex, real world, and otherwise intractable environmental samples. Finally, the high mass accuracy of ESI Fourier transform mass spectrometry further allows unequivocal identification of molecular formulas within PAH mixtures.Key words: electrospray ionization, nonpolar, hydrocarbons, polyaromatic, Fourier transform mass spectrometry.
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Dissertations / Theses on the topic "Polyaromatic molecules"

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Al-Muhammad, Ayham. "Synthesis of polyaromatic molecules for applications in organic electronics." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/392946/.

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The synthesis of a number of novel polyaromatic compounds are reported, starting with novel polyheterocyclic systems containing sulphur and oxygen, otherwise known as thienoacenes and furanoacenes. These were generally produced via a four-step synthetic strategy utilising palladium-catalysed cross-coupling reactions such as Sonogashira and Suzuki cross-couplings to build the precursors, which were then subjected to a base-catalysed cycloisomerisation to give the final angular systems of several fused aromatic rings. Eight thienoacenes and seven furanoacenes, all consisting of between five and eight fused rings, were synthesised, as well as a mixed system featuring a thiophene and furan ring at either end of the molecule. Use of a five-ring thienoacene as a building block allowed for extension of the aromatic framework, and a stable fifteen-ring thienoacene was synthesised in a total of nine steps. The same synthetic method was applied in producing a series of polycyclic aromatic hydrocarbons (PAHs) with phenyl and naphthyl substituents replacing thiophene and furan. Within this chapter, significant work was carried out in investigating the final cyclisation mechanism. Six highly crystalline PAHs are reported, consisting of five to eight fused benzene rings, and the addition of extra steps enabled longer polyaromatics of nine, eleven and twelve rings to be created. The final challenge was the design and synthesis of a series of polyaromatic compounds for use as molecular wires. Similar approaches were used to build systems containing terminal pyridine and nitrile substituents which can act as anchoring groups to secure the molecule to a metal surface. Nine compounds containing five to eight fused aromatic rings with a suitable anchoring group were brought through, and the development of strategies for significantly lengthening these wires gave five systems of either nine or twelve rings. Optical and electrochemical characterisation of the compounds was carried out at the University of Caen Lower Normandy, France, in collaboration with Prof. Bernhard Witulski. The results of these measurements generally gave good correlation with computationally calculated values.
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Kulisic, Niksa. "Heteroacenes as potential materials for molecular electronics." Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3609.

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2008/2009
In this thesis, different strategies for obtaining azaacenes suitable for solution-based processing techniques have been investigated and developed. The first synthetic approach involved the condensation of commercially available compounds which include the diamines 2,3-diaminobenzene, 2,3-diaminonaphtalene and 2,3-diaminophenazine and the bromoanilic acid and embelin. This synthetic route yielded a series of dihydroazaacenes with 5 and 7 fused aromatic rings. The low overall solubility of this azaacenes did not permit an extensive characterization of the compounds. A second synthetic approach was developed to investigate both C-N exchange and lateral expansion of the π-conjugation. Through this approach a tetraazaoctacene derivative was obtained and characterized. However it lacked of solubility necessary for being compatible with solution-processing techniques. A third strategy was based on the introduction of solubilizing groups on such extended tetraazaoctacene core. While the di-substitution did not render the azaoctacene soluble in neutral media, tetra-substitution yielded a derivative with enhanced solubility in neutral solvent.
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Rolland, de Denus Christine Marie. "Controlled molecular design and polymerization of polyaromatic ethers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23656.pdf.

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de, Mendoza Bonmatí Paula. "Design and synthesis of new polyaromatic scaffolds for nano-scale applications." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/9045.

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Design and Synthesis of New Polyaromatic Scaffolds for Nano-Scale Applications

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En la última década, el diseño y la síntesis de nuevos sistemas poliaromáticos han resultado de gran interés gracias a sus propiedades únicas y sus aplicaciones potenciales para la obtención de dispositivos electrónicos, y como precursores de fullerenos.
Hemos estudiado el mecanismo que procede a través de la activación del enlace C-H en la reacción intramolecular de arilación directa catalizada por paladio, para la formación de sistemas biarílicos, demostrando que la reacción procede a través de la abstracción del protón asistido por la base. Aplicando condiciones optimizadas hemos preparado la molécula C60H24 que al ser irradiada da lugar a la formación del fullereno C60, mediante la reacción de arilación directa formando seis nuevos enlaces C-C en una única etapa.
Además, en una colaboración interdisciplinar con físicos teóricos y experimentales, en el proyecto PicoInside, hemos participado en el diseño y la síntesis de moléculas poliaromáticas para su posterior aplicación como dispositivos electrónicos moleculares.
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In the last decade, the design and synthesis of new polyaromatic scaffolds have attracted a broad interest due to their exceptional properties and their potential applications in material science like molecular electronic devices and as precursors of fullerene.
Based in the intramolecular palladium-catalyzed direct arylation reaction we developed new procedures as reliable tools for the biaryl coupling through C-H activation. Insight mechanistic studies showed a proton abstraction mechanism assisted by the base rather than activation of aromatic systems towards electrophilic attack. Applying optimized reaction conditions, formation up to six C-C bonds, and in situ dehydrogenation, allows for the synthesis of C60H24, crushed fullerene in one single step that upon laser irradiation leads to C60 fullerene.
Moreover, in an interdisciplinary collaboration with theoretical and experimental physicist, PicoInside project, we have participated in the design and synthesis of Y-shaped polyaromatic molecules required for single molecule electronic devices.
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Silva, Maria João Cerqueira da. "Polyaromatic hydrocarbons in hepatic tissues of Etmopterus pusillus and Galeus melastomus : multibiomarker analysis." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22689.

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Mestrado em Biologia Molecular e Celular
Um dos maiores ecossistemas do planeta, o marinho, apresenta uma biodiversidade enorme e é uma fonte de diversos recursos naturais. Hoje em dia, este ecossistema tornou-se relevante devido ao facto de ser alvo de inúmeras pressões antropológicas. Os tubarões são um dos predadores que estão no topo das cadeias alimentares marinhas, e estão constantemente a absorver contaminantes como consequência da bioacumulação nas redes tróficas. Etmopterus pusillus e Galeus melastomus no Oceano Atlântico estão a sofrer os efeitos da bioacumulação dos hidrocarbonetos poliaromáticos (PAH´s). Por essa mesma razão, no presente estudo foram avaliados um número de biomarcadores como objetivo de estabelecer uma relação entre os níveis de PAH´s e a ocorrência de stress oxidativo em elasmobrânquios. Na pesca comercial, foram capturados 37 indivíduos de Etmopterus pusillus (23 machos e 14 fêmeas) e 15 indivíduos de Galeus melastomus (todos fêmeas) no Oceano Atlântico, nos arredores da costa de Sesimbra. O tecido hepático foi colhido e congelado a -80°C. As amostras hepáticas foram divididas em três grupos de idade: juvenis, adultos e séniores, separados de acordo com o seu peso e tamanho individual. Neste estudo, alguns PAH´s foram quantificados como, naftaleno, pireno, fenantreno e benzo[a]pireno através do método fluorimétrico. Os PAH´s foram detetados em todas as amostras de tecido hepático dos juvenis, adultos e sénior e em ambas as espécies. Visto que foram detetados níveis de PAH´s, diferentes indicadores de stress oxidativo foram quantificados: atividade da catálase (CAT), catividade da glutationa s-transferase (GST), glutationa total (TG), peroxidação lipídica (LPO), sistema transportador de eletrões (ETS), hidratos de carbono (HC) e lípidos. Nos tecidos hepáticos de Etmopterus pusillus foi observado que CAT, GST e LPO aumentam no grupo dos adultos. Contrariamente, TG , ETS e lipidos diminuem no grupo adulto quando comparados com os juvenis. Relativamente ao Galeus melastomus foi observado que GST e LPO diminuem no grupo dos adultos quando comparados com os juvenis. Como a acumulação de PAH´s nos tecidos hepáticos foi detetada e foram encontradas diferenças significativas nos níveis das defesas antioxidantes, isto pode indicar uma relação entre eles, e um eventual estado de stress oxidativo desta população de elasmobrânquios.
One of the biggest ecosystems on the planet, the marine ecosystem, represents huge diversity and is a source of many different natural resources. Today, this ecosystem has become relevant due to the fact that planet ecosystems are a target of several anthropogenic pressures. Sharks are one of the top predators in marine food chain, constantly absorbing contaminants as a consequence of bioaccumulation on trophic nets. Etmopterus pusillus and Galeus melastomus in the Atlantic Ocean are suffering the effects of polyaromatic hydrocarbons (PAH´s) bioaccumulation. For that reason, in the present report were evaluated a number of different biomarkers in order to stablish the relationship between PAH´s levels and the occurrence of oxidative stress in elasmobranchs. In commercial fishing, 37 individuals of Etmopterus pusillus (23 males and 14 females) and 15 individuals of Galeus melastomus (all females) were captured in the Atlantic Ocean, off the coast of Sesimbra. Hepathic tissue was collected and frozen at -80°C. Hepathic samples were split into three age groups: juveniles, adults and seniors, split according to the specimen’s total weight and size. In this study, several PAH´s were quantified, such as naphthalene, pyrene, phenanthrene and benzo[a]pyrene content by a fluorimetric method. PAH´s were detected in hepathic tissue samples of juveniles, adults and seniors group in both species. Since PAH´s accumulation in liver tissue were detected, different stress oxidative parameters were quantified: catalase activity (CAT), glutathione stransferase activity (GST), total glutathione (TG), lipid peroxidation (LPO), electron transport system (ETS), hydrocarbons (HC) and lipids. In hepathic tissue of Etmopterus pusillus it was observed that CAT, GST and LPO increased in adult group. Conversely, TG, ETS and lipids decreased in adult group when compared with juvenile group. Relatively to Galeus melastomus, it was observed that GST and LPO decreased in adult group when compared with juvenile group. As PAH´s accumulation in hepathic tissues were detected and significant differences in antioxidant defense levels were found, it might indicate a relationship between them, and eventually an oxidative stress state of elasmobranch´s population.
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Benigni, Paolo. "Trapped Ion Mobility Spectrometry coupled to Fourier Transform Ion Cyclotron Resonance Mass Spectrometry for the analysis of Complex Mixtures." FIU Digital Commons, 2017. https://digitalcommons.fiu.edu/etd/3547.

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Analytical Characterization of complex mixtures, such as crude oil, environmental samples, and biological mixtures, is challenging because of the large diversity of molecular components. Mass spectrometry based techniques are among the most powerful tools for the separation of molecules based on their molecular composition, and the coupling of ion mobility spectrometry has enabled the separation and structural elucidation using the tridimensional structure of the molecule. The present work expands the ability of analytical chemists by furthering the development of IMS-MS instrumentation by coupling Trapped Ion Mobility Spectrometry to Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (TIMS-FT-ICR MS). The TIMS-FT-ICR MS platform combines the high-resolution separation of TIMS, which has mobility resolving powers up to 400, and ultra-high mass resolution of FT-ICR MS, with mass resolving power over 1,000,000. This instrumentation allows the assignment of exact chemical composition for compounds in a complex mixture, as well as measurement of the collision cross-section of the molecule. Herein, the principles of the TIMS separation and its coupling to FT-ICR MS are described, as well as how the platform can be applied to targeted analysis of molecules, and untargeted characterization of complex mixtures. Molecular standards were analyzed by TIMS-MS in order to develop a computational workflow that can be utilized to elucidate molecular structure, using the measured collision cross-section of the ion. This workflow enabled identification of structural, cis/trans isomers, and chelated molecules and provides the basis for unsupervised structural elucidation of a complex mixture, and in particular for the elucidation of hydrocarbons from fossil fuels. In summary, this work presents the coupling of TIMS-FT-ICR MS and provides examples of applications as a proof of concept of the potential of this platform for solving complex analytical challenges.
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Le, Maître Johann. "Développement de la spectrométrie de masse à ultra- haute résolution associée à la spectrométrie de mobilité ionique pour la caractérisation de coupes pétrolières lourdes. structural analysis of heavy oil fractions afterr hydrodenitrogenation by high-resolution tandem mass spectrometry and ion mobility spectrometry Structural analysis of neutral nitrogen compounds refractory to the hydrodenitrogenation process of heavy oil fractions by high-resolution tandem mass spectrometry and ion mobility-mass spectrometry Chemical characterization of 15 biocrudes obtained from hydrothermal liquefaction of industrially cultivated wild micro algae Chemical characterization with different analytical techniques, a way to understand the process: Case of the paraffinic base oil production line Exploring complex mixtures by cyclic ion mobility high-resolution mass spectrometry – Application towards Petroleum. Simulation and modeling of Collision Cross Section for structural elucidation of heavy oil fraction by ion mobility-mass spectrometry: Using polyaromatic hydrocarbons compounds mixture as calibration standard Characterization of sulfoxides compounds in dimeric distribution of heavy oil fractions by positive-ion electrospray ionization FTICR mass spectrometry Structural analysis of Petroporphyrins from asphaltene by trapped ion mobility coupled with a Fourier transform ion cyclotron resonance mass spectrometer. Cyclic ion mobility spectrometry coupled to high-resolution time-of-flight mass spectrometry equipped with atmospheric solid analysis probe for the molecular characterization of combustion particulate matter. Structural study of analogues of Titan’s haze by trapped ion mobility coupled with a Fourier transform ion cyclotron mass spectrometer." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR051.

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L'évolution des réserves de pétrole implique l'utilisation en raffinerie de pétroles bruts non conventionnels, bien souvent plus lourds et donc difficiles à caractériser. Les produits pétroliers sont en effet des mélanges chimiques extrêmement complexes. La partie légère et volatile peut être analysée par chromatographie en phase gazeuse couplée à la spectrométrie de masse (GC/MS), permettant l'identification des composés par l'utilisation de mesures de masses précises et de modèles de fragmentation. Cependant ces techniques sont inadaptées à l'analyse des fractions lourdes. Dans la pratique, la caractérisation des mélanges les plus complexes implique l'utilisation de spectromètres de masse à ultra-haute résolution généralement par analyse directe sans séparation chromatographique. La technique de référence est aujourd’hui la spectrométrie de masse à transformée de Fourier par résonance cyclotronique des ions (FTICR). Grâce à une résolution supérieure à 106 et à une précision de mesure de masse inférieure à 0,1 ppm, cet instrument permet de séparer toutes les espèces présentes dans un produit pétrolier et d'attribuer à chaque valeur de m/z une composition élémentaire unique. Ceci permet d'obtenir très facilement des cartes moléculaires qui peuvent être présentées graphiquement en utilisant le diagramme de Kendrick, le diagramme de van Krevelen ou le nombre d'insaturations (DBE) en fonction du nombre de carbones. Ce travail de thèse a permis grâce à la caractérisation moléculaire de produits pétroliers (Vacuum Gas Oil, Pétroles Bruts, Matériel Interfacial, Asphaltènes et Bio-Oil…) d'aborder la complexité de leur traitement dans l’outil de raffinage. Des protocoles d'analyses des échantillons ont été développés, à l'aide de différentes sources d'ionisation à pression atmosphérique (ESI, APCI et APPI) ainsi que par désorption/ionisation laser (LDI) sur le spectromètre de masse FTICR 12T. Les informations sur le contenu isomérique des produits pétroliers ont ensuite été déterminées grâce à l'apport de la spectrométrie de mobilité ionique (IMS)
The evolution of oil reserves requires the use in refineries of unconventional crude oils, which are often heavier and therefore difficult to characterize. Petroleum products are in fact extremely complex chemical mixtures. The light and volatile part can be analysed by gas chromatography coupled with mass spectrometry (GC/MS), allowing the identification of compounds by using precise mass measurements and fragmentation models. However, these techniques are inappropriate for the analysis of heavy fractions. In practice, the characterization of the most complex mixtures involves the use of ultra-high-resolution mass spectrometers generally by direct analysis without chromatographic separation. The reference technique today is Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR). With a resolution of more than 106 and a mass measurement accuracy of less than 0.1 ppm, this instrument can separate all the species present in a petroleum product and assign a unique elemental composition to each m/z value. This makes it very easy to obtain molecular maps that can be presented graphically using the Kendrick diagram, the van Krevelen diagram or the number of unsaturations (DBE) as a function of the number of carbons. This thesis work has allowed thanks to the molecular characterization of petroleum products (Vacuum Gas Oil, Crude Oil, Interfacial Material, Asphaltenes and Bio-Oil...) addressing the complexity of their treatment in the refining tool. Protocols for sample analysis have been developed, using different sources of ionization at atmospheric pressure (ESI, APCI and APPI) as well as laser desorption/ionization (LDI) on the FTICR 12T mass spectrometer. Information on the isomeric content of petroleum products was then determined using ion mobility spectrometry (IMS)
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Book chapters on the topic "Polyaromatic molecules"

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Jacquot de Rouville, Henri-Pierre, Romain Garbage, Agnès M. Sirven, Claire Kammerer, and Gwénaël Rapenne. "Triptycene or Subphthalocyanine Wheels and Polyaromatic Hydrocarbon Nanovehicles." In Single Molecular Machines and Motors, 65–79. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13872-5_4.

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"Structure, texture, and thermal behaviour of polyaromatic solids Marc Monthioux." In Carbon Molecules and Materials, 143–94. CRC Press, 2002. http://dx.doi.org/10.1201/b16832-7.

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Sawada, Tsuyoshi, Shingo Kubo, and Kazuaki Nanamura. "Chirality and Circular Polarized Properties of Photochromic Polyaromatic Molecules." In Chirality from Molecular Electronic States. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.81880.

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Saraswat, Pooja, Kritika Yadav, Anamika Gupta, Mrinalini Prasad, and Rajiv Ranjan. "Physiological and molecular basis for remediation of polyaromatic hydrocarbons." In Handbook of Bioremediation, 535–50. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-819382-2.00034-x.

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Conference papers on the topic "Polyaromatic molecules"

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Davari, N., P. O. Astrand, and M. Unge. "Field-dependent ionization potential for polyaromatic molecules from constrained density-functional theory." In 2014 IEEE 18th International Conference on Dielectric Liquids (ICDL). IEEE, 2014. http://dx.doi.org/10.1109/icdl.2014.6893142.

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Savchenkova, A. S., A. S. Semenikhin, I. V. Chechet, S. G. Matveev, M. Frenklach, and A. M. Mebel. "DIMERIZATION OF POLYAROMATIC HYDROCARBON MOLECULES WITH FORMATION OF E-BRIDGE BOND: A THEORETICAL STUDY." In 9TH INTERNATIONAL SYMPOSIUM ON NONEQUILIBRIUM PROCESSES, PLASMA, COMBUSTION, AND ATMOSPHERIC PHENOMENA. TORUS PRESS, 2020. http://dx.doi.org/10.30826/nepcap9a-13.

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In combustion engines and other fuel-burning devices, during the combustion of hydrocarbon fuels at a temperature of 1000-1400 K, soot is actively formed, deposited on the cold surfaces of the devices, which reduces their service life. At present, much attention is paid to the problems of controlling the amount and size of soot particles formed during combustion. However, the mechanism of soot formation has not yet been fully understood. It is assumed that under combustion conditions, young soot particles are formed by nucleation of aromatic and polyaromatic hydrocarbons (PAHs) with subsequent growth of particles due to the addition of new molecules.
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Wright, John C. "Applications of Linear and Nonlinear Site Selective Spectroscopy to Chemical Measurements." In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/laca.1987.tha5.

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Selectivity is a factor that limits practical chemical measurements in many analytically important situations either because the large number of components causes overlapping of distinguishing features or the features of any one component are broadened because of inhomogeneties within the sample. Site selective spectroscopy has been developed as a method for improving selectivity by reducing both types of problems. Fluorescence line narrowing was first developed by Szabo for eliminating inhomogeneous broadening in ruby crystals [1], it was extended to the elimination of inhomogeneous broadening in the spectra of polyaromatic hydrocarbons by Marchetti and coworkers [2], and it was adapted to analytical problems by Small and coworkers [3]. In this technique, a laser is tuned to a position within an inhomogeneously broadened band so that molecules in sites that are resonant with the laser are excited. The resulting fluorescence spectrum can be markedly sharpened because only a subset of the chromophores contribute and the inhomogeneous broadening can be eliminated.
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4

Jian, Cuiying, and Tian Tang. "Nanorods self-assembled from polyaromatic compounds: A molecular dynamics study [1]." In 2015 IEEE Nanotechnology Materials and Devices Conference (NMDC). IEEE, 2015. http://dx.doi.org/10.1109/nmdc.2015.7439271.

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"Effects caused by vacancies in carbon nanocluster C96 and polyaromatic molecule C96H24." In Chemical technology and engineering. Lviv Polytechnic National University, 2021. http://dx.doi.org/10.23939/cte2021.01.044.

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Collis, Gavin E. "Designing small molecule polyaromatic p- and n-type semiconductor materials for organic electronics." In SPIE Micro+Nano Materials, Devices, and Applications, edited by Benjamin J. Eggleton and Stefano Palomba. SPIE, 2015. http://dx.doi.org/10.1117/12.2202565.

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Sharma, Vaishali, Shweta D. Dabhi, Satyam Shinde, and Prafulla K. Jha. "Tuning electronic properties of graphene nanoflake polyaromatic hydrocarbon through molecular charge-transfer interactions." In INTERNATIONAL CONFERENCE ON NANOMATERIALS FOR ENERGY CONVERSION AND STORAGE APPLICATIONS: NECSA 2018. Author(s), 2018. http://dx.doi.org/10.1063/1.5035233.

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Misono, Masatoshi, Masaaki Baba, Shunji Kasahara, and Sho Yamasaki. "HIGH-RESOLUTION SPECTROSCOPY OF POLYAROMATIC HYDROCARBONS WITH A SINGLE MODE TI:SAPPHIRE LASER DISCIPLINED BY AN OPTICAL FREQUENCY COMB." In 74th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2019. http://dx.doi.org/10.15278/isms.2019.mj04.

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Chen, Shaohua, Ming Han, Abdulkareem AlSofi, and Tianping Huang. "A Novel Chemical Formulation for Heavy Oil Viscosity Reduction and Heavy Oil Displacement." In Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213402-ms.

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Abstract A novel water-soluble viscosity reducer (VR) formulation containing various polyaromatic hydrocarbon structures was designed for effective heavy oil viscosity reduction and heavy oil production by oil displacement. This VR package contains several components, including aromatic groups attached short-chain water-soluble polymers which were synthesized in laboratory, small-molecular aromatic chemicals, non-ionic and cationic surfactants, and rheology modifiers. The designed VR formulation was compatible with the high-salinity water (HSW) using appropriate preparation procedures. The VR solution in HSW yielded a stable emulsion after mixing with heavy oil and the emulsion phase separated subsequently, indicating a good performance in demulsification. The formulation decreased the viscosity of heavy crude oil by 84.2% at a temperature of 50 °C, a VR concentration of 0.2 wt%, and an oil-to-water ratio of 7:3. Micromodel test indicated that the residual oil blocks were effectively replaced by the VR flooding due to the strong emulsification and increased sweep efficiency by heavy oil viscosity reduction. The injection pressure decreased by the VR flooding due to a reduced viscosity of the heavy oil. The initial water injection increased the heavy oil production by 15% only, while the following VR flooding further enhanced the heavy oil production by 26% and the post water injection exhibited a limited effect on enhanced oil production by 4%, as obtained from the core-flooding test using a heavy oil saturated carbonate core.
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