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Relevant bibliographies by topics / Carbene precursor

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Academic literature on the topic 'Carbene precursor'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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Journal articles on the topic "Carbene precursor"

1

Chowdhury, Rajdip, and Abraham Mendoza. "N-Hydroxyphthalimidyl diazoacetate (NHPI-DA): a modular methylene linchpin for the C–H alkylation of indoles." Chemical Communications 57, no. 37 (2021): 4532–35. http://dx.doi.org/10.1039/d1cc01026c.

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The insertion of conventional diazocompounds into indoles are still limited by the custom carbene precursors, catalysts and manipulation of the products required. Herein, we address these shortcomings with a redox-active carbene precursor (NHPI-DA).

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2

Blanch, Rodney J., and Curt Wentrup. "Trifluoromethylphenylcarbenes. Carbene-Carbene Interconversion on the Singlet Energy Surface and Rearrangement to Trifluorobenzocyclobutene, Trifluorostyrene, and Trifluoromethylfulvenallenes." Australian Journal of Chemistry 68, no. 1 (2015): 36. http://dx.doi.org/10.1071/ch14097.

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The four isomeric α-, ortho-, meta-, and para-trifluoromethylphenylcarbenes were generated by photolysis of the corresponding 3-phenyl-3-trifluoromethyldiazirene 1 or the four isomeric trifluoromethylphenyldiazomethanes 2 and 4–6. The four corresponding triplet trifluoromethylphenylcarbenes 3 and 7–9 were observed by electron spin resonance (ESR) spectroscopy in Ar matrices at 14 K. The α- and ortho-carbenes 3 and 7 and the ortho- and para-carbenes 7 and 9 interconvert partially when generated by short-wavelength photolysis (350 nm) before intersystem crossing to the triplet states. The triplet states do not undergo further Carbene-Carbene interconversion. The interconversions are assumed to take place via the meta-trifluoromethylphenylcarbene 8. When the ortho- and para-carbenes are generated by long-wavelength photolysis (>450 nm), the discrete, non-interconverting triplet carbenes are observed in the ESR spectra. Flash vacuum thermolysis of the diazirene 1 at 500°C afforded a mixture of bis(trifluoromethyl)heptafulvalenes 11, bis(trifluoromethyl)stilbenes 12, and bis(trifluoromethyl)anthracenes 13, and the presence of their likely precursor(s), trifluoromethylcycloheptatetraene(s), was confirmed by a peak at 1830 cm–1 in the Ar matrix IR spectrum. In addition, at 700°C, four monomeric carbene rearrangement products were isolated and characterised, viz. 1,1,2-trifluorobenzocyclobutene 14, 1′,2′,2′-trifluorostyrene 15, and 1- and 2-trifluoromethylfulvenallenes 16 and 17.

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3

Hudnall, Todd W., Eric W. Reinheimer, and Christopher L. Dorsey. "Synthesis, crystal structure determination, and spectroscopic analyses of 1-chloro-2-(2,6-diisopropylphenyl)-4,4-dimethyl-2-azaspiro[5.5]undecane-3,5-dione: an unyielding precursor to a cyclic (alkyl)(amido)carbene." Acta Crystallographica Section C Structural Chemistry 77, no. 7 (June 25, 2021): 411–19. http://dx.doi.org/10.1107/s2053229621006173.

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The synthesis, single-crystal X-ray structure, and 1H and 13C NMR spectrocopic analyses of an unyielding precursor molecule to a cyclic (alkyl)(amido)carbene, 1-chloro-2-(2,6-diisopropylphenyl)-4,4-dimethyl-2-azaspiro[5.5]undecane-3,5-dione, C24H34ClNO2 (1), is reported. Despite the use of several bases, 1 could not be deprotonated to afford the corresponding carbene. The crystal structure of 1 was compared to the crystal structures of two structurally similar HCl adducts of stable carbenes (compounds 4 and 5), which revealed no significant differences in the geometries about the `carbene' C atoms. To better understand the reactivity differences observed for 1 when compared to 4 and 5, modified percent buried volume (%V bur) calculations were performed. These calculations revealed that the H atom bound to the carbene C atom is the most sterically hindered in compound 1 when compared to 4 and 5 (%V bur = 84.9, 81.3, and 79.3% for 1, 4, and 5, respectively). Finally, close inspection of the quadrant-specific %V bur values indicated that the approach of a deprotonating base to the H atom bound to the carbene C atom is significantly blocked in 1 (69.9%) when compared to 4 and 5 (50.4 and 56.5%, respectively).

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4

Ren, Li, Austin C. Chen, Andreas Decken, and Cathleen M. Crudden. "Chiral bidentate N-heterocyclic carbene complexes of Rh and Pd." Canadian Journal of Chemistry 82, no. 12 (December 1, 2004): 1781–87. http://dx.doi.org/10.1139/v04-165.

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The synthesis of a new chiral, bidentate oxazoline/imidazolidene carbene precursor is described. This species is reacted with various metal salts in the presence of a base to generate rhodium and palladium complexes, which are characterized spectroscopically and crystallographically.Key words: chiral N-heterocyclic carbene, rhodium, palladium, oxazolidine, asymmetric catalysis.

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5

Holm, Stefanie C., Frank Rominger, and Bernd F. Straub. "Thiol-functionalized 1,2,4-triazolium salt as carbene ligand precursor." Journal of Organometallic Chemistry 719 (November 2012): 54–63. http://dx.doi.org/10.1016/j.jorganchem.2012.08.018.

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6

Jenks, William S., Melanie J. Heying, and Erin M. Rockafellow. "Modulation of Carbene Spin State Population through Precursor Photophysics." Organic Letters 11, no. 4 (February 19, 2009): 955–58. http://dx.doi.org/10.1021/ol802934w.

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7

Gilliom, Laura R., and Robert H. Grubbs. "A titanacyclobutane precursor to alkyl-substituted titanium carbene complexes." Organometallics 5, no. 4 (April 1986): 721–24. http://dx.doi.org/10.1021/om00135a016.

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8

Duan, Wenzeng, Yudao Ma, Yanmin Huo, and Qingxia Yao. "Crystal Structure Studies towards the Synthesis and Applications of N-heterocyclic Carbene–Metal Complexes Derived from [2.2]Paracyclophane." Australian Journal of Chemistry 68, no. 10 (2015): 1472. http://dx.doi.org/10.1071/ch15002.

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The crystal structures of six planar chiral N-heterocyclic carbene (NHC) precursors and one NHC–Rh complex derived from [2.2]paracyclophane were described. The NHC–metal complexes were prepared to examine their catalytic activities toward the Rh-catalyzed asymmetric addition of phenylboronic acid to 1-naphthaldehyde. The results were correlated to the single-crystal crystallographic studies. The novel NHC precursor 5 can achieve high catalytic activity in the asymmetric addition of phenylboronic acid to 1-naphthaldehyde.

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9

Tang, Z., S. Mandal, N. D. Paul, M. Lutz, P. Li, J. I. van der Vlugt, and B. de Bruin. "Rhodium catalysed conversion of carbenes into ketenes and ketene imines using PNN pincer complexes." Organic Chemistry Frontiers 2, no. 12 (2015): 1561–77. http://dx.doi.org/10.1039/c5qo00287g.

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10

Glessi, Cristiano, Aya Mahgoub, Cornelis W. Hagen, and Mats Tilset. "Gold(I) N-heterocyclic carbene precursors for focused electron beam-induced deposition." Beilstein Journal of Nanotechnology 12 (March 17, 2021): 257–69. http://dx.doi.org/10.3762/bjnano.12.21.

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Seven gold(I) N-heterocyclic carbene (NHC) complexes were synthesized, characterized, and identified as suitable precursors for focused electron beam-induced deposition (FEBID). Several variations on the core Au(NHC)X moiety were introduced, that is, variations of the NHC ring (imidazole or triazole), of the alkyl N-substituents (Me, Et, or iPr), and of the ancillary ligand X (Cl, Br, I, or CF3). The seven complexes were tested as FEBID precursors in an on-substrate custom setup. The effect of the substitutions on deposit composition and growth rate indicates that the most suitable organic ligand for the gold precursor is triazole-based, with the best deposit composition of 15 atom % gold, while the most suitable anionic ligand is the trifluoromethyl group, leading to a growth rate of 1 × 10−2 nm3/e−.

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Dissertations / Theses on the topic "Carbene precursor"

1

Awenat, Karim. "Development of a method for the functionalisation of polymer substrates." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365836.

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2

Jančík, Vojtěch. "Synthesis, structural studies and reactivity of monomeric organo aluminum and gallium amides, hydrogensulfides and hydroxides using N-heterocyclic carbene precursor for heterobimetallic systems /." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974004693.

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Singh, Sanjay. "Monomeric organo-aluminum and gallium monohydroxides as precursor for homo- and heterobimetallic oxides synthetic, reactivity and structural investigations including gold(I) N-heterocyclic carbene complexes /." [S.l.] : [s.n.], 2006. http://webdoc.sub.gwdg.de/diss/2006/singh.

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4

Penugonda, Madhusudhan R. "Alumina - silicon carbide composites from kaolinite-carbon precursors by hot-pressing." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/28509.

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The system kaolinite - carbon black consisting of cheap precursors has been investigated, in terms of its potential to form A1₂ O₃ - SiC composites. The carbothermal reduction process of mullite and silica was studied, in detail, in the range 1275° to 1810° C and over different periods, both under sintering as well as hot-pressing conditions. It was established that the reduction of mullite and silica starts around 1450° C, where the rate of reaction is very slow. Until about 1800° C during the reduction of mullite, SiO₂ gets preferentially reduced, thus forming a composite ceramic consisting of SiC and A1₂ O₃ phases. The kinetics of the formation of SiC + A1₂ O₃ were followed in the range 1590° - 1660° C and it was noted that under hot-pressing conditions they follow a contracting cylinder model. The rate of reaction increased with the increase in temperature and followed a parabolic path with time because of the geometry of the hot-pressed specimens at each temperature. This indicated that the gas diffusion in and out of the system along the edges of the cylindrical specimens is the rate controlling step. The activation energy of the reduction process was calculated to be 922 KJ/mole. The application of pressure prior to the carbothermal reduction process seemed to be not favourable for the formation of SiC and A1₂ O₃, however, when applied after the beginning of soaking period, this greatly improved the densities and formation of SiC and A1₂ O₃. The microstructure of the samples was analysed using SEM and TEM. It was found that the grain size of the composite ceramic was of the order of 0.2μm. SiC was present mainly in the form of fine platelets. Finally, the isothermal compaction behaviour of the system was studied under a constant pressure in the temperature range 1200° C - 1800° C, during which the formation and carbothermal reduction of mullite and silica took place. A mathematical model based on the least squares fitting was used to fit the compaction curves. Due to the complex nature of the compaction data an empirical approach was used to interpret the data and a viscoelastic model was developed. It was found that the interactive-double-Kelvin unit having two elastic and two viscous components explained the type of compaction behaviour observed in the kaolinite + C system. One of the viscous components (η₁) and one of the elastic components (M₁) were found to be temperature sensitive. It is concluded that starting from the cheap precursors (kaolinite and carbon black) a particulate composite of A1₂ O₃,-SiC can be produced by hot-pressing technique. SiC-whisker formation is not encountered in this system. The very fine grain size of the paniculate composite, resulting in a small flaw size, should provide the composite ceramic with good mechanical properties.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate

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5

Cassara, Christopher M. "Synthesis an photochemistry of new carbene precursors." Connect to this title online, 2005. http://hdl.handle.net/1811/337.

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Thesis (Honors)--Ohio State University, 2005.
Title from first page of PDF file. Document formattted into pages: contains x, 54 p.; also includes graphics. Includes bibliographical references (p. 54). Available online via Ohio State University's Knowledge Bank.

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6

Tabassum, Sobia. "New Chiral Carbene Precursors for Catalysis and Chiral Recognition." Clausthal-Zellerfeld Universitätsbibliothek Clausthal, 2010. http://d-nb.info/1001909348/34.

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7

Acauan, Luiz Henrique. "Síntese e avaliação de florestas de nanotubo de carbono utilizando hexano como precursor." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/34683.

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Esta dissertação de mestrado investigou a técnica de síntese de “florestas” de nanotubos de carbono (NTC) produzidos por deposição química de vapor catalisada sobre substratos planos (wafers) de silício monocristalino utilizando filmes finos de ferro como catalisador e hexano como precursor de carbono. Os parâmetros de síntese analisados foram: temperatura, espessura de filme catalisador e quantidade de hexano. A caracterização dos nanotubos foi feita por Espectroscopia Raman, Microscopia Eletrônica de Varredura e Transmissão. As florestas apresentaram uma grande dependência das nanopartículas formadas durante o aquecimento das amostras. Estas por sua vez dependem diretamente da temperatura e espessura do filme catalisador. A melhor dispersão de nanopartículas foi alcançada com a maior espessura analisada (3,7nm) e temperatura intermediaria (800ºC) A temperatura também controla a qualidade dos NTC’s formados e influencia na taxa de precursor convertido em carbono. O aumento desta produz NTC’s de menor diâmetro, mas maior quantidade de carbono amorfo. Já a quantidade de hexano depende apenas do carbono absorvido pelas florestas, sendo o ponto ótimo igual ao mínimo necessário pra formação destas. O uso de hexano possibilitou a produção de florestas formadas por nanotubos de parede múltipla (MWNTs) com um bom alinhamento e de qualidade superior quando comparados à MWNTs comerciais. NTC’s com parede simples também puderam ser produzidos, mas não sob a forma de florestas, pois na temperatura necessária para produzir-los há um grande acumulo de carbono amorfo.
This study has investigated the method for “forest-like” carbon nanotube (CNT) production synthesized by catalytical chemical vapour deposition over flat substrates as silicon wafers, with a thin layer of iron as catalyst and hexane as carbon source. The following parameters were evaluated: temperature, the thickness of the catalyst layer and quantity of carbon source (hexane) The carbon nanotube characterization was performed by Raman spectroscopy, Scanning and Transmission Electron Microscopy The CNT forests shown a big correlation with the nanoparticles formed at the heating stage. Their syntheses depend on the temperature and catalyst thickness as well. The best nanoparticles dispersion was reach with the thickest iron layer used (3,7nm) at intermediary temperatures (800ºC). The temperature also controls the quality of the synthesized CNT and plays an important roll in precursor conversion into carbon. As we increase the temperature, the CNT’s diameter gets thinner but the amount of amorphous carbon goes up. In the other hand, the concentration of hexane only affects the forest carbon consumption, with an optimal value equal to minimum quantity necessary for its formation. The hexane was able to synthesizes a forest-like multiwalls CNT’s (MWNT’s) with a good alignment and higher quality when compared with the commercial ones. Singlewalls CNT’s were also produced but they have no forest-like shape, once that at the higher temperatures required to produce them, a huge amount of amorphous carbon also appears.

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8

Föllmer, Marie. "Lignin fibres prepared by coagulation : a promising precursor for carbon fibres." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0238/document.

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Les fibres de carbone sont actuellement utilisées dans les matériaux composites pour les secteurs de l'aérospatiale, l’aéronautique et les sports de compétition. Leur application sur les marchés de grande consommation est toutefois entravée par le coût élevé des matières premières et le procédé de carbonisation, notamment l’étape de stabilisation. Par conséquent,les matériaux précurseurs alternatifs et peu coûteux sont très demandés. La lignine, une ressource naturelle très abondante contenant de grandes quantités de carbone, est considérée comme un bon candidat. Jusqu'à présent, les fibres de lignine ont été principalement préparées par filage en voie fondue et en mélange avec des polymères thermoplastiques pour améliorer leur aptitude au filage et leurs propriétés mécaniques, mais en réduisant fortement leurs rendements de carbonisation et en augmentant leur prix. Nous proposons dans cette thèse des fibres précurseur à base de lignine obtenues par un procédé de filage en continu par coagulation. En combinaison avec de petites proportions d'alcool polyvinylique, on obtient des fibres composites hautement flexibles et infusibles, contenant jusqu'à 70-90 % de lignine industrielle. Notre développement nous permet de fabriquer des fibres de carbone avec des rendements de l’ordre de 30 % qui présentent des propriétés prometteuses. Jusqu'à présent, les fibres de carbone à base de lignine mentionnées dans la littérature n'atteignent pas les propriétés mécaniques requises pour des applications à hautes performances en raison de leur structure de carbone amorphe. Cependant, en incorporant des cristaux liquides de feuillets d'oxyde de graphène ou des nanocristaux de cellulose dans nos fibres précurseurs de lignine, nous pouvons améliorer l'orientation des plans de carbone obtenus après la carbonisation. Nos systèmes de fibres à base de lignine avec une structuration améliorée représentent donc une étape importante vers la mise en oeuvre industrielle de la lignine en tant que matériau précurseur «vert» pour les fibres de carbone à faible coût et à haute résistance
Carbon fibres are currently used in composite materials for the aerospace, transportation and energy sectors. Their application in mass markets however is hindered by the high cost of the fibre raw materials. Therefore, alternative and inexpensive precursor materials are in high demand. Especially lignin, a widely abundant natural resource containing high quantities of carbon, is considered as an important candidate. So far, lignin fibres have mostly been prepared by melt-spinning and by blending with thermoplastic polymers to enhance their spinnability and mechanical properties, but strongly lowering their carbonization yields and raising their price. We propose lignin-based precursor fibres obtained through a continuous wet-spinning process. In combination with only small ratios of polyvinyl alcohol, highly flexible and infusible composite fibres, containing up to 70-90 % of industrial lignin, can be obtained.Our development enables us to manufacture carbon fibres in high yields which exhibit promising properties. Until now, lignin-based carbon fibres reported in literature do not reach the mechanical properties required for high-performance applications due to their amorphous carbon structure. However, by incorporation of liquid crystalline graphene oxide flakes or cellulose nanocrystals into our lignin precursor fibres, we are able to improve the orientation of the carbon planes obtained after carbonization. Our lignin-based fibre systems with enhanced structuration thus represent an important step towards the industrial implementation of lignin as “green” precursor material for low-cost and high-strength carbon fibres

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9

Matzinos, Panagiotis D. "Coal-tar pitch as the matrix carbon precursor in carbon-carbon composites." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/28083.

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Coal-tar pitch is a promising carbon matrix precursor for carbon-carbon composites. It has a suitable viscosity, high carbon yield, and it forms graphitic structures. In addition, pitch is a relatively cheap raw material. This thesis is a study on the use of coal-tar pitch as carbon matrix precursor in carbon–carbon composites.

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10

Geraghty, Paul Bythell. "Studies towards the synthesis of fused N-Heterocyclic carbene precursors." Thesis, University of Canterbury. Chemistry, 2013. http://hdl.handle.net/10092/8197.

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This thesis describes the preparation of a various NHC ligands with five and six-membered rings, different fused aromatic cores and the subsequent synthetic development of their complexation of with Ag, Ru and Pd. The investigation and preparation of these compunds was with the intention of exploring their chemical and physical properties. The synthesis of the NHC ligands proved to be difficult, but analysis and characterisation of the side products from the reactions helped to establish successful synthetic methodologies. In both the five and six-membered research conducted a common attribute was established of a pyrid-2-yl substituent at the 1 position or both the 1 and 3 positions, thus providing new NHC ligands to investigate. The organic syntheis of the research focused on two NHC ligand functionalites, five and six membered rings. The six memerbered rings focused on 1H-perimidine as the core unit and the design of both bidentate and tridentate NHC ligands to mimic the structural binding relationship of 2,2’- bipyridine (bpy) and 2,2’:6’2”-terpyridine (tpy) with various metal salts. The synthesis of the bpy analogues was achieved in good overall yields with minimal synthetic challenges. However, the tpy analogue was unable to be realised due to time constraints and problems associated with its synthesis. The five membered NHC ligands synthesised were to investigate the physical effects of systematically increasing the size of its aromatic core. The main focus of the research was on the phenanthrene imidazole NHC ligands. This was investigated due to the minimal research that has been conducted on this core unit and NHC-complexes. Synthesis of the two-bidentate NHC ligands with an imidazole head group and fused phenanthrene backbone were completed, but this was with a picolyl substituent at the 1 position rather than the pyrid-2-yl substituent. This failure to isolate this product was attributed to steric influences. Pyrene-fused-imidazole NHC ligands were also investigated and pyrene offers a NHC core that hasn’t been investigated previously. However, synthesis and isolation of the NHC ligands proved to be difficult and was associated with the poor solubility of the NHC ligands. The organometallic NHC synthesis was studied extensively with the main focus on establishing appropriate conditions to give a NHC complex. The main metal investigated was ruthenium as subsequent NHC complexes were expected to have potentially interesting properties such as luminescence. The synthesis of a perimidine and phenanthrene NHC ruthenium complexes have not been isolated before, thus giving new NHC complexes. Many different synthetic routes were attempted to synthesise a perimidine NHC ruthenium complex. However, this proved difficult due to associated higher reactivity of the carbene carbon of perimidine with a new side product as a result of this research. The phenanthrene NHC complex synthesis suffered due to time constraints but potential methodology for their synthesis is stated.

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Books on the topic "Carbene precursor"

1

Brauer, Samuel. Advanced structural fibers from precursors: Carbon, silicon carbide. Norwalk, CT: Business Communications Co., 1997.

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Naskar, Amit K., and Wesley P. Hoffman, eds. Polymer Precursor-Derived Carbon. Washington, DC: American Chemical Society, 2014. http://dx.doi.org/10.1021/bk-2014-1173.

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White, Robin J., ed. Porous Carbon Materials from Sustainable Precursors. Cambridge: Royal Society of Chemistry, 2015. http://dx.doi.org/10.1039/9781782622277.

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Gardner, LuAnn. Procedures for the preparation of emission inventories for carbon monoxide and precursors of ozone. Research Triangle Park, NC: Office of Air Quality Planning and Standards, Office of Air and Reduction, U.S. Environmental Protection Agency, 1992.

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Gardner, LuAnne. Procedures for the preparation of emission inventories for carbon monoxide and precursors of ozone. Research Triangle Park, NC: Office of Air Quality Planning and Standards, Office of Air and Reduction, U.S. Environmental Protection Agency, 1992.

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Gardner, LuAnn. Procedures for the preparation of emission inventories for carbon monoxide and precursors of ozone. Research Triangle Park, NC: Office of Air Quality Planning and Standards, Office of Air and Reduction, U.S. Environmental Protection Agency, 1992.

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Gardner, LuAnn. Procedures for the preparation of emission inventories for carbon monoxide and precursors of ozone. Research Triangle Park, NC: Office of Air Quality Planning and Standards, Office of Air and Reduction, U.S. Environmental Protection Agency, 1992.

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Speiran, Gary K. Dissolved organic carbon and disinfection by-product precursors in waters of the Chickahominy River basin, Virginia, and implications for public supply. Richmond, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2000.

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Speiran, Gary K. Dissolved organic carbon and disinfection by-product precursors in waters of the Chickahominy River basin, Virginia, and implications for public supply. Richmond, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2000.

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Polymer Precursor-Derived Carbon. American Chemical Society, 2015.

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Book chapters on the topic "Carbene precursor"

1

Savage, G. "Thermoplastic Matrix Precursors." In Carbon-Carbon Composites, 157–91. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1586-5_5.

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Savage, G. "Thermosetting Resin Matrix Precursors." In Carbon-Carbon Composites, 117–56. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1586-5_4.

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El Ashry, E. S. H., Y. El Kilany, and N. M. Nahas. "Manipulation of Carbohydrate Carbon Atoms for the Synthesis of Heterocycles." In Heterocycles from Carbohydrate Precursors, 1–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/7081_2006_047.

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Park, Soo-Jin, and Gun-Young Heo. "Precursors and Manufacturing of Carbon Fibers." In Carbon Fibers, 31–66. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9478-7_2.

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Park, Soo-Jin. "Precursors and Manufacturing of Carbon Fibers." In Carbon Fibers, 31–67. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0538-2_2.

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Interrante, L. V., C. W. Whitmarsh, W. Sherwood, H. J. Wu, R. Lewis, and G. Maciel. "Hydridopolycarbosilane Precursors to Silicon Carbide." In Applications of Organometallic Chemistry in the Preparation and Processing of Advanced Materials, 173–83. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0337-4_10.

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Prenzel, Dominik, and Rik R. Tykwinski. "Carbon-Rich Materials from sp-Carbon Precursors." In Synthetic Methods for Conjugated Polymers and Carbon Materials, 255–91. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527695959.ch8.

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Corriu, Robert J. P., Markus Enders, Sylvain Huille, Laurence Lutsen, and Joël J. E. Moreau. "Ceramics from Molecular Precursors Transition Metal Activation of Silicon-Carbide Precursors." In Applications of Organometallic Chemistry in the Preparation and Processing of Advanced Materials, 185–99. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0337-4_11.

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Kuznetsov, N. T. "Precursors for Carbide, Nitride and Boride Synthesis." In Materials Science of Carbides, Nitrides and Borides, 223–45. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4562-6_13.

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Chernyshev, Evgenii A., Svetlana A. Bashkirova, Igor I. Raisin, Tatyana V. Tikhonovich, and Lubov V. Ul’yanova. "Polyorganosilanes - Perspective Precursors for Silicon Carbide Composites." In MICC 90, 194–98. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3676-1_23.

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Conference papers on the topic "Carbene precursor"

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Myers, Oliver J., and Sourav Banerjee. "Coupled Damage Precursor Detection." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-8950.

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This conceptual research focuses on identifying damage precursors in carbon fiber reinforced polymer laminates. By coupling integrated in situ sensing elements (magnetostrictive particles) and multi-scale ultrasonic inspection (Quantitative Ultrasonic Imaging) with minimum hardware the authors are able to capture and gain an understanding of damage precursors. Preliminary damage precursors can be identified and quantified and correlated to a particular failure mode(s) and/or fabrication process accelerating the need for a sensing/repair strategy that could be implemented to capture the specific precursor prior to the onset of cracks. Capturing and mitigating damage precursors ahead of micro-crack formulation will slow the evolution of the damage precursors to micro-cracks, mitigate adverse loading environment, and develop techniques to reduce stress and loading below the endurance limit to keep it from being fatigued.

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Banerjee, Soumik. "Molecular Simulation of the Self-Agglomeration of Carbon Nanostructures in Various Chemical Environments." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89697.

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Self-assembly of carbon nanostructures in solutions provides a cost-effective means to synthesize uniform vertically-aligned nanostructures with specific morphologies including shapes such as wires, sheets and spherical particles. In addition to facilitating the synthesis of bulk carbon nanomaterial, a complete understanding of the agglomeration mechanics also provides a means to deposit uniform layers of carbon nanostructures on top of substrates to produce molecularly-tailored composites with specific mechanical properties. Self-assembly is a complex dynamical process that involves the interaction between the nanoparticle precursors, the transport properties of the individual precursor molecules as well as the precursor-solvent interactions. Depending on the chemical nature of the solvent used during the process various nanostructures of varying shapes and morphologies can be synthesized starting from individual buckyballs and nanotubes. However, despite its wide range of applications, there is a lack of understanding of the self-assembly of carbon nanoparticles. Some of the key factors that govern the agglomeration process are the π-π interaction of the aromatic carbon nanostructures and their interaction with the solvent molecules. A predictive model for self-assembly, that relates the above parameters to the morphology, therefore needs to account for the specific molecular interactions. We present molecular simulation results that incorporate the above effects and shows that the nature of association of the nanoparticle precursors determines the shape and size of the agglomerate. Furthermore, our results show the dependency of the agglomerate size on the concentration of precursors as well as the ambient temperature.

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Garg, R. K., J. P. Gore, and T. S. Fisher. "Numerical Simulation of Gas Phase Growth Environment of Carbon Nanotube Synthesis by Plasma-Enhanced Chemical Vapor Deposition." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81953.

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The gas-phase growth environment of carbon nanotubes has been simulated using different published chemical reaction mechanisms for a gas mixture of methane and hydrogen. Detailed chemical analysis of the growth environment is important in identifying precursor species responsible for CNT formation and is useful in understanding fundamental mechanisms that ultimately could allow control of the CNT synthesis process. The present simulations seek to compare the roles of different gas phase reaction mechanisms and to identify precursors for CNT formation. The results show that inlet methane-hydrogen mixture converts primarily to a acetylene-hydrogen mixture, and C2H2, CH3, H2, and H are the main precursors formed in the plasma under experimentally verified CNT growth conditions in a microwave plasma reactor.

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Bharadwaj, Lavanya, Abhijeet Dhamne, Linan An, Barry Fookes, Jay Kapat, and Louis Chow. "Polymer-Derived Si-Al-C-N-O Ceramics for High Temperature Applications." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38561.

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Polymer-derived ceramics are a new class of materials synthesized by thermal decomposition of polymeric precursors. The resultant materials are amorphous alloys of silicon, carbon, and nitrogen, which can be converted to crystalline materials by annealing at higher temperatures. This novel chemical-to-ceramic route offers a unique opportunity to tailor the structures and compositions, therefore the properties, of the resultant materials by designing the chemistry of the precursors. In this paper we report the studies on synthesis and oxidation behavior of polymer-derived SiAlCN materials. The precursor was synthesized by mixing a polysilazane and aluminum isopropoxide. The mixture was then pyrolyzed at 1000°C in Ar/N2 to convert to SiAlCNO ceramics. The oxidation studies revealed that the SiAlCNO possesses a lower oxidation rate than SiCN. It is believed that the better oxidation resistance exhibited by SiAlCN is due to the oxide layer containing Al, which makes oxygen diffusion more difficult than in pure SiO2. The materials are promising for many high temperature applications, e.g. environmental barrier coatings, high temperature fibers, matrixes for composites, and even monolithic components.

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Wang, Siqi, Liangzhong Xiang, Yingtao Liu, and Hong Liu. "Photo-Acoustic Based Non-Contact and Non-Destructive Evaluation for Detection of Damage Precursors in Composites." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86148.

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Damage precursor in composites can lead to large structural damages, such as delamination, in carbon fiber reinforced plastic (CFRP) composites due to complex load conditions and environmental effects. In addition, multiple types of damage precursors including micro-scale matrix cracks, fiber pull-out from matrix, and fiber breakages, are extremely difficult to detect due to the limitation of resolution of current non-destructive evaluation (NDE) technologies. This paper presents a photo-acoustic based non-contact NDE system for the detection of damage precursors with extremely high resolution up to one hundred micrometers. This system consists of three major components: picoseconds pulsed laser based ultrasonic actuator, ultrasound receiver, and data processing and computing subsystem. Picoseconds pulsed laser is used to generate ultrasonic propagations in composites during the NDE process, and the ultrasound signals are recorded by the ultrasound receiver. Three-dimensional microstructure of the individual composites grid within the composite is able to be reconstructed for further analysis. The size and position of the damage precursors are evaluated with high accuracy up to 100 μm. The experimental results demonstrate that this imaging system is able to provide a novel non-contact approach with extremely high resolution for damage detection of CFRP composites. In addition, the developed NDE system has a wide industrial application in aerospace, automobile, civil, mechanical, and other key industries.

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Prashantha, M., E. S. R. Gopal, K. Ramesh, Alka B. Garg, R. Mittal, and R. Mukhopadhyay. "Precursors for Carbon Nitride Synthesis." In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3606351.

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Raziah, A. Z., A. R. Junizah, and N. Saifuddin. "Synthesis of carbon nanotubes using natural carbon precursor: Castor oil." In INTERNATIONAL CONFERENCE ON FUNDAMENTAL AND APPLIED SCIENCES 2012: (ICFAS2012). AIP, 2012. http://dx.doi.org/10.1063/1.4757535.

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SHEN, TONGTONG, CHUNYU LI, BENJAMIN P. HALEY, SAAKETH DESAI, and ALEJANDRO STRACHAN. "Molecular Structure of PAN-based Carbon Fiber Precursor." In American Society for Composites 2017. Lancaster, PA: DEStech Publications, Inc., 2017. http://dx.doi.org/10.12783/asc2017/15315.

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Bakar, Suriani Abu, Salina Muhamad, Azira Abdul Aziz, Noor Asnida Asli, Maryam Mohammad, Muhammad Salleh Shamsudin, Roslan Md Nor, and Mohamad Rusop. "CVD growth of carbon nanotubes from palm oil precursor." In 2012 IEEE Symposium on Business, Engineering and Industrial Applications (ISBEIA). IEEE, 2012. http://dx.doi.org/10.1109/isbeia.2012.6422908.

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Sundaresan, Mannur, Felix Abali, Salman Haq, Robert Sadler, Vishnu Avva, Dough McPherson, and Kunigal Shivakumar. "Development of carbon/carbon composites from PT-30 as a precursor matrix." In 39th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-1901.

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Reports on the topic "Carbene precursor"

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Mishra, Pranay, Asha Hall, and Michael Coatney. Embedded Carbon Nanotube Networks for Damage Precursor Detection. Fort Belvoir, VA: Defense Technical Information Center, January 2014. http://dx.doi.org/10.21236/ada599174.

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Ring, M. A., and H. E. O'Neal. The Chemistry of Precursors to Silicon Carbide. Fort Belvoir, VA: Defense Technical Information Center, March 1988. http://dx.doi.org/10.21236/ada193062.

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Abhiraman, Agaram S. Precursor Structure - Fiber Property Relationships in Polyacrylonitrile- Based Carbon Fibers. Fort Belvoir, VA: Defense Technical Information Center, April 1992. http://dx.doi.org/10.21236/ada249888.

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Ohuchi, Fumio, and Rajandra Bordia. Precursor-Derived Nanostructured Silicon Carbide Based Materials for Magnetohydrodynamic Electrode Applications. Office of Scientific and Technical Information (OSTI), July 2019. http://dx.doi.org/10.2172/1542886.

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Caulton L. Irwin. PRODUCTION AND SCREENING OF CARBON PRODUCTS PRECURSORS FROM COAL. Office of Scientific and Technical Information (OSTI), May 2001. http://dx.doi.org/10.2172/835013.

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Chung, T. C. Mike. Developing a New Polyolefin Precursor for Low-Cost, High-Strength Carbon Fiber. Office of Scientific and Technical Information (OSTI), May 2021. http://dx.doi.org/10.2172/1808293.

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Norris, Jr, Robert E., Felix L. Paulauskas, Amit K. Naskar, Michael C. Kaufman, and Ken D. Yarborough. DEVELOPMENT AND COMMERCIALIZATION OF ALTERNATIVE CARBON PRECURSORS AND CONVERSION TECHNOLOGIES. Office of Scientific and Technical Information (OSTI), April 2014. http://dx.doi.org/10.2172/1147699.

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Lewis, Randolph V. Spider silk MASP1 and MASP2 proteins as carbon fiber precursors. Office of Scientific and Technical Information (OSTI), June 2017. http://dx.doi.org/10.2172/1374997.

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Lewis, I. C., R. T. Lewis, and H. K. Mayer. Coal precursors for production of carbon and graphite products. Final report. Office of Scientific and Technical Information (OSTI), April 1996. http://dx.doi.org/10.2172/371429.

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Norris, Jr, Robert E., Michael C. Kaufman, Amit K. Naskar, Felix L. Paulauskas, and Ken D. Yarborough. Development and Commercialization of Alternative Carbon Fiber Precursors and Conversion Technologies. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1158746.

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