Dissertations / Theses on the topic 'SiC nanoparticles'
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Strandqvist, Carl. "The Functionalization of Epitaxial Graphene on SiC with Nanoparticles towards Biosensing Capabilities." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-120502.
Full textPinate, Santiago. "Study of particle-current-electrocrystallization interactions in electroplating of Ni/SiC coatings." Licentiate thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Material och tillverkning, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-43548.
Full textKompositbeläggning har stort potential tack vare möjligheten att kombinera två material i samma ytskikt. På detta sätt kan nya ytegenskaper skräddarsys och appliceras på ett materials yta. Elektrodeposition är den tillverkningsmetod som har störst potential att uppnå kompositbeläggningar, i synnerhet nanokompositer. Ett kunskapsgap existerar mellan elektrodeposition under laboratorieförhållanden, som beskrivet i vetenskaplig litteratur, och hur processen går till i industriell miljö. Medan industriell tillämpning av mikrokompositer pågått ungefär tio år, så har produktion av Ni/SiC nanokompositbeläggningar fortfarande inte nått fabriksgolvet. Detta är en konsekvens av bristande förståelse kring mekanismer för samdeposition av nanopartiklar som leder till varierande resultat. Produktion av nanokompositbeläggningar är mycket mer känslig för processparametrar jämfört med mikrokompositer. Korrelationer mellan parametrar och dess inverkan på samdeposition är fortfarande inte fullt identifierade och förstådda. Modeller för samdeposition som föreslås i vetenskaplig litteratur är endast giltiga under särskilda förhållanden. Kompositdeposition kan uppvisa avvikande eller till och med motsatt beteende om variabler förändras. Huvudmålet med detta arbete är att identifiera interaktioner mellan partikel, ström och elektrokristallisering under tillverkning av Ni/SiC nanokompositer. En serie av experiment är utvecklade för att isolera variabler och identifiera de parametrarna som kontrollerar dessa interaktioner och dess inverkan på ytans egenskaper. I denna avhandling identifieras strömtäthet, typ av ström, och partiklars storlek som primära variabler som kontrollerar metallkristallisering och beläggningens egenskaper. Bland många parametrar, visades en specifik vågform på strömmen i omvänd pulsläge öka samdepositionen effektivt, ledande till en fördubbling av andelen nanopartiklar jämfört med andra tekniker. Ultraljud tillämpades som metod för omrörning av depositionsbadet för förbättrad stabilitet och fördelning. Effekten av ultraljud på samdepositionen av metallkristallisering studeras och jämfört med tyst tillstånd. Dessutom har en ytbehandling för partiklarna visats framgångsrik för att få godtyckliga partiklar att bete sig likt Ni i depositionsbadet. Detta ledde till att samdepositionens takt ökade med en faktor av två till tre jämfört med obehandlade partiklar. Både ultraljud och ytbehandling av partiklarna ledde till minskad aggregation vilket förbättrade fördelningen av partiklar och metallstruktur och därigenom ökad hårdhet. Arbetet bevisar synergieffekten mellan partiklar och metallstruktur vilket påverkar beläggningens slutliga egenskaper. Vid utveckling av nya ytbeläggningar ska därför inte bara mängden partiklar beaktas utan även dess interaktion med elektrokristalliseringsprocessen.
Sengele, Armelle. "Décontamination et dépollution par photocatalyse : réalisation d'un dispositif d'élimination d'agents chimiques toxiques et de polluants dans l'air et dans l'eau." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAF066/document.
Full textThis work consists in the synthesis of titanium dioxide nanoparticles for the decontamination of chemical warfare agents by photocatalysis. The main goal is to optimize the photocatalyst to eliminate diethylsulfide (DES), simulating yperite. The oxidation of DES generates sulfates that lead to the poisoning of TiO2. Thus, the aim is to limit this deactivation and to avoid a release of harmful products. A solution is to increase the specific suface area by two methods: doping TiO2 with tantalum or tin and adding a porogen during the sol-gel synthesis. These optimized catalysts exhibit high conversion rates for DES elimination in the gas phase under a continuous flow thanks to their high specific surface area and their adsorption properties. The best catalysts are immobilized on tridimensional β-SiC foams. These photocatalytic foams deactivates slower than the TiO2 powders. A regeneration by an NaOH solution can restore their initial activity. It allows a possible industrial application for these catalysts. This thesis opens the way to realize a decontamination prototype for air to eliminate chemical warfare agents
Al-Sid-Cheikh, Maya. "Impact des oxydes de fer naturels et des nanoparticules manufacturées sur la dynamique des éléments traces dans les sols de zones humides." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S144.
Full textNanoscience is based on changes in particle properties when their diameter is below 100 nm (ie nanoparticles, NPs). Considering the increasing use of such NPs and their discharge into the environment, the assessment of their risks to human health and the environment is a major issue. Underneath the protection of waters and soils, the surface water assessment quality is particularly important, especially in wetlands, where the toxic metals dynamic (e.g. As, Pb, Ni, Cr , Hg) is complex and depends on the redox conditions of the environment. As magnetite (nano-Fe3O4), a natural or manufactured NP, is known for its significant adsorption capacity with heavy metals, their interactions in riparian wetlands with trace metals (TMs) remain critical concerning their direct of indirect impact on trace metals (TMs) mobility. The objective of this thesis was to study the role of manufactured nano-Fe3O4 (~ 10nm) and natural iron oxides on the TMs dynamics in wetland surface waters and soils. Therefore, in a first part considering natural colloidal precipitates from reoxidation products from riparian areas (subject to redox oscillations), a spatial distribution of elements was performed using nanoSIMS isotope mapping (i.e. 75As-, 56Fe16O-, sulfur (32S-) and organic matter (12C14N-), while the sulfur speciation was evaluated X-ray adsorption at K edge of the sulfur (S) (XANES). These analyzes allowed to highlight the interactions between natural iron oxides, natural organic matter (NOM) and a toxic metalloid, As. Our results suggest, with a statistical colocalization of nanoSIMS images, the existence of two interaction types: (1) 12C14N-, 32S-, 56Fe16O- and 75As-, and (2) 12C14N-, 32S- and 75As-. The coexistence of the oxidized and reduced forms of S, confirmed by the XANES analyses might be attributed to the slow oxidation kinetic of MON. Thus, this first part shows that in addition to the known interactions between MON, iron oxides and As, a possible direct interaction between As and NOM through sulfur functional groups (e.g. thiols) are also possible in oxidized environment. In a second part, the effect of nano-Fe3O4 (~ 10 nm) on trace elements (TEs) and colloids mobility in the organomineral horizon of a natural wetland soil was assessed using soil columns. Our results show that the nanoparticles coating influences the mobility of NOM and TMs. Indeed, the TMs mobility increases in presence of naked nano-Fe3O4, suggesting associations where NOM stabilizes the nanoparticles and increase the nanoparticles and associated TMs mobility. This mechanism seems less possible with coated nano-Fe3O4 where MON blocks the coating adsorption sites and therefore the adsorption of metals
Matras, Jan. "Aplikace reaktivních nanočástic do SAC pájecí pasty." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377074.
Full textLin, Yu-Pu. "Functionalization of two-dimensional nanomaterials based on graphene." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4727.
Full textIn order to promote 2D materials like graphene to their numerous applications, new methodsaltering their electronic and chemical properties have to be mastered. In this thesis, theprocesses of chemical doping and hydrogenation of monolayer graphene grown on SiC are investigated. Nitrogen atoms are successfully substituted in the graphene lattice using plasma-basedmethods. The bonding configurations of the incorporated N can be controlled via the nature and energy of exposing species and the thickness of the pristine graphene. An n-type doping, revealed by angle-resolved inverse photoemission spectroscopy (ARIPES), is found in most N-doped graphene and is assigned to the presence of graphitic-N. Hydrogenations of the buffer layer of graphene (BLG) on SiC at ambient or high temperatures saturate the remaining Si dangling bonds at BLG/SiC interface in two different ways, either by inducing additional C-Si bonds or by H intercalation. This results in 2D materials with distinct characters, an insulating, graphane-like H-BLG or a quasi-free-standing graphene, which may be used as a new concept for the engineering of graphene-based devices. The interactions between pi-conjugated molecules and the functionalized graphene are also investigated. The unoccupied states of molecules are altered by the presence of incorporated N, but the degradation of molecules due to low-energy electron exposure seems not enhanced by the doping nitrogen under the studied conditions. Nevertheless, the functionalization of graphene is demonstrated and its electronic and chemical properties are carefully studied, which should help to faster further applications employing functionalized graphene
Ditto, Andrew James. "Biodegradable Nanoparticles for Use as an Inhalable Antimicrobial and as a Receptor Targeted Delivery Device." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1280335303.
Full textMcKenzie, Lallie Cobb. "Mechanistic insights on nanoparticle formation : investigation of reaction pathways and development of controlled synthesis for triphenylphosphine-stabilized undecagold /." Connect to title online (ProQuest), 2009. http://proquest.umi.com/pqdweb?did=1798969441&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.
Full textPawluk, Tiffany. "Iridium nanoparticles : a density functional theory study /." Available to subscribers only, 2005. http://proquest.umi.com/pqdweb?did=1075692711&sid=20&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Full textSandra, Fabien. "Elaboration de matériaux céramiques poreux à base de SiC pour la filtration et la dépollution." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20015.
Full textSince the 90's, Diesel engines are widely used though they are criticized because of the pollution emitted. The constant updates of the Europeans norms (since 1993) concerning the diesel emissions imply a perpetual improvement of filtration techniques. The Diesel Particles Filter (DPF) technology used by the car manufacturer PSA Peugeot Citroën is one of the best ways to fulfill the limitation for diesel emissions. However, particles emission issue is still a problem and future legislations more and stricter, so an improvement of the DPF process is required to respect them. In this context, we have considered the elaboration of two different types of porous membranes on the DPF channels. The first one was in SiC, and had the aim to enhance the filtration efficiency. In this way, the smallest particles matter could be locked in the filter. The second kind of membrane integrates a catalytic phase inside the ceramic matrix, so in addition to the filtration aspect, it could improve soot combustion during the regeneration step of the DPF.The first chapter of my thesis deals with the literature corresponding to the subject, i.e. the DPF technology, non-oxides Si-based ceramics, and in particular those obtained through polymer-derived ceramics route (also called PDCs route). Then, ceramic coatings and catalytic phases are also treated. In the second chapter, we have considered the PDCs route and preceramic polymers to elaborate a SiC coating inside the DPF channels. We employed the dip-coating technique to overlay the channel surface with the AHPCS precursor of SiC (allylhydridopolycarbosilane), then, a pyrolysis under argon allows obtaining a SiC coating, in order to decrease the average pore diameter of the DPF (keeping an efficient filtration while avoiding overpressure) to catch soot nanoparticles evolving from Diesel engine.The third part of my PhD deals with the elaboration of another kind of coating for the DPF channels including a catalytic phase in the ceramic membrane. For this purpose, the microemulsion synthesis has been considered to prepare SiC-MxOy membrane. Further, we incorporated various catalytic phases based on Ce, Fe and Pt as activators of soot combustion. By employing the dip-coating technique, we successfully covered the DPF channels of our monoliths with the aforementioned microemulsion and after a heat treatment under controlled atmosphere; a porous coating consisting of the catalytic phase and the ceramic matrix was obtained. From this film, the porosity has been modified by lowering the diameter of the initial pores, but also by getting an additional porosity due to the polymer conversion and the surfactant decomposition. Catalytic sites in the ceramic have improved the soot combustion by lowering the temperature of the combustion.The fourth chapter introduces the elaboration of porous SiBCN materials through two approaches, replication and warm-pressing with sacrificial template (polymethylmethacrylate, PMMA). The SiBCN ceramic is a promising material due to its high mechanical properties and its stability at high temperature (1700-1800°C). By coupling the PDCs way with those two techniques, we are able to elaborate SiBCN porous materials which features can be tuned according to the technological application envisaged
Ceylan, Abdullah. "Core/shell structured magnetic nanoparticles synthesized by inert gas condensation." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 139 p, 2007. http://proquest.umi.com/pqdweb?did=1397915001&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textMi, Changwen. "Nanoparticles under the influence of surface/interface elasticity." Laramie, Wyo. : University of Wyoming, 2006. http://proquest.umi.com/pqdweb?did=1296091581&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Full textFox, James Brent. "A study of nanoparticle aggregation using novel x-ray and permeability techniques a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2008. http://proquest.umi.com/pqdweb?index=33&sid=1&srchmode=1&vinst=PROD&fmt=6&startpage=-1&clientid=28564&vname=PQD&RQT=309&did=1605147081&scaling=FULL&ts=1251313913&vtype=PQD&rqt=309&TS=1251313928&clientId=28564.
Full textHelgeson, Matthew E. "Structure, rheology, and thermodynamics of wormlike micelle-nanoparticle mixtures." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 536 p, 2009. http://proquest.umi.com/pqdweb?did=1818417471&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textPrincipal faculty advisors: Norman J. Wagner, Dept. of Chemical Engineerin; and Eric W. Kaler, College of Engineering. Includes bibliographical references.
Renaud, Adèle. "Semi-conducteurs de type p pour une application en cellules solaires à colorant." Nantes, 2013. https://archive.bu.univ-nantes.fr/pollux/show/show?id=bc5d055e-878e-4b2d-af7c-44949293c4df.
Full textThese thesis works focused on the realization of p-type dye sensitized solar cells (DSSCp) with a photocathode using an alternative to NiO. The objective was to replace the p-type semiconductor by more transparent and conductive materials and displaying a lower valence band energy to enable the generation of higher open circuit voltages (Voc). In this context, CuGaO2, LaOCuS and ZnO:N compounds were synthesized in nanoparticles form, characterized by X-ray diffraction and their flat band potentials (Vfb) were determined by complex impedance spectroscopy. As a result CuGaO2, LaOCuS and ZnO:N have Vfb significantly higher (0. 49 V/SCE), similar (0. 36 V/SCE) and lower (0. 20 V/SCE) than that of NiO (0. 33 V/SCE). Thus, dye sensitized solar cells based on the delafossite material were made and tested with the PMI-NDI dyad as dye and a cobalt complex as redox mediator. A greater VOC than that observed for NiO under the same conditions is highlighted. This result is unfortunately altered by a lower short circuit current (Jsc). To try to overcome this drawback, CuGaO2:Mg materials with a higher specific surface area than that of CuGaO2 have been prepared and tested. Simultaneously, we have focused on the achievement of cells based on LaOCuS, more conductive material than NiO. In addition, the p-type conductivity of ZnO:N was further characterized
Martinson, Carol A. "Evaluation of cupric oxide (CuO) nanoparticles in the removal of arsenic species from groundwater across a wide range of natural conditions." Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1594490421&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Full textYan, Zhicheng. "Structural, microstructural, and magnetic properties of terbium, gadolinium, and samarium cobalt nanoparticles." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 216 p, 2009. http://proquest.umi.com/pqdweb?did=1833641681&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textXiao, Li. "Structural and electronic properties and applications of platinum and gold nanoparticles /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1342740081&sid=3&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Full textAngelos, Sarah Ann. "Molecular machines supported on mesoporous silica nanoparticles for drug delivery applications." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1835827851&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Full textDziedzic, Tomasz. "Electrochemistry of layer-by-layer films containing redox active MnO₂ nanoparticles." Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1798480871&sid=2&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Full textOpitz, Armin Walter. "Structural and functional investigations of a molecular imaging nanoparticle for magnetic resonance imaging of oncogene expression in the pancreas." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 490 p, 2008. http://proquest.umi.com/pqdweb?did=1459924631&sid=13&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textPrincipal faculty advisors: Norman J. Wagner, Dept. of Chemical Engineering, University of Delaware; Eric Wickstrom, Dept. of Biochemistry and Molecular Biology, Thomas Jefferson University. Includes bibliographical references.
Erdem, Ayça. "Short-term toxicity of photocatalytic titanium dioxide to bacteria under ambient conditions." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 204 p, 2008. http://proquest.umi.com/pqdweb?did=1679680941&sid=14&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textCromwell, Jaya. "Advances in nanoparticle contrast agents for magnetic resonance imaging /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 56 p, 2008. http://proquest.umi.com/pqdweb?did=1597632781&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textLin, Ming-Yu. "Interactions between titanium dioxide nanoparticles and algal cells at moderate particle concentration." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 98 p, 2008. http://proquest.umi.com/pqdweb?did=1597633661&sid=17&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textPatlolla, Kiran Kumar. "Free vibration analysis: comparison between continuum mechanics and molecular mechanics models a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=1786737281&SrchMode=1&sid=2&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1268928551&clientId=28564.
Full textMullaugh, Katherine M. "Formation and persistence of cadmium sulfide nanoparticle in aqueous solution." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 232 p, 2009. http://proquest.umi.com/pqdweb?did=1885682071&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textLi, Guifeng. "Syntheses and functionalizations of magnetic iron oxide nanoparticles for applications in organic chemistry /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1328058811&sid=3&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Full textWang, Hongli. "A study of the structural, microstructural and magnetic properties of iron-platinum and cobalt-platinum type nanoparticles." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 200 p, 2007. http://proquest.umi.com/pqdweb?did=1354136761&sid=4&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textKearns, Gregory Justin. "Engineering interfaces at the micro- and nanoscale for biomolecular and nanoparticle self-assembled devices /." view abstract or download file of text, 2007. http://proquest.umi.com/pqdweb?did=1417810561&sid=2&Fmt=2&clientId=11238&RQT=309&VName=PQD.
Full textTypescript. Includes vita and abstract. Includes bibliographical references (leaves 158-174). Also available for download via the World Wide Web; free to University of Oregon users.
Chou, Hsun-Wen. "Nanotoxicology from nano titanium dioxide particle size effect on Ceriodaphnia dubia to death mechanism /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 77 p, 2008. http://proquest.umi.com/pqdweb?did=1597633671&sid=14&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textChatterjee, Abhijit. "Nanoscale modeling and control of self-assembled nanoparticle arrays using a hierarchy of multiscale models." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 407 p, 2007. http://proquest.umi.com/pqdweb?did=1397912451&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textFoster, Evan Wayne. "Self-assembly of extended, high-density gold nanoparticle monolayers on silicon dioxide /." view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1188875831&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.
Full textTypescript. Includes vita and abstract. Includes bibliographical references (leaves 173-182). Also available for download via the World Wide Web; free to University of Oregon users.
Fan, Jinda. "Syntheses and surface modifications of gold and iron oxide nanoparticles for organic and biomedical applications /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1140192751&sid=11&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Full textDuanmu, Chuansong. "Expanding applications of iron oxide nanoparticles by surface functionalization : from magnetic resonance imaging to nano-catalysis /." Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1967917191&sid=4&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Full textBuzby, Scott Edward. "The effect of doping titanium dioxide nanoparticles on phase transformation, photocatalytic activity and anti-bacterial properties." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 120 p, 2008. http://proquest.umi.com/pqdweb?did=1459918071&sid=9&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full textJespersen, Michael L. "Engineering the macro-nano interface : designing the directed self-assembly and interfacial interactions of gold nanoparticle monolayers. /." Connect to title online (ProQuest), 2007. http://proquest.umi.com/pqdweb?did=1525704531&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.
Full textTypescript. Includes vita and abstract. Includes bibliographical references (leaves 164-192). Also available online in Scholars' Bank; and in ProQuest, free to University of Oregon users.
Alvarenga, Marinho Andre Luiz. "Development of catalytic process for biogas upgrading : study of structure and oxygen mobility on Ni and Pt nanoparticles encapsulated catalysts." Thesis, Poitiers, 2020. http://www.theses.fr/2020POIT2272.
Full textDry reforming of methane (DRM) is a catalytic process able to convert the biogas generated from biomass degradation into syngas, which has many industrial applications. However, coke formation and metal sintering are the main drawbacks to upgrade this technology to an industrial scale. This work evaluates the effect of Ni encapsulation in two different structures: embedded nanoparticles and distributed nanoparticles over mesoporous support. Results showed that Ni embedded in ceria improved the resistance to sintering along the reduction at high temperature (800 °C) and led to a higher metal-support interaction compared to impregnated catalyst. Doping ceria with Zr inhibited the growth of CeO2 and Ni clusters in embedded catalysts and increased the oxygen mobility as revealed by oxygen isotopic exchange experiments. The doping with Gd and Sm did not enhance thermal stability on the material and the sintering is still observed. The nature of metal exchanging Ni by Pt did not affect the promotional effects of encapsulation in embedded structures. Ni-based mesoporous mixed CeO2-Al2O3 oxide catalysts prepared by one pot Evaporation Induced Self Assembly (EISA) presented small metallic Ni particles (< 5 nm). Different behavior occurs with CeO2-Al2O3 oxide prepared by EISA method when Ni is post-impregnated because of the presence of isolated larger Ni particles which promotes the decomposition of CH4. Finally carbon deposits were not detected over embedded Ni@CeZrO2 after 24 h of reaction and meosoporous 10Ni- CeO2-Al2O3 after 72 h of reaction and, therefore, these catalysts presented promising results in this work for biogas upgrading process by dry reforming of methane reaction
Clark, Michael A. "Effect of nanoparticles on friction and wear of 2-D and 3-D carbon-carbon composite disc brakes /." Available to subscribers only, 2005. http://proquest.umi.com/pqdweb?did=1095432851&sid=8&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Full text"Department of Mechanical Engineering and Energy Processes." Includes bibliographical references (leaves 84-86). Also available online.
Kang, Seung Hyun. "Engineered E. coli and its application in bioremediation and nanotechnology." Diss., UC access only, 2009. http://proquest.umi.com/pqdweb?index=59&did=1871853251&SrchMode=1&sid=2&Fmt=7&retrieveGroup=0&VType=PQD&VInst=PROD&RQT=309&VName=PQD&TS=1270148636&clientId=48051.
Full textPanday, Namuna. "Scanning Ion Conductance Microscopy for Single Cell Imaging and Analysis." FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3477.
Full textYukna, Jennifer. "Computational and experimental investigations of the structural properties, electronic properties, and applications of silver, gold, mercury selenide, silver sulfide, and nickel sulfide nanoparticles /." Available to subscribers only, 2007. http://proquest.umi.com/pqdweb?did=1482010021&sid=2&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Full text"Department of Chemistry and Biochemistry." Keywords: Electronic properties, Silver, Gold, Mercury selenide, Silver sulfide, Nickel sulfide, Nanoparticles. Includes bibliographical references (p. 170-180). Also available online.
Bouclé, Johann. "Elaboration et étude des propriétés électro-optiques de matériaux hybrides à base de nanocristaux de carbure de silicium." Phd thesis, Université du Maine, 2004. http://tel.archives-ouvertes.fr/tel-00007825.
Full textGollamandala, Deepika Rao. "Brownian dynamic simulations of nanoparticle dispersions in polymer solutions a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=13&did=1913184241&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1265056184&clientId=28564.
Full textVicario, Gomez Iban. "Influence des nano-particules d’alumine (Al2O3) et de di-borure de titane (TiB2) sur la microstructure et les propriétés de l’alliage Al-Si9-Cu3-Fe1 pour des applications de fonderie à haute pression." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14420/document.
Full textThe work has been focused on the study of the influence of TiB2 and Al2O3 nano-particles (up to 1 wt. %) on the properties and physical features of an aluminium casting alloy, Al-Si9Cu3Fe1.Samples have been obtained through the High Pressure Die Casting (HPDC) process and compared with unreinforced samples obtained at the same conditions. It has been observed that the Al2O3 and TiB2 particles have a direct influence on several features of the alloy such as the microstructure and precipitating phases as well as in the improvement of the soundness and mechanical and electrical properties. Al2O3 and TiB2 particles can be used to tailor the properties of the alloy and to match the specifications of light weight applications
"Reinforcement of syntactic foam with SiC nanoparticles." Thesis, Florida Atlantic University, 2009. http://purl.flvc.org/FAU/359923.
Full textby Debdutta Das
Thesis (M.S.C.S.)--Florida Atlantic University, 2009
Includes bibliography
Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web
Han, Yi-Fan, and 韓依帆. "Preparation and application in electromagnetic wave absorption of SiC nanoparticles embedded in Polyacrylonitrile through electrosppinning." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/uhw4m5.
Full text明新科技大學
化學工程與材料科技系碩士班
105
In this study, silicon carbide/polyacrylonitrile (SiC/PAN) composite nanofibers material for absorbing electromagnetic waves were prepared by electrospinning. In this experiment, polyacrylonitrile (PAN) was mixed with dimethylformamide (N, N-dimethyformamide, DMF) solution by changing collecting plate distance four process parameters: PAN concentration, collecting plate voltage, feeding rate. The effects of these parameters on the morphology and diameter of PAN nanofibers were discussed. Synthesis of SiC/Carbon composite nanofiber fraction, respectively, adding different concentrations of SiC nanoparticles into the precursor solution, and then the above PAN conditions for electrospinning. At the same time, the electromagnetic wave absorption of SiC/Carbon composite nanofibers with different weight percentages was studied. In this study, the fiber morphology and diameter were observed by scanning electron microscopy. The X-ray diffraction apparatus was used to identify the SiC/Carbon phase. The weight change of the sample was observed by thermogravimetric analysis and the microstructure of the penetrating electron microscope Identification and four-point probe electrical analysis, and then use the vector network analyzer, the radar wave band (3-18 GHz) of the electromagnetic properties of the study. The results showed that PAN nanofibers could obtain more uniform diameter PAN nanofibers at a concentration of 10 wt%, a voltage of 20 kV, a feeding rate of 0.025 ml/min and a collection distance of 15 cm. The surface roughness increases with the addition of 15 wt% SiC nanoparticles, which means that the SiC nanoparticles begin to agglomerate, but there is no obvious aggregation of silicon carbide nanoparticles compared with 20 wt%. At room temperature measurement, the sample number (A2) increases with the thickness of the maximum reflection loss increases, and will move to low frequency, the thickness of 8 mm, in the 13.79-17.54 GHz frequency range, the reflection loss is less than -10 dB of the bandwidth of 3.75 GHz, the maximum reflection loss at the radar frequency of 15.29 GHz is -38.19 dB.
Chen, Jian-Jr, and 陳建志. "STUDIES ON THE IONIC CONDUCTIVITY OF PEO/LiClO4 SOLID POLYMER ELECTROLYTE BLENDED WITH NANOPARTICLES (TiO2, SiO2, CdS, SiC) AND TEOS." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/12233586924224516752.
Full text大同大學
化學工程研究所
91
It has been found that the nano-sized materials are very helpful in the solid polymer electrolyte and therefore it has become an important research field. In this study, the solid polymer electrolyte have been prepared based on poly(ethylene oxide) (PEO) blended with different weight percentages of alkali metal salt (LiClO4). The X—ray diffraction and DSC studies reveal the crystallization of PEO, which is reduced with increasing the content of LiClO4. From the AC impedance measurements, the ionic conductivity of the PEO/LiClO4 SPE systems increases initially with decreasing [EO]/[Li+] ratio and reaches maximum value (7.13 × 10 — 6 S/cm) at the [EO]/[Li+] ratio of 10, but decreases as the [EO]/[Li+] ratio is further decreased. It can be found that SPE system blended with nanoparticles ((TiO2, SiO2, and CdS), and tetraethoxysilane (TEOS)) can enhance the ionic conductivity, except for SiC. The highest ionic conductivity of P(EO)8LiClO4 blended with 3 wt% of TEOS can reach 7.83 × 10 — 4 S/cm at room temperature, which is close to those of lithium liquid electrolyte lithium batteries (10 — 2 ~ 10 — 3 S/cm) used extensively at present. The ionic conductivities of P(EO)8LiClO4 SPE system blended with 3 wt% of SiO2, TiO2, and CdS is 2.9 × 10 — 4, 3.9 × 10 — 4, and 4.83 × 10 — 4 S/cm, respectively. In other words , the order of ionic conductivity for SPE blended with 3 wt% of nanoparticles is TEOS > CdS > TiO2 > SiO2 > SiC. The result can be confirmed by SEM micrographs. It can be found that SPE system blended with nanoparticles (TiO2, SiO2, and CdS) can improve the tensile strength stability of SPE film.
Lu, Yan Jiun, and 盧晏君. "Electrical property of SiC nanoparticle in D.I. water." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/76511592119121961613.
Full text國立臺北科技大學
製造科技研究所
90
The electrical properties of SiC nanoparticles are investigated in this research. Different acid-base solutions and voltages are our recipes which can observe SiC nanoparticles with electrified property and precipitate phenomenon. Additionally, the transparent thin film is also studied found in the anode with an experiment of pH2 solution. From our investigation, if found that SiC nanoparticles in D.I. water can resist oxidation and have an excellent chemical stability. NaOH and H2SO4 in nanoparticle solution are mixed to generate pH7, pH10 and pH2 solution respectively. At different voltages, Cu electrode inserts into solution to observe the status of particle around electrode and to monitor phenomenon for SiC precipitates solution by particle size analyzer. Furthermore, a transmission electron microscope is need to observe the status of powder in the different solutions and a XRD for analysis of the compositions about SiC particle. In the acid-base solution, three-electrode makes the curve of anodic polarization for SiC particle that finds the potential of positive pole reduction to get electrical property of SiC particle fully. In the other way, after pH2 reaction, a transparent film on the Cu electrode was found. The transparent film is observed in a microhardness test. A field emission scanning electron microscope and an energy dispersive spectrometers analyze the substance of film’s surface to gain compositions and characters. The charge of SiC nanoparticles in D.I. water is negative. The collect scale is larger when the voltage is higher. The pH10 solution make the charge of the surface of SiC nanoparticles more strong. In the other way, a transparent film isn’t SiC. the time of reaction is longer and then the thickness of the transparent film is much more; when the voltage is higher and the transparent film is denser.
Lee, Yuhan, and 李育翰. "Nanoparticle fractionation of silica sol by the HPLC-SEC." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/31694254854844875083.
Full text明志科技大學
化學工程研究所
100
In this study, size exclusion liquid chromatography (HPLC SEC) fractionates of nanoparticles of silica sol . Discuss the preparation of silica sol dispersion diameter grading efficiency and operating conditions for surface modification and particle size fractionation. In this study, silica sol of nanoparticles classification experiments is divided into three types: self-made silica sol, silica sol of silica nano powder to deploy, as well as commercially available.Regulation of nano particle size of the Stöber method made sol by aging time the availability of two particle size distribution of silica sol. Commercially available silica nano powder homogenizer, add three modifier: Sodium n-dodecyl sulfate (SDS), Triton X-100, Acetylacetone (HACAC).Among them, only SDS on particle dispersion enhance the effect of surface modification effect of the three to avoid the silica sol particles and the column packing adsorption. In this experiment, a commercially available silica sol, self made silica sol and the effect of commercially available nano gold sol, to investigate the particle size fractionation experiments and nano particle size classification. The results showed that poor grading effect of the commercially available silica sol and a commercially available nano gold colloids (commercially available silica sol Rs = 0.23, a commercially available nano gold colloids Rs = 0.49), while the homemade silica sol the difference of the two kinds of particle size distribution and better particle size fractionation effects (self made silica sol Rs = 0.55).
Coelho, David José Pereira. "Fabrication of Gd5 (Si1-xGex )4 nanoparticles by femto and nanosecond pulsed laser ablation in liquids." Master's thesis, 2018. https://hdl.handle.net/10216/118851.
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