Дисертації з теми "Properties Tuning"
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Lloyd, Gareth Owen. "Anion-tuning of supramolecular gel properties." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/186/.
Повний текст джерелаMakhort, Anatolii. "Tuning photovoltaic properties in ferroelectric materials." Thesis, Strasbourg, 2020. http://www.theses.fr/2020STRAE031.
Повний текст джерелаConventional solar cells are ultimately approaching their fundamental limit. Although electrically polar materials provide an alternative solution, understanding their photovoltaic properties, as well as a scarcity of efficient compounds constitute an important challenge. Therefore, this thesis was devoted to finding a model photovoltaic compound and optimization of its performance. As a result, the photovoltaic properties were discovered in the PMN–xPT complex. It was shown a nonlinearity in the photocurrent in the saturated polarization state that also results in optical memory effect. The stress and temperature-dependent studies of the photovoltaicity were performed as well. The overall obtained results strongly suggest the highly tunable nature of photovoltaic effects and open the prospect for additional degrees of freedom to increase ferroelectric-based photovoltaic cells efficiency and beyond
Ustahüseyin, Oya [Verfasser]. "Tuning mechanical properties of hydrogels / Oya Ustahüseyin." Mainz : Universitätsbibliothek Mainz, 2018. http://d-nb.info/115184974X/34.
Повний текст джерелаFrei, Katherine Rebecca. "Morphology Tuning and Mechanical Properties of Nanoporous Gold." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/91899.
Повний текст джерелаMS
Khademi, Ali. "Tuning graphene’s electronic and transport properties via adatom deposition." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62588.
Повний текст джерелаScience, Faculty of
Physics and Astronomy, Department of
Graduate
Mickenberg, Seth F. (Seth Fox). "Tuning the photophysical properties of amidophosphine complexes of copper." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/49753.
Повний текст джерелаVita.
Includes bibliographical references (leaves 23-24).
A series of monomeric copper complexes that allow for the tuning of the emission properties is reported. Luminescence lifetimes up to 150 [mu]s are observed in benzene solution at ambient temperature, which are comparable to the lifetimes of the longest-lived previously reported copper luminophores. These complexes also exhibit quantum yields up to 0 = 0.70 at 298 K. The results of time-dependent density functional theory (TDDFT) calculations indicate emission from a triplet state in all cases. The calculations also successfully correlate the energy of the transition from this triplet state to the energy of the observed emission. Such luminescence from a first-row metal is highly unusual, especially when considering the phosphine-based ligand framework used.
by Seth F. Mickenberg.
S.M.
Nicolas, Chantel I. "Tuning the electronic properties of carbon-based nanohybrid materials." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2014. http://digitalcommons.auctr.edu/dissertations/1530.
Повний текст джерелаGötz, Sebastian, Claas Wilke, Matthias Schmidt, Sebastian Cech, and Uwe Aßmann. "Towards Energy Auto Tuning." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-116966.
Повний текст джерелаGötz, Sebastian, Claas Wilke, Matthias Schmidt, Sebastian Cech, and Uwe Aßmann. "Towards Energy Auto Tuning." Technische Universität Dresden, 2010. https://tud.qucosa.de/id/qucosa%3A26982.
Повний текст джерелаHe, Zhengyu. "Tuning the electrical and optical properties of two dimensional materials." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:d794f6ee-8ea8-4c28-b199-6dbe28992e52.
Повний текст джерелаLu, Qiyang. "Controlling properties of functional oxides by tuning oxygen defect chemistry." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115715.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 164-192).
Oxygen defects are essential building blocks for properties and functionalities of oxides, including electrical conductivity, magnetism, ferroelectricity as well as catalytic and electrocatalytic activity. Therefore, fundamental understanding of how to tune the oxygen defect chemistry is essential for advancing applications based on these defect sensitive properties. This thesis investigated pathways to controlling the concentration and structure of oxygen defects on selected case studies with model oxide systems. Three novel effects were assessed and shown to be operative for obtaining a large impact on the oxygen defect chemistry equilibria. These are heterogeneous chemical doping of the surface for improving surface electrocatalytic activity and stability, electrochemical bias to control phase with drastic changes obtained in electronic and phonon transport properties, as well as strain engineering to alter the oxygen interstitial capacity and oxygen exchange kinetics. Surface chemical modifications were applied to the near-surface regions of Lao.8Sro.2CoO 3 (LSC) by replacing the Co cations locally with less reducible cations, such as Hf and Ti. This strategy was shown to effectively stabilize the LSC surfaces and suppress surface segregation of Sr at elevated temperatures. This introduced surface stability by local chemical doping greatly enhanced the long-term electrochemical performance of LSC electrode, which provides a new route for improving the efficiency of solid oxide fuel and electrolysis cells. Applying electrical bias was investigated as another effective method to tune the oxygen stoichiometry, exemplified by the case studies on SrCoOx (SCO). In situ X-ray diffraction was used to investigate the topotactic phase transition between brownmillerite phase SrCoO2.5 (BM-SCO) and perovskite phase SrCoO 3 6 (P-SCO) triggered electrochemically at elevated temperatures. An electrical bias of merely 30 mV was shown sufficient to trigger the BM-->P phase transition. This is much more feasible than chemically induced phase transition, which requires high pressure (> 1 bar) and specialized pressurized apparatus. Moreover, the evolution of electronic structure during the BM4P phase transition was probed in operando by using ambient-pressure X-ray photoelectron and absorption spectroscopy (AP-XPS/XAS). The similar experimental scheme, which combines in operando surface characterizations and electrochemical controlling of oxygen stoichiometry, was extended to oxide systems beyond perovskites. This allows us to investigate the defect chemistry of oxides in a much broader range of effective oxygen partial pressure than what conventional methods can achieve. Firstly, we showed that the surface defect chemistry equilibrium of fluoritestructured Pro.iCeo.902-6 (PCO) strongly deviated from the bulk counterpart, due to the possibly enhanced defect-defect interactions or lattice strain effect at surfaces. Secondly, we found a novel metal-insulator transition triggered electrochemically in VO, by changing the phase between the metallic dioxide VO2 and the insulating pentoxide V2O5 Lastly, we lowered the operation temperature of this electrochemical control of oxygen stoichiometry down to room temperature by using ionic liquid or ion gels as the electrolyte. We achieved tuning of thermal conductivity in SrCoOx with a range of more than one order of magnitude, by using electrochemically triggered phase transitions at room temperature. We also investigated the effect of lattice strain on oxygen defect formation energy in Ruddlesden-Popper (RP) phase oxide Nd2NiO4+6 (NNO). We found that tensile strain along the c-axis of NNO lattice effectively reduced the formation enthalpy of oxygen interstitials, which can provide a new route for designing the defect chemistry of RP phase oxide for electrocatalytic applications..
by Qiyang Lu.
Ph. D.
Malik, Surama. "Tuning of optical properties of InAs/GaAs self assembled quantum dots." Thesis, Imperial College London, 2003. http://hdl.handle.net/10044/1/7557.
Повний текст джерелаAbrahamsson, Maria. "Tuning of the Excited State Properties of Ruthenium(II)-Polypyridyl Complexes." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7230.
Повний текст джерелаSouza, de Almeida Jailton. "Designing and Tuning the Properties of Materials by Quantum Mechanical Calculations." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6923.
Повний текст джерелаKarakoti, Ajay. "Tuning the properties of nanomaterials as function of surface and environment." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4688.
Повний текст джерелаID: 028732931; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2010.; Includes bibliographical references.
Ph.D.
Doctorate
Department of Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
Motta, Cecilia Margarida Mendes. "Tuning surface properties to optimize cell behavior for tissue engineering applications." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1561654810655256.
Повний текст джерелаTarkuc, Simge. "Tuning The Optoelectronic Properties Of Conjugated Polymers Via Donor-acceptor-donor Architectures." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612103/index.pdf.
Повний текст джерела#960
-conjugated monomers was synthesized with combination of electron donating and electron-withdrawing heterocyclics to understand the effects of structural differences on electrochemical and optoelectronic properties of the resulting polymers. The use of this alternating donor-acceptor-donor strategy allows the synthesis of low band gap polymers in which the redox, electronic, and optical properties are controlled through easily approachable synthetic modification of the polymer backbone. This control allows fine-tuning of the band gap to values between 1.0 and 1.8 eV by making structural changes. These structural manipulations yield varied electronic absorption energies for a range of colors in the neutral polymer films, multi-colored electrochromism, and accessible states for reduction leading to n-type doping. The polymers prepared were characterized using cyclic voltammetry, colorimetry, and UV-Vis-NIR spectroscopy demonstrating that the polymers can undergo both p- and n-type doping and color changes in both redox states.
Östmark, Emma. "Tuning Properties of Surfaces and Nanoscopic Objects using Dendronization and Controlled Polymerizations." Doctoral thesis, KTH, Fiber- och polymerteknik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4550.
Повний текст джерелаQC 20100826
Huijben, Mark. "Interface engineering for oxide electronics: tuning electronic properties by atomically controlled growth." Enschede : University of Twente [Host], 2006. http://doc.utwente.nl/55832.
Повний текст джерелаFernando, Juwanmandadige Roshan. "Tuning the Opto-Electronic Properties of Core-Substituted Naphthalenediimides through Imide Substitution." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1401984667.
Повний текст джерелаGötz, Sebastian, Claas Wilke, Sebastian Cech, and Uwe Aßmann. "Architecture and Mechanisms of Energy Auto-Tuning." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-116748.
Повний текст джерелаGötz, Sebastian, Claas Wilke, Sebastian Cech, and Uwe Aßmann. "Architecture and Mechanisms of Energy Auto-Tuning." Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A26969.
Повний текст джерелаHenwood, Adam Francis. "Tuning the physical and optoelectronic properties of phosphorescent iridium(III) complexes : applications to organic semiconductor devices." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12976.
Повний текст джерелаAyers, William R. "Structural Properties and Compositional Processes in Microtonal Equal Temperaments." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin153570341690339.
Повний текст джерелаJiraporn, Sirison. "Studies on functional properties of soy lipophilic protein and its potential for food applications." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263363.
Повний текст джерелаBellacanzone, Christian. "Tuning of the poly(p-phenylenevinylene) derivativesemission properties by phase change materials andsonochemistry." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/664005.
Повний текст джерелаConjugated polymers (CP) are interesting materials with peculiar optoelectronic properties which make this class of polymers good candidate for several applications such as OLEDs, organic photovoltaics, but also for bioimaging and drug delivery. In the last decades, increasing attention has been directed to the tuning of the emission properties of CP to fully exploited their application in several fields. The aim of this thesis work is to achieve a fine emission tuning of a polyphenylene vinylene (PPV) derivatives. Two main strategies have been adopted. I) Nanoparticles of PPV oligomers with different conjugation length was obtained through sonochemical synthesis. Ultrasound irradiation of PPV polymer heterogenous solution was employed to induce the activation of radical species which cut the polymer chain forming PPV oligomers. The copresence of surfactant leads to a simultaneous nanostructuration of such oligomers producing water-soluble nanoparticles which exhibited a progressive hypsochromic shift of absorption/emission compared to the parental polymer. These nanoparticles that emitted in a wide range of the visible electromagnetic spectrum are promising materials for application such as polymers LEDs and bioimaging. II) The PPV polymers and oligomers were mixed with phase change materials with different melting point. Upon heating, solid-to-liquid phase transition is induced in the PCM/PPV system and its fluorescence is blue shifted. Once the system is cooled down the initial emission is recovered. Such system could be applied as multicolour emitting temperature sensor, or for thermoregulated white organic light emitting diode, thanks to the red, green and blue emission of the PPV derivatives obtained in this work.
Algarni, Zaina Sluman. "Exploring Growth Kinematics and Tuning Optical and Electronic Properties of Indium Antimonide Nanowires." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404545/.
Повний текст джерелаGohlke, David Christopher. "Tuning the Properties and Interactions of Manganese Acceptors in Gallium Arsenide with STM." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354669837.
Повний текст джерелаLeach, Jacob H. "Tuning of electrical properties in InAlN/GaN HFETs and Ba0.5Sr0.5TiO3/YIG Phase Shifters." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2035.
Повний текст джерелаMiller, Mark Thomas. "Tuning the properties of copper(I) and nickel(II) through heterocyclic ligand design /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9944217.
Повний текст джерелаGao, Jie. "Tuning the chiroptical properties of Goldhelices through their nanostructure optimization and hierarchical organization." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0138/document.
Повний текст джерелаChiral materials can have strong influence on the propagation of light and have attracted attention in the nano-science community. Gold nanoparticles (GNPs), stable plasmonic materials in the visible range (400-800 nm), are attractive objects as building blocks for optical materials. We have designed and obtained Goldhelices by grafting GNPs on silica nano-helical structures. The work presented in this thesis aims at developing tunable Goldhelices and organizing them in order to enhance, modify, reduce or even eliminate the chiroptical properties. The details of the nanostructures as well as the kinetics of formation of organic self-assembly which is used as templates for the formation of Goldhelices are fully studied. The hierarchical organization of the Goldhelices is investigated by the use of three techniques, the microfluidics, the dip-coating and the grazing incident spraying. Finally, the effect of the organization on their optical properties are characterized by chiral spectroscopies and Mueller matrix polarization ellipsometry. We demonstrate that such a system can be used for the creation of linear or circular polarizer where such polarization is solely tunable by the organization of the Goldhelices
Götz, Sebastian. "Multi-Quality Auto-Tuning by Contract Negotiation." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-119938.
Повний текст джерелаHäring, Felix [Verfasser]. "Tuning the magnetic properties of thin films by interaction with periodic nanostructures / Felix Häring." Ulm : Universität Ulm. Fakultät für Naturwissenschaften, 2014. http://d-nb.info/1053705670/34.
Повний текст джерелаBarzegar, HamidReza. "Synthesis and Characterization of Carbon Based One-Dimensional Structures : Tuning Physical and Chemical Properties." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-97551.
Повний текст джерелаAshcraft, James Nathan. "Tuning the transport properties of layer-by-layer thin films for fuel cell applications." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54207.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 138-148).
The increasing global focus on alternative energy sources has led to a renewed interest in fuel cells. For low power, portable applications, direct methanol fuel cells (DMFCs) are the most promising type of fuel cell. DMFCs can operate at ambient conditions and only require dilute methanol solutions and air to be input to the devices. At the core of these devices is a proton exchange membrane (PEM) that allows rapid proton transport through the polymer matrix while preventing fuel from permeating across. Additionally, PEMs must have long-term stability in the fuel cell environment, the ability to operate over a wide range of conditions (temperature and humidity), and be cost effective. A promising, robust method for fabricating polymer films with tunable properties is layer-by-layer (LbL) assembly. This technique consists of building a polymer film by sequential dipping into polymer solutions with complementary interactions, such as opposite electrostatic charges. The LbL method allows the formation of thin films that have perm-selective properties and high ionic conductivity values. This work describes the optimization of multilayer systems for use as the PEM in DMFCs. First, LbL assembled films of poly[bis(methoxyethoxyethoxy)-phosphazene] (MEEP) and poly (acrylic acid) (PAA) are demonstrated by utilizing the hydrogen bonding between these two polymers. These films show controlled thickness growth, high ionic conductivity, and excellent hydrolytic stability. The ionic conductivity of these films is optimized by tuning the assembly pH of initial polymer solutions and thereby controlling the hydrogen bonding characteristics.
(cont.) Despite similar film composition, MEEP/PAA LbL films assembled at higher pH values have enhanced water uptake and transport properties, which play a key role in increasing ion transport within the films. At fully humidified conditions, the ionic conductivity of MEEP/PAA is over one order of magnitude higher than previously studied hydrogen bonded LbL systems. The next LbL systems studied consist of a highly sulfonated aromatic polyether (sPPO) paired with amine containing polycations. The best performing sPPO system has ionic conductivity values which are the same order of magnitude as commercially relevant PEMs and has the highest ionic conductivity ever obtained from a LbL assembled film. Additionally, these LbL systems have methanol permeability values over two orders of magnitude lower than traditional PEMs. Incorporating the sPPO systems into DMFCs results in a 53% improvement in power output as compared with DMFCs using traditional PEMs. In-depth structure property studies are performed to understand the nature of the high ionic conductivity of the sPPO LbL systems with respect to film growth, composition, water uptake, and ionic crosslink density. Lastly, the mechanical properties of highly conducting LbL films are improved by forming the LbL matrix on highly tunable electrospun fiber mat (EFM) supports. Free-standing LbL films have moderate mechanical properties when dry, but are mechanically deficient when hydrated. Coating an EFM with the LbL dipping process produces composite membranes with interesting "bridged" morphologies, while still maintaining high ionic conductivity values.
(cont.) The spray LbL assembly is studied as a means for the rapid formation of LbL films on EFMs. At optimized conditions, the LbL materials conformally coat the individual fibers throughout the bulk of the EFM and have uniform surface coatings. The mechanical properties of the spray coated EMFs are shown to be superior to the pristine LbL systems.
by James Nathan Ashcraft.
Ph.D.
Mitton, Renata. "Tuning the Physical Properties of Poly(arylene ether)s Prepared from 3,5-Difluorobenzene Sulfonamides." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1436957462.
Повний текст джерелаZhu, Tiancong. "Tuning the Spin Transport and Magnetic Properties of 2D Materials at the Atomic Scale." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563385375225464.
Повний текст джерелаLoibl, Antonia [Verfasser]. "Pyridyl-substituted Phosphinines and Pyridines: Tuning Ligand Properties for Applications in Catalysis / Antonia Loibl." Berlin : Freie Universität Berlin, 2018. http://d-nb.info/115188135X/34.
Повний текст джерелаSaha, Arpita. "Tuning the properties of quantum nanocrystals and magnetic nanoparticles using spherical ligands: carboranes and metallacarboranes." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/667956.
Повний текст джерелаThe research presented in this thesis has been summarized as a compendium of articles published and to be published in the future. There are five chapters dealing with the results and discussions. The results and discussions are preceded by a general introduction and objectives. The summary of each chaper of the results is given below. The 1st chapter deals with aqueous quantum dots (QDs) capped with meta-carboranyl phosphinate which gives us a brand new architecture of QDs named as core-canopy QDs. This is the first time spherical ligands have been experimentally used to cap QDs. Due to this architecture, we obtained a new luminescence property in these QDs, called the kinetic fluorescence switching (KFS) which has never been reported before. It is a new phenomenon in which the luminescence fades with time but upon application of kinetic energy regains the full intensity of emission. These core-canopy QDs can trap anions and act like capacitors, they are compared with other QDs and characterized. The next chapter deals with synthesis of QDs in water using a new set up developed by us. It produces QDs with high PL, QY and longer lifetime of emission in water medium. The set up used is different to the reflux based method used to synthesize QDs in water at 100oC. Here we used a cork insulated sand bath, with ace pressure tubes of glass. The QDs are generated in these pressure tubes at 150oC under autogeneous pressure produced by the tubes. They have been compared to the traditional water based QDs and charaterized. These QDs combine the advanatge of high QY and different luminescence colours of organometallic synthesized QDs and the easy and cheap production of a water based synthesis. The next chapter deals with quantum nanocrystals (QNCs) being synthesized in water for the first time. We have demonstrated an easy synthetic route and setup design using which quantum rods (Qrods) and quantum rings (QRs) can be easily synthesized in a water medium. This is the first time that this has been experimentally synthesized and studied. These QNCs could be easily stored in powdered form, remain suspended in various solvents for more than 18 months, without degradation in their colloidal stability or luminescence properties. Moreover, they can be used to form nancomposites using polymers. These polymeric films containing the QNCs showed luminescence which lasted over a year and could also show electroluminescence, hence making them viable for QLED applications in the future. The 4th chapter of the results and discussions deals with magnetic nanoparticles (MNPs) coated with meta-carboranyl phosphinate. These give rise to new nano-hybrids which can be used for biological application of boron neutron capture therapy (BNCT). These nanohybrids have been synthesized, characterized and used in biological applications. Their magnetic properties and stability has been studied after autoclave sterilization, further their colloidal stability in different biological culture mediums has also been studied. Then their cellular uptake has been studied and quantified. The uptake of the MNPs by the glioblastoma tumor cells has been visualized and also studied in vivo for BNCT applications. Finally, the last chapter deals with the synthesis of MNPs and coating with inorganic silica shell. These coated MNPs are further functionalzied with amino and carboxylic groups for them to be attached with antibodies for biosensing applications. MWCNTs are also used in conjugation with these MNPs to generate magnetic nanocomposites (MNCs). Both the MNPs and MNCs are used to generate for the first time a non-bonded complex with H[COSAN]. H[COSAN] being a redox specie can be used to manipulate the HOMO-LUMO levels, thus enabling these MNPs and MNCs as effective sensing layer materials.
Ngo, Thien-An. "Tuning the electronic properties of conjugated polyelectrolytes via complexation with lipid vesicles or silica nanobeads." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97001.
Повний текст джерелаLes polymères conjugués (PC) ont une fluorescence amplifiée mais facilement supprimée, ce qui les rend utile pour la détection d'une vaste gamme de molécules. Ici on a crée des nouvelles structures luminescents basées sur les interactions entre la PC (poly[5-methoxy-2-(3-sulfopropoxy)-1,4-phenylenevinylene (MPS-PPV) et des liposomes ou des particules de silice de diamètre environ 100 nm. L'interaction entre la PC et les lipides est vérifié avec la spectroscopie. Ajoutant une autre fluorophore aux lipides, on voit fluorescence resonance energy transfer (FRET) de la PC au fluorophore. L'encapsulation de la PC est vérifié par la réponse de la fluorescence des complexes PC / lipide au méthyle viologène, et la conjugaison spécifique des complexes contenant des lipides biotinylées aux surfaces couvert de streptavidin. Le cation divalent de calcium a été utilisé pour modifier les interactions lipide-PC, ce qui était indiquée par FRET. En outre, MPS-PPV a été adsorbée sur les particules de silice via des interactions électrostatiques. Les effets de l'adsorption sur les caractéristiques photophysiques des complexes MPS-PPV / silice ont été étudiés avec la spectroscopie et la microscopie de fluorescence par réflexion totale interne (TIRFM). Leur réponse au méthyle viologène est aussi amplifiée que celui du polymère libre, mais leur luminescence résiste les effets des interactions hydrophobiques. Cette recherche donne des nouveaux aperçus sur la modification de la fluorescence amplifiée des PC, vers continuer le développement des systèmes utilisant des polyvinyles de para-phénylène pour la détection luminescent biologique et chimique.
Brulatti, Pierpaolo. "New luminescent iridium (III) complexes containing NCN cyclometallated ligands : synthesis, photophysical properties and emission tuning." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/447/.
Повний текст джерелаBoi, Filippo. "Ferromagnetically filled carbon nanotubes : radial structures and tuning of magnetic properties through new synthesis methods." Thesis, Queen Mary, University of London, 2013. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8734.
Повний текст джерелаGuo, Wenting. "Tuning the properties of high-Tc superconductor & Sr2IrO4, and exploring transport through single nanocrystals." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289764.
Повний текст джерелаPersi, Erez. "Contrast and tuning response properties of neurons in the visual cortex : modeling and data analysis." Paris 6, 2008. http://www.theses.fr/2008PA066216.
Повний текст джерелаAfin d’étudier les bases du codage de l’orientation et du contraste par les neurones du cortex visuel primaire (V1), nous avons utilisé une approche à la fois théorique et expérimentale. Nous analysons dans un premier temps et de façon théorique, comment l’activité émergente dans V1 dépend des propriétés d’entrée des neurones corticaux, de leur fonction de transfert « entrée-sortie » et des différents patrons de connectivité à l’intérieur de cette même structure. Nous nous penchons ensuite sur les différentes sources d’entrées d’un modèle d’hyper-colonne, en caractérisant les conditions qui permettent à la fois une sélectivité à l’orientation indépendante du contraste et une fonction de réponse au contraste (CRF) sigmoïde. De plus, nous soulignons le rôle des relations entre les propriétés intrinsèques des neurones et les propriétés du réseau. Plus précisément, nous montrons que les non-linéarités dans la fonction de transfert « entrée-sortie », caractérisées par une loi de puissance, entraînent l’étrécissement à la fois de la courbe de sélectivité à l’orientation et de la CRF dans V1. La saturation de la CRF résulte, elle, d’une inhibition corticale à fort contraste, ce qui est aisément réalisé avec des fonctions de transfert basées sur des lois de puissance. Dans un deuxième temps, nous analysons des données expérimentales provenant à la fois d’enregistrements in vitro et in vivo et montrons que les hypothèses clés de notre modèle sont en accord avec les comportements neuronaux. Un point central de notre étude est d’expliquer la diversité des paramètres de la CRF. Nous montrons que le modèle justifie cette diversité par l’hétérogénéité des propriétés du neurone lui-même ou de ses afférences thalamiques. De plus, les données expérimentales indiquent qu’il y a une contribution à part égale des deux types d’hétérogénéités. Les principes présentés ici sont valables pour d’autres aires visuelles et peuvent être appliqué d’autres mécanismes du traitement de l’information visuelle
Luo, Wen. "Tuning the redox properties of cobalt particles supported on oxides by an In-between graphene layer." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF007/document.
Повний текст джерелаThe metal-support interaction (MSI) plays an important role in heterogeneous catalysis. Understanding and tuning the MSI are essential steps for developing catalysts with high performance. In this thesis, a new concept, which is coating the oxide supports with a single layer graphene, was introduced to modify the MSI. The influence of graphene layer on the metal (Co and Co-Pt) – oxide (ZnO and SiO2) interactions and on the redox properties of metal particles were evaluated through model catalyst systems. The results showed that single layer graphene can significantly influence the oxidation states and morphologies of both mono Co and bimetallic Co-Pt as compared to the one after direct deposition on bare oxides. In particular, under vacuum annealing, graphene protects Co from being oxidized by ZnO and results in Co-Pt metallic mixture. Co interacts with oxide substrates forming flat particles which are easily oxidized by low pressure O2, while insertion of a graphene interlayer between the metal overlayer and the oxide supports leads to the formation of highly dispersed Co nanoparticles, which are resistant to oxidation. Under H2 reduction condition, graphene evidently facilitates the reduction of Co. The deposition amount of Co, the oxide substrate, the annealing temperature and the environment were proved to influence the stability of graphene. These results explore new directions for the possible future of using graphene as a promoter in catalytic reactions
Kittikorn, Thorsak. "Tuning the long-term properties to control biodegradation by surface modifications of agricultural fibres in biocomposites." Doctoral thesis, KTH, Träkemi och massateknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119915.
Повний текст джерелаQC 20130325
Egan, Lindsay. "Tuning the magnetic properties of Prussian Blue analogues : size control and the effects of external stimuli." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3850.
Повний текст джерелаThill, Alisson Steffli. "Tuning the electronic and structural properties of cerium oxide nanoparticles for the H2 production photocatalytic reaction." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/185814.
Повний текст джерелаEtheridge, Forrest Samuel. "Tuning the Opto-Electronic Properties of Organic Semiconductors: Derivatives ofAzadipyrromethene, Naphthalene Diimide and Poly(3-hexylthiophene)." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1459352863.
Повний текст джерелаJung, Alexandra. "Tuning the structural and magnetic properties of Sr2FeReO6 by substituting Fe and Re with valence invariant metals /." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=98039189X.
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