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Showing 1 to 20 of 273 for “"acceptors"”.
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Alternation and Omega-Type Turing Acceptors
… classes of (omega)-languages accepted by Turing Acceptors when infinite computations are allowed. There are various possible "natural" acceptance conditions to consider, including those already common in the literature of (omega)-automata. There are also the deterministic (D), nondeterministic …
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Spectroscopic Studies of Organic Photovoltaic Non-Fullerene Acceptors
… organic materials called ‘non-fullerene acceptors’ (NFAs). They have become well-established as a component in the bulk heterojunction active layer of organic photovoltaic (OPV) cells, and are credited with facilitating a rapid increase in the power conversion efficiencies of these …
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Two-dimensional modeling of in situ bioremediation using sequential electron acceptors
… has shown that the use of sequential electron acceptors significantly impacts biodegradation results. Aquifer conditions may switch between primary and secondary electron accepting conditions, further complicating the modeling process. This research examines the two-dimensional, sequential …
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Synthesis and Characterization of Molecule-Based Magnets Containing Methyl-Substituted Phenyltricyanoethylene Acceptors
… utilizing new reversible one-electron acceptors with the general form MexPTCE (PTCE = phenyltricyanoethylene, x is the number of methyl groups on the phenyl ring, Me = -CH3). These new acceptors were synthesized for the purpose of studying electronic and steric effects of the …
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Ultrafast Spectroscopy of Organic Semiconductors: Singlet Fission and Nonfullerene Acceptors for Organic Photovoltaics
… embodies an exodus from the fullerene electron acceptors prominent in organic solar cells. Indeed, this versatile class of tunable small molecules are aptly termed nonfullerene acceptors. However, both strategies would benefit from a greater understanding of underlying principles. Singlet …
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Singlet Fission Organic Solar Cell with Long-Wavelength Absorption Using Non-fullerene Acceptors
Organic solar cells made with singlet exciton fission materials are able to convert a single photon into two charges. Paired with a long-wavelength absorbing acceptor material, singlet fission materials enable solar cells that exhibit the quantum efficiency benefits of a multi-junction solar cell, …
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Studies and Optimization of All-Polymer Solar Cells based on Naphthalene Diimide-Biselenophene Copolymer Acceptors
… on naphthalene diimide-biselenophene copolymer acceptors and aims to better understand the relationship between photovoltaic properties, blend morphology, and device processing variables. In this study, we found that optimal thermal annealing and use of a processing additive facilitated …
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Three-Dimensional Modeling of Solute Transport with In Situ Bioremediation Based on Sequential Electron Acceptors
… donors for microbial growth, with electron acceptors utilized in the following sequence: oxygen, nitrate, Mn(IV), Fe(III), sulfate, and CO₂. In addition, the model accounts for products of biodegradation such as Mn (II), Fe(II), H₂S, and CH₄. Biodegradation of each hydrocarbon substrate …
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Influence of Petroleum Deposit Geometry on Local Gradient of Electron Acceptors and Microbial Catabolic Potential
… geometry on localized gradients of electron acceptors and microbial community composition, factors that are critical to accurately estimating biodegradation rates. One-dimensional top-flow sand columns with 12-hour simulated tidal cycles compared two contrasting geometries (isolated tar …
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Synthesis of fluoromodified carbon rich electron acceptors and exploration of their structural, electronic, and device properties
The electronic and structural characterization of fluoro-modified carbon-rich compounds is critical to the successful implementation of these materials by physicists, biochemists, materials scientists, medicinal chemists, and most significantly for this work, organic electronics chemists. By adding …
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Determination of the relative stereochemistry of adducts resulting from the addition lithium dienolates to Michael acceptors
The addition of the lithium dienolate of ethyl crotonate to 2-cyclopentenone was studied to determine the stereochemical outcome of this Michael addition. Proof of the stereochemistry was provided via the unambiguous synthesis and comparison of ketone 73 from norcamphor 85.
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The effect of alternative electron acceptors on the subsurface biodegradation rates of methanol and tertiary-butyl alcohol
… of nitrate and sulfate (alternative electron acceptors) on the biodegradation of the alcohols in the absence of molecular oxygen. This study also evaluated the effect of adding hydroxide and bicarbonate to the groundwater as buffering agents in an attempt to raise the pH of the groundwater and …
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Studying the properties of conjugated donor acceptor complexes with naphthaleneimide acceptors and dialkoxybenzene donors linked by a triple bond
… similar in structure to the naphthalenediimide acceptors and dialkoxynaphthalene donors that have been extensively studied by the Iverson research group, but these new complexes are designed to have a large molecular dipole. The molecular dipole allows the molecule to switch stacking …
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Investigation of a model FRET system with multiple donors and acceptors. Allowing validation of data interpretation for studies of cells
In this study the foundations are laid for using a fluorescence microscopy system to view multiple fluorescent species in mammalian cells as a possible technique in investigating the oligomers status of GPCRs. The system utilises spectrally resolved intensity, anisotropy and lifetime measurements. …
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Generation-Annealing of Interface Traps and Hydrogenation of Boron Acceptors in Metal-Oxide-Silicon Capacitors Irradiated by Kilo-Volt Electrons
… of interface traps and deactivation of boron acceptors in silicon are investigated in Al/SiO$\sb2$/Si capacitors exposed to 8 keV electrons. Post-oxidation conditions are varied. Interface and oxide traps are separated using a repeated stress-anneal technique with the time-dependent …
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Building model systems to understand Proton-Coupled Electron Transfer in heme : spectroscopic investigation of charge transfer to axially bound diimide acceptors
… understand the signatures of different electron acceptors and binding to the metal center, a redox inactive zinc porphyrin is used as a model to allow for longer excited state lifetimes and well known transient signatures. Three diimide acceptors have been coordinated through a pyridine ring to …
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Correlation of Structure and Magnetic Properties in Charge-Transfer Salt Molecular Magnets Composed of Decamethylmetallocene Electron Donors and Organic Electron Acceptors
… (DiPrDCF) have been used as one-electron acceptors in the synthesis of charge-transfer salt magnets with decamethylmetallocenes, MCp*2 (M = Mn, Cr). Salts of each acceptor with each metallocene have been characterized and the structures of the chromium analogues have been solved. The two …
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Synthesis of New Molecule-Based Magnets using Bridging Organic Radicals
Several new families of organic acceptors that are candidates as building blocks of molecule-based ferrimagnets were synthesized and characterized. These families include fluorodicyanostilbenes, a tetrachlorodicyanostilbene, naphthyltricyanoethylenes, bromophenyltricyanoethylenes, and an …
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Synthetic Approaches to Organaylselenium and Tellurium Semi-Conductors
… compounds were used as donors with some electron acceptors to form donor-acceptor complexes. 7,7,8,8-Tetracyano-p-quinodimethane (TCNQ), Chloranil (TCQ) and pdinitrobenzene (DNB) were chosen as acceptors. Solid state conductivity measurements have been employed for the charge-transfer complexes...
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A common and previously unknown ecological niche: the halorespiration of natural organochlorines in terrestrial soil and sediment
… and trichloroethene, as their terminal electron acceptors and are called halorespirers. While the distribution and role of halorespiring <italic>Chloroflexi</italic>, as well as halorespirers in other phyla such as the <italic>Firmicutes</italic>, have been relatively well characterized in …
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