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Showing 1 to 20 of 34 for “"Polyanion"”.
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Borate polyanion-based systems as Li- and Mg-ion cathode materials
… (M2B2O5) are an unexplored family of borate polyanions, which offer higher theoretical capacities and voltages than LiMBO3 due to their more condensed frameworks. There are no known Li containing pyroborates, we use electrochemical ion exchange, with the aim of replacing each Mg with 2 Li to …
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Advanced Materials for High-Energy Rechargeable Batteries: Borate Polyanion Cathodes and Silicon Anodes
… part presents a comprehensive study on borate polyanions as potential cathode materials for RMBs. Three structural families were systematically explored: orthoborates (M₃(BO₃)₂), pyroborates (M₂B₂O₅), and ludwigites (M₃BO₅). In Chapter 3, a detailed overview of the solid-state synthesis …
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Polycation-polyanion complexes : preparation and properties of poly(vinylbenzyl-trimethyl ammonium)-poly(styrene sulfonate)
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1961.
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Characterization of a platinum-substituted keggin anion and studies of robust, hydrogen-bonded polyanion aggregates
… of platinotungstate and platinomolybdate heteropolyanions were carried out. Salts of the Keggin-type -SiPtW11O406- anion (1) were prepared through the reaction of K8SiW11O39.13H2O with K2Pt(OH)6 and acidification of the reaction solution to pH 4 with HNO3. Infrared spectra indicated …
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Polyanionizing rocksalt cathodes for lithium-ion batteries
Rocksalt-type and olivine polyanion-type cathodes are the two most dominant families of practical lithium-ion battery (LIB) cathodes. Rocksalt-type cathodes, including layered LiCoO₂, [chemical formula] (NCM), spinel LiMn₂O₄ and [chemical formula], and the later-developed disordered rocksalt …
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High-nickel layered oxide cathodes for high-performance lithium-ion batteries
… improved by Mg doping. Second, boron-based polyanion is employed to tune high-Ni cathodes. The introduction of boron-based polyanion enables a well-passivated boron/phosphorus-rich cathode-electrolyte interphase, which alleviates electrolyte corrosion on high-Ni cathodes and thus improves …
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Studying and controlling chromophore orientation in polyelectrolyte layer-by-layer thin films
… to assembly films. For example, a polyanion and polycation are dissolved in separate aqueous solutions at a given pH and salt concentration. A charged substrate is immersed into one solution, rinsed with water, and immersed in the other solution. This cycle is repeated to assemble …
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Immobilization of Ru(bpy)(3)(2+) for Electrogenerated Chemiluminescent Sensors and Application of Interdigitated Array Electrodes in Transmission Ft-Ir Spectroscopy
… a complex role for water in mediating the polyanion-cation interactions.
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Polyoxometalate self-assembly : from molecules to framework materials
… (TMSPs), with particular emphasis on polyanions based on the Keggin structure and lacunary derivatives thereof. In particular, an understanding is gained into the role that N,N’-bis(2-hydroxyethyl)piperazine (bhep) and morpholine (morph) play in the polyanion self-assembly process, …
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Sterically Crowded Copolymers Based on Functionalized Stilbenes
… solution characterization of stilbene containing polyanions, a 2-step dissociation behavior was observed for the two adjacent carboxylic acids in maleic acid containing polyanions. Stilbene polyanion solutions showed high Rh values in deionized water as shown by DLS measurements and a decrease of …
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Nonlinear Optical Properties and Structural Characteristics of Ionically Self-Assembled Nanoscale Polymer Films Influenced by Ionic Concentration and Incorporation of Monomer Chromophores
… of the chromophores within the bulk of each polyanion layer. A reduction in film thickness accompanied by an increase in net polar ordering is one possible avenue to obtain the second-order nonlinear optical susceptibility chi(2) necessary for electro-optic devices. In this thesis, we will …
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Second-Order Nonlinear Optical Characteristics of Nanoscale Self-Assembled Multilayer Organic Films
… films fabricated with a nonlinear optical (NLO) polyanion result in significant cancellation of the chromophore orientations. This cancellation occurs by two mechanisms: competitive orientation due to the ionic bonding of the polymer chromophore with the subsequent polycation layer, and random …
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Improving blood compatibility of surfaces using tanfloc and carboxymethyl-kappa-carrageenan polyelectrolyte multilayers
… antimicrobial polymer, as both a polycation and polyanion. These PEMs showed strong antibacterial activity and excellent biocompatibility, providing a foundation for multifunctional coatings. The second aim investigates the hemocompatibility of TAN and carboxymethyl-kappa-carrageenan (CMKC) PEMs …
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Next generation of electrospun textiles for chemical and biological protection and air filtration
… chemical and biological protection. Reactive polyanion, polyhydroxamic acid, which can decompose OP nerve agents, and antimicrobial polycation, poly (N-vinylguanidine), were synthesized and LbL-assembled onto electrospun fibers to achieve multifunctional coatings. The capability of these …
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Development, Characterization, and Fundamental Studies on Molecular Ionic Composites and PBDT Hydrogels
… for batteries. MICs form when mixing a rigid polyanion with purely ionic fluids, and they behave mechanically as a solid but contain a high density of ions that move nearly as in a neat liquid. Specifically, prototypical MICs are based on solutions of the rigid-rod polyelectrolyte …
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Design Of A Polysaccharide Derived Tissue Engineered Vascular Graft
… of glycosaminoglycans (GAG) and a GAG-like polyanion as modifiers of smooth muscle and endothelial cells activity. We also investigated various scaffold formulations and seeding techniques for enhanced cellular entrapment and high cell proliferation. In-vitro, 3D scaffold cultures under …
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Thiocyanatometallate(I) des Kupfers und Silbers : Präparationen und strukturelle Charakterisierung
… So wird bei K[Ag(SCN)2] ein schichtfoermiges Polyanion aus eckenverknuepften Doppeltetraedern, bei (CH3)3NH[Ag(SCN)2] aber ein kettenfoermiges Anion [Ag(SCN)2]- gefunden. Bei den entsprechenden Verbindungen (CH3)4N[Ag(SCN)2] und (CH3)4N[Cu(SCN)2] werden Tetraederketten ueber end-to-end …
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Mechanistic Investigation into the Regulation of Amyloid Motifs in Tau Aggregation and Disease
… of an inducer such as heparin, RNA or other polyanion will tau aggregate in vitro. Our studies use disease-causing mutations as a bridge to explain the basis of early conformational changes that may underlie genetic and sporadic tau pathogenesis. Our findings provide molecular insights into …
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Self-assembled thin films with tunable release kinetics for biomedical applications
… a naturally-derived, hydrolytically-degradable polyanion, poly(P-L-malic acid) (PMLA), for use in LbL films to control the rate of film erosion and hence protein elution which was tuned from minutes to weeks depending on the film's architecture. We further adapted the film architecture with …
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Characterization of Phagosome-Lysosome Fusion in Macrophages
… inhibited by several days of culture in various polyanionic compounds such as dextran sulfate (DS), which were endocytosed and concentrated in secondary lysosomes. Polyanions did not inhibit pinosome-lysosome fusion, as assayed by the intracellular degradation of a pinocytic marker, by electron …
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