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Letteratura scientifica selezionata sul tema "Ion multivalent"

Autore: Grafiati

Pubblicato: 9 novembre 2024

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Articoli di riviste sul tema "Ion multivalent"

Iton, Zachery W. B., e Kimberly A. See. "Multivalent Ion Conduction in Inorganic Solids". Chemistry of Materials 34, n. 3 (27 gennaio 2022): 881–98. http://dx.doi.org/10.1021/acs.chemmater.1c04178.

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Proffit, Danielle L., Albert L. Lipson, Baofei Pan, Sang-Don Han, Timothy T. Fister, Zhenxing Feng, Brian J. Ingram, Anthony K. Burrell e John T. Vaughey. "Reducing Side Reactions Using PF6-based Electrolytes in Multivalent Hybrid Cells". MRS Proceedings 1773 (2015): 27–32. http://dx.doi.org/10.1557/opl.2015.590.

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ABSTRACTThe need for higher energy density batteries has spawned recent renewed interest in alternatives to lithium ion batteries, including multivalent chemistries that theoretically can provide twice the volumetric capacity if two electrons can be transferred per intercalating ion. Initial investigations of these chemistries have been limited to date by the lack of understanding of the compatibility between intercalation electrode materials, electrolytes, and current collectors. This work describes the utilization of hybrid cells to evaluate multivalent cathodes, consisting of high surface area carbon anodes and multivalent nonaqueous electrolytes that are compatible with oxide intercalation electrodes. In particular, electrolyte and current collector compatibility was investigated, and it was found that the carbon and active material play an important role in determining the compatibility of PF6-based multivalent electrolytes with carbon-based current collectors. Through the exploration of electrolytes that are compatible with the cathode, new cell chemistries and configurations can be developed, including a magnesium-ion battery with two intercalation host electrodes, which may expand the known Mg-based systems beyond the present state of the art sulfide-based cathodes with organohalide-magnesium based electrolytes.

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Rutt, Ann, e Kristin A. Persson. "Expanding the Materials Search Space for Multivalent Cathodes". ECS Meeting Abstracts MA2022-02, n. 4 (9 ottobre 2022): 446. http://dx.doi.org/10.1149/ma2022-024446mtgabs.

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Multivalent batteries are an energy storage technology with the potential to surpass lithium-ion batteries, however their performance has been limited by the low voltages and poor solid-state ionic mobility of available cathodes. A computational screening approach to identify high-performance multivalent intercalation cathodes among materials that do not contain the working ion of interest has been developed which greatly expands the search space that can be considered for materials discovery. This approach has been applied to magnesium cathodes as a proof of concept and resulting candidate materials are discussed in further detail. In examining the ion migration environment and associated Mg2+ migration energy in these materials, local energy maxima are found to correspond with pathway positions where Mg2+ passes through a plane of anion atoms. While previous works have established the influence of local coordination on multivalent ion mobility, these results suggest that considering both the type of local bonding environment as well as available free volume for the mobile ion along its migration pathway can be significant for improving solid-state mobility.

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Dong, Liubing, Wang Yang, Wu Yang, Yang Li, Wenjian Wu e Guoxiu Wang. "Multivalent metal ion hybrid capacitors: a review with a focus on zinc-ion hybrid capacitors". Journal of Materials Chemistry A 7, n. 23 (2019): 13810–32. http://dx.doi.org/10.1039/c9ta02678a.

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Schauser, Nicole S., Ram Seshadri e Rachel A. Segalman. "Multivalent ion conduction in solid polymer systems". Molecular Systems Design & Engineering 4, n. 2 (2019): 263–79. http://dx.doi.org/10.1039/c8me00096d.

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Hasnat, Abul, e Vinay A. Juvekar. "Dynamics of ion-exchange involving multivalent cations". Chemical Engineering Science 52, n. 14 (luglio 1997): 2439–42. http://dx.doi.org/10.1016/s0009-2509(97)00047-x.

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KC, Bilash, Jinglong Guo, Robert Klie, D. Bruce Buchholz, Guennadi Evmenenko, Jae Jin Kim, Timothy Fister e Brian Ingram. "TEM Analysis of Multivalent Ion Battery Cathode". Microscopy and Microanalysis 26, S2 (30 luglio 2020): 3170–72. http://dx.doi.org/10.1017/s1431927620024058.

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Imanaka, Nobuhito, e Shinji Tamura. "Development of Multivalent Ion Conducting Solid Electrolytes". Bulletin of the Chemical Society of Japan 84, n. 4 (15 aprile 2011): 353–62. http://dx.doi.org/10.1246/bcsj.20100178.

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Li, Zhong-Qiu, Yang Wang, Zeng-Qiang Wu, Ming-Yang Wu e Xing-Hua Xia. "Bioinspired Multivalent Ion Responsive Nanopore with Ultrahigh Ion Current Rectification". Journal of Physical Chemistry C 123, n. 22 (13 maggio 2019): 13687–92. http://dx.doi.org/10.1021/acs.jpcc.9b02279.

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Gates, Leslie, e Niya Sa. "Investigation of Suitability of Electrolytes in a Trivalent System". ECS Meeting Abstracts MA2023-01, n. 1 (28 agosto 2023): 425. http://dx.doi.org/10.1149/ma2023-011425mtgabs.

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As lithium-ion batteries (LIB) start to approach their theoretical limit, researchers are focusing on alternatives such as nonaqueous multivalent systems. There are many advantages of multivalent systems such as higher natural abundance, low cost and possible high volumetric capacity. Suitable electrolytes are vital for the development of such multivalent battery systems which offer compatibility of utilizing metal anode. To create a better understanding of the opportunities and challenges of the trivalent electrolytes in aluminum batteries, this work investigates the reaction mechanisms and SEI interactions at the electrolyte/electrode interface.

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Più fonti

Tesi sul tema "Ion multivalent"

Keyzer, Evan. "Development of electrolyte salts for multivalent ion batteries". Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/288431.

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This dissertation focuses on the synthesis and electrochemical testing of new electrolyte salts for rechargeable multivalent ion batteries. In chapters 2 and 3 the synthesis of Mg and Ca hexafluoropnictogenate salts as well as the electrochemical behaviour of Mg(PF6)2 is presented. Pure samples of Mg(EF6)2 (E = P, As, and Sb) can be synthesized using Mg metal and NOPF6/NOSbF6 in CH3CN or via a ammonium salt deprotonation route using Me3NHAsF6 and Bu2Mg. The NOPF6 method was extended to the Ca variant, but isolation of a pure Ca(PF6)2 material required the presence of a crown ether. Electrochemical and microscopy measurements of THF-CH3CN solutions of Mg(PF6)2 show that the electrolyte good electrochemical stability and can facilitate the plating/stripping of Mg. Further, this electrolyte system can be cycled in a full cell using the Chevrel phase Mo6S8 cathode. The electrochemical stability of the AsF6− and SbF6− salts is lower than that of the PF6− salt and electrolyte decomposition is observed when cycling on Mg electrodes. In chapter 4 the development of a series of Mg aluminates [Mg(AlOR4)2] using a general synthetic platform based on Mg(AlH4)2 and various alcohols is presented. Preliminary electrochemical studies performed on these aluminate salts in dimethoxyethane identify the phenoxy and perfluoro-tert-butoxy derivatives as promising electrolyte systems. Electrochemical cycling of these electrolytes using gold and Mg electrodes show that systems containing chloride, brought through to the product from the starting material in the form of NaCl, exhibit lower plating/stripping overpotentials and higher Coulombic efficiencies than systems from which chloride had been removed. Further, these two electrolytes can be used in Mg full cells containing the Chevrel phase cathode. Solid-state 23Na NMR analysis as well as DFT calculations show that chloride-containing electrolytes facilitate the co-insertion of Na into the cathode material. In chapter 5 the hydroboration of pyridines and CO2 in the presence of pinacolborane is presented. An optimized system employing NH4BPh4 and HBpin is developed and a mechanism of pyridine hydroboration is proposed based on multinuclear NMR spectroscopy. The catalytic reaction was found to be catalyzed by a boronium salt, which was structurally characterized in the solid-state by single crystal X-ray diffraction. This new catalytic method is shown to be tolerant to a number of functional groups in the 3-position on pyridine as well as quinoline, and CO2, producing the hydroboration products in good yields.

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Li, Na. "Aluminum intercalation behaviours of Molecular Materials". Electronic Thesis or Diss., Sorbonne université, 2024. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2024SORUS222.pdf.

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Le premier chapitre introduit le concept et les caractéristiques fondamentales des matériaux moléculaires. Il met en évidence leurs vastes applications et les avantages qu'ils offrent dans les dispositifs électrochimiques, ainsi qu'un aperçu de leur développement dans ce domaine. Ensuite, les matériaux moléculaires sont classés de trois manières distinctes selon différents critères. Les sous-catégories de chaque classification sont systématiquement expliquées, mettant en lumière différents aspects des matériaux moléculaires selon la méthode de classification.À partir des batteries à ions multivalents, le deuxième chapitre introduit la batterie à ions aluminium émergente comme un système de stockage avec un grand potentiel. Les avantages du développement des batteries à ions aluminium sont montrés à partir des avantages objectifs de l'abondance naturelle et du prix de l'aluminium lui-même, ainsi que du potentiel électrochimique théorique de l'aluminium. Ensuite, du point de vue des électrolytes et des matériaux d'électrode, les batteries à ions aluminium et leur état de développement sont résumés à travers une classification détaillée et des exemples.Par conséquent, sur la base de notre compréhension des matériaux moléculaires et des batteries à ions aluminium, nous avons mené les deux projets suivants :Dans un travail de pionnier, nous avons rapporté les capacités de stockage d'ions lithium du polymère de coordination unidimensionnel (1D) bimétallique fer-nickel, {[FeIII(Tp)(CN)3]2[NiII(H2O)2]}n. Le résultat a d'abord confirmé l'intercalation réversible de Li+ dans le matériau moléculaire à pont cyanure 1D. Cette tentative réussie dans les batteries à ions lithium a éveillé notre intérêt pour explorer davantage la possible insertion d'ions aluminium dans une telle chaîne à pont cyanure unidimensionnelle. Dans ce travail, nous avons sélectionné l'électrolyte liquide ionique ([EMIm]Cl-AlCl3 avec un rapport de 1,1:1 (AlCl3 : ([EMIm]Cl)) comme électrolyte, et développé une série de matériaux unidimensionnels (1D) avec la formule {[FeIII(Tp)(CN)3]2[MII(H2O)2]}n (M = Ni, Co, Mn, Zn, Cu). Nous avons supposé que la faible dimensionnalité et la structure ouverte de ces composés pourraient permettre une (dés)intercalation ionique plus facile et une meilleure capacité d'accueil des ions Al. Nous pouvons également émettre l'hypothèse que la présence d'une enveloppe organique (ligands Tp) dans les chaînes pourrait favoriser des interactions électrostatiques plus faibles entre le cation multivalent inséré et le cadre, et donc une meilleure diffusion. De plus, des comparaisons entre les composés pontés par différents métaux divalents, y compris le zinc inactif, sont destinées à aider à comprendre les effets multiples des métaux pontés sur les composés.Ensuite, nous avons abordé le deuxième sujet basé sur l'acide chloranilique. Il s'agit d'une série de cadres bidimensionnels (2D), car nous souhaitons tirer parti de la haute stabilité de la structure 2D et compter sur les groupes carbonyles potentiels pour réaliser l'intercalation et la désintercalation. En conséquence, les tests préliminaires prouvent la stabilité de cette série de cadres. Étant donné qu'il s'agit d'un projet en cours et que nous n'avons rapporté que les données jusqu'à présent, une investigation plus approfondie de cette série est nécessaire
The first chapter introduces the concept and fundamental characteristics of molecular materials. It highlights their broad applications and the advantages they offer in electrochemical devices, along with an overview of their development in this field. Then, molecular materials are classified in three distinct ways based on different criteria. Each classification's subcategories are systematically explained, highlighting different aspects of molecular materials according to the classification method.Starting from multivalent ion batteries, the second chapter introduces the emerging aluminum ion battery as a storage system with great potential. The advantages of developing aluminum ion batteries are shown from the objective advantages of the natural abundance and price of aluminum itself, and the theoretical electrochemical potential of aluminum. Then, from the two aspects of electrolyte and electrode materials, aluminum ion batteries and their development status are summarized through detailed classification and examples.Therefore, based on our understanding of molecular materials and aluminum ion batteries, we conducted the following two projects:In a seminal work, we reported the lithium-ion storage capabilities of the iron-nickel bimetallic one-dimensional (1D) coordination polymer, {[FeIII(Tp)(CN)3]2[NiII(H2O)2]}n. The result first confirmed the reversible Li+ (de)intercalation in the 1D cyanide-bridged molecular material. This successful attempt in lithium-ion batteries aroused our interest in further exploring the possible insertion of aluminium ions into such one-dimensional cyano-bridge. In this work, we selected ([EMIm]Cl-AlCl3 ionic liquid with the ratio of 1.1:1(AlCl3 : ([EMIm]Cl) as electrolyte, and developed a series of one-dimensional (1D) material with the formula{[FeIII(Tp)(CN)3]2[MII(H2O)2]}n (M=Ni, Co, Mn, Zn, Cu). We expected the lower dimensionality and open framework of these compounds could permit easier ion (de)intercalation and a better Al-ion host capability. We can also hypothesize that the presence of organic shell (Tp ligands) in the chains could favor weaker electrostatic interactions between the inserted multivalent cation and the framework, and thus a better diffusion. Furthermore, comparisons between compounds bridged different divalent metals, including inactive zinc, are intended to help understand the multifaceted effects of bridged metals on compounds.Then, we conducted the second topic based on chloranilic acid. It is a series of 2D frameworks, as we would like to take advantage of the high stability of 2D structure and rely on the potential carbonyl groups to realize the intercalation and deintercation. As a result, the preliminary tests prove the stability of this series of frameworks. Since this is an ongoing project and we have only reported the data so far, further investigation of this series is needed

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Wu-Tiu-Yen, Jenny. "Valorisation de la vinasse de canne à sucre : étude d'un procédé d'extraction d'un acide organique multivalent". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLA008.

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La vinasse de distillerie, co-produit de l’industrie canne-sucre-alcool-énergie, contient de 5 à 7 g/L d’un acide d’intérêt, l’acide aconitique, au sein d’un milieu complexe comportant d’autres acides organiques, des acides aminés, mais surtout des sels minéraux (chlorures et sulfates) et des colorants, rendant sa purification complexe. Afin d’améliorer les performances du procédé d’échange d’ions, au coeur de cette purification, la résine anionique faible Lewatit S4528 a été caractérisée. Le dosage de la résine et des mesures d’isothermes d’échange d’ions ont permis de définir : la capacité totale du support, l’ordre d’affinité des principaux anions de la vinasse et les coefficients d’échange d’ions associés, de même que la capacité pour l’acide d’intérêt dans cette matrice complexe. L’effet du pH, de la forme du support (sulfate, chlorure et base libre) et de l’éluant ont été étudiés en colonne pour différentes solutions (acide seul, vinasse « modèle », vinasse réelle), permettant de préciser les mécanismes de la purification.Les meilleures conditions (vinasse à pH 4,5, résine sous forme chlorure et élution par HCl 0,5 N) ont abouti à un éluat d’une pureté de 28 %MS avec un rendement global de 61 %. Pour éliminer les principales impuretés qui persistent dans l’éluat (ions chlorure et sulfate et des colorants), l’électrodialyse s’est avérée un procédé très performant en ce qui concerne l’élimination des ions chlorure (proche de 100 %) tandis qu’une étape d’adsorption sur résine polystyrénique XAD16 permet l’élimination de 80 % de la charge colorante de l’éluat acide. Le couplage le plus intéressant associe microfiltration, échange d’ions, électrodialyse et adsorption. Il permet d’obtenir une pureté estimée à 37 % MS, avec un facteur de purification de 3,6 par rapport à la vinasse initiale. Ces travaux ont permis d’améliorer d’un facteur 2,6 la pureté de l’acide par rapport à des études antérieures et de mieux comprendre les mécanismes de sa purification sur résine anionique faible
Cane stillage or vinasse, a byproduct of cane industry, contains from 5 to 7 g/L of aconitic acid, a valuable trivalent carboxylic acid belonging to the second class of building block chemicals. Vinasse also contains a variety of organic compounds (organic acids, amino-acids, colouring matters) and minerals (chlorides, sulphates), which makes purification not straightforward. The objective of this work is to develop the extraction of aconitic acid from stillage, with anion exchange as the heart of the process. In order to improve performances, the main characteristics of the selected anion-exchange resin (Lewatit S4528) are studied. Acid-base dosage and ion-exchange equilibrium experiments allow the total capacity of this support and the ion-exchange coefficients for the major competing anions (aconitate, chloride and sulfate) to be obtained. Separation performances in column are studied for different pH, different solutions (aconitic acid alone, synthetic and industrial stillage) and different resin forms (sulfate, chloride and free- base) in order to elucidate the separation mechanisms.Elution step is also investigated. Best conditions are for stillage at its natural pH (pH 4.5) on the resin under chloride form and HCl 0,5N as the eluant. A 28% DM purity and a 61% global recovery are achieved for aconitic acid in the eluate. Main impurities still remaining are chlorides or sulfates and coloring matter. Homopolar electrodialysis proves successful for removing nearly 100% chlorides from aconitic acid with a limited loss of the acid (< 15%). Adsorption step on a polystyrenic resin (XAD16) of an acidic eluate leads to the retention of 80% of the colorants, with only 12% of the acid lost. At last, the most interesting process combination associates microfiltration, anion-exchange, electrodialysis and adsorption. Purity is 37% MS, namely 3.6 higher than the original vinasse. This work enables aconitic acid purity to be improved by a factor of 2.6 compared with prior studies and to have a better comprehension of the mechanisms involved in its purification on weak anionic resin

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Padigi, Sudhaprasanna Kumar. "Multivalent Rechargeable Batteries". PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2464.

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Li+ ion batteries have been the mainstay of high energy storage devices that have revolutionized the operating life time of consumer electronic devices for the past two decades. However, there is a steady increase in demand for energy storage devices with the ability to store more energy and deliver them at high power at low cost, without comprising safety and lifetime. Li-ion batteries have had significant challenges in increasing the amount of stored energy without affecting the overall lifetime and the ability to deliver stored energy. In order to store and deliver more energy, more lithium ions need to be inserted and extracted from a given electrode (cathode or anode). Upon inserting a large number of Li ions, the crystal lattice of the materials undergo severe mechanical distortions, leading to un-desirable structural changes. This results in underutilization of theoretical energy storage capacities of the electrodes and early failure of the batteries owing to instabilities in the electrode materials. Unlike monovalent Li+ ions, multivalent rechargeable batteries offer a potential solution to the above problems. Multivalent cations, such as Ca2+, are doubly-ionized as opposed to Li+ which is a monovalent cation. The advantages of using Ca2+ ions instead of Li+ ions are multifold. Due to the doubly-ionized nature, only half the number of Ca2+ ions need to be inserted and extracted from a given electrode to store and deliver energy from a high capacity cathode as compared to Li+ ions. This reduces the probability of lattice distortion and un-desirable structural changes, further leading to increased utilization of high theoretical energy storage capacities of the electrodes (cathode and anode). The use of Ca2+ ions also helps in delivering twice the amount of current density as compared to Li+ ions due to its doubly ionized nature. In this work, a set of eight metal hexacyanoferrate compounds were synthesized using the following metal ions: Ba2+, Mn2+, Zn2+, Co2+, Fe3+, Al3+, Sn4+, Mo5+. The resulting metal hexacyanoferrate compounds were subjected to physical characterization using scanning electron microscope (SEM) and powder x-ray diffraction (XRD), to determine physical properties such as size, morphology, unit cell symmetry and unit cell parameters. This was followed by electrochemical characterization utilizing cyclic voltammetry and galvanic cycling, to determine the specific capacity and kinetics involved in the transport of Ca2+ ions to store charge. Optical characterization of the metal hexacyanoferrates using Fourier transform infrared (FTIR) spectroscopy, allowed for the identification of metal-nitrogen stretching frequency, which was used as a measure of the strength of the metal-nitrogen bond to understand the role of the above mentioned metal ions in electron density distribution across the unit cell of the metal hexacyanoferrates. The specific capacity utilization of the metal hexacyanoferrates, when compared to the electronegativity values (Xi) of the above mentioned metal ions, the σ- parameter, and the metal-nitrogen stretching frequency (v), revealed an empirical trend suggesting that the materials (FeHCF, CaCoHCF and CaZnHCF) that possessed intermediates values for the above mentioned parameters demonstrated high capacity utilization (≥50%). Based on these empirical trends, it is hypothesized that a uniform distribution of electron density around a unit cell, as reflected by intermediate values of the electronegativity (Xi) of the above mentioned metal ions, the σ-parameter and the metal-nitrogen stretching frequency (v), results in minimal electrostatic interactions between the intercalating cation and the host unit cell lattice. This results in relatively easy diffusion of the cations, leading to high specific capacity utilization for metal hexacyanoferrate cathodes. These parameters may be used to select high efficiency cathode materials for multivalent batteries.

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Mehta, Mary Anne. "Multivalent ions in polymer electrolytes". Thesis, University of St Andrews, 1993. http://hdl.handle.net/10023/15517.

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The electrochemical, thermal and structural properties of polyethylene oxide (PEO) based polymer electrolytes containing multivalent ions were investigated. The phase diagram for the PEO:Ca(CF3SO3)2 system was determined by x-ray diffraction and differential scanning calorimetry techniques. Precipitation of the salt from the system at high temperatures was directly observed by variable temperature x- ray diffraction. This was ascribed to a negative entropy of dissolution of the salt in the polymer. A new crystalline complex PEO6Ca(CF3SO3)2, which exhibits a phase transition between two polymorphic forms was observed. The temperature dependence of ionic conductivity was related to the phase diagram. Redox behaviour of the PEO:Nil2 system was probed. Motion of the Ni(II) species through the system was extremely slow as evidenced by the low effective diffusion coefficient (1.82 x 10 11 cm 2s−1) and cationic current fraction (F+ < 0.1). Deposition of nickel from the polymer was characterised by instantaneous nucleation followed by three dimensional diffusion controlled growth. Investigation of the redox behaviour of the PE0:Eu(CF3SO3)3 system indicated that reduction of Eu3+ followed an ec mechanism. Evidence was obtained for extremely slow diffusion of Eu3+ containing species (D[sub]eff ~ 3.66 x 10 −16cm2s−1) through the system and slow kinetics of electron transfer. Thermal studies of the PEO:Co(SCN)2 system indicated that the glass transition temperature (Tg) was grossly elevated by the presence of Co(SCN)2 in the polymer. The absence of a crystalline PEO:Co(SCN)2 complex was ascribed to the high Tg which leads to slow crystallisation kinetics. UV-visible spectra indicated that the Co2+ ion was tetrahedrally coordinated in the system at low salt concentrations. The structure of the PEO3NaClO4 crystalline complex was reported as a subsidiary study.

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Matsarskaia, Olga [Verfasser]. "Multivalent ions for tuning the phase behaviour of protein solutions / Olga Matsarskaia". Tübingen : Universitätsbibliothek Tübingen, 2020. http://d-nb.info/1223451739/34.

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Louisfrema, Wilfired. "Caractérisation des oxydes nanoporeux contenant des ions lourds en milieu aqueux". Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEE055/document.

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Les aluminosilicates poreux cristallins tels que les zéolithes cationiques de type faujasite sont largement étudiés en raison de leurs propriétés d’adsorption, d’échange ionique et de catalyse, ce qui leurs valent d’être engagées dans de nombreuses applications industrielles, qui font intervenir de plus en plus de cations multivalents (détergents/ adoucissants, craquage catalytique, décontamination,...). Ces différentes applications industrielles ont en commun les propriétés d’adsorption, résultant d’une part de la taille de leurs pores du même ordre de grandeur que les espèces introduites, et d’autre part de leur composition chimique qui conduit à des charges de charpente, à l’origine de sites de forte interaction ou de répulsion localisés. Dans ces applications, les zéolithes sont hydratées. L’eau est associée aux processus mis en jeu et influence ainsi les autres propriétés du matériau. La modélisation moléculaire est un outil de choix pour prédire et comprendre les propriétés microscopiques du matériau hydraté, qui sont difficilement accessibles expérimentalement. Ce travail de modélisation porte plus précisément sur le comportement des cations multivalents dans les matériaux zéolithiques hydratés, en collaboration avec des expérimentateurs. Notre étude sur une zéolithe faujasite Y a permis tout d’abord de clarifier la migration des cations sodium au cours de la déshydratation, et de prédire la localisation cationique dans le matériau hydraté en présence d’ions bivalents. De plus, nous avons montré qu’il était possible de rationaliser conjointement la migration des cations et les déformations structurales dans la faujasite au cours de l’adsorption d’eau. À cet effet, nous avons développé une méthode d’analyse pour la localisation cationique. La bonne performance d’un champ de force polarisable démontrée au cours de ce travail ouvre la voie à l’étude de la dynamique globale du système, en permettant le suivi de la migration cationique simultanément à la déformation de la charpente. A plus long terme, cette approche pourra être étendue à d’autres ions multivalents d’intérêt (terres rares, éléments f, ...)
Porous crystalline aluminosilicates such as cationic zeolites, are widely studied because of their adsorption, ion exchange and catalytic properties, which explain their use in many industrial applications. Examples of the latter, which involve in particular multivalent cations, include detergents/softeners, catalytic cracking, or decontamination. Such industrial applications of zeolites all exploit their adsorption properties, which vary as a function of the pore size, comparable to the adsorbing molecules, or chemical composition, which results in charges within the framework, and in turn strong binding or repulsive sites. Importantly, in such applications zeolites are hydrated. Water is involved in the microscopic processes and thus influences all properties of the material. Molecular modeling is a weapon of choice to predict and understand the microscopic properties of the hydrated material, which are difficult to access experimentally. More precisely, the present modeling work deals with the behavior of multivalent cations in hydrated zeolites, in collaboration with experimentalists. Our study on zeolite Y faujasite first allowed us to clarify the migration of sodium cations upon dehydration and to predict the cation localisation in the hydrated material in the presence of divalent cations. Furthermore, we rationalized the coupled migration of cations and deformation of the framework upon water adsorption. To this end, we have developed a new method for the analysis of cation localization. The good performance of a polarizable force field demonstrated here paves the way for the study of the dynamics of the whole system, following in particular the simultaneous migration of cations and deformation of the framework. Such an approach could be later extended to other multivalent ions of industrial interest (rare Earths, f-block elements, ...)

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Ritt, Marie-Claude. "Thermodynamics of interaction of macrocyclic ligands with multivalent ions and organic molecules of biological importance". Thesis, University of Surrey, 1991. http://epubs.surrey.ac.uk/843105/.

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The first part of this work deals with the determination of the thermodynamic parameters for the complexation of lanthanide cations (La3+, Pr3+ and Nd3+) with Cryptand-221 and Cryptand-222 in acetonitrile and propylene carbonate at 298.15 K. The complexation process between these cations and these ligands in these solvents is enthalpy-controlled. The higher stability observed for these cations and these ligands in propylene carbonate with respect to acetonitrile is attributed to the increase in entropy observed for the complexation reaction in propylene carbonate. Enthalpies of solution of lanthanide and lanthanide cryptates are reported. These data are used to derive single-ion enthalpies of transfer of La3+, Pr3+ and Nd3+ from propylene carbonate to acetonitrile based on the Ph4AsPh4B convention. The results show that the cryptate conventions are not valid for the calculation of single-ion values for the transfer of tervalent lanthanide cations among dipolar aprotic media. Enthalpies of coordination of lanthanide(III) cryptates in the solid state are calculated. The second part of this study aims to investigate the properties of the synthetic macrocyclic ligands such as Cryptand-222 and 18-Crown-6 towards molecules of biological importance. Stability constants (hence free energies), enthalpies and entropies of complexation of a series of DL-amino acids with 18-Crown-6 and Cryptand-222 in methanol and ethanol, as obtained from titration calorimetry, are reported. No significant variations are found in the free energies of complexation of the different amino acids and these two ligands in these solvents as a result of an enthalpy-entropy compensation effect. This effect is for the first time shown in complexation reactions involving crown ethers and cryptands. The thermodynamic parameters of transfer of amino acids and their complexes with 18-Crown-6 and Cryptand-222 from methanol to ethanol have been calculated. Possible correlations between complexation and transfer data for the amino acids, the ligands and the amino acid-macrocyclic ligand complexes are investigated. The implications of these results to processes of biological importance are discussed. As a continuation of this study, the possibility of selectively extracting amino acids from methanol by polymeric resins containing crown ethers as anchor groups is investigated.

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Grawe, Thomas. "Multivalente Rezeptoren auf Phosphonatbasis molekulare Erkennung und Selbstorganisation in Wasser /". [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963938290.

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Wolf, Marcell Verfasser], e Frank [Akademischer Betreuer] [Schreiber. "Effective interactions in liquid-liquid phase separated protein solutions induced by multivalent ions / Marcell Wolf ; Betreuer: Frank Schreiber". Tübingen : Universitätsbibliothek Tübingen, 2015. http://d-nb.info/1197057757/34.

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Libri sul tema "Ion multivalent"

Conference, Society for Emblem Studies International. Polyvalenz und Multifunktionalität der Emblematik =: Multivalence and multifunctionality of the emblem : proceedings of the 5th International Conference of the Society for Emblem Studies. Frankfurt am Main: Oxford, 2002.

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Society for Emblem Studies. International Conference. Polyvalenz und Multifunktionalität der Emblematik =: Multivalence and multifunctionality of the emblem : proceedings of the 5th International Conference of the Society for Emblem Studies. Frankfurt am Main: Oxford, 2002.

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Norris, Robin, Rebecca Stephenson e Renée R. Trilling. Feminist Approaches to Early Medieval English Studies. Nieuwe Prinsengracht 89 1018 VR Amsterdam Nederland: Amsterdam University Press, 2022. http://dx.doi.org/10.5117/9789463721462.

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Scholarship on early medieval England has seen an exponential increase in scholarly work by and about women over the past twenty years, but the field has remained peculiarly resistant to the transformative potential of feminist critique. Since 2016, Medieval Studies has been rocked by conversations about the state of the field, shifting from #MeToo to #WhiteFeminism to the purposeful rethinking of the label “Anglo-Saxonist.” This volume takes a step toward decentering the traditional scholarly conversation with thirteen new essays by American, Canadian, European, and UK professors, along with independent scholars and early career researchers from a range of disciplinary perspectives. Topics range from virginity, women’s literacy, and medical discourse to affect, medievalism, and masculinity. The theoretical and political commitments of this volume comprise one strand of a multivalent effort to rethink the parameters of the discipline and to create a scholarly community that is innovative, inclusive, and diverse.

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Society for Emblem Studies. International Conference. Polyvalenz und Multifunktionalität der Emblematik: Akten des 5. Internationalen Kongresses der Society for Emblem Studies = Multivalence and multifunctionality of the emblem : proceedings of the 5th International Conference of the Society for Emblem Studies. New York: P. Lang, 2002.

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1941-, Hag Kari, e Broch Ole Jacob, a cura di. The ubiquitous quasidisk. Providence, Rhode Island: American Mathematical Society, 2012.

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Culver, Annika A., e Norman Smith, a cura di. Manchukuo Perspectives. Hong Kong University Press, 2020. http://dx.doi.org/10.5790/hongkong/9789888528134.001.0001.

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This collection reveals how, in Manchukuo (1932-1945), literature both furthered national aims while contesting them, as writers of varied ethnicities engaged in multivalent strategies to continue cultural production amidst difficult political circumstances. Studies of their work by transnational scholars today demonstrate that these writers faced factors influencing outcomes of their production, such as censorship, the Japanese puppet regime's propaganda aims, and even the market. In addition, particular hybrid language practices emerged, with writers engaging in transnational practices in a border region. This volume examines what we call "Manchukuo perspectives" unique to cultural producers in a state transformed by Japanese interests, but later shaped by more inclusive multivalent aims, reflected in the writings of Chinese, Korean, and Russian intellectuals who felt a keen loss of nation, which also included Japanese converted leftists who transformed their antipathy towards imperialist capitalism into support for a fascist state offering the utopian promises of a "right-wing proletarianism".

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Muller, Hannah Weiss. The Laws of Subjecthood. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780190465810.003.0002.

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Chapter 1 explores the myriad legal understandings of subject status that coexisted in the seventeenth and eighteenth centuries. It revisits the landmark case of Calvin v. Smith, among others, in order to examine notions of allegiance, obedience, and protection that cast a long shadow over subsequent interpretations of subject status. Many of the questions left unanswered by this case, particularly those relating to the specific nature of allegiance and protection, led to further definitions and legal quandaries. The numerous treaties, opinions, and correspondence in which subjecthood was also discussed illuminate the importance of local factors and agents in shaping the multivalent legal ideas available to contemporaries.

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germ Society for Emblem Studies International Conference 1999 Munich. Polyvalenz Und Multifunktionalitat Der Emblematik: Akten Des 5. Internationalen Kongresses Der Society For Emblem Studies = Multivalence And Multifunctionality ... (Frankfurt Am Main, Germany), Bd. 65.). Peter Lang Publishing, 2002.

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Davison, Claire. Cross-Channel Modernisms. A cura di Derek Ryan e Jane A. Goldman. Edinburgh University Press, 2020. http://dx.doi.org/10.3366/edinburgh/9781474441872.001.0001.

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Described by Katherine Mansfield in 1921 as ‘a great cold sword between you and your dear love Adventure’, in the early twentieth century the English Channel, or ‘la Manche’ in French, represented both a political and intellectual barrier between European avant-gardism and British restraint, and a bridge for cultural connection and aesthetic innovation. Organised around key terms ‘Translating’, ‘Fashioning’ and ‘Mediating’, this book presents ten original essays by scholars working on both sides of the Channel. Cross-Channel Modernisms historicises artistic exchanges in Britain, France and beyond, and proposes a rich conceptual apparatus of ‘crossings’ and ‘channels’ through which we can read modernism and understand it as emerging from, and intervening in, an always-already shifting, multivalent, international context.

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Edwards, Leigh H. Country Music and Class. A cura di Travis D. Stimeling. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780190248178.013.19.

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This chapter establishes how class is a key category of analysis for country music studies because the genre is still symbolically associated with a southern white working-class audience and milieu and shares much in common with long-running thematic traditions in country music, even though audiences have always been broader. Through case studies about Johnny Cash as well as about Dolly Parton and the hillbilly trope, the chapter demonstrates the importance of discussing class in relation to gender and race in the genre. Class themes in country music can be multivalent. The chapter also links class to the genre’s regional folk culture roots and details the relevance of the blurred, arbitrary categories of folk culture and mass culture to country music.

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Capitoli di libri sul tema "Ion multivalent"

Dubinin, Vladimir N. "Multivalent Functions". In Condenser Capacities and Symmetrization in Geometric Function Theory, 277–304. Basel: Springer Basel, 2014. http://dx.doi.org/10.1007/978-3-0348-0843-9_8.

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Rocchi, Paolo. "Bivalent and Multivalent Logic". In Series in Computer Science, 121–29. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0109-1_13.

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Hayman, Walter K., e Eleanor F. Lingham. "Univalent and Multivalent Functions". In Problem Books in Mathematics, 133–84. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25165-9_6.

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Richards, Sarah-Jane, Caroline I. Biggs e Matthew I. Gibson. "Multivalent Glycopolymer-Coated Gold Nanoparticles". In Methods in Molecular Biology, 169–79. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3130-9_14.

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Pannier, Nadine, Valerie Humblet, Preeti Misra, John Frangioni V. e Wolfgang Maison. "Multivalent peptidomimetics for tumor targeting". In Advances in Experimental Medicine and Biology, 403–4. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/978-0-387-73657-0_174.

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Brown, Steven D. "Multivalent Display Using Hybrid Virus Nanoparticles". In Methods in Molecular Biology, 119–40. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-7893-9_10.

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Liu, Cassie J., e Jennifer R. Cochran. "Engineering Multivalent and Multispecific Protein Therapeutics". In Engineering in Translational Medicine, 365–96. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4372-7_14.

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Chinarev, Alexander A., Oxana E. Galanina e Nicolai V. Bovin. "Biotinylated Multivalent Glycoconjugates for Surface Coating". In Methods in Molecular Biology, 67–78. Totowa, NJ: Humana Press, 2009. http://dx.doi.org/10.1007/978-1-60761-454-8_5.

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Huynh, Kim, e Marie-Pierre Merlateau. "Uncertainty, Multivalence and Growth". In Human Capital Creation in an Economic Perspective, 196–213. Heidelberg: Physica-Verlag HD, 1994. http://dx.doi.org/10.1007/978-3-642-99776-1_10.

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Yamini, Goli, e Ekaterina M. Nestorovich. "Multivalent Inhibitors of Channel-Forming Bacterial Toxins". In Current Topics in Microbiology and Immunology, 199–227. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/82_2016_20.

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Atti di convegni sul tema "Ion multivalent"

Tan, Qiyan, Weichuan Guo, Gutian Zhao, Yajing Kan, Yinghua Qiu e Yunfei Chen. "Charge Inversion of Mica Surface in Multivalent Electrolytes". In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62356.

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Interaction between solid surfaces in aqueous electrolyte solutions is of great importance to many diverse domains, such as bioMEMS, nanofluidics, colloid science, polymer physics, and molecular biophysics. Several counterintuitive phenomena occur at high concentrations of multivalent ions. In this article, charge reversion, the sign reversal of the effective surface charge in the presence of multivalent counterions, is directly observed through the force between two mica surfaces in aqueous solutions of trivalent cations by surface forces measurements. The effective surface potential functioned with bulk concentration is calculated from an analytical model based on ion correlations. The obtained force profiles can be described by the analytical model when ion correlations effects are taken into account, while Poisson-Boltzmann theory fails. It reveals that ion correlations are important for screening charged surface in the presence of multivalent counterions.

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Oh, K., U. C. Paek e T. F. Morse. "Photosensitivity in multi-valent rare earth ion doped aluminosilicate glass optical fiber". In Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/bgppf.1997.jsue.18.

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Multivalent rare earth ion, Sm+2/Sm+3 was incorporated into aluminosilicate glass fiber using an aerosol delivery technique. Co-doping of trivalent and divalent states of the ions has been spectroscopically confirmed. Irradiated by multi-line CW Ar ion laser of 1 Watt, the fiber showed photoinduced refractive change of 7.6 × 10−5. Bleaching of Sm+2 absorption band was also observed. Photoionization of Sm+2 is believed to be a main cause of the photosensitivity.

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Lapitsky, Yakov, Sabrina Alam, Udaka de Silva, Jennifer Brown, Carolina Mather e Youngwoo Seo. "Surfactant-loaded Polyelectrolyte/multivalent Ion Coacervates for the Multi-month Release of Antibacterial and Therapeutic Payloads". In Virtual 2021 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2021. http://dx.doi.org/10.21748/am21.267.

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Feldmann, Felix, Emad W. Al-Shalabi e Waleed AlAmeri. "Carbonate Mineral Effect on Surface Charge Change During Low-Salinity Imbibition". In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206013-ms.

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Abstract Low-salinity waterflooding is a relatively simple and cheap improved oil recovery technique in which the reservoir salinity is optimized to increase oil recovery. Multivalent ion enriched as well as diluted brines have shown promising potential to increase oil production over conventional waterflooding. While the literature generally acknowledges that low-salinity improves oil recovery, the physical mechanisms behind low-salinity effects are still controversial. Surface charge change refers to a low-salinity mechanism in which modified brine is believed to cause a re-equilibrium of the carbonate surface potential. As a result of surface charge change, the rock wettability alters towards a more water-wetting state. This experimental study combines zeta potential, spontaneous imbibition, and contact angle measurements to highlight the effect of carbonate minerals on surface charge change. Initially, zeta potential measurements were conducted to compare the impact of five carbonate minerals (Indiana Limestone, Edward Limestone, Reservoir Limestone, Austin Chalk, and Silurian Dolomite) and brine compositions (Formation-water, Sea-water, and Diluted-sea-water) on carbonate surface charge. Moreover, the impact of potential determining ions (calcium, magnesium, and sulfate) on the mineral surface charge was investigated. The effect of carbonate minerals on spontaneous oil recovery was investigated by comparing the spontaneous imbibition of Formation-water, Sea-water, and Diluted-sea-water into the five carbonate minerals. Moreover, the wettability alteration during the spontaneous imbibition tests was quantified by conducting contact angle measurements. The brine-mineral zeta potential measurements were positive for Formation-water, slightly negative for Sea-water, and strongly negative for Diluted-sea-water. While calcium and magnesium ions promoted stronger positive electrical potentials, sulfate ions caused a zeta potential reduction. The magnitude of surface charge change was significantly different for the five tested carbonate minerals. Under the presence of Diluted-sea-water, the zeta potential measurements of Indiana Limestone and Austin Chalk resulted in strong negative electrical potentials. Reservoir Limestone and Edward Limestone showed less negative zeta potentials, while Silurian Dolomite and Diluted-sea-water resulted in slightly negative zeta potential results. Compared to Formation-water, Sea-water, and particularly Diluted-sea-water caused significant spontaneous oil recovery. The high spontaneous oil recovery of Diluted-sea-water and Indiana Limestone and Austin Chalk correlated with strong negative brine-mineral zeta potentials. Moderate spontaneous oil recovery was observed for the slightly negative zeta potential Sea-water and limestone/chalks systems. The contact angle measurements showed oil-wet contact angles under the presence of Formation-water, while the introduction of Sea-water and Diluted-sea-water promoted stronger water-wet contact angles. This work is one of the very few studies that investigates the effect of carbonate rock mineralogy on surface charge change and spontaneous oil recovery.

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Vaclavikova, Barbora. "INFLUENCE�OF�MULTIVALENT�IONS�FOR�ELECTROKINETIC�POTENTIAL�OF�QUARZ�AND�FELDSPAR". In SGEM2012 12th International Multidisciplinary Scientific GeoConference and EXPO. Stef92 Technology, 2012. http://dx.doi.org/10.5593/sgem2012/s04.v2005.

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McKenna, Nick, Liane Guillou, Mohammad Javad Hosseini, Sander Bijl de Vroe, Mark Johnson e Mark Steedman. "Multivalent Entailment Graphs for Question Answering". In Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing. Stroudsburg, PA, USA: Association for Computational Linguistics, 2021. http://dx.doi.org/10.18653/v1/2021.emnlp-main.840.

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Datta, Subhra, e Albert Conlisk. "Role of multivalent ions and electrical double layer overlap in electroosmotic nanoflows". In 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-1120.

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McClary, Scott, Daniel Long, Kathryn Small, Alan Landers, Ana Sanz-Matias, Paul Kotula, David Prendergast, Katherine Jungjohann e Kevin Zavadil. "Electrolyte Design for Stable Multivalent Metal Anodes." In Proposed for presentation at the 32nd Annual Rio Grande Symposium on Advanced Materials held October 24-24, 2022 in Albuquerque, NM United States. US DOE, 2022. http://dx.doi.org/10.2172/2005914.

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Kwak, Hyung Tae, Ali A. Yousef e Salah Al-Saleh. "New Insights on the Role of Multivalent Ions in Water-Carbonate Rock Interactions". In SPE Improved Oil Recovery Symposium. Society of Petroleum Engineers, 2014. http://dx.doi.org/10.2118/169112-ms.

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McClary, Scott, Daniel Long, Ana Sanz-Matias, Alan Landers, Kathryn Small, Paul Kotula, David Prendergast, Katherine Jungjohann e Kevin Zavadil. "Identifying multivalent metal anode interphases using cryogenic electron microscopy." In Proposed for presentation at the 2022 Fall American Chemical Society Meeting held August 21-25, 2022 in Chicago, IL. US DOE, 2022. http://dx.doi.org/10.2172/2004460.

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Rapporti di organizzazioni sul tema "Ion multivalent"

Conlisk, A. T., e Minami Yoda. Transport of Multivalent Electrolyte Mixtures in Micro- and Nanochannels. Fort Belvoir, VA: Defense Technical Information Center, novembre 2013. http://dx.doi.org/10.21236/ada607255.

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Palmer, Guy H., Eugene Pipano, Terry F. McElwain, Varda Shkap e Donald P. Knowles, Jr. Development of a Multivalent ISCOM Vaccine against Anaplasmosis. United States Department of Agriculture, luglio 1993. http://dx.doi.org/10.32747/1993.7568763.bard.

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Anaplasmosis is an arthropod+borne disease of cattle caused by the rickettsia Anaplasma marginale and an impediment to efficient production of healthy livestock in both Israel and the United States. Our research focuses on development of a recombinant membrane surface protein (MSP) immunogen to replace current vaccines derived from the blood of infected cattle. The risk of widespread transmission of both known and newly emergent pathogens has prevented licensure of live blood-based vaccines in the U.S. and is a major concern for their continued use in Israel. Briefly, we accomplished the following in our BARD supported research: i) characterization of the intramolecular and intermolecular relationships of the native Major Surface Proteins (MSP) in the outer membrane; ii) expression, purification, and epitope characterization of the recombinant MSP-2, MSP-3, MSP-4, and MSP-5 proteins required to construct the recombinant ISCOM; iii) demonstration that the outer membrane-Quil A induces CD4+ T lymphocytes specific for the outer membrane polypeptides; iv) identification of CD4+ T lymphocytes that recognize outer membrane polypeptide epitopes conserved among other wise antigenically distinct strains; v) determination that immunization with the outer membrane-Quil A construct does not affect the ability of ticks to acquire or transmit A. marginale; and vi) demonstration that the outer membrane-Quil A construct induces complete protection against rickettsemia upon homologous challenge and significant protection against challenge with antigenically distinct strains, including tick transmission. Importantly, the level of protection against homologous challenge in the MSP vaccinates was comparable to that induced by live blood-based vaccines and demonstrates that development of a new generation of vaccines is feasible.

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Schwarz, Haiqing L. Tunable Graphitic Carbon Nano-Onions Development in Carbon Nanofibers for Multivalent Energy Storage. Office of Scientific and Technical Information (OSTI), gennaio 2016. http://dx.doi.org/10.2172/1235990.

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Cetinkaya, Asena. Multivalent Functions Involving Srivastava–Tomovski Generalization of the Mittag-Leffler Function Defined in the Nephroid Domain. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, febbraio 2021. http://dx.doi.org/10.7546/crabs.2021.02.02.

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Schmidt, Piet. Origins of Effective Charge of Multivalent Ions at a Membrane/Water Interface and Distribution of 2,3,4,5-Tetrachlorophenol in a Membrane Model System. Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.6925.

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