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Tesis sobre el tema "Hydroxides doubles layered"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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1

Grosu, Elena-Florentina. "Layered double hydroxides and their composites : design, synthesis and specific applications." Thesis, Lille, 2019. http://www.theses.fr/2019LIL1R011.

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Explorer les caractéristiques à l'échelle nanométrique de la matière et la combiner avec d’autres matériaux, permettent la fabrication de nouveaux objets avec des fonctionnalités améliorées, pour une utilisation potentielle dans le domaine biomédical, la catalyse, l'ingénierie, l'électronique, la biotechnologie, etc… Les argiles anioniques, également appelées des Hydroxydes Doubles Lamellaires (HDL), constituent une catégorie de matériaux hydrotalcite qui possèdent une grande variété de compositions et une capacité d'auto-assemblage. Lorsque ces HDL sont utilisés en présence de systèmes biolog

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2

Drici, Nawal. "Hydroxydes doubles lamellaires, synthèse, caractérisation et propriétés." Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCD007/document.

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L’étude cinétique a permis de déterminer le temps d’équilibre atteint lors de la fixation du benzopurpurine 4B sur chaque composé, ainsi que l’ordre de la réaction et la nature du mécanisme de diffusion. Cette adsorption est favorisée par un milieu légèrement basique, et l’augmentation de la température a un effet positif sur l’amélioration des performances maximales de la fixation. L’étude des isothermes d’adsorption de ce colorant, a été établie pour déterminer l’efficacité de cette nouvelle classe d’adsorbants. Ces dernières sont de type L, et les donnés de sorption ont été traitées selon p

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3

Al-Jaberi, Muayad. "Characteristics and mechanisms of phosphate removal by calcium-iron layered double hydroxides and their hydrolysis products." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0056.

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La mise au point de nouveaux matériaux pour piéger les anions phosphate présents dans les eaux usées est une des clés pour lutter contre le phénomène d’eutrophisation des eaux de surface. Au cours de cette étude, les hydroxydes doubles lamellaires contenant des ions CaII et FeIII dans les feuillets cationiques et des anions chlorure et nitrate au sein de l’espace inter-feuillets (CaFe-HDL-Cl et CaFe-HDL-NO3) ont été utilisés pour piéger les phosphates. Ces deux variantes d’HDL ont été synthétisées par trois méthodes simples de co-précipitation. La capacité de piégeage de ces matériaux a été év

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4

Vialat, Pierre. "Composition, structure et comportement électrochimique d'Hydroxydes Doubles Lamellaires au cobalt : vers des applications en tant que matériaux d'électrodes." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22491/document.

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Les Hydroxydes Doubles Lamellaires (HDL) sont des matériaux en couches à forte potentialité pour de nombreux domaines d’applications, cependant, leur caractère d’isolants électriques limite les possibilités d’applications en électrochimie. Il est donc intéressant de chercher des moyens d’améliorer leurs propriétés conductrices. Dans ce but, trois approches ont été envisagées : - l’insertion de cations de métaux de transition 3d dans les feuillets, - l’intercalation de médiateurs redox entre les feuillets ou - l’ajout de percolant électronique dans le système afin d’obtenir des HDL « électroact

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5

Touati, Souad. "Elaboration d'aérogels d'hydroxydes doubles lamellaires et de bionanocomposites à base d'alginate." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-00975932.

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Cette thèse présente un travail sur l'obtention d'aérogels d'HDL par séchage en conditions CO2 supercritique et l'élaboration de nouveaux bionanocomposites formés par la coprécipitation d'hydroxydes doubles lamellaire (HDL) dans l'espace confiné des billes d'alginate. Grâce à la combinaison d'une synthèse par coprécipitation Flash et d'un séchage en conditions supercritiques au CO2, des aérogels d'HDL possédant des surfaces spécifiques élevées sont élaborés. Parallèlement, l'alginate est utilisé comme une matrice de confinement pour la précipitation inorganique d'HDL. D'une part, les billes d'

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6

Di, Bitetto Arnaud. "Étude structurale et dynamique d’hydroxydes doubles lamellaires : du matériau carbonaté aux hybrides organo-minéraux." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0191/document.

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Ce travail de thèse s’articule autour de la synthèse et de la caractérisation d’hydroxydes doubles lamellaires (HDLs) par une approche combinant spectroscopie vibrationnelle, RMN du solide et diffraction des rayons X. Les objectifs portent sur la description de la distribution cationique dans les feuillets ainsi que sur l’étude des propriétés structurales et dynamiques des espèces interfoliaires. Les investigations sont principalement menées pour des HDLs de type MgII/AlIII (ratio compris entre 2 et 4) avec une complexification progressive des espèces intercalées : de l’anion carbonate pour le

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7

Lainé, Maxime. "Etude du comportement de matériaux argileux sous rayonnement ionisant." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS192/document.

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Le but de ce travail de thèse est d’étudier et de rationaliser, à l’aide de mécanismes réactionnels, le comportement sous irradiation de différents matériaux argileux. Les systèmes d’intérêt ont d’abord été le talc synthétique, qui est le prototype d’un matériau non gonflant. Sous irradiation par des électrons accélérés, la production de dihydrogène dans ce système, uniquement due aux groupes hydroxyle de surface, est du même ordre de grandeur que celle obtenue dans l’eau liquide. Ce rendement est divisé par 30 dans le cas du talc naturel de Luzenac, mettant ainsi en évidence l’importance des

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8

Grégoire, Brian. "Relation Composition-Structure des Hydroxydes Doubles Lamellaires : Effets de la charge du feuillet et de la nature de l'anion interfoliaire." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0154/document.

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Ce travail de thèse s'intéresse à la relation entre la composition des phases Hydroxydes Doubles Lamellaires (HDL) et leurs propriétés structurales. La première partie de ce manuscrit est consacrée à la formation et aux propriétés structurales de ces matériaux. L'effet de la nature des cations (MgII, NiII, CoII ; AlIII, FeIII) et de leur stoechiométrie dans le feuillet (MII/MIII E [2 ; 10]) constitue les axes principaux de ces travaux. L'étude du comportement hydrolytique d'un mélange de cations divalents et trivalents en fonction de leurs proportions en solution a permis de proposer un mécani

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9

Faour, Azzam. "Relation entre synthèse, microstructure et propriétés électrochimiques d'hydroxydes doubles lamellaires (HDL)." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00822128.

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Ce travail est consacré à la synthèse de phases d'Hydroxydes Doubles Lamellaire (HDL) [NiAl-CO32-] à morphologies contrôlées et à l'étude de la relation entre leurs propriétés structurales / microstructurales et leurs propriétés électrochimiques. Les phases HDL sont préparées par un nouveau procédé de synthèse, basé sur un traitement hydrothermal en présence d'acides aminés. Nous avons mis en évidence l'influence de plusieurs paramètres de synthèse tels que la quantité d'acide aminé, la concentration de sels métalliques, le pH du milieu ainsi que la température et le temps du traitement hydrot

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10

Polexe, Ramona Cristina. "Développement et caractérisation de nouveaux systèmes hybrides inorganique/organique pour la formulation de principes actifs." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20144/document.

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Le sujet de cette thèse consiste à formuler et caractériser de nouveaux matériaux hybrides inorganique/organique pour la formulation et la libération de principes actifs. Ces matériaux sont constitués soit par des hydroxydes doubles lamellaires (HDL) et des phospholipides (PL) soit par des hydroxydes doubles lamellaires et du chitosane. Les matériaux hybrides hydroxydes doubles lamellaires/phospholipides ont été obtenus par échange anionique entre les anions du feuillet d'HDL et les phospholipides chargés négativement sous forme de liposomes. Les techniques d'analyse utilisées (DRX, ATG, UV et

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11

Touisni, Nadia. "Développement de biocapteurs ampérométriques pour la détermination de l’activité de la transcétolase et pour la détection d’inhibiteurs de cette enzyme." Thesis, Clermont-Ferrand 2, 2013. http://www.theses.fr/2013CLF22416/document.

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Depuis peu, des travaux ont montré que chez l’Homme, la transcétolase (TK, EC 2.2.1.1.) dont le cofacteur est la thiamine diphosphate (forme active de la vitamine B1), est une enzyme impliquée dans de nombreuses maladies telles que, le diabète, certains cancers, ou encore des maladies neurologiques, comme le syndrome de Wernicke-Korsakoff et la maladie d’Alzheimer. Pour des applications thérapeutiques, des inhibiteurs spécifiques de cette enzyme sont actuellement conçus et synthétisés dans les milieux académiques et industriels. Afin de déterminer l’activité de la TK (dans un but de diagnostic

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12

Mahdi, Rima. "Nouveaux matériaux biohybrides multifonctionnels pour la biocatalyse." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22648/document.

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Ces travaux de thèse pluridisciplinaires à l‘interface entre biocatalyse et nanomatériaux visent la conception de matériaux biohybrides innovants par assemblage dans des conditions douces de matériaux inorganiques de type hydroxydes doubles lamellaires (HDL) avec des enzymes. La première partie de ce mémoire est consacrée à la caractérisation des interactions physico-chimiques entre les HDL et la fructose-6-phosphate aldolase (FSA) catalysant la formation stéréosélective de liaisons C-C pour conduire à des polyols chiraux. Les structures lamellaires HDL permettent un confinement efficace de sy

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13

Chisem, Ian. "Modified layered double hydroxides." Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/272599.

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14

Zhao, Jingxian. "Studies of Layered Double Hydroxides." Thesis, University of North Texas, 1995. https://digital.library.unt.edu/ark:/67531/metadc332491/.

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This work concerns some synthetic processes and basic properties of layered double hydroxides (LDHs). A series of LDHs, a family of newly developed materials found to have many potential uses in industry, were investigated in relating to the origin of life on early Earth. In this work, I successfully intercalated some inorganic as well as organic species. Ammonium, accompanied with ferrocyanide ion, can enter the layered space. It was found there were two kin go f intercalated ferrocyanide species: one is that exchanged with anions and became a part of layered double hydroxide, while the other

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15

Alves, Aline Ara?jo. "Hidr?xidos duplos lamelares aplicados ? obten??o de biodiesel." Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17606.

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Made available in DSpace on 2014-12-17T15:41:45Z (GMT). No. of bitstreams: 1 AlineAApdf.pdf: 2403213 bytes, checksum: dfc50c5f35575298ed9005c5d3fb4f7b (MD5) Previous issue date: 2009-08-14<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>In this paper, the Layered Double Hydroxides (LDH s) type hydrotalcite were synthesized, characterized and tested as basic heterogeneous catalysts for the production of biodiesel by transesterification of sunflower oil with methanol. The synthesis of materials Layered Double Hydroxides (LDH s) by co-precipitation method from nitrates of magn

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16

Brister, Brian. "Layered Double Hydroxides and the Origins of Life on Earth." Thesis, University of North Texas, 2001. https://digital.library.unt.edu/ark:/67531/metadc2766/.

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A brief introduction to the current state of research in the Origins of Life field is given in Part I of this work. Part II covers original research performed by the author and co-workers. Layered Double Hydroxide (LDH) systems are anion-exchanging clays that have the general formula M(II)xM(III)(OH)(2x+2)Y, where M(II) and M(III) are any divalent and trivalent metals, respectively. Y can be nearly any anion, although modern naturally occuring LDH systems incorporate carbonate (CO32-), chloride (Cl-), or sulfate (SO42-) anions. Intercalated cobalticyanide anion shows a small yet observable dev

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17

Fisher, Henry Alexander. "Pharmaceutical applications of layered double hydroxides." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:f2a4490d-c3f6-4953-b994-06a5d191dc98.

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The principle aims of this thesis are to investigate the synthesis of layered double hydroxides (LDHs) for use as drug delivery systems, and to explore the potential of these compounds to provide solutions to typical pharmaceutical problems. In Chapter 1, background information on pharmaceutics and drug delivery is given. LDHs are introduced and their structure, synthesis and general applications described. The biomedical and pharmaceutical applications of LDHs are reviewed. Chapter 2 presents the intercalation of the GABAergic drugs gabapentin and pregabalin into an LDH using the coassembly m

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18

Ruengkajorn, Kanittika. "Layered double hydroxides for packaging applications." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:5ed4c8a0-8dff-449d-a4f2-1ad482181659.

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The primary aim of this thesis is to synthesise and modify layered double hydroxides (LDHs) for using in packaging applications. <b>Chapter One</b> provides an introduction of the basic manufacturing process of paper-based and flexible packaging and the relevant aspects of using inorganic materials in packaging materials. The principles of gas permeation and the role of two-dimensional platelets on the concept of a tortuous pathway are reviewed. In addition, the structure, synthesis methods and applications of LDHs are presented. <b>Chapter Two</b> details the synthesis of LDH/cellulose fibre

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19

Richardson, Mickey Charles. "Layered Double Hydroxides as Anion- and Cation-Exchanging Materials." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3623/.

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Layered double hydroxides (LDH) have been principally known as anion-exchanging, clay-like materials for several decades, and continues to be the main driving force for current and future research. The chemical interactions of LDH, with transition metallocyanides, have been a popular topic of investigation for many years, partly due to the use of powder x-ray diffraction and infrared spectroscopy as the main characterization tools. Each transition metallocyanide has a characteristic infrared stretching frequency that can be easily observed, and their respective sizes can be observed while inte

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20

Boclair, Joseph W. (Joseph Walter). "Thermodynamic and Structural Studies of Layered Double Hydroxides." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc278144/.

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The preparation of layered double hydroxides via titration with sodium hydroxide was thoroughly investigated for a number of M(II)/M(III) combinations. These titration curves were examined and used to calculate nominal solubility product constants and other thermodynamic quantities for the various LDH chloride systems.

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21

Khan, Aamir I. "Novel intercalation chemistry of layered double hydroxides." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413071.

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22

Kagunya, Winnie Wambui. "Layered double hydroxides and their catalytic applications." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317800.

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23

Cenacchi, Pereira Ana Maria. "Synthèse de particules composites anisotropes polymère / inorganique par polymérisation RAFT en émulsion." Phd thesis, Université Claude Bernard - Lyon I, 2014. http://tel.archives-ouvertes.fr/tel-01067453.

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Ces travaux décrivent l'élaboration de latex hybrides de polymère / nanotubes d'Imogolite et polymère / nanofeuillets d'hydroxydes doubles lamellaires (HDL) en milieu aqueux dispersé. Les deux charges inorganiques ont été choisies pour leurs propriétés thermiques, mécaniques et pour leur anisotropie de forme, ce qui pourrait permettre l'élaboration de films nanostructurés. Les latex ont été synthétisés par une stratégie originale basée sur le procédé de polymérisation RAFT en émulsion. Cette stratégie consiste à utiliser des copolymères hydrophiles (macroRAFT), comportant à la fois des unités

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24

Wang, Chengle. "Controlled synthesis and properties of layered double hydroxides." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:80fc02cc-3e79-438f-9985-ae1663fc5554.

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The aims of this thesis are concerned with the synthesis of layered double hydroxide nanoparticles with controlled morphology and particle size distribution and an investigation of their physical properties. An introduction of layer double hydroxide chemistry, especially existing synthetic approaches, is reviewed in Chapter 1. Structural investigations, characterisation techniques, the properties and the applications of LDHs are discussed consecutively. The first successful synthesis of lithium aluminium nanorods using the hydrothermal treatment of a gibbsite precursor with a rod-like morpholo

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25

Park, In Yong. "Preparations of layered double hydroxides and their properties /." Electronic version of summary, 1990. http://www.wul.waseda.ac.jp/gakui/gaiyo/1635.pdf.

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26

Nhlapo, Nontete Suzan. "Intercalation of fatty acids into layered double hydroxides." Pretoria : [s. n.], 2008. http://upetd.up.ac.za/thesis/available/etd-10022009-193152.

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27

Buckley, Hannah C. "Applications of layered double hydroxides as inorganic adjuvants." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:353bd7f3-89ed-4392-9b71-64a27c271522.

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The primary aim of this thesis is to explore the immunostimulatory properties of a family of layered, crystalline, inorganic materials known as layered double hydroxides (LDHs). <strong>Chapter One</strong> provides an introduction to relevant aspects of the immune system, and the context for investigating the immunostimulatory properties of inorganic materials in terms of vaccine/adjuvant formulations. The possible mechanisms of action of commercial adjuvant materials are also reviewed, and the structure, synthesis methods and applications of LDHs are discussed. <strong>Chapter Two</strong> d

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28

Nhlapo, N. S. (Nontete Suzan). "Intercalation of fatty acids into layered double hydroxides." Diss., University of Pretoria, 2008. http://hdl.handle.net/2263/28361.

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Surfactant-mediated intercalation of aliphatic fatty acids into a commercial,layered double hydroxide (LDH) with the approximate composition of [Mg0.689Al0.311(OH2)] (CO3)0.1569nH2O was explored. The reactions were conducted at elevated temperatures with the LDH powder suspended in a fatty acid oil-water emulsion. The acidic fatty acid, e.g. stearic acid, reacts with the basic carbonate anions from LDH-CO3. In the process, CO2 is released as a gas and the fatty acids are intercalated as a bilayer. A high concentration of anionic or non-ionic surfactants, i.e. sodium dodecylsulphate or Tween 60

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29

Wang, Zhiming 1958. "Anion Exchange and Competition in Layered Double Hydroxides." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc332481/.

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Exchange reactions of anions, especially ferrocyanide and carbonate, with layered double hydroxides (LDHs) were investigated in relation to the origin of life on the early Earth. The effect on ferrocyanide exchange of concentration, pH, reaction time and cations are discussed. It was found that there were two different kinds of ferrocyanide species: one was that intercalated into the layered structure, occupying a site of D symmetry within the LDHs, while in the other, the ferrocyanide group retains full O symmetry. In addition, very low concentration, ferrocyanide associated with LDH will cha

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30

Royeppen, Mikhail David. "Modified layered double hydroxides as PVC heat stabilisers." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/62806.

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Hydrotalcite (HTC) was intercalated with different aromatic carboxylic acids via two synthesis methods: reconstruction and co-precipitation. The reconstruction method involves the rehydration of the products of LDH calcination. The co-precipitation method involves the addition of a base to solutions containing a mixture of the MII and MIII ions found in the metallic layers of an LDH. The intercalated compounds were then compounded with flexible grade PVC to see if these compounds had any effect on the heat stability of the PVC. Complete intercalation of these stabilisers did not occur; however

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31

Robins, Daniel Swaim. "Studies of molecularly designed layered double metal hydroxides /." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487854314870167.

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32

Jakupca, Michael R. "Characterization and application of layered double metal hydroxides /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487863429096234.

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33

Griffiths, Hannah. "Layered double hydroxides : structure, synthesis and catalytic applications." Thesis, University of Huddersfield, 2012. http://eprints.hud.ac.uk/id/eprint/17494/.

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The objective of the work studied here was to relate the structure of the conventional Layered Double Hydroxide (LDH), hydrotalcite and several transition metal doped hydrotalcites to their function once calcined into catalysts for use in the production of biodiesel. Attention was paid to the preparation of the LDHs. Three preparative methods were investigated, using sodium hydroxide and carbonate, using ammonia, and using urea as precipitating agents. The properties of the resultant LDHs and those of the mixed oxides produced on calcination were shown to be relatively independent of the synth

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34

Markland, Charles Ivor. "Novel aspects of layered double hydroxide chemistry." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:a3494026-6f43-4696-9ff4-7e3040fe7958.

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A number of different aspects of the chemistry of layered double hydroxides and similar materials have been explored in this thesis. The intercalation chemistry of these compounds, in both aqueous and mixed solutions, has been explored to synthesise over forty new hybrid layered materials by ion-exchange and rehydration-reconstruction methods. The host used include both previously-reported layered hydroxide compounds, and novel host materials synthesised by the extension of heterogeneous reactions of solid oxides. The synthesis of these novel materials provides insights into the factors that c

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35

Richardson, Mickey Charles Braterman Paul S. "Layered double hydroxides as anion- and cation-exchanging materials." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3623.

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36

Ragavan, Anusha. "Novel intercalates of layered double hydroxides towards advanced applications." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436990.

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37

Vucelic, Morana. "The structure and dynamics of organic layered double hydroxides." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363119.

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38

Iqbal, Muhammad Ahsan. "Layered double hydroxide based smart protective coating systems." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/302211.

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Corrosion protection of aluminum and its alloys is a challenging subject to widen the service life of material and its industrial usage. Numerous protective measures have been employed for the corrosion protection of aluminum alloys. Chromate based coatings system was in use for a long time to protect the light metals alloys, but after the ban on Chromates based coating (2017) in European Union due to strict health and safety rules and regulations, there is a need to develop environmentally friendly, greener coating systems to functionalize aluminum surface and to provide sufficient chemical a

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39

Ambadapadi, Sriram Braterman Paul S. "Study of substituted benzenesulfonate-containing layered double hydroxides and investigation of the hexamethylenetetramine route of LDH synthesis." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3709.

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40

Kahl, Michael S. "Electrochemical Synthesis and Applications of Layered Double Hydroxides and Derivatives." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804917/.

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Layered double hydroxides (LDH) are a class of anionic clay with alternating layers of positive and negative charge. A metal hydroxide layer with divalent and trivalent metals with a positive charge is complemented by an interlayer region containing anions and water with a negative charge. The anions can be exchanged under favorable conditions. Hydrotalcite (Mg6Al2(OH)16[CO3]·4H2O) and other variations are naturally occurring minerals. Synthetic LDH can be prepared as a powder or film by numerous methods. Synthetic LDH is used in electrode materials, adsorbents, nuclear waste treatment, drug d

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41

Halcom-Yarberry, Faith Marie. "Layered Double Hydroxides: Morphology, Interlayer Anion, and the Origins of Life." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3286/.

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The preparation of layered double hydroxides via co-precipitation of a divalent/trivalent metal solution against a base results in 1 mm LDH particles with a disorganized metal lattice. Research was performed to address these morphological issues using techniques such as Ostwald ripening and precipitation via aluminate. Another interesting issue in layered double hydroxide materials is the uptake and orientation of anions into the interlayer. Questions about iron cyanide interlayer anions have been posed. Fourier transform infared spectroscopy and powder x-ray diffraction have been used to inve

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42

Pérez, Barrado Elena. "Layered double hydroxides for applications in catalysis and electroluminescent devices." Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/285961.

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La motivació d'aquesta tesi és l'aplicació de hidròxids dobles laminars (HDLs) en els camps de la catàlisi heterogènia, composite & síntesi de materials híbrids i per el muntatge de dispositius LED (light-emitting diode). La reacció catalítica estudiada en aquest treball es la eterificació de glicerol a poliglicerols de cadena curta fent servir MgAl i CaAl hidròxids dobles laminars (MgAl-HDLs i CaAl-HDLs, respectivament). Per estudiar l'efecte de la temperatura de calcinació en l'activitat catalítica, una mostra es va calcinar a més altes temperatures. El comportament catalític es va correlaci

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43

Pillinger, Martyn. "EXAFS studies of polyoxometalates and polyoxometalate-pillared layered double hydroxides." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240624.

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44

Kottegoda, Mahavithanage Nilwala Svetlana. "Synthesis and exfoliation of layered double hydroxides : characterisation and applications." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613738.

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45

Thyveetil, Mary-Ann. "Large-scale simulations of layered double hydroxide nanocomposite materials." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/16745/.

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Layered double hydroxides (LDHs) have generated a large amount of interest in recent years due to their ability to intercalate a multitude of anionic species. Atomistic simulation techniques such as molecular dynamics have provided considerable insight into the behaviour of these materials. The advent of supercomputing grids allows us to explore larger scale models with considerable ease. In this thesis we present our findings from large scale molecular dynamics simulations of Mg_2AI-LDHs intercalated with either chloride ions or a mixture of DNA and chloride ions. The system exhibits emergent

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46

Nhlapo, N. S. (Nontete Suzan). "Intercalation of fatty acids in a layered double hydroxide." Diss., University of Pretoria, 2004. http://hdl.handle.net/2263/28361.

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Surfactant-mediated intercalation of aliphatic fatty acids into a commercial,layered double hydroxide (LDH) with the approximate composition of [Mg0.689Al0.311(OH2)] (CO3)0.1569nH2O was explored. The reactions were conducted at elevated temperatures with the LDH powder suspended in a fatty acid oil-water emulsion. The acidic fatty acid, e.g. stearic acid, reacts with the basic carbonate anions from LDH-CO3. In the process, CO2 is released as a gas and the fatty acids are intercalated as a bilayer. A high concentration of anionic or non-ionic surfactants, i.e. sodium dodecylsulphate or Tween 60

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47

Brister, Fang Wei. "Layered Double Hydroxides: Synthesis, Characterization, and Interaction of Mg-Al Systems with Intercalated Tetracyanonickelate(II)." Thesis, University of North Texas, 2004. https://digital.library.unt.edu/ark:/67531/metadc4636/.

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The square-planar tetracyanonickelate(II) anion was intercalated into 2:1 and 3:1 Mg-Al layered double hydroxide systems (LDHs). In the 2:1 material, the anion holds itself at an angle of about 30° to the layers, whereas in the 3:1 material it lies more or less parallel to the layers. This is confirmed by orientation effects in the infrared spectra of the intercalated materials and by X-ray diffraction (XRD) data. The measured basal spacings for the intercalated LDH hosts are approximately 11 Å for the 2:1 and approximately 8 Å for the 3:1. The IR of the 2:1 material shows a slight splitti

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48

Shinall, Brian Darnell. "The use of layered double hydroxides as adsorbents for carbon dioxide." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/10156.

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49

Wong, Fariaty. "Application of Layered Double Hydroxides as Corrosion Sensing Pigments in Coatings." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1409148507.

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Feng, Yongjun. "Formation and properties of second-stage layered double hydroxide materials." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2006. http://tel.archives-ouvertes.fr/tel-00717376.

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L'objectif de ce travail est de progresser dans la compréhension du mécanisme de la réaction d'échange pour les phases Hydroxydes Doubles Lamellaires (HDL). Ainsi, les propriétés d'échange des phases Zn2Cr et Zn2Al ont été examinées pour différents anions inorganiques (Cl-, F-, CO32-,SO42-, Fe(CN)63- et organiques (tartrate, succinate, adipate, styréne-4-sulfonate). Ces échanges ont été suivis par diffraction des rayons X en dispersion d'énergie (EDXRD : Energy Dispersive X-ray Diffraction) utilisant le rayonnement synchrotron. Cette technique compatible avec une étude structurale en solution

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