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Dissertations / Theses on the topic 'Layered double hydroxide systems'

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Published: 4 June 2021

Last updated: 2 February 2022

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1

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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2

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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3

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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4

Djebbi, Mohamed Amine. "Les Hydroxydes Doubles Lamellaires au coeur de la biotechnologie : évaluation des applications médicales et environnementales." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1049/document.

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Les matériaux hydroxydes doubles lamellaires (HDL) sont une classe d'argiles anioniques synthétiques dont la structure est basée sur celle du brucite Mg(OH)2 dans lesquelles une partie des cations métalliques divalents sont été remplacés par des ions trivalents donnant ainsi des feuillets chargés positive. Cette charge est équilibrée par l'intercalation d'anions dans la région interlamellaire hydratée. Les identités et les rapports des cations di- et trivalents et l'anion interlamellaire peuvent être varié sur une large gamme, donnant lieu à une large classe de matériaux isostructurales. Le ma

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5

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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6

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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7

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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8

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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9

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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10

Greenwell, H. C. "Organo-layered double hydroxide materials : new synthetic routes and computer simulation." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599674.

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The recent increase in use of layered inorganic/organic hybrid materials as solid base catalysts, novel composite materials, and pharmaceutics has resulted in considerable interest in the design, synthesis and understanding of these systems. Layered double hydroxides (LDHs) are often used in the preparation of hybrid materials. Environmentally attractive synthetic routes are studied for the synthesis of MgAl-LDHs incorporating a series of organic dicarboxylate anions (malonate, succinate, glutarate and adipate). The reaction conditions are systematically explored to ascertain the effect of aci

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11

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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12

Hickey, J. P. "In situ synthesis, study and characterisation of polymer-layered double hydroxide nanocomposites." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603994.

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The work described, explores the <i>in situ </i>synthesis of layered double hydroxide (LDH) - polymer nanocomposites by the free radical polymerisation of a variety of methacrylate monomers and styrene. Dividing the developed <i>in situ </i>methodology into two stages, LDH / monomer dispersion and dispersion polymerisation, the factors affecting nanocomposite formation were investigated. Chapter two details the synthesis and study of various Mg / Al and Mg / Fe containing LDHs, prepared using co-precipitation and direct anion exchange methodologies. Particular attention was given to be organic

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13

Ogbomo, Sunny Minister D'Souza Nandika Anne. "Processing, structure property relationships in polymer layer double hydroxide multifunctional nanocomposites." [Denton, Tex.] : University of North Texas, 2009. http://digital.library.unt.edu/ark:/67531/metadc12174.

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14

Costa, Francis Reny. "Mg-Al Layered Double Hydroxide: A Potential Nanofiller and Flame-Retardant for Polyethylene." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1195481811992-27563.

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The presented research report deals with the investigation of magnesium aluminum based layered double hydroxide (LDH) as a potential nanofiller and flame-retardant for polymers with special reference to polyethylene. LDH is a mixed hydroxide of di- and trivalent metal ions that crystallizes in the form of mineral brucite. The basic reason for selecting LDH or more specifically magnesium-aluminum based LDH (Mg-Al LDH) is their typical metal hydroxide-like chemistry and conventional clay-like layered crystalline structure. The former is helpful in the direct participation in flame inhibition thr

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15

Ashekuzzaman, S. H. "Removal of phosphorus and arsenic oxyanions from water using layered double hydroxide adsorbent." Thesis, Glasgow Caledonian University, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.726751.

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16

Wongariyakawee, Anchalee. "Novel layered double hydroxide chemistry for application in cement and other building materials." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:3670c777-c860-43a8-9cdc-5a7d2c87b71b.

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The investigation into the syntheses and the intercalations of LDHs is the focus of the work described in this thesis. An introduction to Layered Double Hydroxide (LDH) materials with an emphasis on the possible host lattices and to their applications is given in <strong>Chapter 1</strong>. The application of LDHs in cement including; history of cement, cement production process, and cement hydration is detailed. The synthesis of the Ga-doped Ca<sub>2</sub>Al(OH)<sub>6</sub>Cl•nH<sub>2</sub>O LDHs (Ca<sub>2</sub>Ga<sub>x</sub>Al<sub>(1–x)</sub>-Cl; where 0 < x < 1) via the co-precipitation met

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17

Kosuri, Divya. "Polyethylene-layered double hydroxide and montmorillonite nanocomposites: Thermal, mechanical and flame retardance properties." Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc6087/.

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The effect of incorporation two clays; layered double hydroxides (LDH) and montmorillonite layered silicates (MLS) in linear low density polyethylene (PE) matrix was investigated. MLS and LDH were added of 5, 15, 30 and 60 weight percent in the PE and compounded using a Brabender. Ground pellets were subsequently compression molded. Dispersion of the clays was analyzed using optical microscopy, SEM and XRD. Both the layered clays were immiscible with the PE matrix and agglomerates formed with increased clay concentration. The thermal properties were studied by differential scanning calorimetry

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18

Carlino, Simon. "An investigation into some of the properties of a hydrotalcite-like layered double hydroxide." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387022.

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19

Weir, Mark Robert. "Synthesis, characterization and catalytic testing of layered double hydroxide materials pillared by heteropoly oxometalate anions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ34709.pdf.

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20

Baki, Musa. "Molecular simulation, application, synthesis and characterization of layered double hydroxide in search of anionic clays." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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21

Torres, Dorante Luis Omar. "Evaluation of a layered double hydroxide (LDH) mineral as a long-term nitrate exchanger in soil." Göttingen Cuvillier, 2007. http://d-nb.info/985618248/04.

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22

Clark, Ian. "Continuous synthesis and characterisation of layered double hydroxide nanomaterials for their application for dye wastewater remediation." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52758/.

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The first part of this research was aimed to improve continuous synthesis of LDHs through a matrix of experiments that investigated the influence of key factors affecting synthesis. These factors; temperature, pressure and reactant concentration were investigated for Ca2Al-NO3 LDHs. Alteration of reaction temperature and pressure caused changes to crystal domain length (CDL). As temperature was increased, tune-ability through pressure manipulation was lessened. The effect of the NaOH concentration in the precipitation reaction was found to have an impact on CDL. The highest NaOH concentration

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23

Hu, Gang. "Syntheses and characterization of novel layered double hydroxide structures and the development of LDH/Polymer nanocomposites." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487258.

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The syntheses of layered double hydroxides (LDHs) with novel structures, and the development of LDHlPolymer nanocomposites, are the focus of the work described in this thesis. A general introduction to the synthetic methods, structural properties, and established application~ of LDH materials is given in Chapter 1. The emerging application of LDH in polymer-based nanocomposites, some present obstacles in LDH/polymer nanocomposites R&D, and the possible solutions are also discussed. LDH materials are conventionally prepared using a co-precipitation method. Chapter 2 reports a very facile method

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24

Moyo, Lumbidzani. "Fatty acid intercalated layered double hydroxides as additives for Jojoba oil and polymer matrices." Thesis, University of Pretoria, 2012. http://hdl.handle.net/2263/25462.

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Fatty acid intercalated layered double hydroxides were used as additives for Jojoba oil and polymer matrices. The first phase of the study was to intercalate carboxylic acids (C14 to C22). These were successfully intercalated into layered double hydroxides (LDHs), with the formula [Mg0.7Al0.3 (OH) 2](CO3)0. 15•0.5H2O. The one-pot synthesis consistently yielded a bilayer intercalated product for the range of acids employed. The intercalated anions had an orientation tilt angle of 55–63°, depending on the length of the fatty acid chain. However, there is an indication that the anion exchange pro

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25

Iguchi, Shoji. "Studies on Photocatalytic Conversion of CO2 in Water over Layered Double Hydroxides." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215566.

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26

Purohit, Purv [Verfasser], and Andreas [Akademischer Betreuer] Schönhals. "Characterization of Polymer Nanocomposites based on Layered Double Hydroxide and Carbon Nanotubes / Purv Purohit. Betreuer: Andreas Schönhals." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1029192871/34.

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27

Lima, Paulo DemÃtrios da Silva. "Textural properties study of Mg-Al layered double hydroxide with different molar ratios and upon hydrothermal treatments." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13527.

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Layered Double Hydroxide (LDH) belongs to a class of ceramic materials that present structure formed by stacked layers of double metals hydroxides and an anion into the lamellar space. They present a large variety of applications possibilities, as industrial, environment, medicine, among others. Non-calcined Mg-Al layered double hydroxide (LDH) with molar ratio, x = Al / (Mg + Al), 0.20, 0.25 and 0.30 were synthesized using co-precipitation method, followed by hydrothermal treatment at a fixed temperature 80ÂC and different aging from 2 to 35 days. The material obtained was characterized by XR

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28

Lima, Paulo Demétrios da Silva. "Textural properties study of Mg-Al layered double hydroxide with different molar ratios and upon hydrothermal treatments." reponame:Repositório Institucional da UFC, 2014. http://www.repositorio.ufc.br/handle/riufc/10730.

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LIMA, P. D. S. Textural properties study of Mg-Al layered double hydroxide with different molar ratios and upon hydrothermal treatments. 2014. 123 f. Tese (Doutorado em Engenharia e Ciência de Materiais) - Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2014.<br>Submitted by Marlene Sousa (mmarlene@ufc.br) on 2015-02-24T12:16:59Z No. of bitstreams: 1 2014_tese_pdslima.pdf: 6653793 bytes, checksum: d4bc22a60b0640fd067d93c56b0bfe85 (MD5)<br>Approved for entry into archive by Marlene Sousa(mmarlene@ufc.br) on 2015-02-24T14:39:58Z (GMT) No. of bitstreams: 1 2014_tese_pdslima.pdf

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29

Stimpfling, Thomas. "Modified layered double hydroxide (LDH) platelets as corrosion inhibitors reservoirs dispersed into coating for aluminun alloy 2024." Thesis, Clermont-Ferrand 2, 2011. http://www.theses.fr/2011CLF22169.

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L’alliage d’aluminium 2024 est très répandu dans l’industrie aéronautique et automobile. Le processus de corrosion peut entrainer des dommages irréversibles pouvant engendrer des issues fatales dans le domaine aéronautique. Ainsi plusieurs couches de revêtements sont déposées à la surface du métal à protéger pour prévenir le processus de corrosion. Depuis le début du 20ième siècle, le chrome hexavalent (CrVI) a été largement utilisé comme inhibiteur de corrosion dans les différentes couches du revêtement (prétraitement, primer et top-coat). La toxicité de ce composé envers l’homme et l’environ

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30

Ko, Sae Bom. "Identification of active agents for tetrachloroethylene degradation in Portland cement slurry containing ferrous iron." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3861.

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Fe(II)-based degradative solidification/stabilization (Fe(II)-DS/S) technology is the modification of conventional solidification/stabilization (S/S). Inorganic pollutants are immobilized by Fe(II)-DS/S while organic pollutants are destroyed. Experimental studies were conducted to identify the active agents for Tetrachloroethylene (PCE) degradation as well as the conditions that enhance the formation of the active agents in the Fe(II)-DS/S system. PCE was chosen as a model chlorinated aliphatic hydrocarbon in this study. First, the conditions that lead to maximizing production of the active ag

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31

Ogbomo, Sunny Minister. "Processing, structure property relationships in polymer layer double hydroxide multifunctional nanocomposites." Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc12174/.

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Dan Beaty (1937-2002) was a prolific composer, pianist, researcher, educator, and writer. His large compositional output included chamber works, choral works, songs, orchestral pieces, electronic music, and keyboard works. Beaty was well versed in traditional Western music as well as the more avant-garde and perplexing idioms of the twentieth century. Beaty's compositions reflect the many fascinating, if not always popular, musical trends of his time. His music encompasses styles from serial to jazz, shows compositional influences from Arnold Schoenberg to Indonesian music, and demonstrates

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32

Moyo, Lumbidzani. "A critical assessment of the methods for intercalating anionic surfactants in layered double hydroxides." Diss., University of Pretoria, 2009. http://hdl.handle.net/2263/29961.

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The intercalation of surfactant anions, namely sodium dodecyl sulphate, sodium benzene sulphonate and lauric acid, into commercial layered double hydroxides (LDH-CO3) with approximate composition [Mg0.654AI0.346 (OH)2](CO3)0.173.0.5H2O] was explored. LDH-CO3 is commercially available in bulk form owing to its large scale applications as a PVC stabiliser and acid scavenger in polyolefins. It is therefore of interest to investigate intercalation methods using LDH-CO3 as starting material. The intercalation method used was compared with the pre existing procedures, for instance the co-precipitati

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33

Phillips, Justin. "Dextrin nanocomposites and deep eutectic solvents as matrices for solid dosage forms." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/81724.

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Controlled-release formulations for pesticide applications act as depot systems that continuously release the active ingredients into the environment over a speci ed period, usually from months to years. However, some applications require fast-dissolving drug delivery. The interest of this research is in fast-release of water-insoluble pesticides into aquatic environments. This study considered the use of dextrin starch and urea eutectics as fast release, solid dosage carrier forms that contain an active ingredient. The chosen active for this study is an acaricide called amitraz (N-methy

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34

Purohit, Purv J. [Verfasser], Andreas [Gutachter] Schönhals, and Manfred H. [Gutachter] Wagner. "Characterization of Polymer Nanocomposites based on Layered Double Hydroxide and Carbon Nanotubes / Purv J. Purohit ; Gutachter: Andreas Schönhals, Manfred H. Wagner." Berlin : Bundesanstalt für Materialforschung und -prüfung (BAM), 2013. http://d-nb.info/1122740891/34.

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35

Zhou, Tianhao. "Development of a novel ion eluting copolymer network for osteogenic applications." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/development-of-a-novel-ion-eluting-copolymer-network-for-osteogenic-applications(b58d4681-4711-414b-8bec-15d6018bb9c3).html.

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The current clinical treatment for bone deficiencies in clinics includes autografts, allografts and bone graft substitutes. All these treatments, however, still have various limitations. Therefore, in this project, we aim to design, synthesise and characterise a new series of novel polymer networks (PNs) to promote bone formation and offer a new therapeutic solution. An innovative polymerisation technique was used to synthesise the novel polymer-based materials. Various lactone monomers were applied with layered double hydroxides (LDHs) as the initiator for the polymerisation. Copolymerisation

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36

Rizvi, Hussain R. "Bioinspired & biocompatible coatings of poly(butylene adipate-co-terephthalate) and layer double hydroxide composites for corrosion resistance." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849647/.

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Hierarchical arrangement of biological composites such as nacre and bone containing high filler (ceramic) content results in high strength and toughness of the natural material. In this study we mimic the design of layered bone microstructure and fabricate an optimal multifunctional bio-nanocomposite having strength, toughness and corrosion resistance. Poly (butylene adipate-co-terephthalate) (PBAT), a biodegradable polymer was used as a substrate material with the reinforcement of LDH (Layered double hydroxide) as a nanofiller in different concentrations to achieve enhancement in mechanical p

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Reis, Márcio José dos. "Estudo da adsorção de tensoativos aniônicos sulfonados em hidróxidos duplos lamelares." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-07122006-090742/.

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Hidróxidos duplos lamelares (HDL) ou compostos lamelares do tipo da hidrotalcita, são materiais com estrutura formada pelo empilhamento de camadas de hidróxidos mistos de cátions divalentes e trivalentes contendo ânions hidratados nos espaços entre essas camadas. Os HDL apresentam uma grande diversidade de aplicações podendo ser utilizados como catalisadores ou suporte para catalisadores, trocadores iônicos, antiácidos, adsorventes. A adsorção de tensoativos em interfaces sólido/líquido é um fenômeno amplamente estudado devido à sua relação direta com estabilidade de colóides. A adsorção de t

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Silva, Leonardo Paulo Ribeiro da. "Híbridos de hidróxidos duplos lamelares e herbicidas: intercalação, liberação e eficácia dos princípios ativos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-20022015-165232/.

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Praguicidas são substancias capazes de prevenir, destruir, repelir ou mitigar uma praga e por isso desempenham um papel de grande importância na agricultura moderna. A elevada utilização destes compostos visa atender à crescente demanda de produção de alimentos, e para isso pesquisas vem sendo realizadas para o desenvolvimento de novas formulações. Entretanto a utilização descontrolada destes compostos pode levar à contaminação de alimentos, solo, águas superficiais e subterrâneas. Os Hidróxidos Duplos Lamelares (HDL) ou argilas aniônicas apresentam estrutura lamelar na qual uma variedade de â

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Iglesias, Pérez Luis. "On the use of layered double hydroxides in the management of 129I from liquid nuclear wastes." Doctoral thesis, Universitat Rovira i Virgili, 2015. http://hdl.handle.net/10803/296435.

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El 129I està considerat un radionúclid perillós a causa del seu llarg temps de vida mitjana, la baixa interacció que presenta amb la majoria dels materials geològics i la seva rellevància biològica. L'activitat nuclear ha generat al voltant de 5068 kg de 129I, apareixent molt diluït en les deixalles aquoses de les centrals nuclears. Els hidròxids dobles laminars (HDLs) de Mg/Al han estat estudiats com materials adsorbents de iodur, fent proves amb diferents ràtios i diferents anions interlaminars. La capacitat d'adsorció es veu seriosament afectada per les propietats texturals del material, i

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Layrac, Géraldine. "Nanoparticules d’hydroxydes doubles lamellaires élaborées à partir de micelles complexes de copolymères hydrosolubles : Synthèse directe en milieu aqueux et étude de la croissance et de la stabilisation." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2017. http://www.theses.fr/2017ENCM0010.

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Ce travail concerne la préparation directe dans l’eau de nanoparticules colloïdales de HDL stables et peu agrégées utilisant des DHBC PAm-b-PAA ou PAm-b-PVPA constitués d’un bloc ionisable complexant poly(acide-acrylique) (PAA) ou poly(acide vinylphosphonique (PVPA) et d’un bloc neutre stabilisant poly(acrylamide) (PAm). La synthèse est en 2 étapes: i) complexation par le bloc anionique du DHBC des Mg2+ ou Cu 2+ et Al3+ donnant des micelles hybrides complexes de polyions (HPIC) ; ii) co-hydroxylation des cations à pH constant. Les DHBC sont préparés par polymérisation RAFT/MADIX à partir des m

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Langry, Arthur. "Evaluation of IN SITU synthesis route of layered hydroxides in the presence of amphiphilic polymers in comparison with their corresponding physical mixtures." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22603/document.

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L’originalité du manuscrit de thèse est basée sur une preuve de concept selon laquelle il peut être possible de générer IN SITU des matériaux plaquettaires au sein même d’une matrice polymère à renforcer. Cette approche est basée sur une nouvelle voie de préparation de matériaux hybrides à base d’hydroxydes lamellaires. Cette méthode combine une voie de synthèse par polyol et la génération IN SITU de plaquettes inorganiques, en présence d’oligomères BOLA à caractère amphiphile. La voie polyol consiste en l’hydrolyse en milieu alcoolique d’un ou de plusieurs sels acétate métalliques comme précu

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Kieke, Marc Dong Kil [Verfasser]. "On the degradation behavior of magnesium, magnesium hydroxide derived coatings and magnesium containing layered double hydroxides with regard to medical applications / Marc Dong Kil Kieke." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2015. http://d-nb.info/1073605248/34.

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Ganiyu, Soliu. "Electrochemical Advanced Oxidation Processes for removal of Pharmaceuticals from water : Performance studies for sub-stoichiometric titanium oxide anode and hierarchical layered double hydroxide modified carbon felt cathode." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1116/document.

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AbstractLes polluants émergents que sont les résidus de produits pharmaceutiques sont devenus une problématique majeure de par leur persistance et leur accumulation continue dans les différents compartiments de l’environnement. Leur élimination est un des challenges majeurs de ce siècle. Les procédés électrochimiques d’oxydation avancée (PEOA) tel que l’oxydation anodique (AO) et l’électro-Fenton (EF) ont démontré leur efficacité pour la dégradation et la minéralisation complète de cette classe de polluant. Un oxyde de titane sous-stœchiométrique déposé par plasma sur un alliage de titane a ét

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Darmograi, Ganna. "Etude thermodynamique et structurale des mécanismes de rétention compétitive des colorants azoïques et d'anions inorganiques à l'interface solide-liquide sur des matériaux modèles de type oxydes, lamellaires et échangeurs organiques." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS015/document.

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La présence combinée de différents types de polluants dans les effluents industriels est une problématique assez complexe à résoudre pour les chercheurs dans le domaine de la protection de l'environnement. Dans ce contexte, le principal objectif de ce travail de thèse a été d'améliorer la compréhension des mécanismes de sorption à l'interface solide liquide, processus impliqués dans la rétention compétitive pour une sélection de colorants organiques et d'espèces inorganiques sur des matériaux adsorbants modèles. Ce manuscrit comprend une étude détaillée de l'adsorption combinant différentes ap

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Klemkaitė-Ramanauskė, Kristina. "Mg/Al, Co/Mg/Al ir Ni/Mg/Al sluoksniuotų dvigubų hidroksidų sintezė, modifikavimas ir apibūdinimas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121227_090725-77074.

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Trijų sudėčių sluoksniuoti dvigubi hidroksidai (SDH) Mg/Al, Co/Mg/Al ir Ni/Mg/Al susintetinti bendro nusodinimo esant mažoms koncentracijoms metodu. Šie SDH buvo termiškai suskaidyti, ir gautieji mišrūs metalų oksidai reformuoti vandenyje ir pirmą kartą magnio nitrato tirpale. Naudojant XRF ir TG duomenis pasiūlytos susintetintų bendro nusodinimo metodu SDH formulės. XRD analizės rezultatai parodė, kad SDH ir mišrių metalų oksidų faziniai kitimai reformavimo metu priklauso nuo proceso temperatūros ir terpės prigimties. Co ir Ni turinčių SDH mėginių sluoksninės struktūros atstatymas kambario te

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Botan, Rodrigo 1982. "Síntese e caracterização de nanocompósitos de poli(estireno) com materiais lamelares - hidróxido duplo lamelar e hidroxissal lamelar - via polimerização in situ." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266127.

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Orientador: Liliane Maria Ferrareso Lona<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-24T08:44:00Z (GMT). No. of bitstreams: 1 Botan_Rodrigo_D.pdf: 8541673 bytes, checksum: fc88cab0852acd3cb9bf0b6052e4458d (MD5) Previous issue date: 2014<br>Resumo: Ao longo da última década, nanocompósitos poliméricos vêm atraindo grande atenção da comunidade científica e industrial. Este fato se deve à notável melhora em inúmeras propriedades destes novos materiais, proporcionado pelo uso de uma pequena quantidade de nanorefo

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Aguiar, JosÃ EurÃnio de. "RemoÃÃo de corantes tÃxteis utilizando adsorventes nanoporosos." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8963.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Os corantes sintÃticos sÃo um dos poluentes mais comuns e frequentemente encontrados na indÃstria tÃxtil. A destinaÃÃo de esgoto contendo corantes para corpos de Ãgua Ã extremamente importante do ponto de vista ambiental, jÃ que mesmo em baixas concentraÃÃes os corantes podem ser altamente tÃxicos para sistemas aquÃticos. A elevada toxicidade Ã um dos grandes problemas de Ãguas residuais contendo corantes. Este estudo examinou como adsorventes nanoporosos trÃs materiais sendo um HidrÃxido Duplo Lamelar (HDL â Mg/Al), uma argila pil

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FERNANDES, JÚNIOR Antonio de Jesus dos Santos. "ESTUDO DE MATERIAIS HETEROESTRUTURADOS FUNCIONAIS À BASE DE HIDRÓXIDOS DUPLOS LAMELARES SUPORTADOS EM SILICATO LAMELAR." Universidade Federal do Maranhão, 2017. https://tedebc.ufma.br/jspui/handle/tede/tede/1992.

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Submitted by Maria Aparecida (cidazen@gmail.com) on 2017-11-16T12:37:19Z No. of bitstreams: 1 ANTONIO DE JESUS DOS SANTOS FERNANDES JÚNIOR.pdf: 2676930 bytes, checksum: 6ea43214cce79a1ebadd7cae50663205 (MD5)<br>Made available in DSpace on 2017-11-16T12:37:19Z (GMT). No. of bitstreams: 1 ANTONIO DE JESUS DOS SANTOS FERNANDES JÚNIOR.pdf: 2676930 bytes, checksum: 6ea43214cce79a1ebadd7cae50663205 (MD5) Previous issue date: 2017-09-05<br>In this work,a nevel material heterostructured based on the assembly of double layered double hydroxide (LDH) suported in magadiite, was synthesized. For this p

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Forte, Marcus Bruno Soares 1980. "Estudo da adsorção de ácido clavulânico em hidróxidos duplos lamelares = cinética, equilíbrio e modelagem matemática = Clavulanic acid adsorption studies in layered double hydroxides: kinetics, equilibrium and mathematical modeling." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256564.

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Orientadores: Francisco Maugeri Filho, Maria Isabel Rodrigues<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-21T20:28:07Z (GMT). No. of bitstreams: 1 Forte_MarcusBrunoSoares_D.pdf: 4684118 bytes, checksum: 7ad3d65f4a3a6f6e525b286c594a4a22 (MD5) Previous issue date: 2013<br>Resumo: A proposta desta tese foi o estudo da adsorção do ácido clavulânico (CA) em hidróxidos duplos lamelares (LDH) e o uso desses adsorventes em colunas de leito fixo na separação entre o CA e aminoácidos. A tese foi desenvolvida em tr

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Miranda, Joana Maia. "Synthesis, characterization and performance evaluation of nanostructured additives with anti-corrosive properties in reinforced concrete." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22520.

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Mestrado em Engenharia Química<br>Este trabalho tem como objetivo aplicar hidróxidos duplos lamelares (LDHs) intercalados com inibidores de corrosão em betão armado por forma a proteger as estruturas de aço da corrosão e aumentar a longevidade do mesmo. Para tal, foram sintetizados LDH-NO3 e LDH-NO2. A partir da suspensão de LDH-NO3, procedeu-se à intercalação com iões citrato e tartarato. Todas as amostras foram caracterizadas utilizando técnicas como espetroscopia de FT-IR, X-RD, potencial zeta, DLS, SEM/TEM e ICP. Realizaram-se estudos de libertação, colocando, em agitação, alíquotas de sol

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