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Dissertations / Theses on the topic 'Hydrothermal and precipitation synthesis'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Ghanizadeh, Shaghayegh. "Synthesis and processing of nanostructured alumina ceramics." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13504.

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The term Nanoceramics is well known in the ceramic field for at least two decades. In this project a detailed study was performed on the synthesis of α-alumina nanopowders. High solids content nanoalumina suspensions were prepared and used to form green bodies using both wet and dry forming routes. The green bodies were then sintered using both conventional single and two-step sintering approaches. Synthesis: Two different synthesis methods, viz. precipitation and hydrothermal treatment, were used to synthesize fine α-alumina powders from aluminium chloride, ammonia solution and TEAH (Tetraeth
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2

Wang, Jianfeng. "A study of rare earth element substituted strontium hexaferrite produced by chemical co-precipitation and hydrothermal synthesis." Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288888.

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Hexaferrites are still a very important component of the permanent magnets market because of their low price combined with reasonably attractive magnetic properties. In such a context, any improvement of the magnet data would be of great importance. In recent years, work has been carried out on improving the magnetic properties by a combined substitution of La and Co into the Sr-ferrite composition. This improvement was largely associated with an increase of coercivity and the underlying magneto-crystalline anisotropy. The possibility of replacing Sr by La and the subsequent improvement of the
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3

Ameh, Emmanuel Alechine. "Sustainable synthesis of BEA zeolite from fly ash-based amorphous silica." University of Western Cape, 2019. http://hdl.handle.net/11394/7522.

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Philosophiae Doctor - PhD<br>Power generation in South Africa depends majorly on the combustion of coal and the increasing demand for energy due to industrialisation and population growth signifies the continuous consumption of coal. During this process, a by-product known as coal fly ash (CFA) is generated which poses several environmental issues. The common management of the waste involves the disposal of CFA in landfills or the direct disposal to open uncultured lands, thus contaminating water bodies by the leaching of constituent CFA metals and salts that render arable land uncultiva
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4

Young, Michael I. "Synthesis of zinc oxide nanoparticles with different morphologies by wet chemistry routes." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/25368.

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The objectives of this project were to synthesise semi-conducting ceramic nanoparticles including zinc oxide (ZnO) and aluminium doped zinc oxide (AZO) through a wet chemistry route to obtain nanoparticles with a controlled size and morphology. Wet chemistry methods (co-precipitation method and hydrothermal method) were used to synthesise ZnO and AZO particles. In the synthesis, various compounds and morphologies were synthesised. ZnO, Zn(OH)2 and unknown phases were co-precipitated, with only ZnO obtained following hydrothermal treatment. Morphologies ranging from platelets, flower-like, nano
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5

Lachal, Marie. "Etude des mécanismes d'insertion/désinsertion des cations alcalins (Li+/Na+) au sein de la structure olivine FePO4 pour accumulateurs Li-ion et Na-ion." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI035/document.

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Dans le cadre du développement des technologies Na-ion, le composé NaFePO4, équivalent chimiquedu matériau très attractif LiFePO4, représente une alternative intéressante aux problèmes deressourcement du lithium. Toutefois, les composés LiFePO4 et NaFePO4 de structure olivineprésentent des divergences de comportement structural et électrochimique lors de l'insertioncationique. Ce travail présente une analyse des mécanismes de (dés)insertion des ions Li+ et Na+ ausein de la phase FePO4 par voie chimique et électrochimique. Les échantillons de LiFePO4 ont étésynthétisés par deux méthodes différe
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6

Ejaz, Tabassum. "Hydrothermal precipitation of zeolite-A crystals." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267693.

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7

Yao, Yufeng. "Anhydrite precipitation and evolution of permeability in ocean ridge crest hydrothemal systems." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/25793.

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8

Pepple, Chris C. "Factors Affecting the Precipitation of Quartz Under Hydrothermal Conditions." Bowling Green State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1197992542.

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9

Reksten, Anita. "Hydrothermal Synthesis of LaFeO3." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16321.

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This work explores the hydrothermal synthesis of LaFeO3 (LFO) nanorods with a high aspect ratio. Synthesis of rod shaped LFO is a stepping stone to the synthesis of strontium doped LFO (LSF) nanorods with high aspect ratio. These LSF rods can be used to structure and increase the area of dense LSF oxygen permeable membranes, which can be applied in the partial oxidation of methane for the production of synthesis gas. Obtaining a larger surface area can increase the oxygen transport through the membrane when the transport is limited by surface exchange reactions. Increasing the oxygen transport
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10

Spooren, Jeroen. "Hydrothermal synthesis of manganites." Thesis, University of Exeter, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408744.

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11

Evans, Edward. "Continuous hydrothermal synthesis of inorganic nanoparticles." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/13255/.

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In Chapter 1, the special properties of nanoparticles are discussed, followed by different methods of nanoparticle synthesis, particularly the hydrothermal flow synthesis. Finally, factors thought to affect particle size are identified, and the aims of the Thesis are stated. In Chapter 2, hydrothermal flow reactors used by different research groups are discussed. Modelling of the reactor mixing point leads to a new nozzle design, to improve mixing and avoid blockages, which is incorporated into the Nottingham reactor. In Chapter 3, it is explained how initial problems of reactor blocking are s
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12

Martin, Jeffrey T. "The influence of silica precipitation and thermoelastic stresses on the evolution of a ridge crest seafloor hydrothermal system." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/28026.

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13

Caramazana, Gonzalez Pablo. "The sustainable engineering of continuous hydrothermal synthesis." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/46980/.

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Nanomaterials are increasingly used in novel applications, devices and processes. As a result industrial scale production it is a growing area. Continuous-flow hydrothermal synthesis (CFHS) offers substantial advantages over conventional techniques that can manufacture nanomaterials, due to its potential scalability from laboratory to industrial plant, versatility to synthesize a large variety of nanomaterials and its simplicity. Also, increasing concern around the environmental impact of manufacturing processes has led to the development of more careful and sustainable strategies from industr
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14

Gimeno-Fabra, Miquel. "Tailored continuous hydrothermal synthesis of targeted products." Thesis, University of Nottingham, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716843.

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Continuous flow hydrothermal synthesis offers a cost-efficient, environmentally friendly and highly scalable route to produce a wide range of materials. Recent advances in reactor design at Nottingham have led to the development of a high-throughput, continuous flow synthesis (CFS) method that has already proven suitable for the controlled production of various inorganic micro- and nanomaterials, mainly metal oxide based particles. In this thesis, the scope of this technology has been widened to include materials never before produced using flow systems.
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15

Hiley, Craig I. "New oxides for catalysis from hydrothermal synthesis." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/67159/.

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In this thesis the one-pot subcritical hydrothermal synthesis of several novel complex oxides with potential applications in catalysis is reported. The hydrothermal synthesis of nanocrystalline pentavalent ion-substituted cerium dioxide is reported. The materials were all characterised by powder diffraction and a range of spectroscopic techniques in order to elucidate their structures. Up to approximately 30% pentavalent ion-substitution the mixed metal oxides continue to adopt the fluorite unit cell, and the lattice parameter decreases as substitution increases. The choice of mineraliser in t
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16

Ulijn, R. V. "Precipitation driven biocatalysis." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366835.

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17

Bingol, Onur Rauf. "Hydrothermal-like Synthesis Of Hydroxyapatite From Calcium Sulfates." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612425/index.pdf.

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Synthesis of hydroxyapatite (Ca10(PO4)6(OH)2, HAp) from commercial grade plaster of paris (CaSO4&bull<br>0.5H2O, PoP) and gypsum (CaSO4&bull<br>2H2O) has been performed. HAp synthesis was achieved by reacting 1 M of (NH4)2HPO4 (or 0.5 M of (NH4)2HPO4) solutions with solid calcium sulfate precursors under ambient pressure (1 atm) and hydrothermal-like (2 &plusmn<br>0.2 atm, 120 &deg<br>C) conditions. Under ambient conditions, HAp formation kinetics was investigated at 25 &deg<br>C, 50 &deg<br>C and 90 &deg<br>C using 1 M of (NH4)2HPO4 solution. Conversion to HAp at such low temperature takes mo
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18

Almeida, Trevor P. "Hydrothermal synthesis and characterisation of α-Fe2O3 nanorods". Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11685/.

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The hydrothermal synthesis (HS) of α-Fe2O3 nanorods (NRs) is investigated using a combination of complementary analytical techniques. The construction of an HS ‘process map’ as a function of temperature, time and phosphate (PO43-) concentration provides insight into the nature of intermediate β-FeOOH NR precipitation, dissolution and subsequent α-Fe2O3 growth, along with the effect of PO43- anion concentration on the development of α-Fe2O3 particle shape. An HS processing temperature of 200˚C and an Fe3+ : PO43- molar ratio of 31.5 yielded crystalline acicular α-Fe2O3 NRs with an aspect ratio
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19

Şahin, Aytaç Eanes Mehtap. "Hydrothermal Synthesis and Characterization of Transition Metal Oxides/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/malzemebilimivemuh/T000435.doc.

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20

Özmen, Bahar Eanes Mehtap Thesis advisor. "Hydrothermal synthesis of solid state materials and crystallography/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimya/T000479.pdf.

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21

Gerrard, Lee A. "Solvothermal synthesis of mono and heterobimetallic materials." Thesis, University of East Anglia, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365020.

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22

Boldrin, Paul. "Synthesis and characterisation of nanomaterial catalysts made using continuous hydrothermal flow synthesis." Thesis, Queen Mary, University of London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497781.

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23

Holm, Linda Josefine. "Continuous hydrothermal synthesis and crystallization of magnetic oxide nanoparticles." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/10971.

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24

Kopetzki, Daniel. "Exploring hydrothermal reactions : from prebiotic synthesis to green chemistry." Phd thesis, Universität Potsdam, 2011. http://opus.kobv.de/ubp/volltexte/2011/5258/.

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In this thesis chemical reactions under hydrothermal conditions were explored, whereby emphasis was put on green chemistry. Water at high temperature and pressure acts as a benign solvent. Motivation to work under hydrothermal conditions was well-founded in the tunability of physicochemical properties with temperature, e.g. of dielectric constant, density or ion product, which often resulted in surprising reactivity. Another cornerstone was the implementation of the principles of green chemistry. Besides the use of water as solvent, this included the employment of a sustainable feedstock and t
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25

Harunsani, Mohammad H. "Characterisation of mixed-metal oxides prepared by hydrothermal synthesis." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/59471/.

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Mixed-metal oxides were prepared via hydrothermal synthesis and characterised using various analytical techniques. Three different class of materials were studied, namely perovskites, hexagonal perovskites and doped TiO2. By using hydrothermal synthesis, control on the crystal size, morphology and phase purity was achieved, which are difficult by conventional methods. A new titanate perovskite solid solution with nominal composition, NaCe1-xLaxTi2O6, containing three different metals on the A-site was produced by a single step hydrothermal synthesis. Rietveld analysis of powder X-ray and neutr
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26

Booth, Mark William. "The characterisation of mullite-related phases by hydrothermal synthesis." Thesis, Open University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307786.

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27

Gün, Özgül Eanes Mehtap. "Hydrothermal synthesis and characterization of ethylenediamine-containing molybdenum oxides/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/kimya/T000531.pdf.

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Thesis (Master)--İzmir Institute of Technology,İzmir, 2006<br>Keywords: Hydrothermal synthesis, crystal structure, organic-inorganic hybrid materials, copper molybdate, ethylenediamine. Includes bibliographical references (leaves. 86-92).
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28

Johnson, Ian David. "Continuous hydrothermal synthesis of nanomaterials for rechargeable battery applications." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/10040432/.

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This thesis investigates Continuous Hydrothermal Flow Synthesis (CHFS) as a method to produce materials for rechargeable batteries. The key advantages of this technology are the scalability (up to 2 kg h−1 production rate), rapidity (synthesis time on order of seconds) and low reaction temperature (≤ 400 °C) of this method, which is capable of producing materials in the nanoscale. Nanoparticles (< 100 nm diameter) are of high interest for rechargeable battery applications, due to their high surface area and enhanced charge/discharge kinetics. Various materials (and their doped analogues) for L
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29

Burnett, David L. "New oxides for oxygen evolution catalysis from hydrothermal synthesis." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/88590/.

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The hydrothermal synthesis of complex oxides of ruthenium and iridium with potential application as oxygen evolution reaction catalysts in polymer electrolyte membrane fuel cells is reported. The materials M0.15Ru0.85O2, where M = Zn, Mg, Ni, Co or Cu, have been synthesised from peroxide reagents and potassium perruthenate. Structural refinement against powder neutron diffraction data shows these materials adopt the rutile structure with space group P42/mnm with the metals substituting ruthenium and no evidence of oxide vacancies. X-ray absorption near-edge structure spectra recorded at the Ru
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30

Joo, Jaebum. "Rational control of hydrothermal nanowire synthesis and its applications." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59220.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.<br>Includes bibliographical references (p. 172-182).<br>Hydrothermal nanowire synthesis is a rapidly emerging nanowire discipline that enables low temperature growth and batch process. It has a major impact on the development of novel energy conversion devices, high density electronics, and optical devices. However, detailed growth mechanism is still in early stage of its development. This thesis presents the fundamental understanding of controlled zinc oxide nanowire synthesis in a hydrot
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31

Starkey, Christopher L. "Continuous-flow hydrothermal and solvothermal synthesis of inorganic nanomaterials." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/37016/.

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Nanomaterials and nanotechnology are presently receiving high levels of interest which is aiding significant advancements to industrial and technological applications. New strategies towards nanoparticle synthesis are needed to produce high quality nanomaterials at industrially viable levels. This thesis presents the continuous flow hydrothermal and solvothermal synthesis (CFHSS) of a range of inorganic nanomaterials produced using a continuous-flow reactor designed at the University of Nottingham. The materials presented herein are currently industrially applicable or projected future trend m
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32

Mutinda, Samuel I. "Hydrothermal Synthesis of Shape/Size-Controlled Cerium-Based Oxides." Youngstown State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1378917332.

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33

French, Matthew William. "Hydrothermal synthesis and characterisation of nuclear waste storage materials." Thesis, Keele University, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.699682.

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The production of nuclear waste is undoubtedly a major downside to nuclear energy. In the UK, much of our intermediate and high level waste is currently stored in temporary facilities with the aim of burying it in deep underground facilities by 2040. In order to achieve this, the radionuclides require immobilising to prevent them from leaching into the environment. This can be achieved by incorporating the radionuclides into minerals, ceramics or glasses before encapsulation in disposal containers. In order for a material to be successful in this role it must be chemically durable, thermally s
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34

Wu, O. Y. "Continuous hydrothermal flow synthesis of lithium ion battery materials." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1455944/.

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There are a number of ways to improve the capacity of rechargeable batteries as suggested in the literature; carbon coating and reducing the particle size of the active material appear to be the most effective. In this work, the synthesis of pure phase LiFePO₄ nanoparticles was carried out directly in one step using the continuous hydrothermal flow synthesis (CHFS) system. Conventional synthesis methods require many steps and longer duration to obtain this cathode material. Microscopic data confirmed that the particles were successfully covered with an even carbon coating in situ where fructos
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35

Gutschke, Siegfried O. H. "Solvothermal synthesis of coordination solids." Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327491.

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36

Swash, Peter Michael. "The hydrothermal precipitation of arsenical solids in the Ca-Fe-AsO4-SO4 system at elevated temperatures." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244068.

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37

Karabicak, Seher. "Synthesis And Characterization Of Aluminoborophosphate Compounds By Hydrothermal And Solid." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/1219757/index.pdf.

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The hydrothermal and solid state methods were used in the synthesis of some aluminoborophosphate compounds. The products were investigated by using XRD, IR, DTA, DSC, ICP and SEM methods. The solid state reactions have been studied in the range 700 &ndash<br>1200&amp<br>#61616<br>C. Using several hydrothermal methods a novel aluminum phosphate compound Al3-xBxP3O12 was synthesized. The crystal system was found to be tetragonal with a=17.1629 and c = 12.6084A&deg<br>unit cell parameters and space group is P4212 (No:90). In anorthite mineral (CaAl2Si2O8) by replacing two silicon with bo
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38

Avola, Sabine [Verfasser], and Werner [Akademischer Betreuer] Kunz. "Salt effects in hydrothermal synthesis / Sabine Avola. Betreuer: Werner Kunz." Regensburg : Universitätsbibliothek Regensburg, 2012. http://d-nb.info/1029602352/34.

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39

Wright, Christopher Stuart. "Hydrothermal synthesis of cerium-containing oxides for use in catalysis." Thesis, University of Exeter, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436312.

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40

Cheng, Jian Wei Jayce. "Hydrothermal synthesis of zinc oxide nanowire arrays for photovoltaic applications." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/108216.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Zinc oxide (ZnO) nanowires with excellent crystal quality can be grown vertically aligned from a substrate using hydrothermal synthesis, a low-cost, scalable process that is compatible with many semiconductor processing techniques. However, precise control over nanowire array dimensions such as nanowire spacing, diameter, length, and alignment, which is important for optoelectronic device applications,
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41

GalvÃo, Wesley dos Santos. "Obtaining NiFe2O4 superparamagnetic nanoparticles by hydrothermal synthesis assisted by microwave." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=16458.

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Universidade Federal do CearÃ<br>NanopartÃculas de NiFe2O4, foram sintetizadas pelo mÃtodo da co-precipitaÃÃo, assistida por aquecimento de micro-ondas. Em seguida, estudou-se o efeito do tempo de aquecimento sobre as propriedades estruturais e magnÃticas da ferrita de NÃquel. O precipitado coloidal foi submetido ao aquecimento, mantida a temperatura constante em 160 ÂC, em trÃs tempos diferentes 7, 12 e 17 minutos, a fim de se determinar a melhor temperatura para sÃntese e que resultasse em materiais com boa morfologia e pequeno tamanho de cristalito. Os difratogramas das amostras confirmaram
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42

Provenzano, Justin. "A Study on the Hydrothermal Synthesis of the Zeolite DDR." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1321368016.

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43

Garrido-Hernandez, Aristeo. "Synthesis by hydrothermal process of lanthanide orthophosphates for optical applications." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22564/document.

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Les orthophosphates de lanthanides dopés avec des Terres Rares (TR) (LnPO4) sont considérés comme des luminophores intéressants pour des applications optiques. Les luminophores sont des matériaux luminescents qui transforment certains types d'énergie (rayons X, ultraviolet, visible, infrarouge) principalement en lumière visible. Dans le cadre de cette thèse, les matrices YPO4 (orthophosphate d'yttrium), LuPO4 (orthophosphate de lutétium), GdPO4 (orthophosphate de gadolinium) et GdxY1-xPO4 (orthophosphate d'yttrium et gadolinium), dopées avec les ions Eu3+ (europium), Ce3+, Tb3+ (terbium), Er3+
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44

Daniels, Luke M. "Structures and properties of perovskites and pyrochlores from hydrothermal synthesis." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/77054/.

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The hydrothermal syntheses of new complex pyrochlore and perovskite oxide materials have been explored. Disorder is prevalent in these materials, so their structures and properties were investigated using a wide range of techniques. New pyrochlore oxides with compositions (Na0:60Bi1:40)(Fe1:06Mn0:17Bi0:77)O6:87 and (K0:24Bi1:51)(Fe1:07Mn0:15Bi0:78)O6:86 were hydrothermally produced in solutions of NaOH or KOH, respectively, at 200oC for 6 hours. These pyrochlores are metastable, decomposing at ca 400oC, suggesting their formation would be impossible through conventional solid state synthesis.
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45

Lu, Chia-Chun, and 呂嘉峻. "Hydrothermal synthesis of TiO2 nanowires." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/20786053139696577282.

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碩士<br>國立成功大學<br>化學工程學系碩博士班<br>94<br>Sodium titanate nanowires were synthesized by hydrothermal process using Ti foil or P25 in NaOH solution. Sodium titanate nanowires were immersed in HCl for ion exchange to hydrogen titanate nanowires. Hydrogen titanate nanowires were further thermal converted to TiO2 nanowires. Formation parameters, such as NaOH concentrations, reaction temperatures and reaction times during hydrothermal process, are varied to search for suitable reactions for the formation of uniform nanowires. The diameter of the sodium titanate nanowires were in the range of 20 to 30 nm.
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46

Liu, Cheng-he, and 劉政和. "Hydrothermal synthesis of aluminum oxide." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/09979425292670906801.

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碩士<br>義守大學<br>生物技術與化學工程研究所碩士班<br>97<br>This study utilized continuous hydrothermal synthesis to produce flake boehmite with various morphology and size and spherical aluminum oxide.Based on the difference of heating,this study concluded that: (1) Produced by direct heating: 1.By up-flowing reactor,hexagonal flake of boehmite was obtained,and its mean size was 0.7 ~1.0 um.; 2.By down-flowing reactor,long hexagonal flake of boehmite was obtained, and its mean size was 1.43~2.69 um; 3.Morphology and size of the boehmite was mainly affected by the residence time in hydrothermal condition; 4.Flake
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47

Huang, Wen-chiao, and 黃雯巧. "Hydrothermal Synthesis of Monodispersed Boehmite Powders." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/63325307879678027843.

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碩士<br>國立成功大學<br>資源工程學系碩博士班<br>97<br>In this study, monodispersed boehmite (AlOOH) powders which were looking forward to be the precursors for the production of monodispersed α-Al2O3 powders were prepared hydrothermally using gibbsite (Al(OH)3) as raw materials. Boehmite is one of the most used precursors for producing α-Al2O3 powders in industry. However, α-Al2O3 powders obtained through the calcination of boehmite are usually characterized by vermicular outward and broad particle size distribution. One of the major reasons for this phenomenon may be due to the broad particle size distribution
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48

Fu-Chuan, Wang, та 王福傳. "Hydrothermal synthesis of α- Al2O3 powder". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/25713875186871581281.

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碩士<br>中華技術學院<br>機電光工程研究所碩士班<br>97<br>This study mainly develops the synthesizing process of α-alumina oxide (α-Al2O3) powder by hydrothermal method. The aluminum hydrate (Al(OH)3)) powders and ammonium hydrogen-carbonate (NH4HCO3) solution were charged into the vessel simultaneously. Then, the aluminum hydrate was transformed into α-alumina oxide in high-pressure as well as high-temperature state. X-ray diffraction was employed to analyze the constituting phases of the finished α-alumina oxide powders. The profile, surface, size, and lattice morphology of the powders were observed by scanning
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49

Lin, Yan-Chong, and 林彥充. "Synthesis ZnSe fluorescent nanoparticles by hydrothermal process." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/25935772184200150216.

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碩士<br>義守大學<br>材料科學與工程學系碩士班<br>99<br>ZnSe is a wide band II - VI semiconductor with direct band gap 2.67eV emission wavelength 463nm, the blue light range, has excellent optical properties. It is widely used in various applications such as light emitting diodes (LED), biomedical sensors, photovoltaic solar cells and photocatalytic materials and other applications. In this study, using the hydrothermal process and the reducing agent NaBH4 、 Na2SeO3 and Zn (CH3COO) 2 ‧ 2H2O mixed aqueous in the hydrothermal synthesis of zinc selenide (ZnSe) powder, changing the reaction temperature, time, concent
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50

Hui-Tzu, Chen, and 陳惠姿. "Hydrothermal Synthesis of Barium Titanate Fine Particles." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/41015594112090981937.

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碩士<br>國立中央大學<br>化學工程研究所<br>89<br>Barium titanate fine particles were prepared by hydrothermal synthesis. The synthesis was preformed at temperature between 75 ℃ and 180 ℃ and for 10 min-96 h. The reactions were carried out in a strong alkaline solution. Ba(OH)2‧8H2O was used as the Ba-precursor material. The various Ti-precursors were used to investigate their effects on the properties of BaTiO3. The as-synthesized of BaTiO3 powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen sorption measurement, and diff
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