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Dissertations / Theses on the topic 'Oxalic acid. Crystal growth'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Elliott, Mary Alice. "Crystal aging of terephthalic acid." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/10935.

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2

Dutt, Yougesh Chander. "Crystal growth of monosodium urate monohydrate." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24633.

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Hyperuricemia and local temperature changes in the joints of the extremities are known to be responsible, in part, for the development of gouty arthritis. No satisfactory explanation is yet available for (1) the selective deposition of monosodium urate monohydrate (MSUM) crystals in connective tissues (2) the increased incidence of gout in the later years of life and (3) the increased incidence of MSUM crystal deposition in connective tissues after trauma and in joints with preexisting disease. It is possible that the alterations in composition of the non-fibrillar matrix of cartilage and syno

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3

Eaton, Gregory K. "Oxalic acid production by the ectomycorrhizal fungus Hebeloma westraliensis and its role in the nutrient acquisition and growth of Eucalyptus diversicolor in calcareous soil." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/41292.

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This work includes an introduction and literature review of mycorrhizal enhancement of the mineral nutrition of host plants. Particular attention was paid to the role of mycorrhizae in acquiring P from inorganic phosphates. Two experiments were designed to study a mechanism by which the ectomycorrhizal fungus Hebeloma westraliensis can enhance the availability and absorption of P from Ca phosphate by <u>Eucalyptus diversicolor</u> in calcareous soil. Chapter 2 reports on a study on the growth and oxalic acid production of <u>H. westraliensis</u> in calcareous and noncalcareous liquid media. Ox

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4

Walker, Elaine M. "Modelling the effect of growth envirnoment on the crystallisation of molecular organic compounds." Thesis, University of Strathclyde, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360150.

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5

Sullivan, Rachel. "Molecules, clusters and crystals : the crystallisation of p-aminobenzoic acid from solution." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/molecules-clusters-and-crystals-the-crystallisation-of-paminobenzoic-acid-from-solution(ec826e71-782f-4bb0-9dc2-48cf94a7c941).html.

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Nucleation is a key step in the crystallisation process, where a new crystalline solid phase is created from a supersaturated solution. The applications of crystallisation as a purification and separation technique span many industries, yet still no definitive molecular mechanism for nucleation exists. This PhD is part of a critical mass research project involving researchers from both the Universities of Manchester and Leeds. The aim is to reveal the relationship between structural components of the nucleation transition state, solution phase molecular self-assembly and nano cluster formation

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6

Holmbäck, Xiomara. "Drowning-out crystallisation of benzoic acid : Influence of processing conditions and solvent composition on crystal size and shape." Doctoral thesis, KTH, Chemical Engineering and Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3448.

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<p>The aim of the present investigation is to increase theunderstanding of the role played by the solvent in inhibitingor enhancing crystal growth. Drowning-out crystallizationexperiments has been performed by the controlled addition ofwater or ethanol water mixtures to a saturated solution ofbenzoic acid in ethanol-water mixtures. Crystal habitcontrolling factors have been identified.Seededcrystallization experiments have been carried out to evaluatethe effect of solvent composition on crystal habit at constantsupersaturation. The solubility of benzoic acid inethanol-water mixtures at the wor

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7

Gaines, Etienne. "The nucleation and growth of meta-aminobenzoic acid : a density functional theory and molecular dynamics study." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/54056.

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Controlling crystal polymorphism, the ability of a molecule to crystallise in different solid forms, is one of the grand, ongoing challenges in materials science. In the pharmaceutical industry particularly, where up to half of the active pharmaceutical active ingredients exhibit polymorphic behaviour, it is of paramount importance to rationalise the impact of experimental conditions, such as the nature of the solvent, on the obtainment of a specific c crystal form. As strategies for the selection of polymorphs is still, by and large, based on a trial-and-error approach, it is necessary to acq

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8

Ibrahim, Mohamed Asim Y. "Co-processing of drugs and co-crystal formers and its effect on pharmaceutical dosage-form performance. Co-crystallization of urea/ 2-methoxybenzamide, caffeine/ malonic acid, caffeine/ oxalic acid and theophylline/ malonic acid systems: Solid-state characterization including imaging, thermal, X-ray and Raman spectroscopic techniques with subsequent evaluation of tableting behaviour." Thesis, University of Bradford, 2008. http://hdl.handle.net/10454/12760.

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This dissertation has focused on the solid-state characterization of different co-crystal system as well as the effect of co-crystallization of these systems on pharmaceutical dosage form performance. Urea/ 2-MB, caffeine/ malonic acid, caffeine/ oxalic acid and theophylline/ malonic acid co-crystals were prepared using co-grinding- and co-precipitation techniques. In addition, the synthesis of co-crystals through two novel methods has been demonstrated. This includes compaction and convection mixing. The solid-state characterization of the co-crystals has been carried out using XRPD, Raman sp

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9

Ibrahim, Mohamed Asim Yousif. "Co-processing of drugs and co-crystal formers and its effect on pharmaceutical dosage-form performance : co-crystallization of urea/2-methoxybenzamide, caffeine/malonic acid, caffeine/oxalic acid and theophylline/malonic acid systems : solid-state characterization including imaging, thermal, X-ray and Raman spectroscopic techniques with subsequent evaluation of tableting behaviour." Thesis, University of Bradford, 2008. http://hdl.handle.net/10454/12760.

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This dissertation has focused on the solid-state characterization of different co-crystal system as well as the effect of co-crystallization of these systems on pharmaceutical dosage form performance. Urea/ 2-MB, caffeine/ malonic acid, caffeine/ oxalic acid and theophylline/ malonic acid co-crystals were prepared using co-grinding- and co-precipitation techniques. In addition, the synthesis of co-crystals through two novel methods has been demonstrated. This includes compaction and convection mixing. The solid-state characterization of the co-crystals has been carried out using XRPD, Raman sp

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10

Zhang, Shuo. "Physical properties and crystallization of theophylline co-crystals." Licentiate thesis, KTH, Transport Phenomena, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13255.

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<p>This work focuses on the physical properties and crystallization of theophyline co-crystals. Co-crystals of theophylline with oxalic acid, glutaric acid and maleic acid have been investigated.</p><p>The DSC curves of these co-crystals show that their first endothermic peaks are all lower than the melting temperature of theophylline. The decomposition temperature of theophylline – oxalic acid co-crystal is at about 230 °C, determined by DSC together with TGA. After decomposition, the remaining theophylline melts at about 279 °C, which is higher than the known melting temperature of theophyll

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11

Javed, Hafsa Shamim. "Investigating co-crystallisation of primary amides and carboxylic acids : comparative analysis of Benzamide, Isonicotinamide and Nicotinamide co-crystal growth with carboxylic acid." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/5436.

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Crystal Engineering is the design of crystalline material using non-covalent synthesis. Co-crystals are multi-component crystals which are constructed from complementary intermolecular interactions, they are also known as supramolecular complexes. Design of such materials utilises the synthon approach, this involves the understanding of common intermolecular interactions which occur in the crystal packing and is used to design new solids with desired physical properties and chemical properties. Primary amides form supramolecular heterosynthons, these synthons represent an opportunity for a des

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12

Javed, Hafsa S. "Investigating co-crystallisation of primary amides and carboxylic acids. Comparative analysis of Benzamide, Isonicotinamide and Nicotinamide co-crystal growth with carboxylic acid." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/5436.

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Crystal Engineering is the design of crystalline material using non-covalent synthesis. Co-crystals are multi-component crystals which are constructed from complementary intermolecular interactions, they are also known as supramolecular complexes. Design of such materials utilises the synthon approach, this involves the understanding of common intermolecular interactions which occur in the crystal packing and is used to design new solids with desired physical properties and chemical properties. Primary amides form supramolecular heterosynthons, these synthons represent an opportunity for a des

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13

Rosbottom, Ian. "The influence of the intermolecular synthons on the molecular aggregation, polymorphism, crystal growth and morphology of p-aminobenzoic acid crystals from solution." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/12103/.

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Intermolecular pairwise interactions (synthons) have previously been used to predict physical properties of molecular crystals, such as polymorphism, morphology and mechanical properties. The overall goal of this research was to correlate the synthon strength and nature found in the crystal structures of the α- and β-forms of 4-aminobenzoic acid to experimentally observed data, assessing their applicability for predicting crystallisation conditions that would produce crystals of desirable physical properties. The strength and nature of the synthons found in the α-structure were found to signif

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14

Vedantham, Kumar. "Effect of operating parameters on the growth rate of solution grown crystals." Master's thesis, Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-07122004-101317.

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15

Berná, Galiano Antonio. "Estudio espectroelectroquímico de los equilibrios ácido-base de especies adsorbidas sobre electrodos metálicos con superficies monocristalinas bien definidas." Doctoral thesis, Universidad de Alicante, 2014. http://hdl.handle.net/10045/45809.

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16

Vilela, Rivelino Cunha. "Estudo de transições de fase em cristais de l-alanina + ácido oxálico." reponame:Repositório Institucional da UFC, 2013. http://www.repositorio.ufc.br/handle/riufc/13883.

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VILELA, Rivelino Cunha. Estudo de transições de fase em cristais de l-alanina + ácido oxálico. 2013. 113 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2013.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-10-29T21:51:24Z No. of bitstreams: 1 2013_tese_rcvilela.pdf: 12577577 bytes, checksum: 4dc32419c1bbdde79375612c04227181 (MD5)<br>Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2015-11-03T19:48:22Z (GMT) No. of bitstreams: 1 2013_tese_rcvi

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17

Junior, Jose Joatan Rodrigues. "Crescimento e caracterização óptica de cristais de L-treonina e L-lisina-HCL." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-12112007-160132/.

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Neste trabalho nós crescemos e caracterizamos oticamente cristais de L-treonina e L-lisina-HCl. Esses materiais pertencem a uma família de cristais orgânicos que tem demonstrado potencial para uso como dispositivos ópticos não lineares. Os cristais foram crescidos em solução aquosa pelos métodos de evaporação lenta do solvente e abaixamento controlado da temperatura. Realizamos medidas de óptica linear, índices de refração e a absorção óptica, e de óptica não linear, a geração de segundo harmônico (GSH). Essa nova classe de materiais não linear é de fácil crescimento e apresentam uma boa quali

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18

Junior, José Joatan Rodrigues. "Estudo de propriedades ópticas não lineares de aminoácidos." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-24012008-083441/.

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Neste trabalho estudamos as propriedades ópticas não lineares de aminoácidos utilizando pulsos de laser com duração de femtossegundos. O índice de refração não linear (n2) da L-alanina, L-prolina, L-serina, L-treonina e L-arginina em solução aquosa foram determinados. Foi também estudada a influência do pH na magnitude de n2 dos aminoácidos em solução. Paralelamente, determinamos a dispersão de n2 em cristais de L-treonina nos três eixos principais, x, y e z. Os aminoácidos têm despertado grande interesse devido as suas boas propriedades ópticas de segunda ordem. Todavia, suas propriedades ópt

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19

Vilela, Rivelino Cunha. "ESTUDO DE TRANSIÃÃES DE FASE EM CRISTAIS DE L-ALANINA + ÃCIDO OXÃLICO." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10397.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Neste trabalho, estudou-se o efeito da temperatura nos espectros Raman de cristais de L-alanina + Ãcido oxÃlico, C3H8NO2+.C2HO4-. Foram realizadas medidas de espectroscopia Raman em policristais a diferentes temperaturas no intervalo compreendido entre a temperatura ambiente e a temperatura de 20 K, sendo fornecida uma identificaÃÃo tentativa para todos os modos normais de vibraÃÃo observados. Para auxiliar o entendimento do comportamento do cristal tambÃm foram obtidos os difratogramas de raios-X bem como estudada a dependÃncia do

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20

Sanci, Rukiye. "Synthesis Of Colloidal Silver Particles With Different Sizes By Seeding Approach For Surface Enhanced Raman Scattering (sers) Studies." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611076/index.pdf.

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In this study, silver nanorods and nanospheroids were prepared both in aqueous solution and on the surface of glass slides through seed-mediated growth approach at room temperature and used as a surface enhanced Raman scattering (SERS) substrate. The synthesis of metallic nanorods was started with the production of silver nanospheres as seed utilizing sodium borohydride and trisodium citrate as reducing and capping agents, respectively. These seeds were then added to a growth solution containing additional silver salt, ascorbic acid and cetyltrimethylammonium bromide (CTAB.) Nanorod preparati

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21

NUNES, MAIRA G. "Desenvolvimento dos dosímetros termoluminescentes de CaSOsub(4):Ce, Eu para a monitoração individual externa e a dosimetria clínica de fótons e elétrons." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10566.

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Made available in DSpace on 2014-10-09T12:42:03Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:04:42Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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22

Seaton, Colin C., A. Parkin, C. C. Wilson, and Nicholas Blagden. "Growth of an organic co-crystal upon a component subphase." 2008. http://hdl.handle.net/10454/4845.

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no<br>We report on the templated growth of 2:1 benzoic acid/isonicotinamide co-crystal on a benzoic acid subphase. The molecular basis for the template, registry between the phases, is presented. The template growth of behavior of the title compound was contrasted with that from melt and solution. This approach may be applicable as a precursor for the synthesis of bulk composite crystals.

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23

Tai, Chia-Fu, and 戴嘉甫. "Study on Correlation between The Capacity of Oxalic Acid Degradation of Trichoderma spp. and Their Growth Inhibition of Sclerotium rolfsii." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/uqeqqv.

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碩士<br>國立虎尾科技大學<br>生物科技研究所<br>102<br>Southern blight caused by the soilborne fungus Sclerotium rolfsii Sacc. Was one of the most destructive diseases in the world. The host range of this pathogen was at least 500 species in 100 families. Oxalic acid secreted by S. rolfsii reduced the pH of infected plant’s surface, and finally infected plant became fester and die quickly. In this study, the correlation between antifungal capability of Trichoderma spp. and its degradation of oxalic acid from S. rolfsii was tested. Four strains S. rolfsii which were isolated from different hosts, Oncidium, peanut

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24

Raghavendra, Rao K. "Growth and Physical Properties of Biaxial Nonlinear Optical Crystals of Ascorbic Acid Family." Thesis, 2014. http://hdl.handle.net/2005/3180.

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Saccharides, a class of organic materials, are potential candidates for nonlinear optical applications. Ascorbic acid is a sugar acid and is classiﬁed as a monosaccharide. The molecule of ascorbic acid has two chiral centers and, therefore, four stereoisomers. Among them, two are naturally occurring compounds; L-ascorbic acid and D-isoascorbic acid. From these two acids various salts and other derivatives could be synthesized. In this thesis, four compounds of the ascorbic acid family were selected for detailed study based on their nonlinearity, chemical and physical stability and their crysta

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25

Vanishri, S. "Studies On Growth And Physical Properties Of Certain Nonlinear Optical And Ferroelectric Crystals." Thesis, 2006. http://hdl.handle.net/2005/320.

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Nonlinear optics and ferroelectrics have been recognized for several decades as promising fields with important applications in the area of opto-electronics, photonics, memory devices, etc. High performance electro-optical switching elements for telecommunications and optical information processing are based on the material properties. Hence, there is always a continuous search for new and better materials. In this thesis we have investigated the growth and physical properties of four crystals viz. two NLO and two ferroelectric crystals. This thesis consists of eight chapters. The first chapt

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26

Hong, Ming-Yang, and 洪明揚. "Effect of two pore size polyacrylamide/gelatin inverted colloidal crystal scaffolds combined with solid lipid nanoparticle encapsulated retinoic acid and grafted fibroblast growth factor 7 on differentiation of induced pluripotent stem cells into islet cells." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/j9a85p.

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碩士<br>國立中正大學<br>化學工程研究所<br>107<br>Induced pluripotent stem cells (iPSCs) differentiate into pancreas cell in invert colloidal crystals scaffold. In this research, we used polyacrylamide (PAAM) and gelatin to crosslink with genipin. Double layer regular pore scaffold were prepared by two different size polystyrene. Crosslinking activin A and Wnt3a with EDC and NHS on the surface of gelatin-PAAM double layer scaffolds made iPSCs differentiate into definitive endoderm. Analysing different composition gelatin-PAAM scaffolds were measured swelling ratio, porosity, cell adhesion and cell viability.

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