Relevant bibliographies by topics / Acidity constant / Dissertations / Theses
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Dissertations / Theses on the topic 'Acidity constant'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 May 2024

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1

Gali, Sai Manoj. "Modélisation des relations structure / propriétés de transport de charge dans les matériaux pour l'électronique organique." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0693/document.

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Les avancées technologiques et l'intégration massive de dispositifs électroniques nanométriques dans les objets de notre vie quotidienne ont généré une explosion des coûts de R&D, de conception et de production, ainsi que des inquiétudes sociétales quant à l'impact environnemental des déchets électroniques. En raison de procédés de production moins coûteux et à faible impact environnemental, de leur souplesse d’utilisation et de la possibilité de moduler leurs propriétés à l’infini, les molécules et polymères organiques constituent une classe de matériaux prometteuse pour la mise au point
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2

Andriamadio, Pascal. "Amino-2 thiophènes et dérivés : Constantes d'acidité et mesures de rotations empêchées en milieux non aqueux." Nancy 1, 1986. http://www.theses.fr/1986NAN10957.

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Les amino-2 thiophènes diversement substitués en position 5 sont insolubles dans l'eau et la première partie de ce travail a consisté à rechercher des solvants aprotiques suffisamment dissociants pour permettre la mesure du pH au moyen d'indicateurs colorés. Des relations de BRONSTED satisfaisantes ont été obtenues respectivement dans l'acétonitrile et dans le DMSO. Dans la deuxième partie, l'étude par RMN des autres dérivés R5 = H, CI, COCH3, CHO et NO2 a permis de montrer que le rapport de population entre les deux isomères X et Y s'inverse par passage de NO2 à H (PX/PY = 0. 074 et 9,65 dans
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3

Cunha, Antonio Rodrigues da. "Estudos teórico e experimental de propriedades estruturais e eletrônicas da molécula emodina em solvente e em bicamadas lipídicas." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02102014-142757/.

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A Emodina (EMH) é uma das antraquinonas mais abundantes na natureza. Essa molécula vem sendo largamente usada como material de estudo científico por apresentar diversas atividades farmacológicas, tais como antiviral, antitumoral, antifungal, digestiva e outras. É conhecido que a Emodina em solução aquosa alcalina pode sofrer mais de um processo de desprotonação, apresentando-se na forma desprotonada, EM-, após a primeira desprotonação. Nesta tese de doutorado estudamos as propriedades estruturais e eletrônicas da molécula Emodina em meio solvente e em bicamadas lipídicas a fim de caracterizar
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4

Kattirtzi, John Andrew. "A density functional theory study on a manganese dioxide-water interface : acidity constants and redox potentials." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648581.

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5

Benhlima, Nadia. "Echelles d'acidite et de potentiel redox dans le nitrate d'ethylammonium fondu et ses melanges avec l'eau a 298 k." Paris 6, 1988. http://www.theses.fr/1988PA066066.

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6

Gao, Pengyuan. "Theoretical Studies of the Interaction between U(VI) and Mineral Surfaces." Electronic Thesis or Diss., Orléans, 2023. http://www.theses.fr/2023ORLE1074.

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L'étude des processus d'adsorption des radionucléides sur les surfaces minérales est fondamentale pour la conception et l'évaluation de la sûreté des futurs systèmes de stockage des déchets radioactifs, ainsi que pour les diagnostics environnementaux des milieux pollués par des radionucléides. Parmi ces radionucléides, l'uranium a une abondance relativement élevée dans les systèmes naturels et a un rôle central dans le cycle du combustible nucléaire. L’uranium peut se trouver sous plusieurs états d’oxydation. L'U(VI) est l'état d'oxydation le plus pertinent dans la plupart des eaux de surface
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7

Cabot, Canyelles Joan Marc. "Determinació de constants d’acidesa de substàncies d’interès biològic per electroforesi capil·lar." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/288290.

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Aquesta Tesi es titula Determinació de constants d’acidesa de substàncies d’interès biològic per electroforesi capil·lar. La Dissertació es focalitza llavors en l’estudi de la determinació de la constant d’acidesa de fàrmacs utilitzant aquesta tècnica d’electroseparació, l’electroforesi capil·lar. La constant d’acidesa o pKa és una propietat fisicoquímica útil en el descobriment i desenvolupament de fàrmacs, on el coneixement de l’estat de ionització d’un grup funcional és sovint essencial per a comprendre les propietats farmacocinètiques i farmacodinàmiques de nous fàrmacs potencials. Gràcies
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8

Sandqvist, Wedin Emma. "Optimization of Acidic Degradation of Hyaluronic Acid using Design of Experiments." Thesis, Linköpings universitet, Teknisk biologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-156273.

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Hyaluronic acid (HA) is an unbranched polysaccharide consisting of the repeating disaccharide unit β(1→4)-GlcA-β(1→3)-GlcNAc and is a naturally occurring biopolymer in bacteria and vertebras. HA is predominantly found in the extracellular matrix (ECM) and the in vivo function of HA can vary depending on molecular weight (Mw) for instance high Mw HA is reported to be anti-angiogenic while low Mw HA induces angiogenesis. HA is a popular component for hydrogels such as dermal fillers. HA is commonly used in dermal fillers. However, other materials, such as other polymers, can be used as well. The
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9

Elbagerma, Mohamed A. "Analytical method development for structural studies of pharmaceutical and related materials in solution and solid state : an investigation of the solid forms and mechanisms of formation of cocrystal systems using vibrational spectroscopic and X-ray diffraction techniques." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4467.

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Analysis of the molecular speciation of organic compounds in solution is essential for the understanding of ionic complexation. The Raman spectroscopic technique was chosen for this purpose because it allows the identification of compounds in different states and it can give information about the molecular geometry from the analysis of the vibrational spectra. In this research the ionisation steps of relevant pharmaceutical material have been studied by means of potentiometry coupled with Raman spectroscopy; the protonation and deprotonation behaviour of the molecules were studied in different
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10

Robouch, Piotr. "Contribution a la prevision du comportement de l'americium, du plutonium et du neptunium dans la geosphere, donnees chimiques." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13230.

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Etude de l'hydrolyse de l'am. Solubilite de am::(2)(co::(3))::(3) en milieu naclo::(4) 3m ; seuls les complexes am (co::(3))::(i)**(3-i) ont ete trouves. Calcul des constantes de stabilite. Formation de complexes entre am et les matieres humiques. Mesure de la solubilite de puo::(2)co::(3) en milieu hco::(3)**(-)/naclo::(4). Diagrammes de pourbaix, utiles pour la speciation de np, pu et am dans differentes eaux naturelles souterraines
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11

Debleds, François. "Complexation d'électrophiles aromatiques par des bases hétérocycliques ambidentes : structure et réactivité d'adduits carbones et azotes pyrroliques indoliques et imidazoliques." Paris 6, 1987. http://www.theses.fr/1987PA066330.

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Structure et formation des complexes de Meisenheimer du trinitro-1,3,5 benzène avec divers indoles, pyrroles, imidazoles ; étude cinétique de la décomposition de ces complexes. Etude cinétique de la protonation du kryptopyrrole en solution aqueuse.
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12

Kupcová, Kristýna. "Studium acidobazických vlastností derivátů bilirubinu metodou kapilární zónové elektroforesy." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-304454.

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in English The concise summary of literary information about bilirubin and its structure derivative ranarubin is the topic of this thesis. The experimental part is dedicated to investigation of some properties of this substances and their comparison. The rate of degradation and acid- base behaviour was monitored under the laboratory conditions using capillary zone electrophoresis. The results point to differences in their behaviour.
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13

Gravador, Rufielyn Sungcaya. "Determination of temperature effecton the measurements of pKa of some weak acids and weak bases using capillary zone electrophoresis." Master's thesis, 2010. http://hdl.handle.net/10400.1/10748.

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This study was done to determine the pKa values of a number of weak acidic and basic compounds at different temperatures and to be able to identify the effects of temperature variations in the measured pKa using capillary zone electrophoresis. The method employed was adopted from Fuguet et al [12] in which internal standard is used. Running buffers of different pH were prepared. The maximum voltage was chosen based from Ohm’s law to reduce the Joule heating effects. Considering the linearity in the relationship between voltage and current to be with an r2≥0.999, the maximum voltage was found t
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14

Elbagerma, Mohamed A., Adel I. Alajtal, Howell G. M. Edwards, G. H. Azimi, K. D. Verma, and Ian J. Scowen. "Raman spectroscopic and potentiometric studies of acidity level and dissociation of citric acid in aqueous solution." 2015. http://hdl.handle.net/10454/9338.

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No<br>The dissociation constant is one of the most important characteristics of a pharmaceutical chemical moiety which has to be estimated with accuracy. The development of in-situ speciation methods in solutions with parallel measurements using Raman spectroscopy (molecular) and pH (macroscopic) for the identification, characterization, and quantitative determination of citric acid species in aqueous solution by numerical data treatment using a multiwavelength curve fitting program over a range of pH values is described. As a result, the first, second and third stepwise dissociation constants
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15

Munkerup, Kristin. "Reactivity and Properties of the PN 3P Pincer Platform Insights from Computations and Spectroscopy." Diss., 2019. http://hdl.handle.net/10754/656691.

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Abstract: Pincer compounds are organometallic complexes with intriguing tunable reactivities. In this work we explore their unique properties and reactivities through spectroscopic and computational investigations, with a focus on the PN3P pincer platform. First, we conducted a computational study on five pincer complexes with stereogenic phosphine arms that have multiple well-defined rotamers. Significant energy differences could be found between the lowest and highest energy rotamer in each set of pincer complexes. All rotamers for reactant, transition state, and product, were evaluated in
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16

Tsung-Hsing, Cheng, and 鄭重欣. "Changes of Glial Fibrillary Acidic Protein and Calbindin in the Rat Spinal Cord after Constant Compression Injury." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/10897767420601387477.

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碩士<br>國防醫學院<br>生物及解剖學研究所<br>89<br>In the past, many studies were attempted to set up an animal model to explore the possible events of the spinal cord injury. Many models were therefore established to deal with the cord injury of different conditions. The authors also tried to create a reasonable and well-matched model for the physical changes of the observed factors. The more compatible normal physical phenomenon showed, the better animal model was. In the present animal model, a steel ball fixed on Nylon suture with Durelon, then implanted epidurally on the dorsolateral side of T10 spinal c
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