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Dissertations / Theses on the topic 'Acidity investigation'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Mohd, Saupi Hanim Salami Binti. "Investigation of the acidity of Brønsted acids in ionic liquids." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/58941.

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The Hammett acidity functions (H0) of mixtures of Brønsted acids-ionic liquids were measured using a 13C NMR probe and several UV-Vis probes. Successful measurements for all of the systems were demonstrated using the UV-Vis probes. A suitable probe was chosen and used to measure each mixture with the estimation of H0 values from the 13C NMR probe. The 13C NMR probe can be used to calculate the acidity of the mixtures approximately while the UV-Vis probe gave more precise results. The H0 of Brønsted acids-ionic liquids systems with different acids were successfully measured using the 13C NMR pr

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2

Kitto, Abdul-Massih N. "Physico-chemical investigation of acidic and basic gaseous and particulate pollutants in the troposphere." Thesis, University of Essex, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292093.

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3

Dalton, Catherine Phillippa. "A palaeolimnological investigation of acidity in humic lake waters in Connemara, western Ireland." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393109.

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4

To, Trang Quynh. "Investigation of the acidity and nucleophilicity of ionic liquid mixtures and their effects on reaction rates." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11648.

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The Hammett acidity functions (H0) of mixtures of 1-butyl-3-methylimidazolium hydrogensulfate with sulfuric acid, and 1-butylimidazolium hydrogensulfate with sulfuric acid, were measured using UV dyes. A linear correlation between H0 value and the concentration of sulfuric acid was observed for both mixtures. H0 values of the mixtures were also measured using an NMR probe, mesityl oxide. The H0 values calculated from the mesityl oxide experiments agreed well with the H0 values calculated from the UV dye data. 1-Butyl-3-methylimidazolium hydrogensulfate, 1-butylimidazolium hydrogensulfate, 1-bu

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5

Hu, Bing. "³¹P MAS NMR investigation of surface acidity on silica-alumina catalysts using adsorbed phosphines as new probes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24315.pdf.

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6

Xie, Jingyi. "Hydrogen production on bimetallic catalysts and local acidity investigation of aluminosilicates and mesoporous silica via single molecule spectroscopy." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/34477.

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Doctor of Philosophy<br>Department of Chemical Engineering<br>Keith L. Hohn<br>The autothermal reforming and partial oxidation of hexadecane via Pt/Ni bimetallic nanoparticles on various ceria-based supports were investigated. Nanoparticles with Pt/Ni molar ratios ranging from 0/100 to 10/90 were loaded on ceria-based supports including cerium oxide, gadolinium-doped cerium oxide and cerium-doped zirconium oxide. The effect of the Pt/Ni molar ratio and the promotional effect of the support were studied by comparing the hydrogen yield. TPR and XPS analysis showed that there was a strong interac

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7

Lay-Fortenbery, Ashley. "INVESTIGATION OF FACTORS INFLUENCING PROTEIN STABILITY IN LYOPHILIZED FORMULATIONS USING SOLID-STATE NMR SPECTROSCOPY." UKnowledge, 2019. https://uknowledge.uky.edu/pharmacy_etds/105.

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Many proteins are unstable in solution and must be formulated in the solid state. This has led to an increase in the use of lyophilized dosage forms. Lyophilization is a complicated processing method consisting of three major steps: freezing, primary drying, and secondary drying. This can lead to several formulation stability challenges including changes in ionization within the matrix, phase separation of the protein drug from added stabilizers, sufficient mobility within the system for movement of reactive species and protein side chains, and crystallization of excipients upon storage. Solid

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8

Isikdemir, Ozlem. "Investigation Of 8-year-long Composition Record In The Eastern Mediterranean Precipitation." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607064/index.pdf.

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Measurement of chemical composition of precipitation is important both to understand acidification of terrestrial and aquatic ecosystems and neutralization process in the atmosphere. Such data are scarce in the Mediterranean region. In this study, chemical composition of daily, wet-only, 387 number of rain water samples collected between 1991 and 1999 were investigated to determine levels, temporal variation and long-term trends in concentrations of major ions and trace elements between 1991 and 1999. Samples had already been collected and some of the analysis had been completed. The anions

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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

Halvachizadeh, Jaleh. "The Investigation of Reactions of Atomic Metal Anions with Small Hydrocarbons and Alcohols in the Gas Phase." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30646.

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Hydrocarbons are an abundant resource of carbon and hydrogen. For example, fossil can be used to produce useful organic compounds. However hydrocarbons seem to be inert. Thus, the activation of the C-H bond is a popular research area. Metals play the main role in most catalysts that convert hydrocarbons to starting materials in industry. The study of metals is important because the properties of the metal core greatly influences the reactivity of a catalyst.1 The study of the chemistry of metals in the gas phase provides valuable information about the properties of metals. This information ca

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11

Fong, Tina Pui Wah. "Investigation of some acidic ruthenium dihydrogen and hydride complexes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0015/NQ41154.pdf.

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12

Rodriguez, Christian. "Investigating the Impact of College-Level General Chemistry Curricula on General Chemistry Students' Conceptions of Organic Acidity and Oxidation-Reduction." Thesis, State University of New York at Stony Brook, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10932210.

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<p>Chemistry students have historically struggled with conceptually understanding organic acidity and oxidation-reduction. Previously dominant approaches towards remediating students? misconceptions has been challenged by Explanatory Coexistence, which eludes to a competition between conceptions held within individuals. Conceptual reprioritization may be associated with the restructuring of conceptual dominance hierarchies, which may occur once a conceptual competition concludes. Investigation of conceptual reprioritizations of general chemistry students? conceptions of organic acidity and oxi

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13

Van, Dyk Jacobus Barend. "A detailed kinetic and mechanistic investigation of the multi-step oxidation of [PtIICl4]2- by [IrIVCl6]2- in acidic medium." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/95481.

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14

Rehal, Reg. "A physicochemical and biophysical investigation into the role of lysyl- phosphatidylglycerol in the membrane of Staphylococcus aureus under mild acidic conditions." Thesis, King's College London (University of London), 2014. https://kclpure.kcl.ac.uk/portal/en/theses/a-physicochemical-and-biophysical-investigation-into-the-role-of-lysyl-phosphatidylglycerol-in-the-membrane-of-staphylococcus-aureus-under-mild-acidic-conditions(187fad13-3e3f-4664-9ebd-6c85b67b50e4).html.

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Background: Staphylococcus aureus readily colonises human epithelia despite the presence of innate defences including mild acidity and cationic antimicrobial peptides (CAMPs). Reduced sensitivity of S. aureus to these defences appears partly due to the increased biosynthesis of lysyl-phosphatidylglycerol (L-PG) in its plasma membrane. The precise mechanisms by which L-PG facilitates tolerance to acidity and CAMPs remain under-investigated, due to the lipid’s lability in mild aqueous conditions. This study examines the role of L-PG in responses to epithelial defences and describes the synthesis

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15

Poulter, Rachel. "Investigating the role of soil constraints on the water balance of some annual and perennial systems in a Mediterranean environment." University of Western Australia. Faculty of Agriculture, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0018.

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This thesis compares the in situ water balance of common annual production systems (wheat, lupin, subclover and serradella) with a grazed perennial system (lucerne) at a site in the Avon Catchment, Western Australia. Using a physically-based water balance approach the value of a plant based solution in redressing the hydrological imbalance that has become a feature of much of the dryland agricultural region of Western Australia is investigated. The effectiveness of lucerne in providing greater available storage for buffering large rainfall events, as compared to the annual systems, is illustra

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16

Ahn, John [Verfasser], Johannes A. [Akademischer Betreuer] Lercher, and Hartmut [Akademischer Betreuer] Spliethoff. "Investigation into the reaction of toluene methylation to p-xylene over acidic zeolites / John Ahn. Gutachter: Johannes A. Lercher ; Hartmut Spliethoff. Betreuer: Johannes A. Lercher." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1037430948/34.

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17

Geiger, Simon [Verfasser], Karl J. J. [Gutachter] Mayrhofer, and Wolfgang [Gutachter] Schuhmann. "Stability investigations of iridium-based catalysts towards acidic water splitting / Simon Geiger ; Gutachter: Karl J. J. Mayrhofer, Wolfgang Schuhmann ; Fakultät für Chemie und Biochemie." Bochum : Ruhr-Universität Bochum, 2018. http://d-nb.info/1154307751/34.

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18

Shrestha, Dilesh Raj. "Bearing condition monitoring : An investigation on the possibility of monitoring aging of the lubricating grease by means of acoustic emission and temperature." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-87220.

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Grease is among the most widely used lubricants in rolling element bearings. Proper understanding of the effect of lubrication due to grease aging can provide a significant increase in the life of the engineering systems. However, at present, there is no sufficient understanding of the grease aging effect in rolling elements bearing. This restricts the optimal usage of the bearing and timely monitoring of the grease. The current research work tries to address this issue with an experimental investigation. This project studies the behavior of 4 types of greases in rolling elements bearings for

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19

Ndoro, Esina Tambudzayi. "A laboratory and glasshouse investigation on the effect of liming with fly ash and processed stainless steel slag on two contrasting South African soils." Thesis, 2008. http://hdl.handle.net/10413/414.

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20

Kuo, Hsiao-Ching, and 郭小靖. "Multinuclear NMR Measurements for the Investigation of Solvent Characterization and Structural Difference between Acetone and Dimethyl Sulfoxide. / Solvent Effect on the Sensitivity of Liquid Acidity Characterization by Trimethylphosphine Oxide." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/79551741544785374064.

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碩士<br>中原大學<br>化學研究所<br>102<br>Liquid state NMR could be used for molecular-level analysis. There are two major topics in this thesis to study molecular structure and solvent effect mainly by multinuclear NMR experiments (17O and 31P), 1H diffusion experiments and viscosity measurements. The first topic is solvent characteristic analysis of dimethyl sulfoxide (DMSO) and acetone. The structures of DMSO and acetone is almost the same but center atom. It’s hard to explain the large difference of chemical and physical properties between DMSO and acetone. 1H and  13C of DMSO and acetone are simila

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21

Gregory, Kasimir Phennah. "A quantum chemical investigation of Hofmeister effects in non-aqueous solvents." Thesis, 2022. http://hdl.handle.net/1959.13/1460595.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Specific ion effects (SIEs) encompass any phenomenon induced by ions that is dependent on the identity of the ions, and not just their charge or concentration. These occur in salts, electrolyte solutions, ionic liquids, acids and bases and have been known for over 130 years, from which the Hofmeister series originated. They are important in biology, nutrition, electrochemistry and various interfacial or geophysico-phenomena. It is perhaps harder to find a “real-world” system in which specific ion effects don’t occur, than systems where they do

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22

Reid, Joanne Lynne. "Investigating the long-term effects of air pollution on soil properties in the vicinity of the Arnot power station." Thesis, 2008. http://hdl.handle.net/10539/4875.

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A study was conducted in 2006 to investigate the long-term effects of air pollution on soil properties in the vicinity of the Arnot power station, Mpumalanga, South Africa. Fifteen sites were re-sampled and the soil chemical properties compared to baseline data gathered in 1996, resulting in a ten year period after which changes in soil properties were investigated. A spatial gradient was incorporated into the study in order to better understand the deposition of pollutants with increasing distance from the power station. The study indicates that long-term acidic deposition has led to detecta

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23

KATHIR, KARUPPANAN MUTHUSAMY, and 卡細亞. "Investigation of the Stability and Folding of the Acidic Fibroblast Growth Factor." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/83352533328677618215.

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博士<br>國立清華大學<br>化學系<br>91<br>In this study, the stability and folding of Acidic Fibroblast Growth Factor (nFGF-1) is described. nFGF-1 is a ~15kDa, all beta-barrel protein which play key roles in several important cellular processes related to morphogenesis, development and angiogenesis. The conformational stability of the nFGF-1 have been determined by urea denaturation and thermal denaturation using fluorescence and far-UV CD (Circular Dichroism) spectroscopy. To investigate the internal motions, hydrogen-deuterium exchange experiments in the absence and pre

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24

Samuel, D., and 詹淼爾. "Investigation of folding and unfolding pathway(s) of human acidic fibroblast growth factor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/05803041990831030323.

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博士<br>國立清華大學<br>化學系<br>88<br>The present study describes the characterization of the unfolding and refolding pathways of the acidic human fibroblast growth factor (hFGF-1). The first chapter provides an updated, concise but in-depth introduction to the various topics which are relevant to the research elaborated in this study. The second chapter of the thesis reports the expression, purification and characterization of hFGF-1. A detailed account of the identification and characterization of an equilibrium intermediate is provided in Chapter-III of the thesis. It is found that hFGF-1 exists in

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25

"Investigation on strategy and mechanism of adaptation to acidic soil in roots of forest trees." Thesis, 2004. http://hdl.handle.net/2237/6824.

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26

Tomioka, Rie, and 利恵富岡. "Investigation on strategy and mechanism of adaptation to acidic soil in roots of forest trees." Thesis, 2004. http://hdl.handle.net/2237/6824.

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27

SZU, HUNG TAO, and 司洪濤. "The Investigation of Combustion Acidic Gas Removal Efficiency by In-Duct Dry Sorbent Injection Technology." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/60135519768802008303.

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碩士<br>國立中山大學<br>環境工程研究所<br>84<br>This study investigated the potential removal of acidic gases (SO2 and NO) from combustion waste gas by in duct dry sorbent injection. A laboratory-scale dry sorbent injection duct reactor was originally designed and constructed in this study. The experiments were conducted by the injection of hydraded lime (Ca(OH)2) and the humidification of flue gas with water spray at the downstream of dry sorbent injection port. The atomization of water into duct re

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28

Lindsay, Matthew. "Passive In Situ Treatment of Acidic and Neutral Mine Drainage: Field and Laboratory Investigations." Thesis, 2009. http://hdl.handle.net/10012/4872.

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Water quality degradation is the foremost environmental issue faced by the mining industry. Negative impacts on water quality are commonly associated with unmitigated drainage emanating from sulfide-bearing mine waste deposits. These impacts stem from the liberation of acidity, sulfate, metals (e.g. Fe, Ni, Cu, Zn and Pb), and trace elements (e.g. Co, As, Cd, Sb and Tl) during the oxidation of sulfide minerals. Drainage at operational mines is commonly treated using techniques such as chemical oxidation and acid neutralization, which can succeed in achieving regulatory discharge guidelines. Ho

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29

Withers, Ryan. "Investigation of the transcription complex in Acinetobacter baylyi ADP1 and the identification of a novel small acidic transcription factor AtfA." Thesis, 2013. http://hdl.handle.net/1959.13/937522.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Transcription is an essential process by which DNA is transcribed into RNA by the multi-subunit enzyme RNA polymerase (RNAP). In prokaryotes, a single species of RNAP is responsible for the transcription of all forms of RNA (mRNA, rRNA and tRNA). Previous studies have shown that RNAP forms an extensive network of proteinprotein interactions that help regulate the efficiency of transcription. Little is known about transcription and its regulation in the Acinetobacter spp. This group of bacteria have become notorious in recent years for their ab

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30

Alhaddad, Maha. "Investigation on the reactivity of 1,3-bis (chloromethyl) tetramethyl disiloxane: 1-Interaction with Lewis acidic metal salts. 2-Application on Ionic Liquids." Diss., 2018. http://hdl.handle.net/10754/628074.

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This research explored the amination reaction of 1,3-bis-chloromethyl-tetramethyl-disiloxane in two different pathways. First, will discuss the synthesis of a new bipodal amino siloxane ligand which was achieved by the reaction of bis-chloromethyl-tetramethyl-disiloxane with t-BuNH3 in the presence of n-BuLi. The new ligand, of t-Butyl-[3-(t-butylamino-methyl)-1,1,3,3-tetramethyl disiloxanylmethyl]-amine (L1), is a model ligand designed to simulate the SOMC model of silica support and bipodal amido ligand that has been presented by the Basset group. Hence, developing this type of siloxane liga

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Sonego, Sandra. "A study of the effects of chronic neuroinflammation on cognition and behaviour in the GFAP-IL6 transgenic mouse and investigation of the flavonoid apigenin as a neuroprotective agent." Thesis, 2018. http://hdl.handle.net/1959.7/uws:51288.

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Neuroinflammation is a prominent feature of most neurodegenerative and affective disorders and has been increasingly implicated as a contributing factor in the disease development. The inflammatory process is closely linked with multiple neurodegenerative pathways and represents an important therapeutic target in halting or reversing disease progression. This study explored the cognitive and behavioural effects of chronic neuroinflammation in the glial fibrillary acidic protein promoter-interleukin 6 (GFAP-IL6) transgenic mouse in which the pro-inflammatory cytokine interleukin 6 (IL-6) is ove

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32

Mullan, Bernadette Jane. "Investigation into the acidic protein fraction of bovine whey and its effect on bone cells : a thesis presented in partial fulfilment of the requirements for the degree of Masters of Science in Chemistry at Massey University, New Zealand EMBARGOED till 1 December 2015." 2010. http://hdl.handle.net/10179/1415.

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Milk is provided to new borns as their first food source and it contains essential nutrients, vitamins and other beneficial components, such as enzymes and antibodies that are required for rapid growth and development of the new born and for sustained growth over time. Milk contains two main types of proteins; casein proteins and whey proteins. Although casein proteins account for up to 80% of the proteins found in bovine milk, it is the whey protein that has become of high interest because of its bioactive content. Whey, a very watery mixture of lactose, proteins, minerals and trace amounts o

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