Дисертації з теми "Polar liquid"
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Karmakar, Achintya. "Dispersion and absorption phenomena of dipolar liquid in nonpolar solvent." Thesis, University of North Bengal, 2007. http://hdl.handle.net/123456789/662.
Повний текст джерелаBleasdale, Thomas Anthony. "Surfactant liquid crystals in a range of polar solvents." Thesis, University of Salford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334033.
Повний текст джерелаDale, Alan David. "The oxidation of highly polar stationary phases in gas-liquid chromatography." Thesis, University of Hertfordshire, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254484.
Повний текст джерелаDhakal, Subas. "Statistical Mechanics of Polar, Biaxial and Chiral Order in Liquid Crystals." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1277740472.
Повний текст джерелаRoss, P. "The use of porous graphitic carbon in liquid chromatography performance and polar retention effect." Thesis, University of Edinburgh, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529492.
Повний текст джерелаScapello, Justin Thomas. "Solvent extraction of a polar solute using colloidal liquid aphrons : stability, equilibrium and mass transfer." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265955.
Повний текст джерелаMa, Wai Tang. "Analysis of polar nitroaromatics in groundwater by using solid-phase extraction and liquid chromatography-mass spectrometry." HKBU Institutional Repository, 2004. http://repository.hkbu.edu.hk/etd_ra/581.
Повний текст джерелаFILHO, JOAQUIM IGNACIO BAPTISTA CARDOSO. "QUANTIFICATION OF NI AND V IN POLAR FRACTIONS OF CRUDE OIL USING LIQUID CHROMATOGRAPHY AND ICPMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=15413@1.
Повний текст джерелаNi e V ocorrem em frações polares de óleos brutos e são de interesse geoquímico. Um método foi desenvolvido para isolar e quantificar esses metais associados a compostos orgânicos chamados porfirinas, usando-se cromatografia líquida e espectrometria de massa com plasma indutivamente acoplado (ICPMS). A fração do óleo contendo parafinas, aromáticos e polares foi separada usando-se uma coluna de vidro de 25 cm x 2,5 cm preenchida com sílica gel, empregando-se um programa automatizado de gradiente de eluição com ordem crescente da polaridade dos solventes. O eluido foi analisado por espectrofotometria UV-vis e o cromatograma obtido permitiu a distinção de três frações, que foram analisadas separadamente por ICPMS. O sistema de introdução de amostra do ICPMS consistiu em um micronebulizador concêntrico de Teflon acoplado a uma câmara refrigerada a - 14 ºC. Oxigênio foi introduzido no gás de nebulização (Ar) para evitar a formação de carbono na interface do instrumento. As condições operacionais foram otimizadas por planejamento experimental. A vazão de Ar foi de 0,46 L min(-1) e a de O2 foi de 0,1 L min(-1), a 1350 W. Os limites de detecção para o V e o Ni foram de 29 e 465 ng L(-1) respectivamente. A concentração de Ni foi de (7,1 +- 0,8), (16,8 +- 1,6) e (12 +- 2) ug g-1 para as frações 1, 2 e 3 respectivamente. O V foi quase que exclusivamente encontrado na terceira fração (mais polar) com (30 + 3) ug g(-1). Esses resultados sugerem a associação do V com frações mais pesadas do óleo.
Ni and V occur in the polar fraction of crude oils and have geochemical interest. A method was developed for isolating and quantifying these metals associated with organic compounds like porphyrins, using liquid chromatography and inductively coupled plasma mass spectrometry (ICPMS). The oil fraction containing paraffins, aromatics and polars was separated using a glass column of 25 cm x 2.5 cm filled with silica gel. An automatic elution program was used to create a solvent elution gradient of increasing polarity. The column eluate were analyzed by UV-vis spectrophotometry and the chromatograms obtained showed the separation of three fractions, which were then analyzed separately by ICPMS. The ICPMS sample introduction system consisted of a concentric Teflon micronebulizer coupled to a refrigerated spray chamber set to - 14 ºC. Oxygen was introduced into the nebulization gas flow to prevent de formation of carbon at the instrument interface. Operational conditions were optimized by experimental design. The optimum gas flow rates were 0.46 L min - 1 (Ar) and 0.1 L min - 1 (O2), at 1350 W.
Ghosh, Nilanjan. "Structural and associational aspects of some dielectropolar liquid molecules in non polar solvents from relaxation phenomena." Thesis, University of North Bengal, 2002. http://hdl.handle.net/123456789/670.
Повний текст джерелаJohnston, Stephen Jaye. "Molecular dynamics studies of a generalised multipole model of molecular asymmetry in apolar and polar liquid crystals." Thesis, Coventry University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369971.
Повний текст джерелаRussell, J. J. "Development of generic methods for the analysis and purification of polar compounds by high performance liquid chromatography." Thesis, University of the West of England, Bristol, 2016. http://eprints.uwe.ac.uk/28136/.
Повний текст джерелаQuach, Van. "Evaluation of polar-embedded reversed-phase liquid chromatography columns and the temperature dependence of the phase ratio." Tallahassee, Fla. : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-09012009-164008/.
Повний текст джерелаAdvisor: John G. Dorsey, Florida State University, College of Arts and Sciences, Dept. of Chemistry and Biochemistry. Title and description from dissertation home page (viewed Mar. 5, 2010). Document formatted into pages; contains x, 99 pages. Includes bibliographical references.
Salas, Acosta Daniela. "Strategies to improve the determination of polar compounds in environmental waters." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/401584.
Повний текст джерелаLa presente Tesis Doctoral describe la aplicación de estrategias recientes, enfocadas en mejorar la determinación de compuestos polares, para desarrollar nuevos métodos para el análisis de aguas ambientales. Estas estrategias se aplican en dos técnicas alternativas, desarrolladas para solventar los problemas asociados a compuestos polares: la cromatografía de líquidos de interacción hidrofílica (HILIC) y la extracción en fase sólida utilizando sorbentes poliméricos de intercambio iónico de modo mixto. Los mecanismos de retención en HILIC, influencia de los parámetros cromatográficos, ventajas, y su acoplamiento a la espectrometría de masas de alta resolución, fueron investigados para contaminantes poco estudiados por este modo cromatográfico alternativo. La aplicación de sorbentes de modo mixto fue ampliada más allá de sus usos convencionales, proponiendo su aplicación para la extracción selectiva de compuestos neutros capaces de establecer dipolos inducidos, y la extracción simultánea y selectiva de compuestos básicos y ácidos. Esta última fue lograda bien sea combinando físicamente los materiales o preparando sorbentes nuevos con carácter zwitteriónico.
This Doctoral Thesis describes the application of recent strategies focused on improving the determination of polar compounds, to develop new methods for the analysis of environmental waters. These strategies are applied in two alternative techniques developed to address problems associated to polar compounds: hydrophilic interaction liquid chromatography (HILIC) and solid-phase extraction using mixed-mode ion-exchange polymeric sorbents. The HILIC retention mechanisms, influence of chromatographic parameters, advantages and its coupling with high-resolution mass spectrometry, were investigated for contaminants seldom studied by this alternative chromatographic mode. The application of mixed-mode sorbents was broadened beyond their conventional uses, proposing their application for the selective extraction of neutral compounds capable of establishing induced dipoles, and the simultaneous and selective extraction of basic and acidic compounds. The latter was achieved by either physically combining the materials or preparing new sorbents with zwitterionic character.
Miao, Yiqing. "Compositional viscosity and microfiltration properties of ionic liquid-polar solvent mixtures and investigation of ionic liquids as enzyme carrier for bioreactions in a membrane reactor." Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546429.
Повний текст джерелаBennett, Raffeal. "Gradient Enhanced Fluidity Liquid Chromatography using the Hydrophilic Interaction Separation Mode." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500995708235286.
Повний текст джерелаSamskog, Jenny. "Development of Micro Liquid Separation Techniques using Electrospray Ionisation Mass Spectrometry in the Analysis of Polar Compounds and Proteins/Peptides." Doctoral thesis, Uppsala University, Analytical Chemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3304.
Повний текст джерелаElectrospray ionisation (ESI) coupled to mass spectrometry (MS) is one of the most important detection techniques for chemical analysis of small drugs as well as large biomolecules in life science today. In this thesis, aspects on improved compatibility between liquid based separation systems and mass spectrometric detection were investigated regarding buffers, sample preparation and analysis of polar compounds as well as peptides and protein digests for enhanced ESI-MS performance.
Capillary electrophoresis (CE) coupled to ESI-MS detection, was evaluated using both a sheath flow interface and a sheathless design. The separation of peptides and small, polar compounds was optimised for both CE-ESI interfaces. The effect of sheath liquid composition was also studied with the aim to improve sensitivity in the ESI-MS detection.
Polar compounds were retained and separated by capillary ion-pair chromatography coupled to ESI-MS detection. Since commonly used ion-pairing reagents are detrimental to the ESI process they were effectively removed before the ionisation by the use of a trapping column after the separation. Alternatively, the ion-pairing reagents were exchanged to volatile constituents.
A method for peptide mapping by liquid chromatography (LC)-ESI-MS was developed for lactate dehydrogenase. The method was further enhanced to involve the proteolysis on-line to the LC-ESI-MS. No manual sample handling was then needed and the total analysis time decreased from 7 to 1.5 hours. The amount of information was also shown to increase in the on-line system.
Finally, the on-line concept was extended to an innovative interface for direct coupling of a pumped liquid flow to an electroosmotically driven flow. This provided a valve-free sample transfer between capillary LC and CE, aiming towards increased peak capacity per unit time for the analysis of complex peptide samples.
Rosa, Rafaela Raupp da. "Isoxazolinas e isoxazóis como reais candidatos na preparação de cristais líquidos polares." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/180639.
Повний текст джерелаThis thesis describe the synthesis and characterization of 10 new series of banana shaped molecules containing the isoxazoline and isoxazole rings as real players for preparation of polar liquid crystals. It was evaluate structural parameters such as the type of connecting function of the bent core with the mesogenic arms, the heterocycle nature and its position relative to the central core. The synthesis of the compounds included the methodology of preparation of the isoxazoline ring, the [3 + 2] 1,3-dipolar cycloaddition between alkenes and nitrile oxides, which were generated by the oximes prepared from aliphatic and aromatic aldehydes. Furthermore, all isoxazolines were oxidized to its respective isoxazoles using manganese dioxide. Besides the described methodologies, alkylation, reduction, deprotection, hydrogenolysis, olefination, addition of amines to the aldehydes and esterification reactions were used. All the synthesized molecules were characterized by 1H NMR and 13C NMR, and also observed by POM for determination of its melting points. The molecules previously analyzed by POM that showed mesomorphic behavior were characterized by DSC, XRD and triangular voltage still. Chapter 3 describes the synthesis of isophthalates 19a-b, 20a-b, 26a-b e 27a-b. In the subgroup of isophthalates derived from isoxazoles and isoxazolines 3,5-diarylsubstituted it was possible to synthesize only compound 11d which did not show liquid crystalline behavior In the subgroup of the isophthalates derived from isoxazoles and isoxazolines 3-alkyl-5-arylsubstituted the isoxazolines 19a-b did not show liquid crystalline behavior. It was found mesophases for compounds 20a-b that still could not be determined with the available techniques. The isoxazoles 20a-b presented a probable Blue Phase soon after cooling from the isotropic which quickly converts into a probable ferroelectric monotropic mesophase with peculiar textures and pattern of XRD until then not observed in the literature. In the subgroup of the isophthalates of isoxazoles and isoxazolines 3-aryl-5-alkylsubstituted 26a-b and 27a-b no liquid crystalline behavior was observed. Chapter 4 describes the synthesis of isophthalimines 35, 36, 44, 45, 50a-b, 51a-b, 56a-d, 57a-d, 63a-b and 64a-b. In the subgroup of the isoxazoles 3,5-diarylsubstituted 35, 36, 44 and 45 the B7 and B1 mesophases were observed only with the inversion of the isoxazole ring orientation as mesogenic arm of thefinal compounds whereas the isoxazolines did not present mesophases. The B7 mesophase of the compound 36 showed antiferroelectric switching while the B1 mesophase of the compound 45 showed no response to the applied electric field, in addition, the XRD showed that such B1 columnar mesophase could be a 3D modulated phase one. In the subgroup of 3-alkyl-5-arylsubstituted isoxazolines and isoxazoles 50a-b and 51a-b DC phases were observed for isoxazolines 50a-b which should be confirmed by FFTEM. The SmXPF mesophase were observed for componds 56b-d in the subgroup of 3-aryl-5-alkylsubstituted materials 56a-d, 57a-d, 63a-b e 64a-b. The isoxazoles 57a-d presented similar textures although did not showed mesophase, but they follow the same diffraction pattern of the chapter 3 isoxazolines. Only the isoxazoline 63b of the perfluorinated compounds showed mesophase In chapter 5 is described the synthesis of non-symmetric esters containing isoxazol and isoxazolines heterocycles as central core 71a-f, 82, 83, 84 e 85. In the first subgroup all the cinnamic esters 71a-f showed mesomorphic behavior with large mesophases temperature ranges. In the second subgroup the isoxazolines 82 and 83 showed completely different behavior which only was observed the SmB mesophase formation for compound having the ester position towards the heterocycle nitrogen. Furthermore, the isoxazoles 84 and 85 of this subgroup showed the N and SmC mesophases at very similar temperatures, however, the observation of these materials in an aligned cell revealed the filamentary growth in the N-SmC transition only for compound 85, which also has the ester moiety in the direction of the isoxazole ring nitrogen. Chapter 6 brings forward the synthesis of symmetrical esters and imines 88, 89, 94 and 95 using the heterocycles as the central cores, which showed SmC and N mesophases. Moreover, the isoxazole derived diester 89 showed the same feature as compound 85 of Chapter 5, exhibiting a N-SmC transition with filament growth perpendicular to the rubbing direction of the cell which may be related to a NTB mesophase.
Magnér, Jörgen. "Methodologies to assess the fate of polar organic compounds in aquatic environments." Doctoral thesis, Stockholms universitet, Institutionen för tillämpad miljövetenskap (ITM), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-35552.
Повний текст джерелаThis research was financially supported by European Union (European Commission, FP6 Contract No. 003956) “Novel Methods for Integrated Risk Assessment of Cumulative Stressors in the Environment” (NoMiracle) and by the Swedish research council Formas.
Kujawinski, Dorothea [Verfasser], Torsten Claus [Akademischer Betreuer] Schmidt, and Oliver J. [Akademischer Betreuer] Schmitz. "Liquid Chromatography coupled to Isotope Ratio Mass Spectrometry of Selected Polar Compounds / Dorothea Kujawinski. Gutachter: Oliver J. Schmitz. Betreuer: Torsten Claus Schmidt." Duisburg, 2014. http://d-nb.info/1064580912/34.
Повний текст джерелаArroyo-Mora, Luis. "Environmental analysis of polar herbicides in complex organic-rich matrices by high performance liquid chromatography atmospheric pressure ionization mass spectrometry (HPLC-API-MS)." FIU Digital Commons, 2003. http://digitalcommons.fiu.edu/etd/1425.
Повний текст джерелаEspinosa, Carlos Esteban. "Screened electrostatic interaction of charged colloidal particles in nonpolar liquids." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34820.
Повний текст джерелаCartwright, Richard. "Analysis of Channel Networks and the Potential for Sediment Transport in the Vicinity of the North Polar Seas of Titan." Digital Archive @ GSU, 2009. http://digitalarchive.gsu.edu/geosciences_theses/20.
Повний текст джерелаRosa, Paulo César Pires 1976. "Preparação, caracterização da fase estacionária C8, com grupo polar uréia embutido e aplicações na análise e no desenvolvimento e validação de métodos para determinação de fármacos." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250527.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-08-17T10:43:43Z (GMT). No. of bitstreams: 1 Rosa_PauloCesarPires_D.pdf: 2764513 bytes, checksum: 8ef702d050c47af34e60cf2218efa939 (MD5) Previous issue date: 2010
Resumo: Neste trabalho, desenvolveu-se uma nova fase estacionária (FE) (-NH-C(O)-NH-C8) capeada, contendo o grupo polar uréia inserido na cadeia alquila C8. Os estudos de análise elementar, espectroscopia infravermelho, ressonância magnética nuclear de C e Si confirmaram o sucesso da síntese da FE. A FE foi preparada e foi caracterizada cromatograficamente na separação de misturas testes e de diversas classes de fármacos, no desenvolvimento e validação de métodos para avaliação de misturas de estatinas em cápsulas, clobutinol e doxilamina em xarope e para determinação de impurezas e produtos de degradação dos fármacos alprazolam e cloxazolam. As colunas recheadas com a FE Si-C8-uréia proporcionaram boas separações, com eficiências entre 60.000 e 80.000 pratos m e picos simétricos, especialmente para compostos básicos. O comportamento da nova FE foi comparado com os das FE comerciais, obtendo desempenho semelhante na separação de misturas testes e de fármacos, como furoato de mometasona em creme, conservantes como os alquilparabenos, clonazepam e impurezas, valerato de betametasona, clioquinol e tolnaftato em creme, dropropizina em xarope, mistura de paracetamol, cafeína e ácido acetisalicílico em comprimidos e mistura de cefalexina, prilocaína e amitriptilina. A FE Si-C8-uréia apresentou boa aplicabilidade na separação de fármacos devido ao grupo uréia reduzir a interação dos compostos básicos com os silanóis residuais. Dessa forma, a nova FE possui potencialidade para ser empregada em laboratórios de pesquisa e controle de qualidade, especialmente na análise de compostos básicos
Abstract: In this work, it a new end-capped stationary phase (SP) containing a urea polar group inserted into the C8 alkil chain (-NH-C(O)-NH-C8) was prepared. Elementar analysis, infrared spectroscopy and C and Si nuclear magnetic ressonance allowed confirmation of the success of the synthesis of the SP. The new SP was chromatographically caracterizeded by the separation of test mixtures and of different types of pharmaceutical compounds, in the development and validation of methods for analysis of a mixture of statins in capsules, clobutinol hydrochloride and doxilamine in syrups and for determination of impurities and degradation products of the pharmaceutical compounds alprazolam and cloxazolam. Columns containing Si-C8-urea SP showed good separations, with efficiencies between 60 000 and 80 000 plates.m and symmetrical peaks, especially for basic compounds. The behavior of the new SP was compared with commercially available SP and the results showed similar behaviors for separation of test mixtures and of pharmaceutical compounds such as mometasone furoate in creams, preservatives like alkylparabens, clonazepam and impurities, bethametasone valerate, clioquinol and tolnaftate in creams, dropropizine in syrup, mixtures of acetaminophen, caffeine and aspirin in tablets and mixtures of cefalexin, prilocaine and amitriptiline. The Si-C8-urea SP showed good applicability for separation of pharmaceutical compounds due to the urea group reducing the interaction of basic analytes with the residual silanols. Thus, the new SP has the potencial to be employed in research and for quality control, especially for the analyses of basic pharmaceutical compounds
Doutorado
Quimica Analitica
Doutor em Ciências
Dong, Wei. "Contribution a l'etude theorique de la structure d'un fluide polaire et d'une solution electrolytique au voisinage d'une surface solide." Paris 6, 1987. http://www.theses.fr/1987PA066340.
Повний текст джерелаTörnkvist, Anna. "Aspects of Porous Graphitic Carbon as Packing Material in Capillary Liquid Chromatography." Doctoral thesis, Uppsala University, Analytical Chemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3306.
Повний текст джерелаIn this thesis, porous graphitic carbon (PGC) has been used as packing material in packed capillary liquid chromatography. The unique chromatographic properties of PGC has been studied in some detail and applied to different analytical challenges using both electrospray ionization-mass spectrometry (ESI-MS) and ultra violet (UV) absorbance detection.
The crucial importance of disengaging the conductive PGC chromatographic separation media from the high voltage mass spectrometric interface has been shown. In the absence of a grounded point between the column and ESI emitter, a current through the column was present, and changed retention behaviors for 3-O-methyl-DOPA and tyrosine were observed. An alteration of the chromatographic properties was also seen when PGC was chemically oxidized with permanganate, possibly due to an oxidation of the few surface groups present on the PGC material.
The dynamic adsorption of the chiral selector lasalocid onto the PGC support resulted in a useful and stable chiral stationary phase. Extraordinary enantioselectivity was observed for 1-(1-naphthyl)ethylamine, and enantioseparation was also achieved for other amines, amino acids, acids and alcohols.
Finally, a new strategy for separation of small biologically active compounds in plasma and brain tissue has been developed. With PGC as stationary phase it was possible to utilize a mobile phase of high content of organic modifier, without the addition of ion-pairing agents, and still selectively separate the analytes.
Basak, Rabindra Chandra. "Dielectric behaviour of some polar liquids under high frequency electric field." Thesis, University of North Bengal, 2000. http://hdl.handle.net/123456789/643.
Повний текст джерелаSaha, Ujjwal. "Dielectric relaxation parameters of polar liquids from ultra-high frequency conductivity of solutes in non-polar solvents." Thesis, University of North Bengal, 1993. http://hdl.handle.net/123456789/660.
Повний текст джерелаRussier, Vincent. "Contribution à la description théorique de l'interface métal noble / solution électrolytique." Paris 6, 1986. https://hal.science/tel-04577395v1.
Повний текст джерелаTheoretical description of the interface between a noble metal and an electrolytic solution. The description of the solution-wall solid interface is described by the "civilized" model in which the molecules are hard spheres bearing a point dipole and the ions of charged hard spheres. Determination of the density profile of dipoles when they interact with the surface and the density profile of ions. For noble-vacuum metal interface, calculation of output work and surface energy. Use of a simple model to treat the surface and account for hybridization s/d
Geyer, Delphine. "Du mouvement au blocage collectif dans des assemblées de rouleurs colloïdaux : hydrodynamique et solidification des liquides polaires actifs." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEN026/document.
Повний текст джерелаSpontaneous collective motion arises in many different systems, from assembly of synthetic shaken grains to living bird flocks. In order to understand the generic features of those collective behaviours, physisicts describe the flocks of motile units as ordered materials. In this thesis we study experimentally the dynamics of synthetic flocks and explore their hydrodynamic properties. We take advantage of the Quincke mechanism to motorize millions of colloids. Those Quincke rollers self-organize into a polar liquid, where all the particles, on average flow in the same direction. We provide the first experimental proof that the dynamics of polar liquids is well described by a theoretical prediction established more than twenty-five years ago. In particular, we demonstrate that two sound modes propagate along all directions of the fluid and we design a non invasive spectroscopic method to measure its hydrodynamics constants.Finally, we show that collective motion can be arrested in a dense flock. An active solid can nucleate, grow and propagate in a polar liquid. We establish that this solidification is a first order phase transition and demonstrate that the formation of this active solid is the first experimental proof of a complete motility induced phase separation of active particles (also known as MIPS)
Bratkowska, Dominika. "Development and application of new polymeric materials for sorptive extraction techniques." Doctoral thesis, Universitat Rovira i Virgili, 2011. http://hdl.handle.net/10803/63173.
Повний текст джерелаThe development of different materials for sorptive extraction techniques is a continuously evolving field of research. Although there have been significant developments in this area, the extraction of polar analytes is still considered the bottleneck of the extraction process. The efforts have been undertaken to improve capacity and selectivity. For this reason, one of the main objectives of this Thesis is to develop new materials to extract polar organic contaminants from water samples. The first part reports on the development of new polymeric materials for solid-phase extraction including hypercrosslinked polymers with hydrophilic character, mixed-mode ion-exchange hypercrosslinked sorbents and supported ionic liquid polymeric phases and their evaluation as SPE sorbents for the extraction of polar contaminants, followed by LC analysis. The second part is focused on the preparation of new stir bars with polar monolithic coatings and their application to stir bar sorptive extract polar analytes from environmental water samples.
Bleazard, Joseph Gibson. "The thermal conductivity of aqueous electrolyte solutions and polar liquids." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/33419.
Повний текст джерелаBraun, Heiko [Verfasser]. "Simulation of the phase behavior in polar model liquids / Heiko Braun." Wuppertal : Universitätsbibliothek Wuppertal, 2015. http://d-nb.info/108143001X/34.
Повний текст джерелаReighard, Tricia Susan. "Extraction of polar pollutants using supercritical fluids and enhanced-fluidity liquids /." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487940308432287.
Повний текст джерелаHaughney, Michael Francis. "A molecular dynamics study of selected polar liquids and their aqueous mixtures." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254062.
Повний текст джерелаHunger, Johannes. "Effects of polar compounds on the dynamics and dielectric properties of room-temperature ionic liquids." kostenfrei, 2009. http://epub.uni-regensburg.de/11973/.
Повний текст джерелаКоробко, Олександр Анатолійович. "Удосконалення резонансного діелькометричного методу контролю та визначення вологості рідких неполярних діелектриків". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40781.
Повний текст джерелаThesis for a candidate degree (PhD) in specialty 05.11.13 "Instruments and methods of control and determination of substances" (15 – Automation and Instrumentation) − National Technical University "Kharkiv Polytechnic Institute". The thesis is devoted to the improvement of the resonant dielectric method of monitoring and determining the humidity of emulsions such as liquid non-polar dielectric - water in order to increase its sensitivity to level 10⁻⁵ while simultaneously minimizing the type and grade of non-polar dielectric ("varietal uncertainty") on the measurement results. An analytical review and analysis of the existing methods and means of implementation of the dielectric method in general and its resonant variety has been carried out. The main research areas have been identified: development of a simplified emulsion model; development of new varieties of the resonant dielectric method with minimization of the effect of "varietal uncertainty" for measuring humidity at a level of 10⁻⁵; development of a new type of distributed transducer. A simplified emulsion model was chosen based on the Kok artificial dielectric model, its applications were determined by frequency, humidity, and the values of its systematic errors were determined. New multifrequency varieties of the resonant dielectric method have been developed based on the proposed mathematical model of the emulsion, taking into account the parasitic capacitances of the measuring generator and the measuring converter. Metrological characteristics of the generalized four-frequency method and its simplified three-and two-frequency varieties are obtained. The areas of applicability of multifrequency methods are analyzed and their systematic errors are determined. The most sensitive method, the two-frequency method, was determined, the effect of dielectric losses in water was analyzed for it, and the generation frequency of the measuring generator, which corresponds to its maximum sensitivity, 100 MHz, was determined. A new type of distributed-type measuring transducer is proposed for the practical implementation of the two-frequency method — a stepwise heterogeneous coaxial resonator; its theoretical and experimental studies are carried out; its advantages in relation to the known transducers are determined. A hygrometer of the mid-frequency range based on a concentrated-type capacitive transducer and a hydrometer of a very high-frequency range based on a stepped heterogeneous coaxial resonator have been developed. The circuit solutions of the measuring transducer and the measuring generator of the hygrometer of the midfrequency range, which provided the minimum values of their parasitic capacitances, were developed and implemented. The circuit solutions of the measuring transducer and the measuring generator of a hygrometer of a very high frequency range have been developed and implemented, which provided almost zero effect of their parasitic capacitances. A methodology has been developed for conducting experimental research on the implementation of four- and three-frequency methods using a mid-range moisture meter and implementing a two-frequency method and a simplified version of it using a very high-frequency moisture meter. Experimental studies on manufactured test emulsions, as well as analysis and processing of their results, were carried out. For all developed multi-frequency methods and moisture values of test emulsions in the range of 10⁻⁴ – 10⁻², the value of the relative extended uncertainty of moisture measurement did not exceed 5.28 %. For the humidity of the test emulsion 10⁻⁵, the value of this uncertainty did not exceed 10.39 % (due to the lack of stability of the frequency of the reference generator frequency Ch 3 - 34, which was used in the research). The developed improved multi-frequency resonance dielectric methods for determining humidity have increased the sensitivity to a level of 10⁻⁵ while minimizing "varietal uncertainty".
Коробко, Олександр Анатолійович. "Удосконалення резонансного діелькометричного методу контролю та визначення вологості рідких неполярних діелектриків". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40783.
Повний текст джерелаThesis for a candidate degree (PhD) in specialty 05.11.13 "Instruments and methods of control and determination of substances" (15 – Automation and Instrumentation) − National Technical University "Kharkiv Polytechnic Institute". The thesis is devoted to the improvement of the resonant dielectric method of monitoring and determining the humidity of emulsions such as liquid non-polar dielectric - water in order to increase its sensitivity to level 10⁻⁵ while simultaneously minimizing the type and grade of non-polar dielectric ("varietal uncertainty") on the measurement results. An analytical review and analysis of the existing methods and means of implementation of the dielectric method in general and its resonant variety has been carried out. The main research areas have been identified: development of a simplified emulsion model; development of new varieties of the resonant dielectric method with minimization of the effect of "varietal uncertainty" for measuring humidity at a level of 10⁻⁵; development of a new type of distributed transducer. A simplified emulsion model was chosen based on the Kok artificial dielectric model, its applications were determined by frequency, humidity, and the values of its systematic errors were determined. New multifrequency varieties of the resonant dielectric method have been developed based on the proposed mathematical model of the emulsion, taking into account the parasitic capacitances of the measuring generator and the measuring converter. Metrological characteristics of the generalized four-frequency method and its simplified three-and two-frequency varieties are obtained. The areas of applicability of multifrequency methods are analyzed and their systematic errors are determined. The most sensitive method, the two-frequency method, was determined, the effect of dielectric losses in water was analyzed for it, and the generation frequency of the measuring generator, which corresponds to its maximum sensitivity, 100 MHz, was determined. A new type of distributed-type measuring transducer is proposed for the practical implementation of the two-frequency method — a stepwise heterogeneous coaxial resonator; its theoretical and experimental studies are carried out; its advantages in relation to the known transducers are determined. A hygrometer of the mid-frequency range based on a concentrated-type capacitive transducer and a hydrometer of a very high-frequency range based on a stepped heterogeneous coaxial resonator have been developed. The circuit solutions of the measuring transducer and the measuring generator of the hygrometer of the midfrequency range, which provided the minimum values of their parasitic capacitances, were developed and implemented. The circuit solutions of the measuring transducer and the measuring generator of a hygrometer of a very high frequency range have been developed and implemented, which provided almost zero effect of their parasitic capacitances. A methodology has been developed for conducting experimental research on the implementation of four- and three-frequency methods using a mid-range moisture meter and implementing a two-frequency method and a simplified version of it using a very high-frequency moisture meter. Experimental studies on manufactured test emulsions, as well as analysis and processing of their results, were carried out. For all developed multi-frequency methods and moisture values of test emulsions in the range of 10⁻⁴ – 10⁻², the value of the relative extended uncertainty of moisture measurement did not exceed 5.28 %. For the humidity of the test emulsion 10⁻⁵, the value of this uncertainty did not exceed 10.39 % (due to the lack of stability of the frequency of the reference generator frequency Ch 3 - 34, which was used in the research). The developed improved multi-frequency resonance dielectric methods for determining humidity have increased the sensitivity to a level of 10⁻⁵ while minimizing "varietal uncertainty".
Marth, Wieland. "Hydrodynamic Diffuse Interface Models for Cell Morphology and Motility." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-204651.
Повний текст джерелаDiese Dissertation beschäftigt sich mit mathematischen Modellen zur Beschreibung von Gleichgewichts- und dynamischen Zuständen von verallgemeinerten biologischen Zellen. Die Zellen werden dabei als thermodynamisches System aufgefasst, bei dem Strömungseffekte innerhalb und außerhalb der Zelle zusammen mit einem Helfrich-Modell für Zellmembranen kombiniert werden. Schließlich werden durch einen Energie-Variations-Ansatz die Evolutionsgleichungen für die Zelle hergeleitet. Es ergeben sie dabei Mehrphasen-Systeme, die Strömungseffekte mit einem freien Randwertproblem, das zusätzlich physikalischen Einflüssen wie Biegung und Oberflächenspannung unterliegt, vereinen. Um solche Probleme effizient zu lösen, wird in dieser Arbeit die Diffuse-Interface-Methode verwendet. Ein Vorteil dieser Methode ist, dass es sehr einfach möglich ist, Modelle, die verschiedenste Prozesse beschreiben, miteinander zu vereinen. Dies erlaubt es, komplexe biologische Phänomene, wie zum Beispiel Zellmotilität oder auch die kollektive Bewegung von Zellen, zu beschreiben. In den Modellen für Zellmotilität wird ein biologisches Netzwerk-Modell für GTPasen oder auch ein Active-Polar-Gel-Modell, das die Aktinfilamente im Inneren der Zellen als Flüssigkristall auffasst, mit dem Multi-Phasen-Modell kombiniert. Beide Modelle erlauben es, komplexe Vorgänge bei der selbst hervorgerufenen Bewegung von Zellen, wie das Vorantreiben der Zellmembran durch Aktinpolymerisierung oder auch die Kontraktionsbewegung des Zellkörpers durch kontraktile Spannungen innerhalb des Zytoskelets der Zelle, zu verstehen. Weiterhin ist die kollektive Bewegung von vielen Zellen von großem Interesse, da sich hier viele nichtlineare Phänomene zeigen. Um das Diffuse-Interface-Modell für eine Zelle auf die Beschreibung mehrerer Zellen zu übertragen, werden mehrere Phasenfelder eingeführt, die die Zellen jeweils kennzeichnen. Schließlich werden die Zellen durch ein lokales Abstoßungspotential gekoppelt. Das Modell wird angewendet, um White blood cell margination, das die Annäherung von Leukozyten an die Blutgefäßwand bezeichnet, zu verstehen. Dieser Prozess wird dabei bestimmt durch den komplexen Zusammenhang zwischen Kollisionen, den jeweiligen mechanischen Eigenschaften der Zellen, sowie deren Auftriebskraft innerhalb der Adern. Die Simulationen zeigen, dass diese Annäherung sich in bestimmten Gebieten des kardiovaskulären Systems stark vermindert, in denen die Blutströmung das Stokes-Regime verlässt. Schließlich wird das Active-Polar-Gel-Modell mit dem Modell für die kollektive Bewegung vom Zellen kombiniert. Dies macht es möglich, die kollektive Bewegung der Zellen und den Einfluss von Hydrodynamik auf diese Bewegung zu untersuchen. Es zeigt sich dabei, dass der Zustand der kollektiven gerichteten Bewegung sich spontan aus der Neuausrichtung der jeweiligen Zellen durch inelastische Kollisionen ergibt. Obwohl die Hydrodynamik einen großen Einfluss auf solche Systeme hat, deuten die Simulationen nicht daraufhin, dass Hydrodynamik die kollektive Bewegung vollständig unterdrückt. Weiterhin wird in dieser Arbeit gezeigt, wie die stark gekoppelten Systeme numerisch gelöst werden können mit Hilfe der Finiten-Elemente-Methode und wie die Effizienz der Methode gesteigert werden kann durch die Anwendung von Operator-Splitting-Techniken und Problemparallelisierung mittels OPENMP
Ponnaiyan, Thehazhnan Konguvel Ponnaiyan. "Aspects Critical to Advancing Ionic Liquid Pretreatment Technique as a Viable Approach for Lignocellulosic Biomass Conversion." University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1471652917.
Повний текст джерелаBOUDH-HIR, MOHAMED ESSALAH. "Contribution a l'etude theorique de la structure et de la thermodynamique d'un fluide polaire au voisinage d'une surface." Paris 6, 1987. http://www.theses.fr/1987PA066040.
Повний текст джерелаBony, Nicaise françois. "Stratégie analytique des tradimédicaments : établissement de profils chromatographiques des métabolites phytochimiques apolaires." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00906762.
Повний текст джерелаPožar, Martina. "On the nature of structural fluctuations in complex liquids." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS269.
Повний текст джерелаThe analysis of different types of structuring, present in simple and complex liquids and their mixtures, was done using the method of molecular dynamics. Complex mixtures have at least one associative component, such as water, alcohols (mono-ols and diols) and amines. The supra-molecular structuring in these mixtures is detected, described, quantified and connected with the atom-atom interactions is the molecules. These systems have interesting fluctuation behaviors, as shown through Kirkwood-Buff integrals. Their correlation functions behave in a complex way, depending on the component, concentration and temperature. The pre-peak at small k values in the site-site structure factor is defined as a signature of molecular domains in these mixtures. A special focus is placed on long-range structuring, which is a novelty considering the majority of the work in the field of the physics of liquids. This thesis contributes to a better understanding of micro-heterogeneous structures in molecular liquids, and gives new links to structural heterogeneities in soft and bio-matter
Okello, Maurice O. "Polar ionic media and stabilized charged species in organic synthesis ionic liquids derived from a biorenewable source, d-fructose, as a possible alternative to conventional organic reaction solvents /." Diss., Online access via UMI:, 2004. http://wwwlib.umi.com/dissertations/fullcit/3150493.
Повний текст джерелаAgapov, Alexander. "Decoupling Phenomena in Dynamics of Soft Matter." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1321922264.
Повний текст джерелаYANG, HONG-ZHAN, and 楊洪展. "Molecular dynamics calculation of polar polyatomic molecular liquid." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/55533260315069145706.
Повний текст джерелаLin, Yu-siang, and 林鈺翔. "The Effect of Polar Substituents on Bent-Core Liquid Crystals." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/69522840976599742204.
Повний текст джерела國立中央大學
化學研究所
95
It is well known that the stability of the mesophase may be augmented by an increase of the polarity or polarization along the mesogenic core of the molecule. A substantial change of the micro- as well as macro-polarizability in a specific structure or molecule can be easily achieved by the introduction of polar substituent along the preferred molecular direction. The effect of polar substituents in a variety of mesogenic systems has been studied and investigated during the past years. Certain predictions were successfully made in terms of mesomorphic behavior. Previous studies also showed that compounds substituted with polar groups, such as -NO2, -CN, might lead to a higher clearing temperature. This effect was attributed to the conjugative interaction increased between the substituent and the ester moiety. On the other hand, the effect of polar substituents on the mesogenic 1,3,4-oxadiazoles was studied. The mesophase and optical properties of these oxadiazole materials were found to be strongly influenced by the presence of a terminal polar group. N,N’-Bis[1-(4’-alkoxyphenyl)-3oxopropenyl]-2-hydroxypropylenediamines and their Pd2+ complexes were previously prepared and found to exhibit columnar phase (Colh) in this group. However, the mesomorphic behavior of the ligands formed smectic phase due to the shape effect. In this work, a series of the similar structures with a variety of polar substituents, so-called bent-core (BC) mesogen was prepared and studied. All compounds were found mesogenic, and the mesophase was assigned tentatively as banana phases.
Udo, Motonari, and 宇土基成. "Synthesis and Characterization of New Polar-Substituted Pyridine-Containing Liquid Crystalline Compound." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/11454637496741421341.
Повний текст джерела輔仁大學
化學系
89
This study describes an efficient approach to synthesize pyridine-containing liquid crystalline compounds by using of 4-alkylphenyl magnesium bromide to react with alkyl or aryl N-ethoxycarbonylnicotinium chloride and subsequent oxidation by o-chloranil to give regioselective alkyl or aryl 6-(4-alkylphenyl)nicotinates in a fair yield.
Tsai, Shao-Ling, та 蔡韶玲. "β-Diketone, Pyrazole and Isoxazole Derivatives with Polar Groups: Liquid Crystalline and Thermodynamic Properties". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/66543881468988295014.
Повний текст джерела國立中央大學
化學研究所
95
In this serie, we report the synthesis, characterization and mesomorphic properties of two series of new mesogenic derivatives based on pyrazole and isoxazole structures. All compounds were characterized by 1H, 13C-NMR spectroscopy and elemental analysis. The phase behaviors of these mesogenic compounds were characterized and studied by differential scanning calorimeter (DSC) and polarization optical microscope. In serie one, a new type of mesogenic compounds derived from heterocyclic pyrazole and isoxazole (Iz-Cn) were prepared and studied. All compounds exhibited smectic phases depending on the carbon length attached. Replacing hydrogen atom of pyrazole by methyl group (Mpz-Cn), ethanol group (Epz-Cn) and pyridinal group (Ppz-Cn) were carried out and the mesomorphic behavior studied. In serie two, we designed and characterized a series of asymmetrical of organic molecules Hpz-Cn-OH derived from pyrazole with one side chains. These compounds exhibited smectic phases.
Chen, Shao-Yu, and 陳劭瑜. "From Pure Component Properties to Calculate Vapor-Liquid Equilibrium of Binary Non-polar Mixtures." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/8pesde.
Повний текст джерела國立臺北科技大學
化學工程研究所
96
The phase behavior of vapor-liquid equilibrium and thermodynamics properties of mixtures are important for distillation separation processes, Pseudocritical rules have been developed which enable the calculation of vapor-liquid equilibrium (VLE) values and thermodynamic properties for nonpolar mixtures for wide ranges of temperatures and pressures. Interaction constants of mixtures are obtained by procedures for the calculation of interaction second virial coefficient with relationships for the Kihara spherical core potential with generalized correlation of Tee、Gotoh and Stewart for nonpolar fluids. For nonpolar mixtures, the Lee-Kesler equation of state is employed with the pseudocrtical constants of the system to determine the fugacities of the components in gaseous and liquid phases. They only input data required for these procedures are the critical temperature and pressure and acentric factor for nonpolar components. The binary nonpolar mixtures bubble pressure calculations were tested. Excellent results are obtained for VLE values, particularly for mixtures containing dissimilar components such as the methane/n-heptane and methane/n-octane systems.
Harrar, Agnes [Verfasser]. "An ionic liquid as polar phase in low-temperature-stable microemulsions / vorgelegt von Agnes Harrar." 2011. http://d-nb.info/1010969781/34.
Повний текст джерела