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Insights into the Interfacial Chemistry in Systems Involving Iron Oxides.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Insights into the Interfacial Chemistry in Systems Involving Iron Oxides./
作者:	Chen, Xining.
面頁冊數:	1 online resource (276 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-10, Section: B.
Contained By:	Dissertations Abstracts International84-10B.
標題:	Humidity. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30347154click for full text (PQDT)
ISBN:	9798377673835

Insights into the Interfacial Chemistry in Systems Involving Iron Oxides.
Chen, Xining.

Insights into the Interfacial Chemistry in Systems Involving Iron Oxides. - 1 online resource (276 pages)

Source: Dissertations Abstracts International, Volume: 84-10, Section: B.

Thesis (Ph.D.)--McGill University (Canada), 2022.

Includes bibliographical references

This thesis examined the nanoscale interfacial chemistry in different systems involving magnetic iron oxides. Part one of the thesis studies the degradation of carbonyl iron microparticles in hydrocarbon or fluorocarbon magnetorheological smart fluid media after experiencing continual mechanical shear in clutch devices. X-ray photoelectron spectroscopy (XPS) is the technique of choice because it provides depth-resolved profiles of elemental-specific oxidation states of surface and sub-surface species. The combination of XPS with scanning electron microscope (SEM) reveals how the morphological changes of iron particles are related to reactions involving adventitious oxygen and chemical substituents in the host fluid. Such reactions produced a surface layer of iron oxides and iron fluorides encapsulating the particles. The surface layers, accompanied by shear-induced collisions in the clutch environment, lead to nanoscale changes in surface topography and redistributions of surface and sub-surface chemical species.Part two of the thesis compares carboxylated cellulose nanocrystal (CNC) cryogel porous scaffolds with iron oxide nanoparticle-incorporated cellulose nanocrystal cryogel scaffolds. The cryogel scaffolds are produced using unidirectional freezing processes that employ high and low freezing temperatures, and freeze-thawing. The influence of an applied magnetic field on freezing is also investigated. SEM reveals morphologies of the resulting scaffolds. Pore size distributions are analyzed using the local thickness method. Furthermore, the nanoscopic structure of CNC in the scaffolds is studied using small-angle x-ray scattering (SAXS), and the results are correlated with water sorption data obtained via dynamic water sorption (DVS). It is observed that iron oxide incorporated CNC scaffolds have reduced water sorption. This observation correlates with the increased compactness within nanocrystals containing iron oxide-grafted CNCs.Part three of the thesis redirects attention to polarized Raman spectroscopy in integrated optical waveguides. The integrated optics technique involved guiding a polarized incoming laser beam into a waveguide through prism coupling. Two waveguide setups are examined. The first setup uses glass waveguides with surface decorations of plasmonic gold-silver core-shell nanoparticles (Au AgNPs) configured as glass optical chemical bench (OCB) sensing elements. We implemented TE-TM polarized guided wave surface-enhanced Raman spectroscopy as a nanoplasmonic waveguide sensor to probe inter-ligand soft-soft interactions between magnetic nanoparticles and nanoplasmonic AuAg NPs.The second setup is hybrid organic-inorganic sol-gel glass waveguides for investigating induced optical anisotropy inside the waveguide medium. In one experiment, we demonstrated that a polarization-induced refractive index change can be "written" by guiding polarized waves in the hybrid glass medium in the form of a spatially localized self-inscribed waveguide. We examined TE-TM mode conversion by "reading" mode conversion through changes in polarized C-H stretch vibrations of the hybrid glass. We furthered our experiment by "writing" a gyroscopic nanocomposite waveguide comprising magnetite nanoparticles in the host glass. Our attempt to detect non-Faraday effect mode-conversion in the waveguide, although inconclusive at this time, calls for exploration of new theories to describe mode conversion in lossy gyrotropic waveguide media.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798377673835Subjects--Topical Terms:

3559498
Humidity.
Index Terms--Genre/Form:

542853
Electronic books.

Insights into the Interfacial Chemistry in Systems Involving Iron Oxides.
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500 $a Source: Dissertations Abstracts International, Volume: 84-10, Section: B.
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502 $a Thesis (Ph.D.)--McGill University (Canada), 2022.
504 $a Includes bibliographical references
520 $a This thesis examined the nanoscale interfacial chemistry in different systems involving magnetic iron oxides. Part one of the thesis studies the degradation of carbonyl iron microparticles in hydrocarbon or fluorocarbon magnetorheological smart fluid media after experiencing continual mechanical shear in clutch devices. X-ray photoelectron spectroscopy (XPS) is the technique of choice because it provides depth-resolved profiles of elemental-specific oxidation states of surface and sub-surface species. The combination of XPS with scanning electron microscope (SEM) reveals how the morphological changes of iron particles are related to reactions involving adventitious oxygen and chemical substituents in the host fluid. Such reactions produced a surface layer of iron oxides and iron fluorides encapsulating the particles. The surface layers, accompanied by shear-induced collisions in the clutch environment, lead to nanoscale changes in surface topography and redistributions of surface and sub-surface chemical species.Part two of the thesis compares carboxylated cellulose nanocrystal (CNC) cryogel porous scaffolds with iron oxide nanoparticle-incorporated cellulose nanocrystal cryogel scaffolds. The cryogel scaffolds are produced using unidirectional freezing processes that employ high and low freezing temperatures, and freeze-thawing. The influence of an applied magnetic field on freezing is also investigated. SEM reveals morphologies of the resulting scaffolds. Pore size distributions are analyzed using the local thickness method. Furthermore, the nanoscopic structure of CNC in the scaffolds is studied using small-angle x-ray scattering (SAXS), and the results are correlated with water sorption data obtained via dynamic water sorption (DVS). It is observed that iron oxide incorporated CNC scaffolds have reduced water sorption. This observation correlates with the increased compactness within nanocrystals containing iron oxide-grafted CNCs.Part three of the thesis redirects attention to polarized Raman spectroscopy in integrated optical waveguides. The integrated optics technique involved guiding a polarized incoming laser beam into a waveguide through prism coupling. Two waveguide setups are examined. The first setup uses glass waveguides with surface decorations of plasmonic gold-silver core-shell nanoparticles (Au AgNPs) configured as glass optical chemical bench (OCB) sensing elements. We implemented TE-TM polarized guided wave surface-enhanced Raman spectroscopy as a nanoplasmonic waveguide sensor to probe inter-ligand soft-soft interactions between magnetic nanoparticles and nanoplasmonic AuAg NPs.The second setup is hybrid organic-inorganic sol-gel glass waveguides for investigating induced optical anisotropy inside the waveguide medium. In one experiment, we demonstrated that a polarization-induced refractive index change can be "written" by guiding polarized waves in the hybrid glass medium in the form of a spatially localized self-inscribed waveguide. We examined TE-TM mode conversion by "reading" mode conversion through changes in polarized C-H stretch vibrations of the hybrid glass. We furthered our experiment by "writing" a gyroscopic nanocomposite waveguide comprising magnetite nanoparticles in the host glass. Our attempt to detect non-Faraday effect mode-conversion in the waveguide, although inconclusive at this time, calls for exploration of new theories to describe mode conversion in lossy gyrotropic waveguide media.
520 $a Cette these examine la chimie interfaciale a l'echelle nanometrique dans differents systemes impliquant des oxydes de fer magnetiques. La premiere partie de la these etudie la degradation des microparticules de fer carbonyle dans des milieux fluides intelligents magnetorheologiques d'hydrocarbures ou de fluorocarbures apres avoir subi un cisaillement mecanique continu dans des dispositifs d'embrayage. La spectroscopie photoelectronique a rayons X (XPS) est la technique de choix car elle fournit des profils resolus en profondeur des etats d'oxydation specifiques aux elements des especes de surface et de sub-surface. La combinaison de la XPS avec le microscope electronique a balayage (MEB) revele comment les changements morphologiques des particules de fer sont lies aux reactions impliquant l'oxygene fortuit et les substituants chimiques dans le fluide hote. Ces reactions ont produit une couche superficielle d'oxydes et de fluorures de fer encapsulant les particules. Les couches de surface, accompagnees de collisions induites par le cisaillement dans le milieu d'embrayage, entrainent des changements a l'echelle nanometrique dans la topographie de la surface et des redistributions des especes chimiques de surface et de sub-surface.La deuxieme partie de la these compare les echafaudages poreux de cryogels de nanocristaux de cellulose carboxyles (CNC) avec les echafaudages de cryogels de nanocristaux de cellulose incorpores de nanoparticules d'oxyde de fer. Les echafaudages de cryogel sont produits a l'aide de processus de congelation unidirectionnels qui utilisent des temperatures de congelation elevees et basses, ainsi que la congelation-decongelation. L'influence d'un champ magnetique applique sur la congelation est egalement etudiee. Le MEB revele les morphologies des echafaudages obtenus. La distribution de la taille des pores est analysee par la methode de l'epaisseur locale. De plus, la structure nanoscopique des CNC dans les echafaudages est etudiee en utilisant la diffusion des rayons X aux petits angles (SAXS), et les resultats sont correles avec les donnees de sorption de l'eau obtenues par sorption dynamique de l'eau (DVS). On observe que les echafaudages CNC incorpores d'oxyde de fer ont une sorption d'eau reduite. Cette observation est en correlation avec l'augmentation de la compacite des nanocristaux contenant des CNC greffes a l'oxyde de fer.La troisieme partie de la these redirige l'attention vers la spectroscopie Raman polarisee dans des guides d'ondes optiques integres. La technique de l'optique integree consiste a guider un faisceau laser entrant polarise dans un guide d'ondes par couplage de prismes. Deux configurations de guides d'ondes sont examinees. La premiere configuration utilise des guides d'ondes en verre avec des decorations de surface de nanoparticules plasmoniques or-argent a coeur-coquille (Au AgNPs) configurees comme des elements de detection de banc chimique optique (OCB) en verre. Nous avons mis en oeuvre la spectroscopie Raman amelioree en surface par ondes guidees polarisees TE-TM comme capteur de guide d'ondes nanoplasmonique pour sonder les interactions douces inter-ligands entre les nanoparticules magnetiques et les nanoparticules AuAg nanoplasmoniques.
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