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Tesi sul tema "Surface chemistry"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Bishop, Alexander James. "Actinide surface chemistry." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54193/.

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The surface reactivity of thorium and uranium, and how this links to the 5f electrons, has been investigated under UHV conditions using X-ray photoelectron spectroscopy (XPS), ultra violet photoelectron spectroscopy (UPS), and inverse photoemission spectroscopy (IPES).  Water and ammonia adsorption on a polycrystalline thorium surface has been investigated at 100 and 298 K.  Water adsorbs and dissociates upon the surface, leading to the formation of oxide and hydroxide species at 298 K, and oxide, hydroxide, and physisorbed water at 100 K. The surfaces after adsorption at both temper

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2

Cooper, Philip Andrew. "Surface chemistry of foams." Thesis, University of Hull, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335544.

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3

Cole, D. J. "Surface chemistry and adhesive properties of oxidised Si surfaces." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597835.

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I have used density functional theory and classical molecular dynamics to study the chemistry of the native oxide layer on the Si(100) surface. Surface oxidation is accompanied by the development of tensile surface stress and by formation of Si species with a range of oxidation states. Total energy calculations of P and B substitution into the oxide layer and first principles molecular dynamics simulations of oxide growth on the doped surface both indicate a surface oxidation mechanism whereby impurities remain trapped at the Si/SiO<i><sub>x</sub></i> interface. A new two- and three-body class

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4

Brown, Ken D. "The surface chemistry of beryllium." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333978.

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5

Sirbu, Elena. "Surface chemistry of cellulose nanocrystals." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33308/.

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Chemical surface modification of cellulose nanocrystals has had a fast development and increased interest from the scientific community as cellulose is the most abundantly available renewable polymer with many advantages such as nanoscale dimensions, high specific strength and modulus, high surface area, unique optical properties and the extraordinary modification potential to increase the application field. This thesis is aimed at expanding and improving upon the current knowledge in order to unlock new applications. Four esterification techniques were applied to the formation of cellulose na

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6

Shukla, Nisha. "Surface spectroscopic studies of coadsorbed molecules and surface reactions at single crystal metal surfaces." Thesis, Cardiff University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275212.

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7

Lu, Jian Ren. "The surface chemistry of emulsion breakdown." Thesis, University of Hull, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384850.

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8

McElroy, Daniel. "Grain surface chemistry in molecular clouds." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602462.

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This work ia a study of chemistry in molecular clouds. I begin by describing the improvements made to gas phase chemical reaction data in the recent release of the UMIST database for astrochemistry (Rate 12). Improvements to the reaction network include the addition of anions, new reaction rate coefficient and branching rate measurements across all reactions types and newly calculated photodissociation and photoionisation rates.

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9

Daud, A. R. "The surface chemistry of pitting corrosion." Thesis, University of Surrey, 1985. http://epubs.surrey.ac.uk/770155/.

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The use of XPS and AFS technique has been explored in the stLrly of the surface chemistry of a whole electrode surface (XPS) and the surface chemistry of natural pits (AFS). EDXA and to a snall extend SIMS were also used in the investigation of the individual pits. A high resolution Auger electron microscope which has an analytical resolution as snall as 0.1 .un enables a nevly formed pit of less than 2 .un in diameter to be investigated. By using a Cl/Mg ratio an attempt had been made to correlate the surface chemistry of whole electrodes exposed at different potentials in 1M MgCl2 solution t

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10

Szczepankiewicz, Steven Henry Hoffmann Michael R. "Surface chemistry of titanium dioxide photocatalysts /." Diss., Pasadena, Calif. : California Institute of Technology, 2001. http://resolver.caltech.edu/CaltechETD:etd-05232006-094537.

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11

Tidwell, Caren Diana. "Endothelial cell interactions with model surfaces : effect of surface chemistry, surface mobility, and the adsorbed protein layer /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/8004.

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12

Hamilton, Douglas W. "The effects of surface topography and surface chemistry on chondrocyte behaviour." Thesis, University of Glasgow, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368577.

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13

Martínez, Esaín Jordi. "The surface chemistry of metal fluoride nanocrystals." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/665606.

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Primerament, la síntesis de quinze tipus de nanocristalls inorgànics i la tendència general dels nanocristalls de fluorurs metàl·lics ha estat satisfactòriament desentranyada. Utilitzant el mètode de la coprecipitació, es reporta la fàcil, ràpida i reproduïble síntesis de nanocristalls de LnF3 i el detallat estudi mecanístic de les diferents condicions sintètiques. Mitjançant el complert estudi de la química de superfície, un nou tipus de self-assembly iònic en sistemes col·loidals ha estat proposat. Utilitzant mètodes experimentals i simulacions de dinàmica molecular, es postula aquest me

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14

René-Boisneuf, Laetitia. "Probing Surface Chemistry at the Nanoscale Level." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20453.

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Studies various nanostructured materials have gained considerable interest within the past several decades. This novel class of materials has opened up a new realm of possibilities, both for the fundamental comprehension of matter, but also for innovative applications. The size-dependent effect observed for these systems often lies in their interaction with the surrounding environment and understanding such interactions is the pivotal point for the investigations undertaken in this thesis. Three families of nanoparticles are analyzed: semiconductor quantum dots, metallic silver nanoparticles a

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15

Furman, Scott Anthony. "Surface chemistry of iodine on platinum (111)." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ36639.pdf.

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16

Tasker, Simon. "The surface chemistry of polymeric bioseparation materials." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5333/.

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The aim of this thesis was to test existing theories concerning biocompatibility of polymeric materials, and in the process to try and identify the major factors which pertain to their use as bioseparation matrices. The surface chemistry of cellulose and poly(tetrafluoroethyIene) based bioseparation materials have been examined. We have been able to demonstrate a direct link in the case of the cellulose materials between the crystallinity and the accessibility of the hydroxyl groups which are the primary sites of functionalization. In addition, the effect of processing conditions on the pore s

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17

Adriaens, D. A. "Theoretical investigations of surface chemistry in space." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/18506/.

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In this Thesis, computational models for carbonaceous dust grains were examined and compared to known experimental data. Different formation routes of molecules, important to the astrochemical evolution of the universe, have been investigated and their relative energies were analysed with respect to the harsh conditions in interstellar dark clouds of extremely low pressure (10‐17 bar) and temperature (10 – 20 K). Dust grains are present in the universe, and evidence shows they are siliceous or carbonaceous, possible with an icy mantle surrounding the core. In this research, only carbonaceous s

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18

Goodwin, Julian A. S. "Surface chemistry in the activated sludge process." Thesis, University of Birmingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365891.

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19

Michalak, David Jason Gray Harry B. "Physics and chemistry of silicon surface passivation /." Diss., Pasadena, Calif. : Caltech, 2006. http://resolver.caltech.edu/CaltechETD:etd-05082006-074414.

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20

Das, Ujjal. "Electronic structure studies of semiconductor surface chemistry and aluminum oxide cluster chemistry." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3344570.

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Thesis (Ph. D.)--Indiana University, Dept. of Chemistry, 2008.<br>Title from PDF t.p. (viewed Oct. 7, 2009). Source: Dissertation Abstracts International, Volume: 70-02, Section: B, page: 1054. Adviser: Krishnan Raghavachari.

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21

Andrews, Marilyn Mockus 1958. "Characterization of the surface acidity of passivated iron particles by flow microcalorimetry." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276614.

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Abstract (sommario):

The characteristics of passivated iron particles have been examined with flow microcalorimetry to determine the acidic nature of the surface sites. The molar heat of adsorption of pyridine from hexane was measured with a FMC and a differential refractive index detector, at 23 and 40°C. The adsorption data were found to obey the assumptions of the Freundlich isotherm. The adsorption densities at different temperatures were used to calculate the isosteric heat of adsorption. The molar heat of adsorption of triethylamine from hexane was also measured and combined with the data for pyridine in ord

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22

Poirier, Jason S. "Polymer Templating in Surfactant Monolayers." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/PoirierJS2004.pdf.

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23

Young, Aidan Gerard, and n/a. "Chemistry at cadmium sulfide surfaces." University of Otago. Department of Chemistry, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080806.164202.

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Probing the surface chemistry of thiol ligand binding to cadmium chalcogenide nanoparticles is important to clarify factors involved in quantum dot stability and surface functionalisation. This research is a spectroscopic investigation aimed at gaining a better understanding of the interaction/bonding of various ligands to CdS, with respect to the use of CdS in biological imaging. The findings of this research are important to the more general field of cadmium chalcogenide materials as biological imaging agents. Deposited CdS nanoparticle films were used in this work as model quantum dot sur

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24

Zhao, Jun. "Surface Raman spectroscopy : instrumentation and application in surface and corrosion sciences /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487948807588245.

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25

Barch, Mariya. "Molecular fluorescent reporters for force and smart surfaces for sensing cell-surface interaction." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55089.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 123-130).<br>Molecular sensors are powerful because they make it possible to adapt the measurement to the sample instead of a sample to an instrument. Many reporter are available for measuring the chemical properties of a sample, but no purpose-built molecular sensors exist to report a sample's mechanical properties. To address recent interest in the mechanical coordinate of molecular interactions, we developed a prototype molecul

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26

Ingram, Jani Cheri. "Surface-enhanced Raman scattering and electron spectroscopic studies of copper and silver surfaces." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185153.

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The overall goal of this research is to investigate the enhancement mechanisms associated with the surface enhanced Raman scattering (SERS) phenomenon. The approach taken in these investigations is to directly compare the SERS abilities of Cu and Ag surfaces using both SERS and electron spectroscopy. One set of experiments has been directed toward studying the contribution of the charge transfer (CT) mechanism to the SERS of pyridine adsorbed on Cu and Ag electrodes. These studies involve modifying the electrodes by depositing submonolayer amounts of Pb which serves to quench the SERS. By usin

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27

Adamkiewicz, Malgorzata. "Self-assembled monolayers on silicon : deposition and surface chemistry." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3938.

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Fabrication of surfaces with versatile functional groups is an important research area. Hence, it is essential to control and tune the surface properties in a reliable manner. Vinyl-terminated self-assembled monolayers (SAMs) offer significant flexibility for further chemical modification and can serve as a versatile starting point for tailoring of surface properties. Here a synthetic route for the preparation of vinyl-terminated trichlorosilane self-assembling molecules: 9-decenyltrichlorosilane (CH₂=CH-(CH₂)₈-SiCl₃), 10-undecenyltrichlorosilane (CH₂=CH-(CH₂)₉-SiCl₃), and 14-pentadecenyltrich

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28

Yan, Liling. "Effects of surface topography on hydrophobicity of surfaces with spherical micro-protusions." Thesis, The University of Sydney, 2005. https://hdl.handle.net/2123/27892.

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The water repellency of a surface is principally governed by a combination of its chemical nature (i.e. surface energy) and topographical microstructure. The surface energy is an intrinsic property of a material that can be controlled by chemical modification, and other factors that can affect wettability, especially the surface topography were investigated. In particular, the study of topographical factors influencing the wettability of solid films is very important in View of production of surfaces with tailored properties and functions. The main objective of this research was to in

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29

Ghahremaninezhad, Gharelar Ahmad. "The surface chemistry of chalcopyrite during electrochemical dissolution." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42830.

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Hydrometallurgy may be an alternative to the currently practiced smelting process for copper extraction from chalcopyrite (CuFeS₂). However, the low temperature hydrometallurgical processes for chalcopyrite continue to face challenges, mostly relating to their slow dissolution rates or high sulfuric acid production. The slow dissolution rate of the mineral is strongly linked to the formation of the passive film on its surface. However, despite 40 years of research on this topic, there is still not a complete agreement between researchers about the composition and stability of chalcopyrite’s pa

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30

Alvarez, Silva Mayeli. "Surface chemistry study on the pentlandite- serpentine system." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97112.

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Interaction with MgO-minerals is one mechanism suspected to reduce selectivity in flotation of pentlandite from ultramafic ore. Understanding the surface chemistry of the minerals involved will lead to improved flotation conditions that maximize flotation selectivity. The first part of the thesis compares isoelectric point (i.e.p.) and point of zero charge (p.z.c.) determined using Mular-Roberts [M-R] titration technique of MgO-minerals chlorite, serpentine and talc. The M-R technique was unsuccessful with talc, attributed to Mg2+ acting as potential determining ion. For serpentine and chlorit

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31

Roe, Gerard. "Surface and catalytic chemistry of Ni/Sm systems." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282064.

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32

Perera, S. P. "Gas chromatography and surface chemistry of porous polymers." Thesis, Brunel University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376652.

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33

Bennett, Andrew Michael. "Properties, processes and surface chemistry at diamond interfaces." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434867.

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34

Shin, Nae Chul. "Controlling semiconductor nanowire crystal structures via surface chemistry." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52966.

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This thesis introduces a new route to control the structure of semiconductor nanowires using surface chemistry. Specifically, in Au-catalyzed Si nanowire growth using hydride species (Si₂H₆) as growth precursors, we demonstrate that the surface hydrogen existing on the nanowires sidewalls affects the growth morphology. First, we show the spectroscopic evidence of atomic hydrogen bonded to sidewall surface of Si nanowires in real-time in situ during growth and correlate their relative change with different growth orientations and planar defect generation. By introducing additional atomic hydrog

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35

Stewart, Karen. "The chemistry layer of the surface of wool." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317119.

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36

Hart, Nicholas. "Surface chemistry of oxygenates over model platinum catalysts." Thesis, University of York, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431657.

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37

Marshall, Robert. "Preparation of bimetallic catalysts by surface organometallic chemistry." Thesis, Open University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265345.

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38

Rostam, Hassan Muhammad. "The impact of surface chemistry on macrophage polarisation." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39797/.

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Background: Antigen presenting cells (APCs) such as macrophages play a crucial role in orchestrating immune responses against foreign materials. The activation status of macrophages can determine the outcome of an immune response following implantation of synthetic materials, towards either healing or inflammation. A large range of biomaterials are used in the fabrication of implantable devices and drug delivery systems. These materials will be in close contact with APCs and characteristics such as surface chemistry may have a critical role in polarising macrophages towards pro- or anti-inflam

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39

Goetting, Laura Bridget 1970. "Electrochemistry and surface chemistry of self-assembled monolayers." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/85240.

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40

Farhan, Tamer. "Controlling surface topography & chemistry of polymer films." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612867.

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41

Haley, Roger David. "Surface chemistry of the vinyl acetate catalytic system." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/272089.

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42

Duckenfield, Kea U. "Laboratory oxide coatings: Physical form and surface chemistry." W&M ScholarWorks, 2003. https://scholarworks.wm.edu/etd/1539616635.

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The impact of dissolved trace metals on aquatic ecosystems and human health is controlled by sorption, i.e., binding to the surfaces of environmental particles. Since many environmental particles are coated with highly reactive substances, and since discrepancies in trace metal sorption behavior persist between oxides developed in the laboratory and environmental oxide phases, it was hypothesized that the physical form of oxide coatings may influence the chemical properties of the coated particle. Therefore, relationships between the physical forms of several different Fe(III) oxide coatings a

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43

Da, Silva Rodrigues Rafael Alexandre. "Dynamic covalent chemistry at the solution: Surface interface." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/200450/1/Rafael_Da%20Silva%20Rodrigues_Thesis.pdf.

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Mechanically interlocked architectures have shown great promise in applications such as catalysis, sensing and drug delivery. They have also been developed as the basis of molecular machinery. However, the use such systems often requires their incorporation to surfaces or solid supports for amplified concerted action and reusability. This research investigated new methods for the attachment of rotaxanes to polymer resins. By adopting a dynamic covalent approach to surface attachment, great improvements in proportion of rotaxanes, when compared to kinetic by-products, were achieved on polymer r

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44

Greene, George W. IV. "Surface modification of sintered porous polyethylene membrane." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/20126.

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45

Khan, Suleman Manawar. "Surface active lanthanide complexes for sensing applications on silica and gold surfaces." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5726/.

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The work presented in this thesis investigates the use of new luminescent lanthanide bis-amide DTPA complexes, both in solution and bound to gold and silica surfaces. The bis-amide arms have been modified with surface attachment groups consisting of disulphides, thioacetates and silyl ethers. Both sensitising and non-sensitising bisamides arms were attached to DTPA in order to develop the best lanthanide based sensor. When these visible and NIR emitting lanthanide complexes are bound to the surface they can be used to detect various small analytesm including benzoic acid, phthalic acid, isopht

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46

Parker, Emily M. "Surface active polymers as anti-infective and anti-biofouling materials." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:54e462df-b64c-499c-94ce-55d624be9a69.

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This thesis is concerned with the chemical modification of polymers in the preparation of a library of materials which exhibit altered surface properties as a result of the surface chemical functionality, with particular emphasis on the development of materials that control biofouling and are antibacterial. Chemical modification of crosslinked polystyrene, in film and microsphere form, was carried out by carbene insertion followed by diazonium coupling. This provided access to a collection of materials with varying surface chemistry, whilst the bulk properties of the polystyrene substrates wer

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47

Li, Qiang. "Surface Chemistry of Hexacyclic Aromatic Hydrocarbons on (2x1) and Modified Surfaces of Si(100)." Thesis, University of Waterloo, 2004. http://hdl.handle.net/10012/1263.

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Abstract (sommario):

Room-temperature chemisorption of hexacyclic aromatic hydrocarbons on the 2x1, sputtered, oxidized and H-terminated Si(100) surfaces, as well as those upon post treatments of hydrogenation, oxidization and electron irradiation have been investigated by using thermal desorption spectrometry (TDS), Auger electron spectroscopy (AES) and low energy electron diffraction (LEED). This work focuses on the effects of the functional groups (phenyl, methyl, vinyl, heteroatom, and H atom) in the chemisorbed aromatic hydrocarbons (benzene, toluene, xylene isomers, styrene and pyridine) on organic functi

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48

Park, Jung Hwa. "The role of surface chemistry and wettability of microtextured titanium surfaces in osteoblast differentiation." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44732.

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Biomaterial surface energy, chemical composition, charge, wettability and roughness all play an important role in determining the degree of the direct bone-to-implant interface, termed osseointegration. Surface chemistry, which is influenced by surface energy, wettability, and composition, is another factor that determines osteoblast phenotype and regulates osteoblast maturation. Increased surface energy is desirable for bone implants due to enhanced interaction between the implant surface and the biological environment. The extent of bone formation in vivo is also increased with increasing wa

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49

Wu, Xin 1967. "Probing colloidal forces with surface collisions." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40469.

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The principal objectives of this thesis are to introduce a new method, colloidal particle scattering (CPS), to measure colloidal and surface forces, and to demonstrate various applications of this method. CPS determines particle-particle interaction forces through creating particle collisions and extracting the interaction forces from the degree of asymmetry of the collision trajectories. Since the force to deflect a micron-sized particle is much smaller than that to deform a macroscopic spring or cantilever used in a commercial force apparatus, this new technique increases the resolution of f

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50

Golding, Randy Dale. "Synthesis and application of alkyl dihydrochlorosilanes: A new approach to the surface modification of porous silica." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184427.

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Three alkyldihydrochlorosilanes were synthesized; ethyldihydrochlorosilane, octyldihydrochlorosilane and octadecyldihydrosilane. Ethyldihydrochlorosilane was produced by the reaction of ethylsilane with mercuric chloride and the other two chlorosilanes were produced by the reaction of the alkyl Grignard reagent with dichlorosilane. Each alkyldihydrochlorosilane was reacted with porous silica in an attempt to discover the extent of reaction or the highest surface concentration of bonded groups attainable. The reaction between these alkydihydrochlorosilanes and porous silica was compared to the

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