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Dissertations / Theses on the topic 'Silicon hydrogel'

Author: Grafiati

Published: 9 October 2021

Last updated: 30 July 2025

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1

Zhao, Yibei. "Phospholipid Transport in Silicon Hydrogel Contact Lenses." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3083.

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Dry eye syndrome has been associated with the lack of phospholipids in the tear film, leading to disruption of the tear film and subsequent irritation. Characterization of the transport and release of phospholipids from a silicone hydrogel contact lens is required to assess the possible use of these lenses for phospholipid delivery to increase patient comfort. This thesis examines the use of silicone hydrogel contact lenses as phospholipid delivery devices. Contact lenses of silicone hydrogel composition were loaded with varying amounts of radiolabeled 1,2-dimyristoyl-sn-glycero-3-phosphocholi

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2

Rutschilling, Ryan R. "Evaluation of Wear Experience with Silicone Hydrogel Lenses in Current Silicone Hydrogel Planned Replacement Lens Wearers." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618559832574561.

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3

Augustine, Anusree. "Swelling induced debonding of thin hydrogel films grafted on silicon substrate : the role of interface physical-chemistry." Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLS040.

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Les revêtements d'hydrogel sont des réseaux de polymères transparents et hydrophiles capables d’abosrber plusieurs fois leur épaisseur en eau. Cependant, les contraintes induites par le gonflement du film peuvent entraîner un décollement préjudiciable de l'hydrogel ce qui peut limiter l’utilisation pratique des ces revêtements. Dans cette étude, nous proposons de décrire les mécanismes de décollement de films minces d’hydrogel en fonction de leur densité de greffage à l'interface film/substrat. Le but est de pouvoir contrôler et prédire la dégradation des revêtements hydrogel pendant le gonfle

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4

Osborn, Tim H. "Ab Initio Simulations of Hydrogen and Lithium Adsorption on Silicene." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1283177822.

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5

Kim, Hyoun-Ee. "Gaseous corrosion of silicon carbide and silicon nitride in hydrogen /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487327695622538.

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6

Huy. "Hydrogen interaction with impurities in silicon." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2001. http://dare.uva.nl/document/59764.

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7

Ghita, M. "Hydrogen diffusion and trapping in crystalline silicon." Thesis, Queen's University Belfast, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517282.

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8

Stübner, Ronald. "Electrical characterization of carbon-hydrogen complexes in silicon and silicon-germanium alloys." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-233055.

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In this thesis, a comprehensive study of the electrical properties of carbon-hydrogen (CH) complexes in silicon (Si) and silicon-germanium (SiGe) alloys is presented. These complexes form by the reaction of residual carbon impurities with hydrogen that is introduced either by wet chemical etching or a dc hydrogen plasma. The complexes were detected and characterized by the deep level transient spectroscopy (DLTS), Laplace DLTS, and minority carrier transient spectroscopy (MCTS) technique. With this approach, properties like the activation enthalpy for carrier emission, the capture cross sectio

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9

Rubido, Jacinto S. "Ocular response to silicone-hydrogel contact lenses." Thesis, Aston University, 2004. http://publications.aston.ac.uk/14538/.

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The thesis investigates the ocular response to silicone-hydrogel (SiH) contact lens wear, a relatively new contact lens material that has a higher modulus of rigidity and different surface coating than used in conventional hydrogel materials. The properties of SiH materials differ significantly from conventional hydrogels and, using subjective and objective means of assessment, the thesis examines how these properties affect reflection and biometry, ocular physiology, tear film characteristics, symptomatology, adverse events and complications. A range of standard and newly designed investigati

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10

Burrows, Michael Z. "Role of silicon hydride bonding environment in alpha-silicon hydrogen films for c-silicon surface passivation /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 152 p, 2008. http://proquest.umi.com/pqdweb?did=1654501711&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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11

Janson, Martin. "Hydrogen diffusion and ion implantation in silicon carbide." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3482.

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<p>Secondary ion mass spectrometry (SIMS) has been employed tostudy the spatial distributions resulting from mass transportby diffusion and ion implantation in single crystal siliconcarbide (SiC). By a systematic analysis of this data,fundamental processes that govern these phenomena have beenderived.</p><p>The acceptor atoms Al and B are known to be electricallypassivated by H in SiC. By studying the thermally stimulatedredistribution of implanted deuterium (2H) in various acceptordoped structures, it is found that hydrogen forms complexeswith the doping atoms, and also interacts strongly wit

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12

O'Connell, Jacques Herman. "Characterization of hydrogen and helium implanted silicon carbide." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/979.

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This dissertation focuses on the characterization of hydrogen implanted 3C-SiC and helium implanted 6H-SiC and the interaction of silver and palladium with the SiC. The main technique used for the analysis of the implanted SiC was transmission electron microscopy (TEM), although scanning electron microscopy (SEM) and nanoindentation hardness testing were also used. Both H and He implantations were done at an ion energy of 100 keV and the total dose for both species was 1017 ions/cm2. Specimens were annealed at 1000 °C for 20 min in an inert atmosphere. The observed depth of ion damage agreed c

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13

Bowyer, Ellis T. "Electrical detection of hydrogen-like donors in silicon." Thesis, University of Surrey, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616937.

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Quantum computers have been the dream of many scientists for over thirty years but the fact such devices still consist of only a handful of quantum bits (qubits) highlights the fact that this is not a trivial concept. However the potential of powerful parallelisation, which could out perform classical computers remains a huge incentive for researchers. Interest in donors in silicon has grown since being put forward as a possible candidate for a qubit in 1998 by Kane. Group V atoms, such as phosphorus, substitute into the silicon lattice but possess an extra outer shell electron compared to the

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14

Tam, Ngai Keung. "Comfort and Compatibility of Silicone Hydrogel Contact Lenses." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4031.

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Silicone Hydrogel (SiHy) contact lenses are highly successful compared to previous soft lenses; they were developed to provide superior oxygen permeability. However, the hydrophobic natures of the silicone segments enhance lipid sorption which may diminish the lens surface wettability, clarity and comfort. While lens and lens care product are designed to remove lipid deposition, there is lack of experimental evidence to evaluate the actual performances with respect to lipid removal. An in vitro model using an artificial tear fluid containing radiolabeled lipids was employed in this thesis rese

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15

Wilkinson, Andrew Richard. "The optical properties of silicon nanocrystals and the role of hydrogen passivation /." View thesis entry in Australian Digital Program, 2006. http://thesis.anu.edu.au/public/adt-ANU20060202.111537/index.html.

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16

Luongo, Kevin. "Palladium Doped Nano Porous Silicon to Enhance Hydrogen Sensing." Scholar Commons, 2006. http://scholarcommons.usf.edu/etd/3896.

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A mass manufacturable impedance based, palladium doped porous silicon sensor, was fabricated for hydrogen detection. The sensor was built using electrochemical etching to produce mesoporous silicon. Four nanometers of palladium was defused directly into the porous silicon and another four nanometers of Pd was deposited on the defused surface to enhance sensing. The sensor was tested in a sealed chamber in which the impedance was measured while hydrogen in nitrogen was ranged from 0-2 percent. Unlike conventional hydrogen sensors this sensor responded at room temperature to changes in hydrogen

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17

Brown, Andrew Richard. "Enhanced oxygen diffusion in silicon catalysed by atomic hydrogen." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46685.

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18

Terry, Jonathan Gordon. "Electrical characterisation of transition metals and hydrogen in silicon." Thesis, University of Manchester, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.680103.

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19

Le, Gulluche Anne-Charlotte. "Hybrid hydrogels as model nanocomposites : reinforcement mechanisms by analogy with filled rubbers." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1107/document.

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Les hydrogels sont des matériaux intrinsèquement mous, fragiles et élastiques, majoritairement composes d'eau. Leur capacité unique à interagir avec leur environnement se traduit par une grande variation de leur volume initial et en font l'objet d'applications variées dans de nombreux domaines tels que le secteur biomédical, l'industrie agro-alimentaire et cosmétique. Plus récemment, des hydrogels ont été développés pour des secteurs de pointe comme la robotique ou l'ingénierie tissulaire, permettant d'élargir le spectre d'utilisation de la matière molle en tant que matériau structurel. De ce

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20

Nagapatnam, Subbaraman Lakshman. "Lysozyme Deposition Studies on Silicone Hydrogel Contact Lens Materials." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/1245.

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Over 60 proteins have been detected in the tear film and among these lysozyme has attracted the greatest attention. Several techniques for elucidating the identity, quantity and conformation of lysozyme deposited on soft contact lenses have been developed. Lysozyme also deposits on the newly introduced silicone hydrogel (SH) lens materials, but in extremely low levels compared to conventional hydrogel lenses. Hence, a major analytical complication with the study of the SH contact lens materials relates to the minute quantity of deposited lysozyme. The first project of this thesis

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21

Szczotka-Flynn, Loretta B. "The Longitudinal Analysis of Silicone Hydrogel Contact Lens Study." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1257182345.

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22

Lorentz, Holly. "Lipid Deposition on Hydrogel Contact Lenses." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2963.

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The primary objective of this study was to quantify and characterise lipid deposition on soft (hydrogel) contact lenses, particularly those containing siloxane components. Studies involving a variety of <em>in vitro</em> doping and <em>in vivo</em> worn contact lenses were undertaken, in which lipid deposition was analyzed by either TLC or HPLC. Specific experiments were completed to optimize a method to extract the lipid from the lens materials, to compare the total lipid deposition on nine different hydrogel lenses and to analyze the effect that lipid deposition had on wettability. A m

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23

Bîlteanu, Liviu. "Atomic scale simulation of hydrogen related defects in hydrogen implanted silicon - Smart Cut™ technology." Paris 11, 2010. http://www.theses.fr/2010PA112293.

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Le sujet de cette thèse est lié à l'étape d'implantation de la technologie Smart Cut™. Cette technologie utilise l'hydrogène pour transférer des couches de silicium sur des substrats isolants. Le transfert se fait par une fracture induite par la formation des défauts bidimensionnels appelés dans la littérature des plaquettes (en anglais « platelets »). Plus précisément, nous avons étudié dans le cadre de cette thèse les défauts qui apparaissent dans l'état post implantation et leur évolution de l'endommagement d'implantation vers l'état qui contient des plaquettes. L'étude est organisée en deu

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24

Wilkinson, Andrew Richard, and arw109@rsphysse anu edu au. "The Optical Properties of Silicon Nanocrystals and the Role of Hydrogen Passivation." The Australian National University. Research School of Physical Sciences and Engineering, 2006. http://thesis.anu.edu.au./public/adt-ANU20060202.111537.

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This thesis examines the optical properties of nanoscale silicon and the sensitization of Er with Si. In this context, it predominantly investigates the role of defects in limiting the luminescence of Si nanocrystals, and the removal of these defects by hydrogen passivation. The kinetics of the defect passivation process, for both molecular and atomic hydrogen, are studied in detail. Moreover, the optical absorption of Si nanocrystals and the effect of annealing environment (during nanocrystal synthesis) on the luminescence are investigated. The effect of annealing temperature and hydrogen p

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25

Abdul-Niby, Mohammed. "Photoconductive frequency resolved spectroscopy for hydrogen and helium implanted silicon." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/804439/.

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26

Martsinovich, Natalia. "Theory of defects arising from hydrogen in silicon and diamond." Thesis, University of Sussex, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409286.

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27

Hourahine, Benjamin. "A first principles study of hydrogen related defects in silicon." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324743.

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28

Schafer, Jeffrey M. "A characterization of dryness symptoms with Silicone Hydrogel contact lenses." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1407508203.

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29

Sampson, Gareth Milo. "Hydrogen atom and argon ion reactions for removing hydrocarbon adsorbates and contamination from silicon surfaces /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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30

Pyke, Daniel James. "Hydrogen evolution and transport in semiconductors." Phd thesis, Canberra, ACT : The Australian National University, 2014. http://hdl.handle.net/1885/125142.

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Silicon-on-insulator structures are used for the fabrication of integrated electronic circuits, photonic devices and structures, and micro-electro-mechanical systems. The most common fabrication method for SOI is a hydrogen-induced cleavage technique in which ion-implanted hydrogen is employed to initiate and propagate cracks in a plane parallel to the silicon surface. Considerable research effort has been devoted to understanding this cleavage technique in (100) silicon but several fundamental issues remain unclear, including the role of stress on hydrogen platelet alignment. In addition, the

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31

Rai, Chaudhuri Anjana. "Electronic structure and bond energy trends in silicon-hydrogen and germanium-hydrogen bond activation by transition metals." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184731.

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The electronic structure factors that control Si-H and Ge-H bond activation by transition metals are investigated by means of photoelectron spectroscopy. Molecular orbital calculations are also used to gain additional insight into the orbital interactions involved in bond activation. The complexes studied have the general molecular formula (η⁵-C₅R'₅)Mn(CO)(L)HER₃, where R' is H or CH₃, L is CO or PMe₃, E is Si or Ge and R is Ph or Cl. These compounds are interesting models for catalysts in industrial processes like hydrosilation. The compounds display different stages of interaction and "activ

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32

Höchbauer, Tobias. "On the mechanisms of hydrogen implantation induced silicon surface layer cleavage." [S.l.] : [s.n.], 2001. http://archiv.ub.uni-marburg.de/diss/z2002/0403.

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33

Brown, Peter William. "Chemical vapor deposition of silicon carbide in the methyltrichlorosilane-hydrogen system /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487844485899111.

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34

Radi, Babak. "Reinforced hydrogels for silicone copolymer delivery for scar remediation." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/40984/1/Babak_Radi_Thesis.pdf.

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Hypertrophic scars are formed by collagen overproduction in wounded areas and often occur in victims of severe burns. There are several methods for hypertrophic scar remediation and silicone gel therapy is one of the more successful methods. Research by others has shown that the activity of these gels may be due to migration of amphiphilic silicone oligomers from the gel and into the dermis, down-regulating production of collagen by fibroblasts. Normal silicone oil (PDMS) does not produce the same effect on fibroblasts. The main purpose of this project is the introduction of a particular amphi

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35

Lewis, Kristen Oblad. "COMPARATIVE LIPIDOMICS OF HYDROGEL CONTACT LENSES IN-VITRO AND IN-VIVO." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243889772.

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36

Yelundur, Vijay Nag. "Understanding and Implementation of Hydrogen Passivation of Defects in String Ribbon Silicon for High-Efficiency, Manufacturable, Silicon Solar Cells." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5271.

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Photovoltaics offers a unique solution to energy and environmental problems simultaneously. However, widespread application of photovoltaics will not be realized until costs are reduced by about a factor of four without sacrificing performance. Silicon crystallization and wafering account for about 55% of the photovoltaic module manufacturing cost, but can be reduced significantly if a ribbon silicon material, such as String Ribbon Si, is used as an alternative to cast Si. However, the growth of String Ribbon leads to a high density of electrically active bulk defects that limit the minority c

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37

Yelundur, Vijay Nag /. "Understanding and Implementation of Hydrogen Passivation of Defects in String Ribbon Silicon for High-Efficiency, Manufacturable, Silicon Solar Cells." Available online, 2003. http://etd.gatech.edu/theses/available/etd-11192003-164008/.

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38

Fawcett, Timothy J. "Investigation into the hydrogen gas sensing mechanism of 3C-SiC resistive gas sensors." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001537.

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39

Ganeshalingam, Sashikesh. "Charge transfer of Rydberg hydrogen molecules and atoms at doped silicon surfaces." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:9f1f6bb6-47a0-47f6-ad55-52f416d08815.

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The work of this thesis focuses on the interaction of high Rydberg states of hydrogen molecules and atoms with various doped Si semiconductor surfaces with the results compared with those obtained with an atomically flat gold surface. The major part of the thesis was carried out using para-H₂ molecular Rydberg states with principal quantum number n = 17 - 21 and core rotational quantum number N⁺ = 2. Subsequently, this study was continued using H atomic Rydberg states with principal quantum number n = 29 - 34. The high Rydberg states have been produced using two-step laser excitation. For clos

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40

Huang, Ming-Chieh. "Silicon microfabricated device for non-sheath-flow cytometer-based chemical analysis and microchannel flow sensing /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/5870.

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41

Harp, Lisa. "Contributions of Silicone Hydrogel Transmissibility and Tear Exchange to Corneal Oxygen Supply." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275496222.

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42

Batinica, Gregory. "The photo-induced deposition of silicon and germanium on silicon (111) and the effects of germanium and phosphorus on the desorption of hydrogen from silicon (111) /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1998. http://wwwlib.umi.com/cr/ucsd/fullcit?p9913148.

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43

Ferreira-Resende, Antonio Luis Santos. "An ab initio study of deep-level defects in silicon." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312440.

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44

Lu, Chi. "Micro-Fabricated Hydrogen Sensors Operating at Elevated Temperatures." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/767.

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In this dissertation, three types of microfabricated solid-state sensors had been designed and developed on silicon wafers, aiming to detect hydrogen gas at elevated temperatures. Based on the material properties and sensing mechanisms, they were operated at 140°C, 500°C, and 300°C. The MOS-capacitor device working at 140°C utilized nickel instead of the widely-used expensive palladium, and the performance remained excellent. For very-high temperature sensing (500°C), the conductivity of the thermally oxidized TiO2 thin film based on the anodic aluminum oxide (AAO) substrate changed 25 times i

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45

Mbitta, Akoa Daline. "Silicon-delivering cellularized biomaterials for dental repair." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS133.

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Le silicium est présent en quantités faibles mais non négligeables dans les fluides biologiques et il a été démontré qu'il était bénéfique pour la formation des os. Parallèlement, de nombreux matériaux à base de silice sont utilisés dans la réparation osseuse. En revanche, bien que les matériaux à base de silice soient utilisés en dentisterie comme matériaux de coiffage pulpaire pour la réparation de la dentine, très peu d'études ont démontré jusqu'à présent que le silicium peut avoir un impact sur la formation de la dentine. Dans ce contexte, le présent projet vise à préparer des matériaux qu

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46

Rogers, Ronan. "In vitro and ex vivo wettability of hydrogel contact lenses." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2974.

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The wettability of contact lenses has become an area of intense research, with the belief that the more "hydrophilic" or wettable the lens surface is, the more comfortable the lens may be, as the posterior surface of the eyelid will move more smoothly over it, hence increasing comfort. <br /><br /> There are many ways to assess the wettability of a given material, namely sessile drop,<sup>1</sup> captive bubble <sup>2</sup> or Wilhelmy plate. <sup>3</sup> This thesis used the sessile drop method to determine the surface wettability of various hydrogel contact lens materials, by measurin

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47

Shi, Yupeng. "Functionalized Silica Nanostructures : Degradation Pathways and Biomedical Application from 2D to 3D." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS122/document.

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Les nanoparticules de silice sont très largement étudiées pour les applications biomédicales. Elles permettent une facilité et une flexibilité de la synthèse des particules et une bio-toxicité limitée. Cette thèse a mené une grande diversité de résultats impliquant des nanomatériaux de silice. Premièrement, les propriétés physicochimiques et les propriétés de biodégradation de trois types de nanoparticules de silice structurées ont été étudiées dans un tampon, un milieu de culture et au contact de fibroblastes cutanés humains suggérant que les nanoparticules de silice doivent être principaleme

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48

Kim, Hyoun-woo. "Wafer surface cleaning for silicon homoepitaxy with and without ECR hydrogen plasma exposure." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/28125.

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49

Yeh, Yi-hsing, and 葉怡杏. "Novel silicon hydrogel based on PDMS-polyurethane-HEMA for contact lens application." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/38194141679201755736.

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碩士<br>國立臺灣科技大學<br>高分子系<br>97<br>A novel hydrogel based on the block copolymer of polydimethylsiloxane-polyurethane (PDMS-PU) and 2-hydroxyethyl methacrylate (HEMA) was synthesized. This novel hydrogel was consisting of soft segment of poly(dimethylsiloxane) dialkanol with hydroxyethyl propoxy end groups and hard segment of isophorone diisocyanate (IPDI). Poly(ethylene glycol) methacrylate (PEGMA) was added as the chain-extender. Finally, by reacting silicone macromer (PDMS-PU) with HEMA under UV-photopolymerization, the copolymer was resulted (PDMS-PU-HEMA). The results showed that the wat

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50

GUO, GUAN-SIAN, and 郭冠賢. "Development of Functional Silicone Hydrogel." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/hqjxav.

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碩士<br>國立聯合大學<br>化學工程學系碩士班<br>106<br>In our study, a sol-gel process was used to synthesize the organic-inorganic hybrid prepolymers. The prepolymers were mixed with other formulas by photo-polymerization method to obtain the high oxygen permeability and functional silicone hydrogels for the applications of soft contact lens. In addition, the effect of prepolymer’s content on the properties of the silicone hydrogels was carried out by various analysis methods. The ratio of prepolymers affects the hydrophilicity/ hydrophobicity and degree of cross-linking of hydrogels, but also influence the swe

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