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Xerogel-Sequestered Transition Metal Catalysts for the Oxidation of Aqueous Halides with Hydrogen Peroxide: Toward a New Generation of Marine Antifouling Materials
Başlık:
Xerogel-Sequestered Transition Metal Catalysts for the Oxidation of Aqueous Halides with Hydrogen Peroxide: Toward a New Generation of Marine Antifouling Materials
Yazar:
Damon, Corey A., author.
ISBN:
9780438050068
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (140 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Michael R. Detty Committee members: G. Ekin Atilla-Gokcumen; Javid Rzayev; David Watson.
Özet:
Marine biofouling is the accumulation of biological organisms on any submerged surface. Biofouling on ship hulls leads to added roughness and drag, increased fuel consumption, and higher levels of greenhouse gas emissions in order to meet range and speed demands. In addition, biofouling may lead to the introduction of invasive species, a major concern in New York's Great Lakes. Antifouling hull coatings that discourage settlement and fouling-release coatings that minimize adhesion of fouling organisms are two approaches to combat biofouling.
Sol-gel-derived xerogel coatings incorporating organically modified silanes have shown promise as fouling-release coatings and have previously been modified to incorporate organochalcogenide catalysts for the oxidation of bromide with hydrogen peroxide. The catalytic oxidation of oceanic halides with H 2O2 found in aquatic environments can produce hypohalous acids in situ, which discourage the settlement of aquatic species. Grafting of transition metals to mesoporous silica has also generated catalysts for the oxidation of halide salts with H2O2, albeit only under acidic conditions.
Active xerogels incorporating transition metals have been prepared to catalyze the oxidation of both bromide and chloride with H2O 2 at the pH of seawater---the first evidence of chloride oxidation under oceanic conditions. Biological assays performed with the green alga Ulva linza yielded a significant reduction in zoospore settlement and increase in sporeling removal in the presence of H2O 2, indicating antifouling properties have been introduced to a fouling-release surface. Select ORMOSILs have been introduced to coatings to increase hydrophobicity, resulting in reduced drag and faster sail times in Lake Ontario. The impact of transition metals and ORMOSILs on xerogel surface characteristics has been evaluated by contact angle analysis, scanning electron microscopy (SEM), and inductively coupled plasma mass spectrometry, and the upgraded coatings have been tested against bacteria and macrofoulers worldwide.
Notlar:
School code: 0656
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(682050.1) | 682050-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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