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Gold Nanocomposites: Synthesis and Applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Gold Nanocomposites: Synthesis and Applications./
作者:	Ni, Siting.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	198 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-10, Section: B.
Contained By:	Dissertations Abstracts International83-10B.
標題:	Cancer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29043546
ISBN:	9798209934943

Gold Nanocomposites: Synthesis and Applications.
Ni, Siting.

Gold Nanocomposites: Synthesis and Applications. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 198 p.

Source: Dissertations Abstracts International, Volume: 83-10, Section: B.

Thesis (Ph.D.)--McGill University (Canada), 2021.

This item must not be sold to any third party vendors.

Gold nanomaterials have applications in areas ranging from photothermal therapy to catalysis. However, access to such applications often requires surface modification of these nanomaterials or linking strategies to other materials. In this context, this Thesis reports the development of modification strategies and resulting applications of gold nanorods (AuNR) and gold nanoparticles (AuNP).The inverse-electron-demand Diels-Alder (IEDDA) reaction has been adapted to covalently bind AuNR to single wall carbon nanotubes (SWCNT). This thermally mild preparation method allows for the potential introduction of thermally labile species to Au-CNT conjugates. IEDDA provides controllable, clean, and facile access to polymer-free organic-soluble AuNR-SWCNT conjugates. Further, AuNRs modified with thiol-terminated oligoethylene glycols exhibit excellent solubility and thermal stability in hydrophobic and hydrophilic environments. This surface modification methodology is applicable to AuNRs with a range of length-to-width aspect ratios. Spherical AuNP that can infiltrate the pores of mesoporous 500nm silica particles has been prepared to yield a novel catalyst, Au/SiO2. This nanocomposite material has a well-defined structure and excellent stability. It is shown to demonstrate catalytic conversion of CO2 to produce valuable organic products, and good recyclability. CO2 is thus reported here to be transformed, under hydrogenation conditions, to the C4 compound 1,4-dioxane with high selectivity (92%). Reaction intermediates were studied both experimentally and computationally using density functional theory (DFT) modeling. While CO2 reduction to simple molecules has attracted considerable attention, the direct conversion of CO2 to complex molecules has been less frequently reported. The Au/SiO2 composite can be used in direct air capture (DAC)-incorporated tandem conversions. In the presence of a Lewis acid (boric acid), the Au/SiO2 catalyst enables an efficient conversion of amine-associated CO2 in water to form methanol, formate, and formamide with an 80% overall yield. A mechanistic study involving isotopic labelling suggests that methanol production in the catalytic process arises from the direct hydrogenation of formate. Importantly, this one-pot, two-step process is able to convert CO2 in air at ambient pressures to yield C1 products in the absence of an organic solvent.

ISBN: 9798209934943Subjects--Topical Terms:

634186
Cancer.

Gold Nanocomposites: Synthesis and Applications.
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500 $a Source: Dissertations Abstracts International, Volume: 83-10, Section: B.
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502 $a Thesis (Ph.D.)--McGill University (Canada), 2021.
506 $a This item must not be sold to any third party vendors.
520 $a Gold nanomaterials have applications in areas ranging from photothermal therapy to catalysis. However, access to such applications often requires surface modification of these nanomaterials or linking strategies to other materials. In this context, this Thesis reports the development of modification strategies and resulting applications of gold nanorods (AuNR) and gold nanoparticles (AuNP).The inverse-electron-demand Diels-Alder (IEDDA) reaction has been adapted to covalently bind AuNR to single wall carbon nanotubes (SWCNT). This thermally mild preparation method allows for the potential introduction of thermally labile species to Au-CNT conjugates. IEDDA provides controllable, clean, and facile access to polymer-free organic-soluble AuNR-SWCNT conjugates. Further, AuNRs modified with thiol-terminated oligoethylene glycols exhibit excellent solubility and thermal stability in hydrophobic and hydrophilic environments. This surface modification methodology is applicable to AuNRs with a range of length-to-width aspect ratios. Spherical AuNP that can infiltrate the pores of mesoporous 500nm silica particles has been prepared to yield a novel catalyst, Au/SiO2. This nanocomposite material has a well-defined structure and excellent stability. It is shown to demonstrate catalytic conversion of CO2 to produce valuable organic products, and good recyclability. CO2 is thus reported here to be transformed, under hydrogenation conditions, to the C4 compound 1,4-dioxane with high selectivity (92%). Reaction intermediates were studied both experimentally and computationally using density functional theory (DFT) modeling. While CO2 reduction to simple molecules has attracted considerable attention, the direct conversion of CO2 to complex molecules has been less frequently reported. The Au/SiO2 composite can be used in direct air capture (DAC)-incorporated tandem conversions. In the presence of a Lewis acid (boric acid), the Au/SiO2 catalyst enables an efficient conversion of amine-associated CO2 in water to form methanol, formate, and formamide with an 80% overall yield. A mechanistic study involving isotopic labelling suggests that methanol production in the catalytic process arises from the direct hydrogenation of formate. Importantly, this one-pot, two-step process is able to convert CO2 in air at ambient pressures to yield C1 products in the absence of an organic solvent.
520 $a Les nanomateriaux en or ont beaucoup d'applications dans les domaines allant de la therapie photothermique a la catalyse. Cependant, l'acces a de telles applications necessite souvent des modifications en surface des nanomateriaux ou des strategies de liaison a d'autres materiaux. Dans ce contexte, cette These rend compte du developpement des modifications et des applications des nanotiges d'or (AuNRs) et des nanoparticules d'or (AuNPs).La reaction de Diels-Alder a demande inverse (IEDDA en anglais) a ete adaptee pour lier de maniere covalente des AuNRs a des nanotubes de carbone monofeuillets (SWCNTs en anglais). Cette methode de preparation thermiquement douce permet l'introduction potentielle d'especes thermiquement labiles aux materiaux conjugues Au-CNT. La IEDDA fournit un acces controlable, propre et facile aux materiaux conjugues AuNR-SWCNT solubles dans les matieres organiques sans polymere. En outre, les AuNRs qui sont modifies par des oligoethyleneglycols avec des terminaisons des thiols presentent une excellente solubilite et stabilite thermique dans des environnements hydrophobes et hydrophiles. Cette methodologie de modification de surface est applicable aux AuNRs avec divers rapports de hauteur / largeur.Des AuNPs qui infiltrent les pores de particules mesoporeuses de silice de 500 nm ont ete prepares pour concevoir un nouveau catalyseur Au/SiO2. Ce nanomateriau composite a une structure bien definie et une excellente stabilite. Il a une bonne recyclabilite et il catalyse la conversion du CO2 pour produire des produits organiques precieux. Dans des conditions d'hydrogenation, le CO2 est transforme en un compose C4 --- 1,4-dioxane, avec une selectivite elevee (92%). Les intermediaires de la reaction ont ete etudies a la fois experimentalement et par ordinateur en utilisant la theorie de la fonctionnelle de la densite (DFT). Alors que la reduction du CO2 en des molecules simples a attire une attention considerable, la conversion directe du CO2 en des molecules complexes a ete moins frequemment rapportee. En outre, le materiau composite Au/SiO2 peut etre utilise dans les conversions en tandem incorporees a capture directe d'air (DAC). En presence d'un acide de Lewis, l'acide borique, le Au/SiO2 permet une conversion efficace du CO2 dans l'eau avec des amines pour former du methanol, du formiate et du formamide avec un rendement global de 80%. Une etude mecanistique impliquant le marquage isotopique suggere que la production de methanol resulte de l'hydrogenation directe du formiate. Il est important de noter que ce procede a un pot et a deux etapes est capable de convertir le CO2 dans l'air a des pressions ambiantes pour donner des produits C1 en l'absence de solvant organique.
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