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Dissertations / Theses on the topic 'Hydrogen Nanocrystals'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

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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2

Bastola, Ebin. "The Catalytic Activity of Gold/Cadmium Sulfide (Au/CdS) Nanocrystals." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1403277153.

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3

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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4

Li, Guangqin. "Studies on Hydrogen-Storage Properties of Palladium Based Nanomaterials." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/193566.

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5

Huang, Zhenguo. "Effects of compositions and mechanical milling modes on hydrogen storage properties." Access electronically, 2007. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20080619.121505/index.html.

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6

Lian, Zichao. "Photo-Induced Carrier Transfer in Heterostructured Semiconductor Nanocrystals for Solar Energy Conversion." Kyoto University, 2018. http://hdl.handle.net/2433/235053.

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7

Batalha, Nuno Miguel Rocha. "Optimization of the balance between activity and selectivity on a hydroisomerization catalyst." Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT2268/document.

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Un des principaux défis lors de l'élaboration des catalyseurs adéquats pour le procédé de déparaffinage catalytique (hydroisomérisation) est de maximiser le rendement en isomères et l'activité du catalyseur, tout en maintenant une faible sélectivité en produits de craquage. En effet, des catalyseurs avec sélectivité de forme à base de zéolithes à taille de pore intermédiaire, par exemple Pt/ZSM-22, sont sélectives en isomères, tandis que les zéolithes à large pore sont plus actifs, mais moins sélectif. L'objectif principal de cette thèse était, alors, d’étudier et de développer un catalyseur à

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8

Wang, Xiaojie [Verfasser]. "Functional Nanocomposite Hydrogels Based on Cellulose Nanocrystals / Xiaojie Wang." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://d-nb.info/1226425658/34.

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9

Gicquel, Erwan. "Development of stimuli-responsive cellulose nanocrystals hydrogels for smart applications." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI105/document.

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L’originalité de ce projet consiste au développement et à l’étude de nouvelles structures hybrides à base de nanocelluloses et de polymères stimulables. En particulier, c’est le design d’hydrogels aux propriétés thermosensibles qui est visé. Les nanocelluloses - nanoparticules issues de la cellulose - sont de deux types : les nanocristaux de cellulose (CNCs) et les nanofibrilles de cellulose (CNFs) et possèdent des propriétés bien particulières. Cette étude s’est concentrée sur l’élaboration d’hydrogels de CNCs. Plusieurs polymères thermosensibles ont été utilisés pour leur biocompatibilité et

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10

Lin, Ning. "Cellulose nanocrystals : surface modification and advanced materials." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI034/document.

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Ce travail porte sur les propriétés des nanocristaux de cellulose, leur modification de surface et le développement de matériaux avancés. Diverses approches sont utilisées sur ces substrats nanométriques visant à modifier leurs propriétés de surface et étendre leur utilisation dans des applications très sophistiquées, telles que la postsulfation et la désulfatation, le greffage et l'adsorption de polymères, l’oxydation sélective, le greffage moléculaire et l'inclusion "hôte-invité". Sur la base de modifications de surface, l'analyse des propriétés (pour différents taux de groupements sulfates)

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11

Way, Amanda E. "Stimuli-Responsive Nanofiber Composite Materials: From Functionalized Cellulose Nanocrystals to Guanosine Hydrogels." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1390388160.

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12

Rehovsky, Chad Austin. "Bioprinting of Pancreatic Cancer Cells for Improved Drug Testing." Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/31696.

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Currently, many drugs are preclinically tested on two-dimensional cell cultures. However, this method does not adequately replicate the cellular interactions or diffusion gradient that occur in three-dimensional tissues, leading to poor indicators of how a drug may affect human tissues. The objective of this project was to use bioprinted pancreatic cancer cell cultures as a platform for three-dimensional drug testing. Various bioink formulations of cellulose, gelatin, and alginate were evaluated to determine which provided the best printability and cell viability. A cellulose nanocrystal and a

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13

Schaack, Sofiane. "Nuclear quantum effects in hydrated nanocrystals." Electronic Thesis or Diss., Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2019SORUS370.pdf.

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La nature quantique des noyaux produit des comportements inattendus et souvent paradoxaux. Du fait de sa légèreté, l'hydrogène est le candidat le plus susceptible de présenter de tels comportements. Nous avons étudié trois systèmes hydratés dont les mécanismes sont déterminés par les propriétés quantiques des protons (NQEs) : la Brucite (Mg(OH)2), l'hydrate de méthane (CH4-H2O) et l'hydroxyde de sodium (NaOH). Au sein des Brucites coexistent deux effets en compétition : un mécanisme de réorientation thermiquement activé, et un processus de dissociation déclenché par les NQEs. Ces deux effets s

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14

Huang, Heqin [Verfasser], Kai Jr [Akademischer Betreuer] Zhang, Kai Jr [Gutachter] Zhang, and Philipp [Gutachter] Vana. "Dynamic Heterogeneous Hydrogels with Cellulose Nanocrystals / Heqin Huang ; Gutachter: Kai Jr.- Zhang, Philipp Vana ; Betreuer: Kai Jr.- Zhang." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/1183374585/34.

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15

Pham, Minh-Hao. "Nacoscale Metal-organic Frameworks : Synthesis and Application of Bimodal Micro/Meso-structure and Nanocrystals with Controlled Size and Shape." Doctoral thesis, Université Laval, 2013. http://hdl.handle.net/20.500.11794/24247.

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Les composés à réseau moléculaire organo-métalliques (MOFs) ont émergé comme de nouvelles classes de matériaux hybrides organo-inorganiques avec des potentialités significatives en séparation, stockage de gaz, catalyse et support de médicaments. Ces matériaux sont formés par un processus d’assemblage dans lequel les ions métalliques sont liés entre eux via un ligand organique, ce qui génère une surface de l’ordre de 6500 m2g−1 et des volumes de pores supérieurs à 4.3 cm3g−1. Dans cette thèse trois différentes approches ont été développées pour la synthèse des nanocristaux MOFs à deux modes mic

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16

Wang, Chiung-I., and 王瓊誼. "Facet-Dependent Photoreactivity of Plasmonic Silver Nanocrystals for Hydrogen Evolution Reaction." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/67960443243097874644.

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碩士<br>國立臺灣師範大學<br>化學系<br>104<br>The facet-dependent photoelectrocatalytic activities of silver nanocrystals on carbon fiber paper (CFP) were investigated for hydrogen evolution reaction (HER) under the laser irradiation at wavelengths of 450, 532 and 808 nm, respectively. Under the laser irradiation at wavelength of 450 nm, the hydrogen generation of silver cuboctahedra was improved due to localized surface plasmon resonance (LSPR), that the current density was shift from -20.23 to -20.50 mA/cm2 and the photocurrent density was reached to 0.27 mA/cm2. Furthermore, photocurrent density of silve

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17

Chen, Ting-Ruei, and 陳廷睿. "NIR Photoelectrochemical hydrogen generation using Pyrite FeS2 Nanocrystals sensitized TiO2 photoelectrodes." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/55159294216499362800.

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碩士<br>國立臺灣師範大學<br>化學系<br>101<br>In this study, we demonstrated the sensitizer of near infrared (NIR) based on solution processable pyrite FeS2 NCs spun onto porous TiO2 films (FeS2/TiO2/FTO film) for Photoelectrochemical (PEC) hydrogen generation. Experimentally, for fabricating a FeS2/TiO2/FTO film, a TiO2/FTO substrate was first prepared by sol-gel method. Then, FeS2 NCs were spun onto TiO2/FTO substrate to form FeS2/TiO2/FTO heterojunction photoanode. PEC cell of FeS2/TiO2/FTO film were placed in the electrolyte of 0.25M Na2S and 0.35M Na2SO3 and illuminated under NIR laser (808nm, I0=3

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18

Sinatra, Lutfan. "Nanocrystals and Nanoclusters as Cocatalysts for Photocatalytic Water Splitting." Diss., 2016. http://hdl.handle.net/10754/621989.

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The energy consumptions worldwide have increased simultaneously with the growth of the population and of the economy. Nowadays, finding an alternative way to satisfy the energy demand is one of the great challenges for the future of humanity, especially due to the limitation of fossil fuels and their effect on global warming. Hydrogen, as an alternative fuel for the future, is very attractive. Compared to traditional methods, such as the steam reforming of natural gas or coal gasification, photocatalytic water splitting (PWS) is considered to be the most sustainable alternative for producing h

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19

Liu, Yen-Hui, and 劉彥輝. "Nano-optoelectronic materials: 1. Ionic liquid-assisted synthesis and the photocatalytic applications of TiO2 nanocrystals/nanocomposites, 2. Effects of hydrogen bonding on photoluminescence efficiencies of conjugated polymers." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/b955s8.

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20

Chiu, Chun-Ya, and 邱淳雅. "Synthesis of Au–Pd Core–Shell Nanocrystals with Tunable Shapes and Sizes for Examination of Their Optical and Hydrogen Sensing Properties, and Their Self-Assembly into Supercrystals." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/09972879309032339156.

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博士<br>國立清華大學<br>化學系<br>102<br>Core−shell nanoparticles are highly functional materials with modified properties by changing either the constituting materials or the core to shell ratio. Various core−shell nanostructures have been synthesized such as Au−Cu2O, Au−Ag, Au−Cu, Pt−Pd, and Au−Pd core−shell nanoparticles. Among them, Au−Pd core−shell nanostructures have efficient catalytic properties for a variety of reactions and plasmonic gas sensing upon exposure to H2 as reversible H2 uptake from the Pd shell occurs. Furthermore, synthesis of well-defined Au−Pd core−shell nanocrystals with systema

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21

Huang, Heqin. "Dynamic Heterogeneous Hydrogels with Cellulose Nanocrystals." Thesis, 2019. http://hdl.handle.net/11858/00-1735-0000-002E-E5FB-9.

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22

Wang, Xiaojie. "Functional Nanocomposite Hydrogels Based on Cellulose Nanocrystals." Thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-14D9-0.

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23

Wu, Bao-Hsien, and 吳泊賢. "Fabrication, Plasmonic Properties and Plasmon-Enhanced Photocatalytic Hydrogen Production of Au/TiO2 Hybrid Nanocrystal Arrays." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2rwugc.

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博士<br>國立清華大學<br>材料科學工程學系<br>106<br>In recent years, hybrid nanostructures consisted of plasmonic metals and different dielectric materials have attracted much attention for their intriguing plasmonic properties. Recent studies have also shown that by introducing plasmonic metals, the photocatalytic efficiency of semiconductor can improve via plasmon-enhanced light absorption and plasmonic sensitization. In this thesis, excellent photocatalytic properties for hydrogen production have been demonstrated by utilizing the hexagonal close-packed Au/TiO2 hybrid nanocrystal arrays. By combining colloi

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24

Chakrabarty, Arkajyoti. "Bile Acid Based Supramolecular Gels, Semiconductor Nanocrystals And Soft Hybrid Materials." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2513.

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Chapter 1. General Introduction This chapter gives an introduction to supramolecular organo/hydrogels and the related bile acid chemistry touching upon the gelation properties of the bile acid derivatives. Diverse applications of the supramolecular gels are illustrated with several examples. In the concluding section of this chapter, a brief introduction on the semiconductor nanocrystals is provided. Finally, the content of the thesis is outlined. Chapter 2. Bile Acid Derived Novel Organo/hydrogelators Part 1. Bile Acid Derived Organo/hydrogelators With a Basic Side Chain Cationic analog

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25

Lee, Yao-Wen, and 李耀文. "Metal-Nucleotide Hydrogel Entrapment and Cellulose Nanocrystal on Magnetic Alginate Microbeads for Enzyme Affinity Immobilization." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3cd887.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>106<br>In recent years, the amount of global diabetic patients increases. Diabetes can cause significant harm to human body, therefore it is very important to monitor blood sugar in diabetic patient. HbA1c is a product of glucose attached to the amino group of the N-terminal of hemoglobin β chain, which reflects long-term glycemic status of diabetic patients. In this study, fructosyl valine (FV), a simulated fragment of HbA1c will be oxidized by fructosyl peptide oxidase (FPO), that produces hydrogen peroxide (H2O2), and furthermore, color change will be developed wh

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26

Huang, Wei-Hsiang, and 黃韋翔. "Colloidal Synthesis of GeSbTe Nanocrystal and Its Phase Change Characteristics & Hydrogen Production by Kerf Loss Corrosion Assisted by Sodium metasilicate and Silicic acid." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/884m4t.

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