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Dissertations / Theses on the topic 'Laser ablation in liquid medium'

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1

Mansour, Yehia. "Études théorique et expérimentale de la formation des nanoparticules métalliques par ablation laser en milieu liquide. Modélisations des propriétés optiques et thermiques de l'interaction Laser-Nanoparticules." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0283.

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Les nanoparticules (NPs) de métaux nobles sont le siège d’un phénomène de résonance plasmon de surface résultant de l’oscillation collective de leurs électrons de conduction sous l’effet d’une onde électromagnétique. Dans le cas de NPs d’or et l’argent, la fréquence de résonance est située dans visible ce qui confère à ces NPs plasmoniques des propriétés optiques uniques. En particulier, la position et l’intensité de la bande de résonance plasmon peuvent varier en fonction de leur taille, leur forme (rapport d'aspect) et de l'indice du milieu hôte. Les possibilités d’applications nécessitent d
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2

Liu, P., G. W. Yang, H. B. Li, and Y. Liang. "Laser ablation in liquid: from nanocrystals synthesis to nanostructures fabrication." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20594.

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3

Messina, Elena. "Metal nanoparticles produced by Pulsed Laser Ablation in Liquid Environment." Thesis, Universita' degli Studi di Catania, 2011. http://hdl.handle.net/10761/109.

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Particles in the nanometer size range have attracted increasing attention with the growing interest in nanoscience and nanotechnology. They hold potential as basic components for sub-wavelength optical devices, for surface-enhanced spectroscopy, for biological labelling and sensing, and for cancer therapy. For such applications, it is crucial to prepare metal nanoparticles with desired shape, and size distribution. In this context, Pulsed Laser Ablation in Liquids (PLAL) has become a key method for synthesis of nanoparticles with controlled geometry and size.
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4

Popovic, D. M., A. A. Zekic, M. Trtica, and J. Stasic. "Picosecond Laser Ablation of Silicon Single Crystal in a Liquid Environment." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34927.

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The picosecond Nd:YAG laser at wavelengths of 1064 nm was used to produced the silicon-based nanoparticles in de-ionized water. The main goal of our work presented here was enlight the role of thermal effects on the process of laser ablation of solid target in liquid. To accieve this goal the additional heating of the target surface by continuous laser was applied during the experiment. The shift of nanoparticles size distribution caused by applying of additional continuous laser was reported in this work. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/
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5

Yang, Li. "Self-assembly and ordering nanomaterials by liquid-phase pulsed laser ablation." Thesis, University of Bristol, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445829.

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6

Lam, Julien. "Pulsed Laser Ablation in Liquid : towards the comprehension of the growth processes." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10137/document.

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Lorsqu'une impulsion laser est focalisée sur une cible solide immergée dans un liquide, de la matière est vaporisée. La nucléation et la croissance ont lieu dans le liquide et des nanoparticules sont ainsi synthétisées. La méthode est très polyvalente puisqu'une grande variété de matériaux peut être générée. De plus, les nanoparticules sont directement stabilisées dans le solvant. L'ajout d'agent complexant n'est pas nécessaire mais peut tout de même permettre de mieux contrôler la taille des nanoparticules. Cependant, de nombreux processus sont mis en jeu durant la synthèse et l'objectif de c
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7

Messina, Gabriele Carmine. "In Liquid Laser Processes for Metal Nanoparticles Synthesis and Manipulation." Doctoral thesis, Università di Catania, 2013. http://hdl.handle.net/10761/1291.

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The exponential spread of high level technology in the last decade has been followed by an increasing request for new materials able to fulfill all required characteristics for the construction of smaller devices. In this view, nanostructures and in particular metal nanoparticles are gaining attention since their unique optical, electrical and antibacterial properties. Pulsed Laser Ablation in Liquid represents a consolidated route for the synthesis of pure surface metal nanoclusters but, till now, the low production yield of this technique has stopped every attempt in this direction. For thes
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8

Khan, Sohaib Zia. "Generation and Characterisation of Metal-Oxide Nanoparticles by Continuous-wave Laser Ablation in Liquid." Thesis, University of Manchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517819.

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9

Camarda, Pietro. "Growth and photoluminescence dynamics of zno nanoparticles produced by pulsed laser ablation in liquid." Doctoral thesis, Università di Catania, 2017. http://hdl.handle.net/10761/3675.

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Zinc oxide (ZnO) is a wide band-gap semiconductor material (Eg=3.37 eV) characterized by many promising properties which make it appealing for several technological applications. One of the most attractive features is its high exciton binding energy (60 meV) which allows the observation of the UV excitonic emission at room temperature and favors the excitation of defect-related emission bands in the visible spectral region. In recent years, there has been an increasing interest in ZnO nanostructures due to their variety of morphologies and availability of simple and low cost processing methods
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10

Diouf, Mouhamed. "Synthèse de nanoparticules par ablation laser en liquide et étude de leurs propriétés optiques." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00850690.

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De nombreux domaines, tels que le biomédical, la micro-fluidique ou l'optique quantique, sont demandeurs de nanoparticules présentant des propriétés optiques spécifiques. L'ablation laser en liquide, PLAL (Pulsed Laser Ablation induced in Liquid) est une méthode de synthèse permettant d'élaborer rapidement des nanoparticules dans une large gamme de matériaux, et donc de tester la conservation ou la modification des propriétés optiques originales identifiées dans certains matériaux lorsque l'on passe aux tailles nanométriques (scintillation, thermoluminescence, photo-stimulation, haut rendement
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11

Alameer, Maryam. "Polarization Dependent Ablation of Diamond with Gaussian and Orbital Angular Momentum Laser Beams." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39850.

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The vectorial nature (polarization) of light plays a significant role in light-matter interaction that leads to a variety of optical devices. The polarization property of light has been exploited in imaging, metrology, data storage, optical communication and also extended to biological studies. Most of the past studies fully explored and dealt with the conventional polarization state of light that has spatially symmetric electrical field geometry such as linear and circular polarization. Recently, researchers have been attracted to light whose electric field vector varies in space, the s
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12

Okabayashi, Satoki. "Development of laser micro-sampling and electrothermal vaporization techniques for ICP-mass spectrometry and its cosmochemical implications on opaque assemblages in chondrites." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188497.

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13

Kosalathip, Voravit. "Synthèse et caractérisation microstructurale de poudres nanométriques à base de Bi2Te3 et Sb2Te3 : contribution à l'état de l'art des nanocomposites thermoélectriques." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL033N/document.

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L’étude de matériaux thermoélectriques nanocomposites et nanostructurés est en plein essor suite à l’intérêt de multiplier le nombre d’interfaces et de diminuer la taille des objets pour améliorer les performances. Nous avons mis au point une nouvelle méthode de préparation de nanopoudres thermoélectriques de type n (Bi0.95Sb0.05)2(Te0.95Se0.05)3 et de type p (Bi0.2Sb0.8)2Te3, à partir de la fracturation laser en milieu aqueux de poudres de taille micrométrique. La cellule de préparation développée permet d’obtenir par jour environ 200 mg de poudres nanométriques cristallisés présentant la str
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14

Resano-Garcia, Amandine. "Élaboration par ablation laser en milieu liquide de nanoparticules métalliques : caractérisation et modélisation des réponses plasmoniques des nanoparticules d’or et d’argent." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0320/document.

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Les nanoparticules métalliques (NPs) présentent des propriétés optiques (PO) uniques provenant de l’oscillation collective de leurs électrons. Cet effet se traduit par l'émergence d'une bande plasmon dont les caractéristiques peuvent être modulées par la taille, la forme, la nature des NPs et le milieu hôte. Il existe de nombreuses méthodes pour la préparation de ces NPs, l'une d'entre elles est l'ablation laser en milieu liquide (ALML). Cette technique offre certains avantages comme la simplicité, l’adaptabilité et des NPs dépourvues de contamination. Ses principaux inconvénients sont la prod
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15

Pokhrel, Chandra Prasad. "Crystal growth and charge carrier transport in liquid crystals and other novel organic semiconductors." [Kent, Ohio] : Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1254234736.

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Thesis (Ph.D.)--Kent State University, 2009.<br>Title from PDF t.p. (viewed April 1, 2010). Advisor: Brett Ellman. Keywords: Laser; Charge generation; Charge transport; Mobility; Trapping; Space charge; Hopping; Tunneling; Lattice vibration; Exciton; Polaron; HUMO; LUMO; Action Spectrum; Quantum efficiency; Crystal Growth; Liquid crystal; Disordered medium. Includes bibliographical references.
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16

Naresh, Shakya Man. "Studies of Electronic Transport in Novel Smectic and Discotic Liquid Crystalline Organic Semiconductors." Kent State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=kent1289418142.

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17

Malviya, Kirtiman Deo. "Synthesis And Study Of Microstructure Evolution In Nanoparticles Of Immiscible Alloys By Laser Ablation Under Liquid Medium." Thesis, 2013. https://etd.iisc.ac.in/handle/2005/2614.

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The present thesis deals with synthesis of free alloy nanoparticles in immiscible alloy systems by the process of laser ablation under a liquid. In this process the alloy target is submerged in a liquid and the plume formed by the laser beam interaction with the target is confined in the liquid. The nanoparticles formed inside this plume and get quenched by the surrounding liquid yielding suspension of nanoparticles in the liquid. By the addition of suitable surfactants, these nanoparticles can be protected from other reactions and their size can be controlled by preventing further growth. W
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18

Malviya, Kirtiman Deo. "Synthesis And Study Of Microstructure Evolution In Nanoparticles Of Immiscible Alloys By Laser Ablation Under Liquid Medium." Thesis, 2013. http://etd.iisc.ernet.in/handle/2005/2614.

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The present thesis deals with synthesis of free alloy nanoparticles in immiscible alloy systems by the process of laser ablation under a liquid. In this process the alloy target is submerged in a liquid and the plume formed by the laser beam interaction with the target is confined in the liquid. The nanoparticles formed inside this plume and get quenched by the surrounding liquid yielding suspension of nanoparticles in the liquid. By the addition of suitable surfactants, these nanoparticles can be protected from other reactions and their size can be controlled by preventing further growth. We
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19

Jo, Young Kyong. "Generation of Core/shell Nanoparticles with Laser Ablation." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11660.

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Two types of core/shell nanoparticles (CS-NPs) generation based on laser ablation are developed in this study, namely, double pulse laser ablation and laser ablation in colloidal solutions. In addition to the study of the generation mechanism of CS-NPs in each scheme, the optical properties of designed CS-NPs are determined with UV-VIS-NIR spectroscopy and EM field simulation. In the first scheme, which is double pulse laser ablation, two laser beams are fired in a sequence on two adjacent targets with different material. We have successfully demonstrated the generation of Sn/Glass, Zn/Glass,
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20

Franjic, Kresimir. "Studies of Laser Ablation of Liquid Water Under Conditions of Impulsive Heat Deposition Through Vibrational Excitations (IHDVE)." Thesis, 2010. http://hdl.handle.net/1807/24751.

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A new laser ablation mechanism of liquid water based on recent insights into its hydrogen bond dynamics has been studied and several applications of the ablation demonstrated. The mechanism, termed as Impulsive Heat Deposition through Vibrational Excitations (IHDVE), is based on the ability of the hydrogen bond network of water to rapidly thermalize vibrational O-H stretch excitations on a time scale of several picoseconds even for excitation intensities that are large enough to bring excited volumes far into the supercritical region. In this way, by using vibrationally resonant picosecond inf
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21

KumarSubramani, Udaya, and 蘇舶尼. "Fabrication of polymer surface microstructure using liquid-assisted CO2 Laser Ablation for the enhancement of Triboelectric effect." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/61088397826750520460.

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碩士<br>國立成功大學<br>機械工程學系<br>104<br>Global energy usage and production are inefficient. Triboelectric nanogenerator (TENG) is a promising technique to efficiently reuse the energy. Herein, we discuss cost efficient and feasible fabrication process for the enhancement of triboelectric effect in materials. The CO2 laser of 10.16 µm wavelength is one of the cost-effective, rapid and reliable polymer material processing methods. This photo-thermal process for material subtraction causes some defects like debris, cracks, and bulges near the laser-ablated area. We propose a novel concept in advanced la
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22

Do, Trong Mui, and 杜重未. "Laser ablation inductively coupled plasma mass spectrometry and its application in analysis of liquid and airborne particulate matter sample." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/30166115106673849129.

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23

Lin, Bo-Cheng, and 林柏丞. "Composite condensates and phase transformations via pulsed laser ablation on Zn, Zn-Cu and Cu-Au targets in liquid or vacuum." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/35771730259636901924.

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博士<br>國立中山大學<br>材料與光電科學學系研究所<br>100<br>This research deals with the synthesis and characterization (transmission electron microscopy and optical spectroscopy) of composite nanocondensates produced by pulse laser ablation (PLA) on Zn, Zn-Cu and Cu-Au targets in liquid or vacuum. First, wurtzite-type (W)-ZnO and
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