Rozprawy doktorskie na temat „Laser ablation in liquid medium”
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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.
Pełny tekst źródłaNoble metal nanoparticles (NPs) are the site of a surface plasmon resonance phenomenon resulting from the collective oscillation of their conduction electrons under the effect of an electromagnetic wave. In the case of gold and silver NPs, the resonant frequency is in the visible range, which gives these plasmonic NPs unique optical properties. In particular, the position and intensity of the plasmon resonance depend on their size, shape (aspect ratio) and the index of the host medium. The possible applications require pure samples and mono-dispersed distribution. The chemical synthesis of NPs allows the shape and size of NPs to be controlled. However, it requires the use of stabilizing agents, which lead to surface contamination by synthetic residues. To limit this disadvantage, the physical technique of laser ablation in a liquid medium is a promising alternative, which, however, suffers from a lack of control over the shape and size of the NPs produced. The shape and size of NPs produced by liquid laser ablation (ALML) are closely related to the three essential steps of the process: Target / laser interaction; Mass transport; Laser / NPs interaction suspended in the liquid. In order to understand the mechanisms governing each of these stages, it is necessary to study them separately. In this work, we focused on the mechanisms of interaction between the laser beam and the NPs suspended in the liquid. Depending on the energy density absorbed by the suspended NPs, they undergo fragmentation or remodeling. We then studied the mechanisms behind the phenomenon of fragmentation. The evolution of the shape distribution of NPs during NP fragmentation was studied by developing an original and quantitative technique of in-situ optical spectroscopy. And, the evolution of the volume fraction of NPs during their preparation by ALML by in-situ optical spectroscopy is obtained and analyzed. In parallel with the experimental work, we have developed theoretical models for understanding the mechanisms of formation of metallic nanoparticles by laser ablation in a liquid medium. A modest study on the modeling of optical and thermal properties of the Laser-Nanoparticle interaction is discussed in this thesis. A modified Takami thermal model named MTM was also presented. Its important utility has been demonstrated for mechanisms for the interpretation of the mechanisms of laser-NPs interaction
Liu, P., G. W. Yang, H. B. Li i Y. Liang. "Laser ablation in liquid: from nanocrystals synthesis to nanostructures fabrication". Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20594.
Pełny tekst źródłaMessina, Elena. "Metal nanoparticles produced by Pulsed Laser Ablation in Liquid Environment". Thesis, Universita' degli Studi di Catania, 2011. http://hdl.handle.net/10761/109.
Pełny tekst źródłaPopovic, D. M., A. A. Zekic, M. Trtica i 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.
Pełny tekst źródłaYang, 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.
Pełny tekst źródłaLam, Julien. "Pulsed Laser Ablation in Liquid : towards the comprehension of the growth processes". Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10137/document.
Pełny tekst źródłaWhen a pulsed-laser is focused into a solid target immersed in water, the material is evaporated. Nucleation and growth occur in the liquid and nanoparticles are synthesized. The method can be considered as versatile because one can try to synthesize any kinds of materials. Also, the nanoparticles are directly stabilized by the solvant so there is no need of complexing agents. The nanoparticles are described as ligand-free. However, various processes can occur during the synthesis and the aim of my work is to understand these different components. Since the laser ablation in liquid displays a wide range of timescales, we used numerous methods to address this problem. First, I will present the use of plasma spectroscopy and the questions it raises towards local thermodynamic equilibrium. Then, I will describe our microscopic approach of nucleation based on quantum chemistry techniques. Finally, I will illustrate the advantages of shadowgraphic measurements to reach an hydrodynamic understanding of the system
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.
Pełny tekst źródłaKhan, 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.
Pełny tekst źródłaCamarda, 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.
Pełny tekst źródłaDiouf, 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.
Pełny tekst źródłaAlameer, 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.
Pełny tekst źródłaOkabayashi, 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.
Pełny tekst źródłaKosalathip, 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.
Pełny tekst źródłaThe study of thermoelectric nanostructured and nanocomposite materials is expanding because of the interest to multiply the number of interfaces and to decrease the size of the objects in order to improve the thermoelectric performance. We developed a new method to prepare thermoelectric n type (Bi0.95Sb0.05)2(Te0.95Se0.05)3 and p type (Bi0.2Sb0.8)2Te3 nanopowders, from the laser fracture in a liquid medium of powders of micrometric size. The developed cell preparation makes it possible to obtain per day approximately 200 mg of crystallized nanometric powders having the crystallographic structure of the initial powders and whose mean size lies between 7 and 12 nm. The mechanisms concerned in obtaining the nanoparticules were approached. They strongly depend on the density of energy of the laser beam. The nanopowders then were mechanically mixed with the micrometric powders of comparable nature and were cold pressed. The thermoelectric properties (electrical resistivity, thermoelectric power, thermal conductivity) of the nanocomposites were evaluated at room temperature. The first results show that even if the thermoelectric power is maintained in nanostructured and nanocomposite materials and that the total thermal conductivity can, in a completely exceptional way, being decreased by a factor two, the electrical resistivity obtained is hitherto too high to lead to high values of the dimensionless thermoelectric figure of merit, with regard to conventional bulk materials of same composition
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.
Pełny tekst źródłaMetal nanoparticles (NPs) exhibit unique optical properties (OP) coming from the collective oscillations of their electrons. This effect is translated by the emergence of a band of plasmon, the characteristics which can be modulated by the size, the shape and the nature of the NPs as well as by the environment of the host. There are many methods for the preparation of NPs, and one of them is the pulsed-laser ablation in liquid (PLAL). This technique offers some advantages such as simplicity, versatility and surface NP without contamination (reducing agent residues and/or stabilizers). Its main drawbacks are the lacks of productivity and control of the NP size and shape. This work is devoted to elaboration of Ag NPs by PLAL and theoretical investigation of their OP. We give here the results about the optimization of elaboration parameters leading to obtaining reproducible and controlled distributions of Ag NPs. The OP of these NPs are measured and compared to specific physical models based on the effective medium theory (EMT). Classical EMT such as Maxwell Garnett approximation allows describing the OP of monodisperse NPs. However, conventional preparation routes unavoidably conduct to NPs showing a shape and a size distribution which induces drastic changes in the OP. A SDEMT model which considers the shape dispersion is proposed for the calculation of the effective dielectric function and absorption coefficient of colloidal solution of metal NPs in water. Contrary to the conventional theory, this model gives a better description of the measured absorption and ellispometry spectra of sample containing Ag and Au NPs
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.
Pełny tekst źródłaTitle 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.
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.
Pełny tekst źródłaMalviya, 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.
Pełny tekst źródłaMalviya, 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.
Pełny tekst źródłaJo, Young Kyong. "Generation of Core/shell Nanoparticles with Laser Ablation". Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11660.
Pełny tekst źródłaFranjic, 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.
Pełny tekst źródłaKumarSubramani, Udaya, i 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.
Pełny tekst źródła國立成功大學
機械工程學系
104
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 laser processing for the fabrication of microstructure. Liquid-assisted laser processing (LALP) considered an idle method for the fabrication of polymer-based microstructure, reduces the defects relatively to the air assisted laser processing and benefits in a result of obtaining organised debris and size controlled bulges. The manipulation of the Laser Parameters, the Power, the Scanning speed, Points per inch, and nozzle air flow pressure over the different laser ablation techniques, liquid and Air, the organisation of Distribution of particles to sub-micrometre size possible. For the controlled parameters of laser ablation at a Power of 1.5 W, scanning speed of 57 mm/s, PPI of 1000 and nozzle air flow pressure of 1.42 psi the particles are found to be maximum. The Observed voltage and current in the TENG performance confirm the effect.
Do, Trong Mui, i 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.
Pełny tekst źródłaLin, Bo-Cheng, i 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.
Pełny tekst źródła國立中山大學
材料與光電科學學系研究所
100
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