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Laser generation of nanoparticles in liquids : new insights on crystal structure control and colloidal stability

Abstract : Laser generation of nanoparticles in liquids : new insights on crystal structure control and colloidal stability The great interest of nanoparticles for their original physical and an chemical properties has been supported by the development of numerous methods of synthesis. In the nineties, laser generation of nanoparticles in liquids appeared, including Pulsed Laser Ablation in Liquids (PLAL). The PLAL technique enables to produce surface free particles for plenty of material and solvent combinations. However, the apparent simplicity of its implementation hides complex physico-chemical mechanisms resulting in a lack of control of the final products. We firstly investigated the dynamics of the laser-generated bubbles for which the PLAL extreme conditions present new studied cases of bubbles dynamics not encountered in the field of fluid mechanics. Then, we aim to bring new insights into better control of the nanoparticles morphology and their colloidal stability. A straight way to tune sizes, crystal structures and the colloidal stability consists in the addition of stabilizing agents. Hence, we investigated the mechanisms of stabilization of colloidal gold using complexing ions. We also succeed to synthesis nano-rubies, i.e. chromium doped corundum alumina nanoparticles, unexpected at nanoscale. The stabilization of the metastable crystal structure using ligands is explained thanks to a comprehensive theoretical approach
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https://tel.archives-ouvertes.fr/tel-02339184
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Submitted on : Wednesday, October 30, 2019 - 12:09:22 PM
Last modification on : Monday, October 19, 2020 - 10:54:28 AM

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  • HAL Id : tel-02339184, version 1

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Gaétan Laurens. Laser generation of nanoparticles in liquids : new insights on crystal structure control and colloidal stability. Materials Science [cond-mat.mtrl-sci]. Université de Lyon, 2019. English. ⟨NNT : 2019LYSE1161⟩. ⟨tel-02339184⟩

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