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Comparison of ultrashort pulse ablation of gold in air and water by time-resolved experiments

Light(Science & Applications) 2022年第4期11卷 615-627页

作者： Maximilian Spellauge Carlos Donate-Buendia Stephan Barcikowski bilal gokce Heinz P.Huber Department of Applied Sciences and Mechatronics Munich University of Applied SciencesLothstraBe 3480335 MunichGermany Technical Chemistry I and Center for Nanointegration Duisburg-Essen(CENIDE) University of Duisburg-Essen45141 EssenGermany Materials Science and Additive Manufacturing School of Mechanical Engineering and Safety EngineeringUniversity of Wuppertal42119 WuppertalGermany

Laser ablation in liquids is a highly interdisciplinary method at the intersection of physics and chemistry that offers the unique opportunity to generate surfaaant-free and stable nanoparticles from virtually any *** the last decades,numerous experimental and computational studies aimed to reveal the transient processes governing laser ablation in *** experimental studies investigated the involved processes on timescales ranging from nanoseconds to ***,the ablation dynamics occurring on a sub-nanosecond timescale are of fundamental importance,as the conditions under which nanoparticles are generated are established within this ***,experimental investigations of the early timescales are required to test computational *** visualize the complete spatiotemporal picosecond laser-induced ablation dynamics of gold immersed in air and water using ultrafast pump-probe *** reflectivity measurements reveal that the water confinement layer significantly influences the ablation dynamics on the entire investigated timescale from picoseconds to *** influence of the water confinement layer includes the electron injection and subsequent formation of a dense plasma on a picosecond timescale,the confinement of ablation products within hundreds of picoseconds,and the generation of a cavitation bubble on a nanosecond ***,we are able to locate the temporal appearance of secondary nanoparticles at about 600 ps after pulse *** results support computational predictions and provide valuable insight into the early-stage ablation dynamics governing laser ablation in liquids.

关键词： pulse ultrashort pump

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Characterizing bubble interaction effects in synchronous-double-pulse laser ablation for enhanced nanoparticle synthesis

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Photonics Research 2023年第12期11卷 2054-2071页

作者： FARBOD RIAHI ALEXANDER BUßMANN CARLOS DONATE-BUENDIA STEFAN ADAMI NICOLAUS AADAMS STEPHAN BARCIKOWSKI bilal gokce Chair of Materials Science and Additive Manufacturing School of Mechanical Engineering and Safety EngineeringUniversity of Wuppertal42119 WuppertalGermany Chair of Aerodynamics and Fluid Mechanics School of Engineering and DesignTechnical University of Munich85748 Garching bei MünchenGermany Munich Institute of Integrated Materials Energyand Process Engineering(MEP)Technical University of Munich85748 Garching bei MünchenGermany Technical Chemistry I and Center for Nanointegration Duisburg-Essen(CENIDE) University of Duisburg-Essen45141 EssenGermany

To further advance nanomaterial applications and reduce waste production during synthesis,greener and sustainable production methods are *** laser ablation in liquid(PLAL)is a green technique that enables the synthesis of *** study uses synchronous-double-pulse PLAL to understand bubble interaction effects on the nanoparticle *** adjusting the lateral separation of the pulses relative to the maximum bubble size,an inter-pulse separation is identified where the nanoparticle size is *** cavitation bubble pair interaction is recorded using a unique coaxial diffuse shadowgraphy *** system allows us to record the bubble pair interaction from the top and side,enabling the identification of the bubble’s morphology,lifetime,volumetric,and displacement *** is found that the collision and collapse of the bubbles generated at a certain inter-pulse separation results in a larger nanoparticle *** results mark a significant advancement by controlling the abundance of larger nanoparticles in PLAL,where previous efforts were primarily focused on reducing the average nanoparticle *** experimentally observed trends are confirmed by numerical simulations with high spatial and temporal *** study serves as a starting point to bridge the gap between upscaled multi-bubble practices and fundamental knowledge concerning the determinants that define the final nanoparticle size.

关键词： interaction synthesis bubble

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