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您的检索式：作者名="Bilal Gokce"
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| 1 | Comparison of ultrashort pulse ablation of gold in air and water by time-resolved experiments显示文摘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 material.Over the last decades,numerous experimental and computational studies aimed to reveal the transient processes governing laser ablation in liquids.Most experimental studies investigated the involved processes on timescales ranging from nanoseconds to microseconds.However,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 timeframe.Furthermore,experimental investigations of the early timescales are required to test computational predictions.We visualize the complete spatiotemporal picosecond laser-induced ablation dynamics of gold immersed in air and water using ultrafast pump-probe microscopy.Transient reflectivity measurements reveal that the water confinement layer significantly influences the ablation dynamics on the entire investigated timescale from picoseconds to microseconds.The 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 timescale.Moreover,we are able to locate the temporal appearance of secondary nanoparticles at about 600 ps after pulse impact.The results support computational predictions and provide valuable insight into the early-stage ablation dynamics governing laser ablation in liquids. | Maximilian Spellauge Carlos Donate-Buendia Stephan Barcikowski Bilal Gokce Heinz P.Huber | 2022 | Light(Science & Applications)2022，11，4： | 0 |
| 2 | Characterizing bubble interaction effects in synchronous-double-pulse laser ablation for enhanced nanoparticle synthesis显示文摘To further advance nanomaterial applications and reduce waste production during synthesis,greener and sustainable production methods are necessary.Pulsed laser ablation in liquid(PLAL)is a green technique that enables the synthesis of nanoparticles.This study uses synchronous-double-pulse PLAL to understand bubble interaction effects on the nanoparticle size.By adjusting the lateral separation of the pulses relative to the maximum bubble size,an inter-pulse separation is identified where the nanoparticle size is fourfold.The cavitation bubble pair interaction is recorded using a unique coaxial diffuse shadowgraphy system.This 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 velocity.It is found that the collision and collapse of the bubbles generated at a certain inter-pulse separation results in a larger nanoparticle size.These 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 size.The experimentally observed trends are confirmed by numerical simulations with high spatial and temporal resolution.This 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. | FARBOD RIAHI ALEXANDER BUßMANN CARLOS DONATE-BUENDIA STEFAN ADAMI NICOLAUS AADAMS STEPHAN BARCIKOWSKI BILAL GOKCE | 2023 | Photonics Research2023，11，12： | 0 |
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