Citation

Tan, Han Yi and Ong, Guang Liang and Nee, Chen Hon and Tou, Teck Yong and Yap, Seong Ling and Sanz-Navarro, Carlos Federico and Lee, Siaw Foon and Yap, Seong Shan (2025) The role of turbulence in bottom-up nanoparticle synthesis using ultrafast laser filamentation in ethanol. Journal of the Mechanical Behavior of Materials, 34 (1). ISSN 2191-0243

Text 10.1515_jmbm-2025-0059.pdf - Published Version Restricted to Repository staff only Download (1MB)

Abstract

Ultrafast laser filamentation in liquids based on nonlinear optical phenomenon is a new method for bottom-up nanoparticle synthesis. The process is able to synthesize nanomaterials such as nanodiamonds from the liquid precursor. However, the process occurs in a transparent liquid medium and the generation is limited to the interaction volume of the laser beam. In the current work, the effects of turbulence on ultrafast laser filamentation are investigated in an attempt to increase the generation rate. A fixed laser energy, at about ten times the threshold of filamentation in ethanol, is used to ensure persistent filamentation below the vaporization limit. Turbulence in the ethanol precursor was introduced by a high laser repetition rate, mechanical motion, and ultrasonication. The effects were investigated by absorbance measurements of the ethanol sample after laser filamentation, which correlates with the concentration of nanoparticles. For a fixed number of laser pulses, higher absorbance was observed on the sample prepared using a higher repetition rate (53% for 3 kHz compared to 1 kHz). The absorbance of the sample obtained by laser filamentation with cuvette motion increased by ∼22% compared to the stationary sample. Finally, when laser synthesis was performed with ultrasonication, the highest increase in absorbance was obtained (∼61%). The mechanisms that contributed to the increase are discussed.

Item Type:	Article
Uncontrolled Keywords:	nanoparticles synthesis; ultrafast laser filamentation; turbulence; ultrafast laser processing
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK452-454.4 Electric apparatus and materials. Electric circuits. Electric networks
Divisions:	Faculty of Engineering (FOE)
Depositing User:	Ms Suzilawati Abu Samah
Date Deposited:	01 Jul 2025 02:15
Last Modified:	01 Jul 2025 02:15
URII:	http://shdl.mmu.edu.my/id/eprint/14209

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