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Influence of pulse frequency on synthesis of nano and submicrometer spherical particles by pulsed laser melting in liquid

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Title: Influence of pulse frequency on synthesis of nano and submicrometer spherical particles by pulsed laser melting in liquid
Authors: Sakaki, Shota Browse this author
Ikenoue, Hiroshi Browse this author
Tsuji, Takeshi Browse this author →KAKEN DB
Ishikawa, Yoshie Browse this author →KAKEN DB
Koshizaki, Naoto Browse this author →KAKEN DB
Keywords: Zinc oxide
Pulsed laser melting
Submicrometer particles
Issue Date: 30-Mar-2018
Publisher: Elsevier
Journal Title: Applied surface science
Volume: 435
Start Page: 529
End Page: 534
Publisher DOI: 10.1016/j.apsusc.2017.10.235
Abstract: Submicrometer spherical particles (SMSPs) are reported to be fabricated by pulsed laser irradiation with a frequency of 10 or 30 Hz onto raw nanoparticles dispersed in liquid. Here, the effect of the pulse frequency on particles obtained by laser irradiation onto the suspension in a vessel, especially at higher pulse frequencies up to 800 Hz, is investigated. At 200 Hz or lower, SMSPs of similar size can be fabricated, as at 10 or 30 Hz, by the same number of pulses. This indicates that the time required for particle fabrication can be greatly reduced and production efficiency can be improved using a high-frequency laser. In contrast, at 400 Hz or above, nanospherical particles (NSPs) are formed in addition to SMSPs, and the mass fraction of SMSPs is drastically decreased. This result suggests that consecutive laser pulse irradiation induces heat accumulation in particles and suspensions, resulting in a temperature increase and partial evaporation of the particles at 400 Hz or above. From the temperature increase of the suspension, the local temperature of the liquid surrounding the particles is believed to be increased by heat dissipation from the heated particles. Calculations suggest that an increase in the local liquid temperature would cause further heating of the particles.
Rights: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 榊 祥太

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