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Pulse-Width Dependence of the Cooling Effect on Sub-Micrometer ZnO Spherical Particle Formation by Pulsed-Laser Melting in a Liquid

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Title: Pulse-Width Dependence of the Cooling Effect on Sub-Micrometer ZnO Spherical Particle Formation by Pulsed-Laser Melting in a 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
Issue Date: 5-May-2017
Publisher: Wiley
Journal Title: ChemPhysChem
Volume: 18
Issue: 9
Start Page: 1101
End Page: 1107
Publisher DOI: 10.1002/cphc.201601175
PMID: 28052480
Abstract: Sub‐micrometer spherical particles can be synthesized by irradiating particles in a liquid with a pulsed laser (pulse width: 10 ns). In this method, all of the laser energy is supposed to be spent on particle heating because nanosecond heating is far faster than particle cooling. To study the cooling effect, sub‐micrometer spherical particles are fabricated by using a pulsed laser with longer pulse widths (50 and 70 ns). From the increase in the laser‐fluence threshold for sub‐micrometer spherical particle formation with increasing pulse width, it is concluded that the particles dissipate heat to the surrounding liquid, even during several tens of nanoseconds of heating. A particle heating–cooling model considering the cooling effect is developed to estimate the particle temperature during laser irradiation. This model suggests that the liquid surrounding the particles evaporates, and the generated vapor films suppress heat dissipation from the particles, resulting in efficient heating and melting of the particles in the liquid. In the case of small particle sizes and large pulse widths, the particles dissipate heat to the liquid without forming such vapor films.
Rights: This is the peer-reviewed version of the following article: ChemPhysChem 18(9) pp. 1101-1107 May 5 2017, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley-VCH Terms and Conditions for Self-Archiving.
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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