Fabrication of immiscible alloy particles utilizing laser process in liquid

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630341
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Metal making/Resorce production engineering
• Research Institution: Hokkaido University
• Principal Investigator: KOSHIZAKI Naoto 北海道大学, 工学(系)研究科(研究院), 教授 (40344197)
• Co-Investigator(Kenkyū-buntansha): NAKAMURA Takahiro 東北大学, 多元物質科学研究所, 助教 (50400429)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 液中レーザー溶融法 / パルス加熱 / 局所加熱 / 非相溶性合金 / 2成分コロイド溶液 / レーザー照射 / 非集光 / Au-Fe

Outline of Final Research Achievements

Pulsed laser melting in liquid environment is a novel technique to produce submicrometer spherical particles of various materials by dispersing raw particles in liquid and irradiating pulsed laser with appropriate fluence. Here we investigate two-component raw particle mixture case aiming for fabricating submicrometer spherical particles of immiscible alloys.
Raw nanoparticles of Au and iron oxide dispersed in ethanol were mixed with different weight ratio and irradiated by a third harmonic of Nd:YAG laser. Submicrometer spherical particles were formed in all concentration range. In low Au concentration range, phase-separated particles were observed, while in high range homogeneous particles were obtained, indicating Au-Fe alloy formation. Furthermore, by repetitive laser irradiation, composition ratio between Au to Fe was gradually approached to the thermodynamically stable alloy composition. Therefore, shorter laser irradiation time is favorable to obtain immiscible alloy particles.

Free Research Field

ナノ材料化学