NDLI: Formation mechanism of submicrometer spherical particles during pulsed laser melting in liquid deduced from pulse width dependence

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Formation mechanism of submicrometer spherical particles during pulsed laser melting in liquid deduced from pulse width dependence

Content Provider	Semantic Scholar
Author	Sakaki, Syota Koshizaki, Naoto Ikenoue, Hiroshi Ishikawa, Yoshie Tsuji, Takeshi
Copyright Year	2016
Abstract	はじめに液中レーザー溶融法は液中に分散した粒子にナノ秒パルスレーザーを照射して,サブミクロンサイズかつ球状な粒子を得る手法である[1].瞬間的に粒子を加熱することで液体への熱損失が低減され,液中で粒子を溶融・凝固させて球状な粒子が合成できる[2].しかし,この粒子の生成過程は現象の観察が困難なため明らかになっていない.そこで,パルス幅(加熱時間)が生成粒子に与える影響を評価し,それを基に物理モデルを構築して粒子の加熱・冷却過程を検討した. 実験本実験では Nd:YAG レーザー(Continuum, 波長 355 nm,パルス幅 7 ns)と KrF エキシマレーザー(Gigaphoton,波長 248 nm,パルス幅 50 ns)を使用し,超純水中に分散させた ZnO 粒子 (Aldrich,粒子径 < 100 nm)に照射した.その結果,パルス幅が大きくなるとサブミクロン球状粒子の生成に必要なレーザーフルーエンスが大きくなり,生成粒子の平均サイズが小さくなった (Fig. 1).これは,パルス幅が増加すると冷却過程の影響が大きくなり,吸収したエネルギーが粒子から周囲の液体に拡散するためと考えられる. モデル光学と伝熱工学から,粒子に蓄積するエネルギーE(t)の微分方程式(1)を求めた. dE dt = Qabs λ ∙ π 4 d ∙ J(t) − h ∙ πd ∙ {T(t) − T0} (1)
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Alternate Webpage(s)	https://confit.atlas.jp/guide/event-img/jsap2016s/20a-W321-9/public/pdf?type=in
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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