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2005.03.09

階段を上る油滴−まるでスライム(笑)

Yahoo!NEWSより「自分で動き回る油滴発見 周囲との化学反応で駆動」(共同通信)

小さな油滴がアメーバのように自発的に階段を上ったり、ぐるっと一回転したり−。生物ではない油滴がまるで生物のように周囲からエネルギーをもらって動く不思議な現象を吉川研一京都大教授らの研究チームが8日までに発見、米物理学誌フィジカル・レビュー・レターズに発表した。
動き回る油滴油滴が動き回るビデオがここにあります。これを見れば、油滴が直線上を往復運動する様子、ジェットコースターのループのように垂直な円運動をする様子、そして何と階段を上る様子を見ることができます。

油滴が何か生物に見えて不思議なものです。

研究チームはヨウ化カリウムを含む油を界面活性剤の溶液の中におきました。すると油滴が生物であるかのように動き回ったとのこと。静電気的エネルギーか化学エネルギーを周囲からもらって駆動しているようですが、もしこの原理で駆動する機関ができた場合、廃熱を出すこともなく通常の内燃機関よりも高い効率で動くことができそうです。

吉川教授は「胃腸や血管の内部に入り込み、周囲の物質からエネルギーをもらって働く、医療用の微小装置開発につながる可能性もある」と話している。チームは吉川教授のほか大学院生の住野豊さんと浜田勉さん、馬籠信之名古屋文理大講師。
見ているだけで面白い現象です。

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