要準確地移動固體並不是難事,但要精準控制液體流動的話就絕對不簡單了。925Please respect copyright.PENANA4FanAvOhJT
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(圖2)近日香港大學的科學家們研發出一種三層物料(Ref1),展示出精準控制液體流動的手段。925Please respect copyright.PENANA9egnqCmBwU
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物料的外層為排斥液體層,只要液體的體積控制在一定的程度下,水、酒精及各式各樣的液體將會被鎖定為水珠狀,不會仙女散花灑在地上。925Please respect copyright.PENANATkmHBkxRX8
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而物料的中心層則有著把熱力轉化成為電力的特質,底層則有光線轉化成熱力的特性。925Please respect copyright.PENANAzjjRVgLtol
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當利用激光照射到物料後,底層的物料便會將光線轉化成為熱能,其熱力將會在中心層轉化為為電能,而中心層電能的電極則會吸引位於上層的液體水珠前來。925Please respect copyright.PENANAyS6lHNUO8j
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(圖3)利用這個機制,他們可以任意操控液體的移動方向,使水珠反地心吸力行走,甚至是把兩顆水珠混合在一起。925Please respect copyright.PENANArM84AHfFv5
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(圖4)把水珠混合在一起後,他們亦有能力把水珠一分為二,甚至能精準切割水珠的大小。925Please respect copyright.PENANAlttBCchBrz
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(圖5)如果利用水珠製成「汽車」輪胎的話,甚至可以利用激光引領「汽車」行走。925Please respect copyright.PENANA9P7NfVgZSJ
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在越來講求精準的時代,這種控制液體的手法將會帶來無窮的可能性。舉例來說,科學家可以透過光線調控腐蝕性液體與物件接觸的時間、研究多種液體混合的化學作用等等。925Please respect copyright.PENANAoIQu59cOaf
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Ref1:https://advances.sciencemag.org/content/6/38/eabc1693
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