来源:Nature Communications 发布时间:2018/9/21 13:50:10
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西北工业大学研究者逆向操作:控制液滴形成气泡

论文标题:Inducing drop to bubble transformation via resonance in ultrasound

期刊:Nature Communications

作者:Duyang Zang, Lin Li, Wenli Di, Zehui Zhang, Changlin Ding, Zhen Chen, Wei Shen, Bernard P. Binks & Xingguo Geng

发表时间:2018/09/11

数字识别码:10.1038/s41467-018-05949-0

原文链接:https://www.nature.com/articles/s41467-018-05949-0?utm_source=Other_website&utm_medium=Website_links&utm_content=RenLi-MixedBrand-multijournal-Multidisciplinary-China&utm_campaign=ORG_USG_JRCN_RL_article_promotion_sciencenet_Sep_3rd

微信链接:https://mp.weixin.qq.com/s/zvdcXHODeqYEJTRCBO17_Q

一般来说,气泡破裂后会产生液滴,但《自然-通讯》本周的一篇论文Inducing drop to bubble transformation via resonance in ultrasound描述了一种逆向操作的方法——让液滴转变为气泡。这一研究成果有助于找到液-液界面的操纵方式,对软物质制造具有潜在的应用价值。

图1:声悬浮液滴从液滴到气泡的转变过程 图源:Zang 等

声悬浮能让液滴在声波作用下悬浮在空中,是液滴动力学研究的常用技术。声压可以把液滴压扁成很薄的液膜,并诱导屈曲现象,从而实现液滴的变形。

中国西北工业大学的臧渡洋及同事将这些已观察到的现象相结合,以对气泡的形成进行控制。作者先通过声辐射力将液滴压成薄片状的液膜,再通过超声场让液膜弯曲成碗状,内部为共振腔。作者发现,共振会让腔体扩大,并引导周围的液面弯曲,最后收缩成一个闭合的气泡点击微信链接观看气泡形成过程)。

作者观察到的这一过程或指出了一条形成气泡的新途径——对于食品、化妆品及制药行业的泡沫制备具有潜在的应用价值。

摘要:Bubble formation plays an important role in industries concerned with mineral flotation, food, cosmetics, and materials, which requires additional energy to produce the liquid–gas interfaces. A naturally observed fact is, owing to the effect of surface tension, a bubble film tends to retract to reduce its surface area. Here we show a “reverse” phenomenon whereby a drop is transformed into a bubble using acoustic levitation via acoustic resonance. Once the volume of the cavity encapsulated by the buckled film reaches a critical value V*, resonance occurs and an abrupt inflation is triggered, leading to the formation of a closed bubble. Experiments and simulations both reveal that V* decreases with increasing acoustic frequency, which agrees well with acoustic resonance theory. The results afford enlightening insights into acoustic resonance and highlight its role in manipulating buckled fluid–fluid interfaces, providing a reference for fabricating unique core–shell-like materials.

阅读论文全文请访问:https://www.nature.com/articles/s41467-018-05949-0?utm_source=Other_website&utm_medium=Website_links&utm_content=RenLi-MixedBrand-multijournal-Multidisciplinary-China&utm_campaign=ORG_USG_JRCN_RL_article_promotion_sciencenet_Sep_3rd

期刊介绍:Nature Communications (https://www.nature.com/ncomms/) is an open access journal that publishes high-quality research from all areas of the natural sciences. Papers published by the journal represent important advances of significance to specialists within each field.

The 2017 journal metrics for Nature Communications are as follows:

•2-year impact factor: 12.353

•5-year impact factor: 13.691

•Immediacy index: 1.829

•Eigenfactor® score: 0.92656

•Article Influence Score: 5.684

•2-year Median: 8

(来源:科学网)

 
 
 
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