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首页> 外文期刊>Analytical chemistry >Controlled Chemistry via Contactless Manipulation and Merging of Droplets in an Acoustic Levitator
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Controlled Chemistry via Contactless Manipulation and Merging of Droplets in an Acoustic Levitator

机译：通过非接触式操纵和液滴合并在声悬浮器中的控制化学

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摘要

A unique, versatile, and material-independent approach to manipulate contactlessly and merge two chemically distinct droplets suspended in an acoustic levitator is reported. Large-amplitude axial oscillations are induced in the top droplet by low-frequency amplitude modulation of the ultrasonic carrier wave, which causes the top sample to merge with the sample in the pressure minimum below. The levitator is enclosed within a pressure-compatible process chamber to enable control of the environmental conditions. The merging technique permits precise control of the substances affecting the chemical reactions, the sample temperature, the volumes of the liquid reactants down to the picoliter range, and the mixing locations in space and time. The performance of this approach is demonstrated by merging droplets of water (H2O) and ethanol (C2H5OH), conducting an acid-base reaction between aqueous droplets of sodium hydroxycarbonate (NaHCO3) and acetic acid (CH3COOH), the hypergolic explosion produced via merging a droplet of an ionic liquid with nitric acid (HNO3), and the coalescence of a solid particle (CuSO4 center dot 5H(2)O) and a water droplet followed by dehydration using a carbon dioxide laser. The physical and chemical changes produced by the merging are traced in real time via complementary Raman, Fourier-transform infrared, and ultraviolet-visible spectroscopies. The concept of the contactless manipulation of liquid droplets and solid particles may fundamentally change how scientists control and study chemical reactions relevant to, for example, combustion systems, material sciences, medicinal chemistry, planetary sciences, and biochemistry.
机译：据报道，一种独特的多功能和物质独立的方法，可接触地操纵并合并两个在声悬浮器中悬挂在声悬浮器中的化学上不同的液滴。通过超声波载波的低频幅度调制在顶部液滴中引起大幅度轴向振荡，这使得顶部样品在下面的压力最小值中与样品合并。悬浮器封闭在压力兼容的加工室内，以实现对环境条件的控制。合并技术允许精确控制影响化学反应的物质，样品温度，液体反应物的体积下降到Picoliter范围，以及空间和时间的混合位置。通过合并水（H 2 O）和乙醇（C 2 H 5 OH）的液滴，在羟基碳酸氢钠（NaHCO 3）和乙酸（CH 3 COOH）之间进行酸碱反应来证明这种方法的性能，通过合并A产生的高胆爆炸离子液体用硝酸（HNO3）的液滴，以及固体颗粒（CuSO4中心点5h（2）O）的聚结（CuSO4中心点）和水滴，然后使用二氧化碳激光脱水。通过互补拉曼，傅立叶变换红外和紫外线可见光镜，通过互补产生的合并产生的物理和化学变化。液滴和固体颗粒的非接触式操作的概念可能会从根本上改变科学家控制和研究与例如燃烧系统，材料科学，药物化学，行星科学和生物化学相关的化学反应。

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