Electrospray mode transition of microdroplets with semiconductor nanoparticle suspension.
Electrospray mode transition of microdroplets with semiconductor nanoparticle suspension.
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DOI：
10.1038/s41598-017-05175-6
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发表时间：
2017-07-11
影响因子：
4.6
通讯作者：
Kumar R
中科院分区：
文献类型：
--
作者：
Castillo-Orozco E;Kar A;Kumar R
电喷雾根据流速和电势以几种模式操作。这允许将含有纳米颗粒的液滴沉积成离散的纳米点阵列以制造各种电子器件。在这项研究中，七个不同的悬浮液具有不同的性能进行了研究。在滴下模式下，归一化液滴尺寸随电毛细管数Ca e（电与表面张力之比）线性减小，直至Ca e ≥ 1.0。由于毛细管数很小，粘性力的影响在滴液模式下可以忽略不计。在低雷诺数下，随着Ca e的增大，微滴模式转变为微滴模式，然后转变为平面振荡微滴模式。对于Ca e > 3.3，标准化液滴尺寸几乎保持恒定在0.07。发现在2 ≤ Ca e ≤ 2.5范围内出现微滴模式，这对沉积离散纳米点阵列是重要的。液滴频率从滴液模式到微滴模式稳定增加，但在振荡微滴模式中保持大致恒定。这项工作提供了一个物理基础，通过该基础可以选择任何纳米悬浮液的流速和电压，以在预定的液滴尺寸和液滴频率下精确地在微滴模式下操作。
Electrosprays operate in several modes depending on the flow rate and electric potential. This allows the deposition of droplets containing nanoparticles into discrete nanodot arrays to fabricate various electronic devices. In this study, seven different suspensions with varying properties were investigated. In the dripping mode, the normalized dropsize decreases linearly with electric capillary number, Ca e, (ratio of electric to surface tension forces) up to Ca e ≈ 1.0. The effect of viscous forces is found to be negligible in the dripping mode since the capillary number is small. For flow rates with low Reynolds number, the mode changes to microdripping mode, and then to a planar oscillating microdripping mode as Ca e increases. The normalized dropsize remains nearly constant at 0.07 for Ca e > 3.3. The microdripping mode which is important for depositing discrete array of nanodots is found to occur in the range, 2 ≤ Ca e ≤ 2.5. The droplet frequency increases steadily from dripping to microdripping mode, but stays roughly constant in the oscillating microdripping mode. This work provides a physical basis by which the flow rate and the voltage can be chosen for any nanosuspension to precisely operate in the microdripping mode at a predetermined dropsize and droplet frequency.
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影响因子：
8.6
作者：
Ganan-Calvo, AM
通讯作者：
Ganan-Calvo, AM
影响因子：
2.4
作者：
Muhammad, Nauman Malik;Sundharam, Sridharan;Choi, Kyung-Hyun
通讯作者：
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影响因子：
19.6
作者：
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Basaran, Osman A.
影响因子：
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作者：
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影响因子：
8.6
作者：
Marin, Alvaro G.;Loscertales, Ignacio G.;Barrero, A.
通讯作者：
Barrero, A.