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Droplet Demulsification Using Ultralow Voltage-Based Electrocoalescence
Langmuir ( IF 3.7 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1021/acs.langmuir.7b03323
A. Srivastava 1 , S. Karthick 1 , K. S. Jayaprakash 1 , A. K. Sen 1
Affiliation  

Demulsification of droplets stabilized with surfactant is very challenging due to their low surface energy. We report ultralow voltage-based electrocoalescence phenomenon for the demulsification of aqueous droplets with an aqueous stream. In the absence of electric field, due to the disjoining pressure resulting from the tail–tail interaction between the surfactant molecules present on the aqueous droplets and interface, coalescence of aqueous droplets with the aqueous stream is prevented. However, above a critical electric field, the electrical stress overcomes the disjoining pressure, thus leading to the droplet coalescence. The influence of surfactant concentration, droplet diameter, and velocity on the electrocoalescence phenomena is studied. The macroscopic contact between the aqueous droplet with the aqueous stream enables droplet coalescence at much lower voltage (10 to 90 V), which is at least two orders of magnitude smaller than voltages used in prior works (1.0 to 3.0 kV). The electrocoalescence phenomena is used for the extraction of microparticles encapsulated in aqueous droplets into the aqueous stream and size-based selective demulsification. A new paradigm of droplet electrocoalescence and content extraction is presented that would find significant applications in chemistry and biology.

中文翻译:

使用基于超低电压的电凝聚法进行液滴破乳

用表面活性剂稳定的液滴的破乳作用非常困难,因为它们的表面能低。我们报告了超低电压的电凝聚现象,用于水流中的水滴的破乳。在没有电场的情况下,由于存在于水滴和界面上的表面活性剂分子之间的尾部相互作用引起的分离压力,可以防止水滴与水流的聚结。然而,在临界电场之上,电应力克服了分离压力,因此导致液滴聚结。研究了表面活性剂浓度,液滴直径和速度对电凝聚现象的影响。水性液滴与水性物流之间的宏观接触使得液滴可以在低得多的电压(10至90 V)下聚结,该电压比现有技术中使用的电压(1.0至3.0 kV)小至少两个数量级。电聚结现象用于将包裹在水滴中的微粒提取到水流中,并进行基于尺寸的选择性破乳。提出了液滴电凝聚和含量提取的新范例,该范例将在化学和生物学中找到重要的应用。电聚结现象用于将包裹在水滴中的微粒提取到水流中,并进行基于尺寸的选择性破乳。提出了液滴电凝聚和含量提取的新范例,该范例将在化学和生物学中找到重要的应用。电聚结现象用于将包裹在水滴中的微粒提取到水流中,并进行基于尺寸的选择性破乳。提出了液滴电凝聚和含量提取的新范例,该范例将在化学和生物学中找到重要的应用。
更新日期:2018-01-17
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