Journal
LAB ON A CHIP
Volume 14, Issue 4, Pages 744-749Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3lc51176f
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Funding
- Early Career Scheme from the Research Grants Council of Hong Kong [HKU 707712P]
- Basic Research Program-General Program from the Science and Technology Innovation Commission of Shenzhen Municipality [JC201105190878A]
- Young Scholars Program from the National Natural Science Foundation of China [NSFC51206138/E0605, 201109176165]
- University Development Fund (UDF) on A Soft Lithography System for Fabrication of Microfluidic Devices from the University of Hong Kong
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We report a new method to display the minute fluctuations induced by syringe pumps on microfluidic flows by using a liquid-liquid system with an ultralow interfacial tension. We demonstrate that the stepper motor inside the pump is a source of fluctuations in microfluidic flows by comparing the frequencies of the ripples observed at the interface to that of the pulsation of the stepper motor. We also quantify the fluctuations induced at different flow rates, using syringes of different diameters, and using different syringe pumps with different advancing distances per step. Our work provides a way to predict the frequency of the fluctuation that the driving syringe pump induces on a microfluidic system and suggests that syringe pumps can be a source of fluctuations in microfluidic flows, thus contributing to the polydispersity of the resulting droplets.
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