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Article

Measuring Surface and Interfacial Tension In Situ in Microdripping Mode for Electrohydrodynamic Applications

1
CerFlux, Inc., Birmingham, AL 35205, USA
2
School of Medicine and School of Engineering, University of Alabama at Birmingham (UAB), Birmingham, AL 35294, USA
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(7), 687; https://doi.org/10.3390/mi11070687
Received: 18 June 2020 / Revised: 6 July 2020 / Accepted: 7 July 2020 / Published: 16 July 2020
(This article belongs to the Special Issue Microfluidics: Tissue Chips and Microphysiological Systems)
Walking on water is made possible, at least for tiny insects, by molecular interaction at the interfaces of dissimilar materials. Impact of these interactions—surface tension (SFT) and, more broadly, interfacial tension (IFT)—is particularly evident at micro and nano sizescales. Thus, implications of walking on water can be significant for SFT or IFT (S/IFT)-driven nanofabrication technologies, such as electrohydrodynamic atomization (EHDA), in developing next generation biomimetic microphysiological systems (MPS) and drug delivery systems (DDS). However, current methods for estimating S/IFT, based on sessile drops or new surface formation on a ring or plate, are unsuitable for integration with EHDA assemblies used in electrospinning and electrospraying. Here, we show an in situ method for estimating S/IFT specifically devised for EHDA applications using signal processing algorithms that correlate the frequency and periodicity of liquid dispensed in EHDA microdripping mode with numerical solutions from computational fluid dynamics (CFD). Estimated S/IFT was generally in agreement with published ranges for water–air, 70% ethanol–air, chloroform–air, and chloroform–water. SFT for solutions with surfactants decreased with increasing concentrations of surfactant, but at relatively higher than published values. This was anticipated, considering that established methods measure SFT at boundaries with asymmetrically high concentrations of surfactants which lower SFT. View Full-Text
Keywords: nanofabrication; tissue engineering; microphysiological systems; drug delivery systems; electrospinning; electrospraying; surface tension; computational fluid dynamics nanofabrication; tissue engineering; microphysiological systems; drug delivery systems; electrospinning; electrospraying; surface tension; computational fluid dynamics
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MDPI and ACS Style

Budhwani, K.I.; Pekmezi, G.M.; Selim, M.M. Measuring Surface and Interfacial Tension In Situ in Microdripping Mode for Electrohydrodynamic Applications. Micromachines 2020, 11, 687. https://doi.org/10.3390/mi11070687

AMA Style

Budhwani KI, Pekmezi GM, Selim MM. Measuring Surface and Interfacial Tension In Situ in Microdripping Mode for Electrohydrodynamic Applications. Micromachines. 2020; 11(7):687. https://doi.org/10.3390/mi11070687

Chicago/Turabian Style

Budhwani, Karim I.; Pekmezi, Gerald M.; Selim, Mohamed M. 2020. "Measuring Surface and Interfacial Tension In Situ in Microdripping Mode for Electrohydrodynamic Applications" Micromachines 11, no. 7: 687. https://doi.org/10.3390/mi11070687

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