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Droplet Manipulation with Feedback Control.

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Title:Droplet Manipulation with Feedback Control.
Authors:Yu, Shi-Cheng (Kyle)
Contributors:Mechanical Engineering (department)
Date Issued:Dec 2017
Publisher:University of Hawaiʻi at Mānoa
Abstract:Droplet manipulation has an important role in a wide range of scientific and industrial
applications, such as thin film, soft matter, microfluidics, biophysical simulations, interfacial
reactions, and interfacial rheology. We developed a feedback-controlled closed-loop
axisymmetric drop shape analysis (CL-ADSA) to manipulate millimeter-sized droplets, based on
the experimental methodology constrained drop surfactometer (CDS). With CL-ADSA, we
extended the CDS from a surface tension measurement tool to a sophisticated droplet
manipulation instrument. We demonstrated the usefulness of this methodology in three practical
applications, control of droplet volume by automatically compensating natural evaporation,
precise control of surface area variations for high-fidelity biophysical simulations of natural
pulmonary surfactant, and steady control of surface pressure for in situ Langmuir-Blodgett
transfer from droplets. Furthermore, we developed an arbitrary waveform generator for
controlled oscillation of a droplet/bubble. We demonstrated this methodology in three ways.
First, we demonstrated arbitrary waveform generation by controlling the volume and surface area
of a water droplet to sine, triangle, square, and sawtooth waveforms. Second, we evaluated the
accuracy of the arbitrary waveform generation through a coefficient of determination analysis.
Third, we apply arbitrary waveform generation to study the interfacial dilational rheology of
adsorbed surfactant films. Our studies suggest the feedback control system developed in this
thesis hold great promise for advancing droplet manipulation in a variety of material and surface
science applications, such as thin-film fabrication, self-assembly, and biophysical study of
pulmonary surfactants.
Description:M.S. Thesis. University of Hawaiʻi at Mānoa 2017.
URI:http://hdl.handle.net/10125/62532
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Mechanical Engineering


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