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Synthesis and Characterization of Novel Perfluorocarbon Endoskeletal Droplets.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synthesis and Characterization of Novel Perfluorocarbon Endoskeletal Droplets./
作者:	Shakya, Gazendra.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	138 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-07, Section: B.
Contained By:	Dissertations Abstracts International83-07B.
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28720759
ISBN:	9798762105873

Synthesis and Characterization of Novel Perfluorocarbon Endoskeletal Droplets.
Shakya, Gazendra.

Synthesis and Characterization of Novel Perfluorocarbon Endoskeletal Droplets. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 138 p.

Source: Dissertations Abstracts International, Volume: 83-07, Section: B.

Thesis (Ph.D.)--University of Colorado at Boulder, 2021.

This item must not be sold to any third party vendors.

Droplet emulsions have demonstrated unique capabilities in various sensing and imaging applications. In this report, we introduce a novel complex droplet called "Endoskeletal" droplets that incorporates a solid-in-liquid droplet architecture. This unique droplet structure allowed us to reduce, as well as tune the vaporization temperatures of perfluoropentane, and investigate the on-demand manipulation of the internal solid structure using acoustic waves. First, liquid droplet vaporization was probed by introducing solid-in-liquid endoskeletal droplets. Different types of endoskeletal droplets, such as fluorocarbon-in-fluorocarbon and hydrocarbon-in-fluorocarbon droplets, were generated and their vaporization behavior was investigated. A previously unused approach to control the vaporization behavior was described where the melting of the solid endoskeleton, that can blend into the liquid moiety, either enhances or disrupts the cohesive intermolecular forces. Fluorocarbon skeleton inhibits vaporization whereas hydrocarbon skeleton triggers vaporization near the rotator melting transition. Sub-spinodal vaporization as well as tunability in the vaporization temperature of perfluoropentane droplets was achieved by using this phenomenon of interfacial melting. Second, a microfluidic technique was developed and introduced to generated hydrocarbon in fluorocarbon endoskeletal droplets. Interestingly, various morphologies of these complex droplets could be generated, such as endoskeletal, exoskeletal and Janus type, using the same setup simply by changing the type of surfactant. Vaporization behavior of endoskeletal droplets with eicosane and heneicosane cores with perfluoropentane liquid, especially the effects of heat treatment and core size, was investigated. Results indicated the vaporization temperature as well as the vaporization ability of the droplets were governed by the size of the interfacial area between the hydrocarbon and the fluorocarbon. Better understanding of these interfacial behaviors that lead to vaporization can potentially pave the way to achieving on-demand and fine-tuned vaporization behavior of fluorocarbons. Finally, microfluidic technique to generate fluorocarbon-in-fluorocarbon endoskeletal droplets was developed and introduced. The dynamics of generated disk-in-sphere droplets within standing acoustic wave field was investigated and the physical mechanisms that govern their aggregation and self-assembly were explored. A new phenomenon was discovered in which the droplets attracted to form clusters, but the internal disks repelled to orient orthogonally to the cluster centroid. Analysis of the acoustic interactions indicated that these assembly dynamics arose from a balance of the primary and secondary radiation forces. Additionally, the disk orientation was found to change with acoustic driving frequency, which allowed on-demand, reversible switching between parallel and orthogonal disk orientations with respect to the substrate.

ISBN: 9798762105873Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Acoustic assembly

Synthesis and Characterization of Novel Perfluorocarbon Endoskeletal Droplets.
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300 $a 138 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-07, Section: B.
500 $a Advisor: Borden, Mark.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a Droplet emulsions have demonstrated unique capabilities in various sensing and imaging applications. In this report, we introduce a novel complex droplet called "Endoskeletal" droplets that incorporates a solid-in-liquid droplet architecture. This unique droplet structure allowed us to reduce, as well as tune the vaporization temperatures of perfluoropentane, and investigate the on-demand manipulation of the internal solid structure using acoustic waves. First, liquid droplet vaporization was probed by introducing solid-in-liquid endoskeletal droplets. Different types of endoskeletal droplets, such as fluorocarbon-in-fluorocarbon and hydrocarbon-in-fluorocarbon droplets, were generated and their vaporization behavior was investigated. A previously unused approach to control the vaporization behavior was described where the melting of the solid endoskeleton, that can blend into the liquid moiety, either enhances or disrupts the cohesive intermolecular forces. Fluorocarbon skeleton inhibits vaporization whereas hydrocarbon skeleton triggers vaporization near the rotator melting transition. Sub-spinodal vaporization as well as tunability in the vaporization temperature of perfluoropentane droplets was achieved by using this phenomenon of interfacial melting. Second, a microfluidic technique was developed and introduced to generated hydrocarbon in fluorocarbon endoskeletal droplets. Interestingly, various morphologies of these complex droplets could be generated, such as endoskeletal, exoskeletal and Janus type, using the same setup simply by changing the type of surfactant. Vaporization behavior of endoskeletal droplets with eicosane and heneicosane cores with perfluoropentane liquid, especially the effects of heat treatment and core size, was investigated. Results indicated the vaporization temperature as well as the vaporization ability of the droplets were governed by the size of the interfacial area between the hydrocarbon and the fluorocarbon. Better understanding of these interfacial behaviors that lead to vaporization can potentially pave the way to achieving on-demand and fine-tuned vaporization behavior of fluorocarbons. Finally, microfluidic technique to generate fluorocarbon-in-fluorocarbon endoskeletal droplets was developed and introduced. The dynamics of generated disk-in-sphere droplets within standing acoustic wave field was investigated and the physical mechanisms that govern their aggregation and self-assembly were explored. A new phenomenon was discovered in which the droplets attracted to form clusters, but the internal disks repelled to orient orthogonally to the cluster centroid. Analysis of the acoustic interactions indicated that these assembly dynamics arose from a balance of the primary and secondary radiation forces. Additionally, the disk orientation was found to change with acoustic driving frequency, which allowed on-demand, reversible switching between parallel and orthogonal disk orientations with respect to the substrate.
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653 $a Droplet microfluidics
653 $a Droplet vaporization
653 $a Emulsions
653 $a Surface acoustic waves
653 $a Ultrasound imaging
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