2026-09-18T19:47:44Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/362902022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Todd Thorsen.
Rhodes, Christopher R. (Christopher Randolph)
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2007-02-21T13:22:36Z
2007-02-21T13:22:36Z
2006
2006
http://hdl.handle.net/1721.1/36290
77553727
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.
Includes bibliographical references (p. 52-53).
Polymer nanofibers hold much promise as advanced composite materials, and can be customized into matrices with special electrical, optical and biological properties. Electrospinning, which utilizes the destabilization of a fluid's surface in a strong electric field, has gained the most favor as a top-down approach to producing polymer nanofibers. In this work, a microfluidic device was designed and assembled for the two-dimensional focusing of immiscible fluids and integrated into a system for electrospinning. Hollow fibers were produced with diameters on the order of 100-240 nm, at steady-state flow rates around 50 pL/min. TEM images show hollow interiors with diameters approximately one third of the total fiber diameter. These results are important for future efforts at multiplexing the electrospinning process, and prove that the creation of hollow fibers is feasible using a microfabricated device. Furthermore, the focusing of immiscible streams in two dimensions may be used for sample transport and reaction control in microfluidics. Suggestions are made for further evaluation of flow focusing behavior, and improvements that may increase the viability of electrospinning as an industrial process.
by Christopher R. Rhodes.
S.B.
53 p.
eng
Massachusetts Institute of Technology
M.I.T. 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. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Microfluidic flow-focusing device for the electrospinning of hollow polymer nanofibers
Thesis
application/pdf
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unknown
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<Abstract>Polymer nanofibers hold much promise as advanced composite materials, and can be customized into matrices with special electrical, optical and biological properties. Electrospinning, which utilizes the destabilization of a fluid's surface in a strong electric field, has gained the most favor as a top-down approach to producing polymer nanofibers. In this work, a microfluidic device was designed and assembled for the two-dimensional focusing of immiscible fluids and integrated into a system for electrospinning. Hollow fibers were produced with diameters on the order of 100-240 nm, at steady-state flow rates around 50 pL/min. TEM images show hollow interiors with diameters approximately one third of the total fiber diameter. These results are important for future efforts at multiplexing the electrospinning process, and prove that the creation of hollow fibers is feasible using a microfabricated device. Furthermore, the focusing of immiscible streams in two dimensions may be used for sample transport and reaction control in microfluidics. Suggestions are made for further evaluation of flow focusing behavior, and improvements that may increase the viability of electrospinning as an industrial process.</Abstract>
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