Centrifugal casting and fast curing of polydimethylsiloxane (PDMS) for the manufacture of micro and nano featured components

The thermosetting resin polydimethylsiloxane (PDMS) is commonly used to prototype micro and nano featured components. In the field of microfluidics, PDMS-based devices have been used for cell sorting, cell culturing, microbioreactors, DNA sequencing, and immunoassays. In energy-related applications, PDMS has been used in fuel cell assemblies and as a material for transferring carbon nanotubes in the construction of solar cells. In addition, PDMS is the fundamental material of soft lithography and microcontact printing. Given the widespread use of PDMS in micro/nano technology, biology, and chemistry, the motivation of this thesis is to outline a viable manufacturing process for thermosetting resins such as PDMS that could be scaled-up for the large-scale production of micro/nano featured components. With respect to rate of PDMS device production, the two time-limiting steps in the typical prototyping process are degassing (bubble removal) and curing. To improve the degassing step, a novel centrifugal casting method is introduced, which permits simultaneous patterning of multiple surfaces and precise thickness control of a PDMS part. To improve the curing step, a custom-designed thermal management system heats and cools the PDMS. In centrifugal casting, the spinning time required to produce a bubble-free part is dependent on a distribution of critical bubble sizes, the centrifuge's spin speed profile, geometry, and fluid properties. A physical model predicting the spin time for bubble removal is verified by high speed video imaging and the production of bubble-free parts.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2009

Author dc:creator

• Mazzeo, Aaron D. (Aaron David), 1979-

Advisor dc:contributor.advisor

• David E. Hardt.

• Mechanical Engineering.

Statement dc:rights

• 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.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/54660

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/54660