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Investigating escape of low MW siloxanes from PDMS matrix in aqueous solution

Author(s)
Cochran, Alicia (Alicia M.)
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Alternative title
Investigating escape of low molecular weight siloxanes from polydimethylsiloxane matrix in aqueous solution
Other Contributors
Massachusetts Institute of Technology. Department of Materials Science and Engineering.
Advisor
Michael Cima.
Terms of use
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
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Abstract
Knowledge of the oxygen levels in a tumor is a current goal of cancer research due to the importance of hypoxia on tumor growth and treatment. Previous work by the Cima group at MIT has shown that an oxygen sensor made from low molecular weight siloxanes (LMWS) in a PDMS matrix can be implanted during a biopsy and effectively measure oxygen levels in rat tumors with MRI. The Cima group also found that the sensors experienced signal loss over time when stored in air. The purpose of this investigation was to explore the loss of signal over time of the sensor when stored in aqueous solution. The signal reduction over time in environments similar to the body could be approximated by measuring the spin-lattice relaxation times of the sensor in various aqueous solutions. It was hypothesized that diffusion of the LMWS from the sensor to the surrounding environment was the potential cause of the signal loss over time, so the amount of LMWS that escaped into aqueous solution was investigated.
Description
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2013.
 
Cataloged from PDF version of thesis.
 
Includes bibliographical references (p. 22).
 
Date issued
2013
URI
http://hdl.handle.net/1721.1/81140
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Publisher
Massachusetts Institute of Technology
Keywords
Materials Science and Engineering.

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