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Title:Diffusion of Prodan on Self -Assembled Monolayers and Grafted Polymer Layers
Author(s):Heitzman, Carla Ellen
Doctoral Committee Chair(s):Paul Braun
Department / Program:Materials Science and Engineering
Discipline:Materials Science and Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Materials Science
Abstract:Two grafted polymer layers were synthesized, for diffusion studies, with surface-initiated polymerization (SIP). The results suggest that there is very little bulk translational diffusion in first layer, poly (N-isopropylacrylamide) (PNIPAM). Rather, fluorescence recovery is thought to be due to either rotational diffusion or a combination of fast surface diffusion and slow bulk diffusion. Increasing relative humidity enhanced recovery. FRAP results for prodan on the second grafted layer, poly (oligoethylene glycol acrylatmide) (POEGA) indicate that there is indeed bulk diffusion; D is calculated to be ∼1--3 x 10-8 cm2/s. Directed diffusion is accomplished by patterning lines on a sample with reactive ion etching (RIE). This method greatly reduces recovery due to surface diffusion, but rotational diffusion still occurs. Increasing relative humidity or ethanol vapor increased the recovery rate.
Issue Date:2005
Description:217 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005.
Other Identifier(s):(MiAaPQ)AAI3182276
Date Available in IDEALS:2015-09-25
Date Deposited:2005

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