Diffusion of Prodan on Self -Assembled Monolayers and Grafted Polymer Layers
Heitzman, Carla Ellen
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https://hdl.handle.net/2142/82762
Description
Title
Diffusion of Prodan on Self -Assembled Monolayers and Grafted Polymer Layers
Author(s)
Heitzman, Carla Ellen
Issue Date
2005
Doctoral Committee Chair(s)
Paul Braun
Department of Study
Materials Science and Engineering
Discipline
Materials Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
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.
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