Diffusion of Prodan on Self -Assembled Monolayers and Grafted Polymer Layers

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Materials Science and Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Heitzman, Carla Ellen

Contributors dc:contributor

• Paul Braun

• Engineering, Materials Science

Language dc:language

eng

Identifier

(MiAaPQ)AAI3182276

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/82762