• norsk
    • English
  • English 
    • norsk
    • English
  • Login
View Item 
  •   Home
  • Faculty of Mathematics and Natural Sciences
  • Department of Physics and Technology
  • Department of Physics and Technology
  • View Item
  •   Home
  • Faculty of Mathematics and Natural Sciences
  • Department of Physics and Technology
  • Department of Physics and Technology
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Altering the wetting properties of FEP films by nano-structuring the surface using reactive ion etching

Frøvik, Nikolai
Master thesis
Thumbnail
View/Open
master thesis (23.04Mb)
URI
https://hdl.handle.net/1956/16771
Date
2017-10-18
Metadata
Show full item record
Collections
  • Department of Physics and Technology [1814]
Abstract
Renewable energy sources has become a large field of research, and in the recent years, methods to harvest energy from rain drops have been developed. This technology is based on rain drops rolling or sliding on a polymer surface. Thus, the behavior of drops on such polymer surfaces are of interest. In this thesis work, the surface of fluorinated ethylene propylene (FEP) has been modified by creating nano-structures using reactive ion etching (RIE). Different etch parameters resulted in nano-structures with shapes like granules, hairs and holes. The granules and hairs had a diameter of approximately 100 nm, and the tallest hairs were about 500 - 600 nm tall. The highest measured aspect ratio of hairlike structures were about 5 (height/width). In order to accurately measure the wetting properties of the nano-structured FEP, a suitable measurement method had to be chosen and optimized. Experiments with a tilted plate enabled reproducible results for the nano-structured FEP of advancing contact angle (ACA), receding contact angle (RCA) and the roll off angle (ROA), i.e. when the drop starts to roll or slide off the sample. By the ROA, the adhesive force between the drop and the surface of the sample could be calculated. An alternative method to estimate the adhesive force using measurements of ACA and RCA has been found to give comparable results to the method using the ROA. Generation of nano-structures altered the wetting properties of FEP significantly. The ACA increased from 118 ± 2◦ to 144 ± 5◦ at the most, and the RCA decreased from 102 ± 2◦ to about 20◦ for FEP treated by different RIE processes. Drop-surface adhesion increased from 110 ± 10 µN for untreated FEP, to 620 ± 30 µN at most for hairlike nano-structures.
Description
Postponed access: the file will be accessible after 2019-10-02
Publisher
The University of Bergen
Copyright
Copyright the Author. All rights reserved

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit
 

 

Browse

ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDocument TypesJournalsThis CollectionBy Issue DateAuthorsTitlesSubjectsDocument TypesJournals

My Account

Login

Statistics

View Usage Statistics

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit