University of Illinois Urbana-Champaign

Droplet manipulation on structured shape memory polymer surface

Park, Jun Kyu

Content Files
PARK-THESIS-2017.pdf

Permalink

https://hdl.handle.net/2142/97459

Description

Title
Droplet manipulation on structured shape memory polymer surface
Author(s)
Park, Jun Kyu
Issue Date
2017-04-28
Director of Research (if dissertation) or Advisor (if thesis)
Kim, Seok
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2017-08-10T19:16:01Z
Keyword(s)
  • Droplet manipulation
  • Shape memory polymer
  • Superhydrophobic
Abstract
While methods for dynamic tuning of surface wettability to manipulate water droplets have been widely explored for many applications including digital microfluidics, those based on dynamically changeable surface morphology have remained challenging to achieve. In this work, we present a structured shape memory polymer (SMP) surface which shows dynamically tunable surface wettability through changeable surface morphology in order to manipulate water droplets. The structured SMP surface involves a SMP pillar array consisting of nanotextured small and large pillars which can change its morphology between permanent and temporary shapes upon thermomechanical loading. Specifically, the structured SMP surface dynamically creates a surface morphological gradient and changes its surface wettability during thermally induced shape recovery of the SMP pillar array. Different wetting characteristics of the structured SMP surface between permanent and temporary shapes are theoretically predicted and experimentally verified. Based on these measured wetting characteristics, the structured SMP surface is designed to demonstrate that the morphological difference between two shapes under a water droplet overcomes contact angle hysteresis, resulting in driving a water droplet, when combined with the thermal Marangoni effect.
Graduation Semester
2017-05
Type of Resource
text
Permalink
http://hdl.handle.net/2142/97459
Copyright and License Information
Copyright 2017 Jun Kyu Park

Owning Collections

Graduate Dissertations and Theses at Illinois PRIMARY
Graduate Theses and Dissertations at Illinois
Dissertations and Theses - Mechanical Science and Engineering